scispace - formally typeset
Journal ArticleDOI: 10.1016/J.BIORTECH.2021.124922

High mesoporosity phosphorus-containing biochar fabricated from Camellia oleifera shells: Impressive tetracycline adsorption performance and promotion of pyrophosphate-like surface functional groups (C-O-P bond)

02 Mar 2021-Bioresource Technology (Elsevier)-Vol. 329, pp 124922-124922
Abstract: In China, more than 3.5 million tons of Camellia oleifera discarded shells are produced every year. This work first prepared phosphorus-containing biochar (PBC) from C. oleifera shells and was successfully applied to the efficient removal of tetracycline (TC) from solutions. The prepared PBC exhibits superior TC adsorption capacity of 451.5 mg/g, and TC uptake rapidly reached 315.5 mg/g at the first 5 min (C0 = 50 mg/L). Furthermore, PBC also shows excellent applicability to the broad range pH value (1–9) and superior selective removal in the presence of various high concentration coexisting ions (1 mM). Mechanisms underlying TC adsorption were also put forward, and analysis suggested that pyrophosphate-like surface functional groups (C-O-P bond) played a critical role in this process. Notably, treating pharmaceutical wastewater with PBC can efficiently reduce chemical oxygen demand (COD) and total organic carbon (TOC) concentration below the discharge standard of China (GB21904-2008).

... read more

Topics: Camellia oleifera (53%), Adsorption (51%), Biochar (51%)
Citations
  More

8 results found


Journal ArticleDOI: 10.1016/J.SEPPUR.2021.119548
Mengbo Cao1, Xun Liu1, Wei Wang1, Ming Gao1  +2 moreInstitutions (1)
Abstract: The fast and efficient combustion technology was used to design zinc/alumina oxide N-doped carbon nanocomposites (Zn/Al-NCs) with assorted structures as pollutants adsorbent for capturing tetracycline (TC). XRD, SEM, TEM, EDX mapping, BET, and FTIR analysis techniques demonstrated the morphology and physicochemical properties of Zn/Al-NCs synthesized under mild conditions. The experimental results show that the pseudo-second-order kinetic and Langmuir model described the adsorption process well, indicating chemisorption and a monolayer adsorption nature. All Zn/Al-NCs exhibits excellent adsorption performance (>336 mg/g) to TC and the presence of humic acid (10 mg/L) made the adsorption capacity achieved a huge increasement (>446 mg/g) by forming a bridge bond. The adsorption mechanisms were pore-filling, electrostatic interactions, complexation, and H-bonds, confirming by BET, zeta potential, XPS, and FT-IR. The proposed synthesis strategy provides an efficient, excellent versatility, and time-saving way for preparing potential and high-performance materials for adsorbents.

... read more

Topics: Adsorption (61%), Langmuir adsorption model (56%), Chemisorption (52%) ... read more

1 Citations


Journal ArticleDOI: 10.1016/J.ENVRES.2021.112175
Xiaoyu Sheng1, Junkai Wang1, Quantao Cui1, Wei Zhang1  +1 moreInstitutions (2)
Abstract: The recovery of carbon materials from biogas residue (BR) could efficiently promote the efficient utilization of waste and the preparation of novel materials. In this study, a green and feasible reagent of citric acid was introduced and applied in the modification of biogas residue biochar (BRC). The modified biogas residue biochar (CABRC) showed a superior adsorption ability due to its higher specific surface area (approximately 6 times that of the BRC). Additionally, the adsorption capacities of CABRC and BRC for TC were 58.25 mg/g and 20.77 mg/g, respectively, while the TC adsorption performance of CABRC was 2.8 times that of BRC. The adsorption of TC by both BRC and CABRC was primarily controlled by physical adsorption and chemical adsorption (including pore filling, hydrogen bonding, π−π DEA interaction, and electrostatic interaction). Therefore, CABRC should be considered an environmentally friendly material due to its higher adsorption performance, which could expand its application in wastewater treatment.

