Showing papers by "Jian Jin published in 2016"
TL;DR: A PAAS-g-PVDF-coated copper mesh can effectively separate a crude oil/water mixture with extremely high flux and high oil rejection driven by gravity, and is oil-fouling-free for long-term use.
Abstract: A polyionized hydrogel polymer (sodium polyacrylate-grafted poly(vinylidene fluoride) (PAAS-g-PVDF)) is fabricated via an alkaline-induced phase-inversion process. PAAS-g-PVDF coatings exhibit unprecedented anti-adhesion and self-cleaning properties to crude oils under an aqueous environment. A PAAS-g-PVDF-coated copper mesh can effectively separate a crude oil/water mixture with extremely high flux and high oil rejection driven by gravity, and is oil-fouling-free for long-term use.
321 citations
TL;DR: The overall separation performance of the designed MOF/PI mixed matrix membranes surpasses the state-of-the-art 2008 Robeson upper bound for the H2 /CH4 and H1 /N2 gas pairs and approaches the 2008 upper bound.
Abstract: High-performance metal-organic framework (MOF)/polyimide (PI) mixed matrix membranes (MMMs) are fabricated by a facile strategy by designing the MOF/PI matrix interface via poly dopamine coating. The overall separation performance of the designed MMMs surpasses the state-of-the-art 2008 Robeson upper bound for the H2 /CH4 and H2 /N2 gas pairs and approaches the 2008 upper bound for the O2 /N2 gas pair.
312 citations
TL;DR: A new avenue is reported in this work to design NF membrane by using polydopamine wrapped single-walled carbon nanotube (PD/SWCNTs) ultrathin film as support layer instead of the use of traditional polymer-based underlying layers to achieve a defect-free polyamide selective layer.
Abstract: Fabricating nanofiltration (NF) membranes with high permeating flux and simultaneous high rejection rate for desalination is rather significant and highly desired. A new avenue is reported in this work to design NF membrane by using polydopamine wrapped single-walled carbon nanotube (PD/SWCNTs) ultrathin film as support layer instead of the use of traditional polymer-based underlying layers. Thanks to the high porosity, smooth surface, and more importantly optimal hydrophilic surface of PD/SWCNTs film, a defect-free polyamide selective layer for NF membrane with thickness of as thin as 12 nm is achieved. The obtained NF membrane exhibits an extremely high performance with a permeating flux of 32 L m-2 h-1 bar-1 and a rejection rate of 95.9% to divalent ions. This value is two to five times higher than the traditional NF membranes with similar rejection rate.
283 citations
TL;DR: In this paper, an alkaline-induced phase inversion process is developed for the superhydrophilic/underwater superoleophobic polyacrylonitrile (PAN) ultrafiltration membrane.
153 citations
TL;DR: In this article, a composite separator that contains a conductive few-layered Ti3C2 nanosheet and a glass fiber membrane for lithium-sulfur (Li-S) batteries is presented.
Abstract: We report in this work a new type composite separator that contains a conductive few-layered Ti3C2 nanosheet and a glass fiber (GF) membrane for lithium–sulfur (Li–S) batteries. Using commercial bulk S (particle size 2–10 μm) as the cathode directly, the Li–S battery delivers an initial discharge capacity of 820 mA h g−1 at a current density of 0.5 A g−1 and a discharge capacity of 721 mA h g−1 after 100 cycles.
118 citations
TL;DR: In this paper, two composite membranes with in-air hydrophilic and underwater oleophobic surfaces, one of positive charge and the other of negative charge, were fabricated by modifying a hydrophobic polyvinylidene fluoride (PVDF) membrane with polyelectrolytes with different charges.
118 citations
TL;DR: In this article, a noble-metal-free Co(OH)2/CdS nanowires (NWs) were developed for photocatalytic hydrogen production.
Abstract: Through a facile impregnation synthesis, new noble-metal-free Co(OH)2/CdS nanowires (NWs) have been developed for photocatalytic hydrogen production. The loading of Co(OH)2 on CdS NWs can effectively accelerate the charge separation and transfer in photocatalytic reactions, leading to an enhanced H2 production rate (HPR). The optimum HPR based on Co(OH)2/CdS reaches 14.43 mmol h−1 g−1 under visible light (λ ≥ 420 nm) irradiation, which is 206 times higher than for the pristine CdS NWs and even 3 times higher than for 1 wt% Pt/CdS NWs as a benchmark. Impressively, core–shell structural Co(OH)2/CdS NWs formed by visible-light-induced self-assembly during the photocatalytic reaction. And the core–shell structural characteristics of the Co(OH)2/CdS NWs can effectively avoid light corrosion, leading to a stable HPR in 12 hours duration.
