scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Adsorption of heavy metal sewage on nano-materials such as titanate/TiO2 added lignin

01 Mar 2019-Results in physics (Elsevier)-Vol. 12, pp 405-411
TL;DR: In this paper, the performance of the lignin-assisted synthesis of titanate nanotubes (WL-TNTs) was investigated and the results showed that WL TNTs had good adsorption effect on Pb2+, Cu2+ and Cd2+, especially Pb 2+ had a good effect over a wide pH range.
Abstract: Biomolecules (lignin) were used as additives for the synthesis of titanate/TiO2 nanomaterials, and their adsorption properties and photocatalytic properties were studied. They were based on corn stalks, cotton stalks, poplar twigs and willow shavings, respectively. Lignin was extracted from it to aid in the synthesis of titanate nanotube material. The products were characterized by XRD (X-Ray Diffraction), FESEM (Field emission scanning electron microscopy), TEM, FTIR (Fourier Transform Infrared Spectroscopy) and BET, and their adsorption properties were studied. The study found that by comparing the maximum adsorption capacity of heavy metal ions (Pb2+, Cu2+, Cd2+) with four different lignin-containing titanate nanotube materials, the adsorption performance of the lignin-assisted synthesis of titanate nanotubes (WL-TNTs) was optimal. WL-TNTs material had good adsorption effect on Pb2+, Cu2+ and Cd2+, especially Pb2+ had a good adsorption effect over a wide pH range (pH of 2–7). At pH = 6 (lead ion was 5.5) and at 25 °C, the maximum adsorption capacity of WL-TNTs for Pb2+, Cu2+ and Cd2+ reached 677.6 mg/g, 258.2 mg/g and 308.5 mg/g, respectively, and the adsorption rate was fast. The lead ions can be adsorbed almost completely in 5 min and the best dosage of adsorbent was only 0.2 g/L. At the same time, the material had excellent adsorption and analytical regeneration performance. It was a good and economical adsorbent and had broad application prospects.
Citations
More filters
Journal ArticleDOI
TL;DR: GOCS has been proved to be a novel, useful, and potentially economic adsorbent for the high-efficiency removal of Pb(II) from aqueous solutions.

62 citations

Journal ArticleDOI
Chenglong Jiang1, Xiaohong Wang1, Bingxia Hou1, Chen Hao1, Xin Li1, Jingbo Wu1 
TL;DR: The results show that CLS-Lys adsorbent has good adsorption and analytical regeneration performance, and is an economic and effective adsorbents, and has a broad application prospect.
Abstract: Industrial wastewater has brought great disaster to water bodies and soils and seriously affected the growth of crops. It is necessary to prepare a stable, effective, and sustainable treatment agen...

62 citations

Journal ArticleDOI
Fangfang Wu1, Long Chen1, Peng Hu1, Yunxiao Wang1, Jie Deng1, Baobin Mi 
TL;DR: Alkali-lignin derived biochar is a promising material for the remediation of polluted by Pb(II), with a maximum adsorption capacity almost twice that of the former, and a much faster absorption rate.

61 citations

Journal ArticleDOI
TL;DR: The use of lignin in the synthesis and chemistry of inorganic materials in selected applications with relevance to sustainable energy and environmental fields is reviewed and an overview on future directions for this research field that bridges inorganic and lignIn materials for a more sustainable future is closed.
Abstract: Lignin is one the most fascinating natural polymers due to its complex aromatic-aliphatic structure. Phenolic hydroxyl and carboxyl groups along with other functional groups provide technical lignins with reactivity and amphiphilic character. Many different lignins have been used as functional agents to facilitate the synthesis and stabilization of inorganic materials. Herein, the use of lignin in the synthesis and chemistry of inorganic materials in selected applications with relevance to sustainable energy and environmental fields is reviewed. In essence, the combination of lignin and inorganic materials creates an interface between soft and hard materials. In many cases it is either this interface or the external lignin surface that provides functionality to the hybrid and composite materials. This Minireview closes with an overview on future directions for this research field that bridges inorganic and lignin materials for a more sustainable future.

55 citations

Journal ArticleDOI
TL;DR: The results showed that the EPS chains can intercalate into montmorillonite layers by hydrogen bonding connection and chemical reaction between CO, C-N and COO- groups with interlayer cations of montMorillonite, therefore promoting delamination of montmorillionite, especially under a lower weight ratio.

53 citations

References
More filters
Journal ArticleDOI
TL;DR: Micrometer-thick MXene membranes demonstrated ultrafast water flux of 37.4 L/(Bar·h·m(2)) and differential sieving of salts depending on both the hydration radius and charge of the ions.
Abstract: Nanometer-thin sheets of 2D Ti3C2Tx (MXene) have been assembled into freestanding or supported membranes for the charge- and size-selective rejection of ions and molecules. MXene membranes with controllable thicknesses ranging from hundreds of nanometers to several micrometers exhibited flexibility, high mechanical strength, hydrophilic surfaces, and electrical conductivity that render them promising for separation applications. Micrometer-thick MXene membranes demonstrated ultrafast water flux of 37.4 L/(Bar·h·m2) and differential sieving of salts depending on both the hydration radius and charge of the ions. Cations with a larger charge and hydration radii smaller than the interlayer spacing of MXene (∼6 A) demonstrate an order of magnitude slower permeation compared to single-charged cations. Our findings may open a door for developing efficient and highly selective separation membranes from 2D carbides.