... read more

Topics: Adsorption (57%), Biochar (54%), Biogas (50%)

1 Citations


Journal ArticleDOI: 10.1016/J.CHEMOSPHERE.2021.132031
Mengbo Cao1, Xun Liu1, Wei Wang1, Ming Gao1  +1 moreInstitutions (1)
01 Jan 2022-Chemosphere
Abstract: Herein, bifunctional two-dimensional copper-aluminum modified filter paper composite (2D-Cu/Al–C) was successfully prepared by simple calcination and showed ultrahigh adsorption performance and degradation potential. The adsorption removal of TC on 2D-Cu/Al–C all exceeded 92.2% under solution conditions of 10–200 mg/L TC, 100 mg/L 2D-Cu/Al–C, pH 8 and 298 K. The pseudo-second-order kinetic and Langmuir models better fitted the kinetic and isotherm data via spontaneous and exothermic process, and the maximum capacity of the 2D-Cu/Al–C was 2391.78 mg/g. Additionally, 2D-Cu/Al–C showed desired specific adsorption for TC (TC: 98.7%, norfloxacin: 5.8%, sulfamethoxazole: 2.1%, and ciprofloxacin: 1.8%) and it could effectively adsorbed TC even in the binary system (various coexisting ions or natural organic matter). After TC adsorbed on adsorbent was mineralized into CO2 and H2O by adding peroxydisulfate to generate high electrode potential radical in another limited systems, the 2D-Cu/Al–C still had ∼89.12% on TC removal (initial concentration of 50 mg/L) after five experimental cycles. Zeta potential, FT-IR and XPS results indicated that the multi-adsorption mechanism, including electrostatic interactions, complexation, and H-bonds, played a vital role in the fast and efficient adsorption process. Thus, the way of combining adsorption and regeneration via degradation are green, non-polluting strategy which are expected to be applied for water purification in future environmental remediation.

... read more

Topics: Adsorption (55%), Selective adsorption (53%), Langmuir (52%)

1 Citations


Journal ArticleDOI: 10.1016/J.BIORTECH.2021.126235
Huang Ruiyi1, Xiaohao Liu1, Fenglei Qi1, Liangyuan Jia1  +3 moreInstitutions (1)
Abstract: Manufacturing high-performance activated carbon (AC) materials from abundant biomass at low temperature and short activation time is targeted by the green and sustainable chemical industry. Here, a 1980 m2/g of carbon nanospheres-anchored porous carbon material (PHAC) derived from waste sawdust was prepared by a method of H3PO4 hydrothermal combined with fast activation at 450 °C within 2.8 minutes. It is found that H3PO4 hydrothermal pretreatment could promote the dehydration of carbohydrates to form more unstable C=O structures, which were decomposed in the subsequent fast activation to form pore structures. In addition, this process is also conducive to the formation of carbon nanospheres, increasing the degree of graphitization and producing more graphite defects. The prepared PHAC showed good adsorption performance for different types of pollutants. This work provides a new insight for the preparation of high performance biomass based carbon materials under mild conditions.

... read more

Topics: Carbon (60%), Activated carbon (55%), Graphite (53%) ... read more

Open accessJournal ArticleDOI: 10.1016/J.BIORTECH.2021.126268
Jindou Shi1, Caili Guo1, Changyang Lei1, Yanyan Liu1  +3 moreInstitutions (1)
Abstract: A high-performance biochar derived from the residue of Chaga mushroom (Inonotus obliquus) was reported in this study. Inonotus obliquus residues were used to prepare biochar, and the optimal synthesis conditions were obtained by response surface methodology. The specific surface area, pore volume, and average pore size of the optimal biochar (Zn-IORBC) was 1676.78 m2/g, 1.87 cm3/g, and 3.88 nm, respectively. Methylene blue (MB) and tetracycline (TC) were selected to estimate the adsorption performance of Zn-IORBC. The adsorption process was suitable for the pseudo-second-order model and Langmuir model. Zn-IORBC could maintained a large amount of TC adsorption (the lowest value was 686.20 mg/g in mountain spring water) in different natural water. The maximum adsorption capacity of TC and MB was 947.42 and 1033.66 mg/g. The adsorption mechanism was contributed to the electrostatic attraction, hydrogen bonding, π-π interactions, and pore-filling. Zn-IORBC is an effective adsorbent for high-performance pollutants removal.