108 citations
TL;DR: It is indicated that soil pH was a main factor structuring acidobacterial communities in the black soil zone of northeast China and the Acidobacteria-specific primers could be better used for studying the distribution of acidobacteria communities in soils.
Abstract: Although Acidobacteria are ubiquitous and are commonly one of the most abundant bacterial phyla in soils, knowledge regarding their diversity and distribution is still limited. Our previous studies discovered the biogeographical distribution patterns of bacterial and fungal communities in the black soil zone of northeast China. In this study, we further investigated the diversity and composition of acidobacterial communities generated with the Acidobacteria-specific primers ACIDO/342r in the same soil samples using quantitative PCR and Illumina MiSeq sequencing methods. A total of 412,203 acidobacterial 16S rRNA gene sequences were obtained from 26 soil samples that were collected from arable lands across the black soil zone. These sequences belonged to 21 subgroups, and GP1, GP3, GP4 and GP6 were the most abundant subgroups, accounting for 22.63%, 17.17%, 23.82% and 27.47% of acidobacterial sequences across all soils, respectively. The abundance of Acidobacteria displayed a more significant positive correlation with soil carbon content than with soil pH, and the relative abundance of certain subgroups was significantly positive or negative related with soil pH. The OTU richness, phylogenetic diversity and community composition of Acidobacteria were significantly correlated with soil pH. A variance partitioning analysis showed that the soil pH contributed 25% of the community variation, while the geographic distance explained only approximately 5% of the variation. These results indicated that soil pH was a main factor structuring acidobacterial communities in the black soil zone of northeast China. Our results also suggested that the Acidobacteria-specific primers could be better used for studying the distribution of acidobacterial communities in soils.
81 citations
TL;DR: This study revealed, for the first time, the abundance of microorganisms on the genus level being affected by eCO2 in the soybean-planted Mollisol, which may be associated with soil nutrient cycling and plant productivity.
42 citations
TL;DR: In this paper, a 150-day incubation experiment was conducted with different 13C-labelled residues of soybean, i.e., leaf, stalk, and root, incorporated into a Mollisol.
Abstract: Understanding the decomposition processes of crop residues and the quantity of residue carbon (C) incorporated into soil organic C (SOC) pools in the soil is crucial for optimizing C management in agricultural systems. This study is highly valuable in Mollisols in northeastern China, where SOC is markedly decreasing. Soybean is a major crop in this region; however, the decomposition processes of soybean residues and their contributions to physically separated SOC pools remain unknown. Thus, a 150-day incubation experiment was conducted with different 13C-labelled residues of soybean, i.e., leaf, stalk, and root, incorporated into a Mollisol. The leaves had the highest decomposition rate. At the end of the incubation, cumulative respiration reached 7.76 mg CO2-C g−1 in the leaf-incorporated soil, but only 5.98 and 5.51 mg CO2-C g−1 was recorded for the stalk- and root-amended soils. Furthermore, similar trends were found for the microbial biomass C and dissolved organic C. Different residue sources greatly affected the residue-derived C incorporation in the SOC fractions, resulting in a ranking of root > stalk > leaf. The root-derived C incorporation values were 49.5, 17.2, and 5.0 g residue C kg−1 in the coarse particulate organic C (POC), fine POC, and mineral-associated C (MOC) fractions, respectively, which were significantly higher than those for the stalk- and leaf-derived C. These results indicate that C input from roots can play an important role in C stability in this Mollisol by incorporating more C in the POC and MOC.
41 citations
TL;DR: The presence of nitrate appears to inhibit nodulation via multiple pathways, including changes to flavonoid metabolism, defense responses and redox changes.