661 citations

Journal ArticleDOI
TL;DR: This work demonstrates the first molecular-level conversion pathway of NO oxidation over a novel SrO-clusters@amorphous carbon nitride (SCO-ACN) photocatalyst, which is synthesized via copyrolysis of urea and SrCO3, and presents a novel in situ DRIFTS-based strategy to explore the photocatalytic reaction pathway.
Abstract: This work demonstrates the first molecular-level conversion pathway of NO oxidation over a novel SrO-clusters@amorphous carbon nitride (SCO-ACN) photocatalyst, which is synthesized via copyrolysis of urea and SrCO3. The inclusion of SrCO3 is crucial in the formation of the amorphous carbon nitride (ACN) and SrO clusters by attacking the intralayer hydrogen bonds at the edge sites of graphitic carbon nitride (CN). The amorphous nature of ACN can promote the transportation, migration, and transformation of charge carriers on SCO-ACN. And the SrO clusters are identified as the newly formed active centers to facilitate the activation of NO via the formation of Sr-NOδ(+), which essentially promotes the conversion of NO to the final products. The combined effects of the amorphous structure and SrO clusters impart outstanding photocatalytic NO removal efficiency to the SCO-ACN under visible-light irradiation. To reveal the photocatalytic mechanism, the adsorption and photocatalytic oxidation of NO over CN and SC...

186 citations

Journal ArticleDOI
TL;DR: Ti/EBNTA electrodes operated in a bipolar mode have a minimum energy consumption of 62 kWh/kg COD, reduced foam formation due to less gas bubble production, minimum scale formation, and lower chlorate production levels (6 mM vs 18 mM for BDD) during electrolytic wastewater treatment.
Abstract: Efficient, inexpensive, and stable electrode materials are key components of commercially viable electrochemical wastewater treatment system. In this study, blue-black TiO2 nanotube array (BNTA) electrodes are prepared by electrochemical self-doping. The 1-D structure, donor state density, and Fermi energy level position are critical for maintaining the semimetallic functionality of the BNTA. The structural strength of the BNTA is enhanced by surface crack minimization, reinforcement of the BNTA-Ti metal interface, and stabilized by a protective overcoating with nanoparticulate TiO2 (Ti/EBNTA). Ti/EBNTA electrodes are employed as both anodes and cathodes with polarity switching at a set frequency. Oxidants are generated at the anode, while the doping levels are regenerated along with byproduct reduction at the cathode. The estimated maximum electrode lifetime is 16 895 h. Ti/EBNTA has comparable hydroxyl radical production activity (6.6 × 10–14 M) with boron-doped diamond (BDD, 7.4 × 10–14 M) electrodes. ...

176 citations

Journal ArticleDOI
TL;DR: The enhanced photocatalytic performances arise from the synergetic action of the special TiO2(B) phase, Ti3+ self-doping, and the 1D rod-shaped single-crystalline nanostructure, favoring the visible light utilization and the separation and transportation of photogenerated charge carriers.
Abstract: Ti3+ self-doped blue TiO2(B) single-crystalline nanorods (b-TR) are fabricated via a simple sol–gelation method, cooperated with hydro-thermal treatment and subsequent in situ treatment method, and afterward annealed at 350 °C in Ar. The structures are characterized by X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (UV–vis), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The prepared b-TR with narrow band gap possesses single-crystalline TiO2(B) phase, Ti3+ self-doping, and one-dimensional (1D) rodlike nanostructure. In addition, the improved photocatalytic performance is studied by decomposition of Rhodamine B (RhB) and hydrogen evolution. The degradation rate of RhB by Ti3+ self-doped blue TiO2(B) single-crystalline nanorods is ∼6.9- and 2.1-times higher compared with the rates of titanium dioxide nanoparticles and pristine TiO2(B) nanorods under visible light illumination, respectively. The hydrogen evolution rat...

145 citations

Journal ArticleDOI
TL;DR: The SPF technique provides an approach for developing highly efficient catalysts for the complete removal of volatile organic compounds, by allowing the facile and energy-saving fabrication of large quantities of layered CuO-δ-MnO2 hybrids.
Abstract: A new self-propagated flaming (SPF) technique was applied to the synthesis of highly active layered CuO-δ-MnO2 hybrid composites, for the de-polluting catalytic total oxidation of gaseous toluene vapor. Other transition metal oxide-doped MnO2 hybrid composites were also successfully prepared and investigated, ensuring a feasible strategy for the fabrication of various layered MOx-δ-MnO2 (M═Co, Ni, or Zn) hybrids. By changing the molar ratio of the precursors (KMnO4 and acetate salt) and the type of transition metal oxide introduced, it is possible to control the crystal structure and reducibility of the sheetlike hybrid composites as well as the catalytic activity for the total oxidation of toluene. The catalyst sample (CuO-δ-MnO2) with a Mn/Cu molar ratio of 10:1 exhibited the highest catalytic performance, with a lower reaction temperature of 300 °C for complete toluene removal, which was comparable to the reaction temperature for total toluene conversion by the Pt-based catalyst. The SPF technique prov...

87 citations