... read more

Topics: Biochar (57%), Inonotus obliquus (55%), Adsorption (54%) ... read more

References
  More

43 results found


Journal ArticleDOI: 10.1515/PAC-2014-1117
Abstract: Gas adsorption is an important tool for the characterisation of porous solids and fine powders. Major advances in recent years have made it necessary to update the 1985 IUPAC manual on Reporting Physisorption Data for Gas/Solid Systems. The aims of the present document are to clarify and standardise the presentation, nomenclature and methodology associated with the application of physisorption for surface area assessment and pore size analysis and to draw attention to remaining problems in the interpretation of physisorption data.

... read more

6,984 Citations


Journal ArticleDOI: 10.1016/J.CHEMOSPHERE.2012.03.067
Ike van der Veen1, Jacob de Boer1Institutions (1)
01 Aug 2012-Chemosphere
Abstract: Since the ban on some brominated flame retardants (BFRs), phosphorus flame retardants (PFRs), which were responsible for 20% of the flame retardant (FR) consumption in 2006 in Europe, are often proposed as alternatives for BFRs. PFRs can be divided in three main groups, inorganic, organic and halogen containing PFRs. Most of the PFRs have a mechanism of action in the solid phase of burning materials (char formation), but some may also be active in the gas phase. Some PFRs are reactive FRs, which means they are chemically bound to a polymer, whereas others are additive and mixed into the polymer. The focus of this report is limited to the PFRs mentioned in the literature as potential substitutes for BFRs. The physico-chemical properties, applications and production volumes of PFRs are given. Non-halogenated PFRs are often used as plasticisers as well. Limited information is available on the occurrence of PFRs in the environment. For triphenyl phosphate (TPhP), tricresylphosphate (TCP), tris(2-chloroethyl)phosphate (TCEP), tris(chloropropyl)phosphate (TCPP), tris(1,3-dichloro-2-propyl)phosphate (TDCPP), and tetrekis(2-chlorethyl)dichloroisopentyldiphosphate (V6) a number of studies have been performed on their occurrence in air, water and sediment, but limited data were found on their occurrence in biota. Concentrations found for these PFRs in air were up to 47 μg m(-3), in sediment levels up to 24 mg kg(-1) were found, and in surface water concentrations up to 379 ng L(-1). In all these matrices TCPP was dominant. Concentrations found in dust were up to 67 mg kg(-1), with TDCPP being the dominant PFR. PFR concentrations reported were often higher than polybrominated diphenylether (PBDE) concentrations, and the human exposure due to PFR concentrations in indoor air appears to be higher than exposure due to PBDE concentrations in indoor air. Only the Cl-containing PFRs are carcinogenic. Other negative human health effects were found for Cl-containing PFRs as well as for TCP, which suggest that those PFRs would not be suitable alternatives for BFRs. TPhP, diphenylcresylphosphate (DCP) and TCP would not be suitable alternatives either, because they are considered to be toxic to (aquatic) organisms. Diethylphosphinic acid is, just like TCEP, considered to be very persistent. From an environmental perspective, resorcinol-bis(diphenylphosphate) (RDP), bisphenol-A diphenyl phosphate (BADP) and melamine polyphosphate, may be suitable good substitutes for BFRs. Information on PFR analysis in air, water and sediment is limited to TCEP, TCPP, TPhP, TCP and some other organophosphate esters. For air sampling passive samplers have been used as well as solid phase extraction (SPE) membranes, SPE cartridges, and solid phase micro-extraction (SPME). For extraction of PFRs from water SPE is recommended, because this method gives good recoveries (67-105%) and acceptable relative standard deviations (RSDs) (<20%), and offers the option of on-line coupling with a detection system. For the extraction of PFRs from sediment microwave-assisted extraction (MAE) is recommended. The recoveries (78-105%) and RSDs (3-8%) are good and the method is faster and requires less solvent compared to other methods. For the final instrumental analysis of PFRs, gas chromatography-flame photometric detection (GC-FPD), GC-nitrogen-phosphorus detection (NPD), GC-atomic emission detection (AED), GC-mass spectrometry (MS) as well as liquid chromatography (LC)-MS/MS and GC-Inductively-coupled plasma-MS (ICP-MS) are used. GC-ICP-MS is a promising method, because it provides much less complex chromatograms while offering the same recoveries and limits of detection (LOD) (instrumental LOD is 5-10 ng mL(-1)) compared to GC-NPD and GC-MS, which are frequently used methods for PFR analysis. GC-MS offers a higher selectivity than GC-NPD and the possibility of using isotopically labeled compounds for quantification.