Abstract: The presence of nitrogen inhibits legume nodule formation, but the mechanism of this inhibition is poorly understood. We found that 2.5 mM nitrate and above significantly inhibited nodule initiation but not root hair curling in Medicago trunatula. We analyzed protein abundance in M. truncatula roots after treatment with either 0 or 2.5 mM nitrate in the presence or absence of its symbiont Sinorhizobium meliloti after 1, 2 and 5 days following inoculation. Two-dimensional gel electrophoresis combined with mass spectrometry was used to identify 106 differentially accumulated proteins responding to nitrate addition, inoculation or time point. While flavonoid-related proteins were less abundant in the presence of nitrate, addition of Nod gene-inducing flavonoids to the Sinorhizobium culture did not rescue nodulation. Accumulation of auxin in response to rhizobia, which is also controlled by flavonoids, still occurred in the presence of nitrate, but did not localize to a nodule initiation site. Several of the changes included defense- and redox-related proteins, and visualization of reactive oxygen species indicated that their induction in root hairs following Sinorhizobium inoculation was inhibited by nitrate. In summary, the presence of nitrate appears to inhibit nodulation via multiple pathways, including changes to flavonoid metabolism, defense responses and redox changes.
TL;DR: A high performance oxygen-rich three-phase enzyme electrode based on superhydrophobic mesoporous silicon nanowire arrays for glucose detection with linear detection upper limit is 30 mM, more than 15 times higher than that can be obtained on the normal enzyme-electrode.
Abstract: We describe here a high performance oxygen-rich three-phase enzyme electrode based on superhydrophobic mesoporous silicon nanowire arrays for glucose detection. We demonstrate that its linear detection upper limit is 30 mM, more than 15 times higher than that can be obtained on the normal enzyme-electrode. Notably, the three-phase enzyme electrode output is insensitive to the significant oxygen level fluctuation in analyte solution.
TL;DR: The fabrication of a thermoresponsive composite ultrathin membrane with precisely controlled nanopores for high-throughput separation and could be applied to effectively separate materials with very small size differences through size sieving.
Abstract: With the growing demand for small- and large-scale bioprocesses, advanced membranes with high energy efficiency are highly required. However, conventional polymer-based membranes often have to sacrifice selectivity for permeability. In this work, we report the fabrication of a thermoresponsive composite ultrathin membrane with precisely controlled nanopores for high-throughput separation. The composite membrane is made by grafting a PEG analogue thermoresponsive copolymer onto an ultrathin single-wall carbon nanotubes (SWCNTs) membrane via π–π interaction with no use of the common “grafting from” synthesis approach. The composite membrane exhibits ultrahigh water permeation flux as high as 6430 L m–2 h–1 at 40 °C, and more importantly, the pore size of the membrane could be finely adjusted by utilizing the thermoresponsive property of the grafted copolymer. With the temperature changing below and above the lower critical solution temperature (LCST) of the copolymer, the effective pore size of the membrane...
TL;DR: In this paper, a novel barrier layer material, nonstoichiometric W18O49 nanowires, is reported to alleviate the undesirable polysulfide shuttle effect, thereby boosting the specific capacity and cyclability of Li-S batteries.
Abstract: Li–S batteries are regarded as one of the most promising energy-storage devices due to their high theoretical energy density, five times higher than that of lithium-ion batteries (2600 vs. ∼500 W h kg−1). However, the polysulfide shuttle effect is the primary challenge for future applications of Li–S batteries. Herein, a novel barrier layer material, nonstoichiometric W18O49 nanowires, is reported to alleviate the undesirable shuttle effect, thereby largely boosting the specific capacity and cyclability of Li–S batteries. Without particular cathode design, the introduction of W18O49 nanowires enables the commercially available micro-sized sulfur cathode with 70% sulfur loading to deliver a respectable initial discharge capacity of 1142 mA h g−1 and retain a specific capacity of about 809 mA h g−1 after 50 cycles, even at a current density of 0.5 A g−1. To the best of our knowledge, such a capacity fading for Li–S batteries based on high loading of commercial micro-sized sulfur has been rarely reported.
TL;DR: Non-metric multidimensional scaling analysis indicated that phage phoH assemblages in paddy waters were distinct from those in marine waters, suggesting the phage community in piant fields is biogeographically distributed.
Abstract: Although bacteriophages are ubiquitous in various environments, their genetic diversity is primarily investigated in pelagic marine environments. Corresponding studies in terrestrial environments are few. In this study, we conducted the first survey of phage diversity in the paddy ecosystem by targeting a new viral biomarker gene, phoH. A total of 424 phoH sequences were obtained from four paddy waters generated from a pot experiment with different soils collected from open paddy fields in northeast China. The majority of phoH sequences in paddy waters were novel, with the highest identity of ≤70% with known phoH sequences. Four unique groups (Group α, Group β, Group γ and Group δ) and seven new subgroups (Group 2b, Group 3d, Group 3e, Group 6a, Group 6b, Group 6c and Group 6d) were formed exclusively with the clones from the paddy waters, suggesting novel phage phoH groups exist in the paddy ecosystem. Additionally, the distribution proportions of phoH clones in different groups varied among paddy water samples, suggesting the phage community in paddy fields is biogeographically distributed. Furthermore, non-metric multidimensional scaling analysis indicated that phage phoH assemblages in paddy waters were distinct from those in marine waters.
TL;DR: In this article, single-walled carbon nanotubes (SWNTs) are post-treated by argon (Ar) or ammonia (NH 3 ) plasma irradiation to introduce defects that are potentially related to catalysis towards the oxygen reduction reaction (ORR).
TL;DR: A 2D soft template-directed fabrication for ultrathin polyacrylamide nanosheets with a thickness as low as 3.5 nm and large dimensions is reported, resulting in well aligned polymer chains that are well aligned with a clear interchain spacing.
Abstract: The orientation and state of organization of polymer chains play significant roles in determining the final properties and functions of these materials. Unlike most semicrystalline polymers, which have an inherent driving force toward crystallization, the means to control chain packing in noncrystallizable polymers is still restricted and remains a challenge. We report herein a 2D soft template-directed fabrication for ultrathin polyacrylamide nanosheets with a thickness as low as 3.5 nm and large dimensions (>20 μm). More importantly, the polymer chains in the nanosheets produced are well aligned with a clear interchain spacing. The formation of polymer nanosheets with ordered chain alignment was performed in a special solution containing a periodic sandwich structure of lamellar bilayer membranes and water layers that are hundreds of nanometers thick. It functions as a 2D orientation template to align the monomers in an orderly manner along the in-plane direction of the bimolecular membrane via hydrogen...
TL;DR: The obtained PPy nanosheets exhibit regioregularity with ordered chain alignment where the polymer chains in the nanosheeets produced are well aligned with a clear interchain spacing as confirmed by small-angle X-ray scattering measurement.
Abstract: Herein, the use of a 2D soft template system composed of hundred-nanometer-thick water/ethanol mixed layers sandwiched by lamellar bilayer membranes of a self-assembled amphiphilic molecule to produce ultrathin polyprrole (PPy) with a uniform thickness as thin as 3.8 nm and with large dimensions (>2 μm(2)) is presented. The obtained PPy nanosheets exhibit regioregularity with ordered chain alignment where the polymer chains in the nanosheets produced are well aligned with a clear interchain spacing as confirmed by small-angle X-ray scattering measurement. The molecular-level-thick PPy nanosheets exhibit extremely high conductivity up to 1330 S m(-1), thanks to the ordered alignment of polymer chains in the nanosheets, and a high transparency in both the visible region (transmittance >99%) and near-infrared region (transmittance >93%).
TL;DR: Comparison of the g23 clone assemblages from different environments demonstrated that T4-type phages were biogeographically distributed, and the distribution was both affected by geographical separation and ecological processes across the biomes.
Abstract: Our previous study revealed the high diversity of the major capsid gene (g23) of T4-type phages that existed in the paddy field soils in Northeast China. In this study, the phylogeny and genetic diversity of the g23 gene in the paddy floodwater samples collected from five sampling sites at three sampling times during the rice (Oryza sativa L.) growth season in Northeast China are reported. In total, 104 different g23 clones were isolated, among which 50% of the clones exhibited the highest identities with the clones retrieved in paddy soils and upland black soils. The remaining clones had the highest identities with lake origins. Phylogenetic analysis revealed that 43% of the g23 clones grouped into three novel subgroups which included the clones unique to paddy floodwater, and no g23 sequences obtained in paddy floodwater fell into the paddy soil groups II, III, IV, V, VI, VII and NPC-A. UniFrac analysis of g23 clone assemblages demonstrated that T4-type phage communities in paddy floodwater were...
TL;DR: Investigation of the origin of plant N under two different levels of N application and the subsequent influence on C assimilation indicates that a greater contribution of N2 fixation to N assimilation during the seed-filling period is likely to meet N demand for maintaining soybean yield when fertiliser N supply is reduced.