... read more

1,530 Citations


Journal ArticleDOI: 10.1016/J.CARBON.2008.09.010
01 Dec 2008-Carbon
Abstract: Chemical structure of phosphorus species in two series of polymer-based and fruit-stone-based carbons obtained by phosphoric acid activation at 400–1000 °C were investigated by XPS and solid state 31 P-NMR and 13 C-NMR. It has been shown that the most abundant and thus thermally stable phosphorus species in all investigated carbons is phosphate-like structure bound to carbon lattice via C-O-P bonding. Small contribution of phosphonates (C-P-O linkage) was observed by 31 P NMR in carbons obtained at temperature range of 500–700 °C, phosphorus oxide was evidenced by XPS in carbon prepared at 900 °C and elemental phosphorus in carbon activated at 1000 °C.

... read more

Topics: Phosphorus oxide (59%), Phosphoric acid (58%), Phosphate (52%) ... read more

560 Citations


Journal ArticleDOI: 10.1016/J.WATRES.2008.12.001
Qiang Yu1, Ruiqi Zhang1, Shubo Deng1, Jun Huang1  +1 moreInstitutions (1)
01 Mar 2009-Water Research
Abstract: Perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) have increasingly attracted global concerns in recent years due to their global distribution, persistence, strong bioaccumulation and potential toxicity. The feasibility of using powder activated carbon (PAC), granular activated carbon (GAC) and anion-exchange resin (AI400) to remove PFOS and PFOA from water was investigated with regard to their sorption kinetics and isotherms. Sorption kinetic results show that the adsorbent size influenced greatly the sorption velocity, and both the GAC and AI400 required over 168h to achieve the equilibrium, much longer than 4h for the PAC. Two kinetic models were adopted to describe the experimental data, and the pseudo-second-order model well described the sorption of PFOS and PFOA on the three adsorbents. The sorption isotherms show that the GAC had the lowest sorption capacity both for PFOS and PFOA among the three adsorbents, while the PAC and AI400 possessed the highest sorption capacity of 1.04mmolg(-1) for PFOS and 2.92mmolg(-1) for PFOA according to the Langmuir fitting. Based on the sorption behaviors and the characteristics of the adsorbents and adsorbates, ion exchange and electrostatic interaction as well as hydrophobic interaction were deduced to be involved in the sorption, and some hemi-micelles and micelles possibly formed in the intraparticle pores.

... read more

Topics: Sorption (65%)

455 Citations


Journal ArticleDOI: 10.1016/J.JCLEPRO.2019.04.282
Jianlong Wang1, Shizong Wang1Institutions (1)
Abstract: Biochar is a carbon-rich material which can be prepared from various organic waste feedstock, such as agricultural wastes and municipal sewage sludge. Biochar has received increasing attention due to its unique feature such as high carbon content and cation exchange capacity, large specific surface area and stable structure. This review systematically analyzed and summarized the preparation, characterization, modification, and especially environmental application of biochar, based on more than 200 papers published in recent 10 year, to provide an overview of biochar with a particular on its environmental application. The physiochemical properties of biochar varies with the types of feedstocks. Pyrolysis, gasification and hydrothermal carbonization are the common methods for biochar preparation. Biochar can be modified by acid, alkali, oxidizing agents, metal ions, carbonaceous materials, steam and gas purging. The selection of modification methods depends on the environmental application fields. The biochar has been used for soil remediation and amelioration, carbon sequestration, organic solid waste composting, decontamination of water and wastewater, catalyst and activator, electrode materials and electrode modifier, which were discussed in detail. The application of biochar in the carbon sequestration should be further investigated at similar experimental conditions to obtain the consistent results. The effect of biochar on soil microbes should be further investigated to elucidate the dominant reason for the improvement of soil fertility based on different soil and feedstock. In addition, more attention should be paid to the release of heavy metals and polycyclic aromatic hydrocarbons (PAHs) from biochar to the environment when biochar is practically used for the environmental remediation. The relationship between biochar structure and activation capability should be further investigated to clarify the activation mechanism of persulfate by biochar when it is used as activator. In summary, biochar has wide application prospect in environmental remediation, and the mechanism of biochar in environmental application should be further investigated.

... read more

Topics: Biochar (77%), Pyrolysis (51%), Environmental remediation (51%)

414 Citations