Abstract: Excessive fertiliser has been commonly applied in the soybean (Glycine max (L.) Merr.) cropping system in fertile Mollisols in Northeast China. However, it is necessary to understand how reducing nitrogen (N) fertiliser application may affect plant N acquisition and remobilisation, which is associated with photosynthetic carbon (C) assimilation and seed yield. The aim of this study was to investigate the origin of plant N (i.e. derived from N2 fixation, fertiliser or soil) under two different levels of N application, and the subsequent influence on C assimilation. A pot experiment was conducted with soybean grown in a Mollisol supplied with 5 mg N kg–1 soil (N5) or 100 mg N kg–1 soil (N100). Nitrogen was applied as 19.83% of 15N atom-excess in urea before sowing, and 13CO2 labelling was performed at the R5 (initial seed-filling) stage. Plants were harvested at R5 and full maturity stages to determine the 15N and 13C abundance in plant tissues. Seed yield and N content were not affected by different N rates. Symbiotically fixed N accounted for 64% of seed N in treatment N5, whereas fertiliser-derived N dominated seed N in N100, resulting in 58% of seed N. The proportion of soil-derived N in shoot and seed showed no difference between the two N treatments. A similar trend was observed for whole-plant N. The enhanced N2 fixation in N5 significantly increased assimilation of N and C during the seed-filling period compared with N100. Nodule density (nodule number per unit root length) and amount of photosynthetically fixed 13C in roots in N5 were greater than in N100. These results indicate that a greater contribution of N2 fixation to N assimilation during the seed-filling period is likely to meet N demand for maintaining soybean yield when fertiliser N supply is reduced. Greater allocation of photosynthetic C to roots and enhanced nodulation would greatly contribute to the alteration of N acquisition pattern under such condition.
TL;DR: The AOB clone frequency differed between the growing and non-growing seasons, possibly because the AOB communities were favoured by warm, moist soil conditions or the active plant rhizosphere during the growing season.
TL;DR: It was found that the majority of psbA clones from paddy waters of both countries fell into the subcluster α-2, suggesting that the distribution of cyanophage PsbA genes in paddy Waters is narrow, butfar away from those from environmental freshwater and seawater.
TL;DR: Non-metric multidimensional scaling analysis indicated that the cyanopodovirus communities in paddy waters were similar to those in lake freshwater but distinct from the communities in marine and coastal waters.
22 Jan 2016
TL;DR: The results showed that the detective level of 13C-DNA could be reduced to 2 atom% 13C of glucose, while the ideal level was 10 atom% 12 C glucose, which provides a new reference of DNA-SIP in order to be detective.
Abstract: In the stable-isotope probing (SIP) technology, the 13C-labelled substrate is normally used to incorporate 13C into nucleic acids A proper abundance of 13 C in substrate is critical to the success of SIP, because the 13 C level not only determines whether 13 C in nucleic acids is sufficient to be detective, but also affects the enrichment bias in the labeled microbes However, such information is very rare In this study, a serial of 13 C-labelled glucose from 0 to 50 atom% 13 C was used to incubate with Escherichia coli and then performed DNA-SIP Our results showed that the detective level of 13C-DNA could be reduced to 2 atom% 13C of glucose (130 atom% 13C in DNA extract), while the ideal level was 10 atom% 13 C glucose (225 atom% 13 C in DNA) The critical level of 13 C for the separation of 13 C-DNA provides a new reference of DNA-SIP in order to
Patent•
14 Dec 2016
TL;DR: In this paper, a device for collecting plant rhizosphere soil and a method for collecting rhizospheric soil by utilizing the device and relates to a device and a soil collection method, where a square hole is formed in the center of each PVC frosted plate, and the bottom of each plate is sealed by a nylon net; the two PVC frozen plates are laminated; the clamping device is arranged on the edge.
Abstract: The invention discloses a device for collecting plant rhizosphere soil and a method for collecting rhizosphere soil by utilizing the device and relates to a device for collecting soil and a soil collection method. The problems that the collected rhizosphere soil is often mixed with much non-rhizosphere soil and many fine plant roots are mixed with the soil when the rhizosphere soil is collected by the existing method are solved. The device comprises two PVC frosted plates and a clamping device, wherein a square hole is formed in the center of each PVC frosted plate; the bottom of each PVC frosted plate is sealed by a nylon net; the two PVC frosted plates are laminated; the clamping device is arranged on the edge. The method comprises the following steps: filling soil in a central hole of the soil collection device, and filling soil in a pot with pre-planted plants; placing the fixed device, covering the device with soil, seeding plant seeds, culturing the plant to a sampling period, and collecting the soil between the two PVC frosted plates, so as to obtain the rhizosphere soil. The device and the method are used for collecting the plant rhizosphere soil.