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Lignin-based electrospun nanofiber membrane decorated with photo-fenton Ag@MIF-100(Fe) heterojunctions for complex wastewater remediation

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Frontiers of Chemical Science and Engineering 2023年第7期17卷 930-941页

作者： Guodong Tian Chao Duan Bingxu Zhou Chaochao Tian Qiang Wang Jiachuan Chen State Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyShandong Academy of SciencesJinan 250353China College of Bioresources Chemical and Materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China

Membrane technology for wastewater remediation has aroused wide interest owing to its unique properties and potential applications.However,it remains challenging to explore green,efficient and robust membrane material and technique for complex wastewater treatment.Herein,we proposed using a simple electrospinning and in situ seeding method to fabricate a lignin-based electrospun nanofiber membrane(LENM)decorated with photo-fenton Ag@MIL-100(Fe)heterojunctions for efficient separation of oil/water emulsions and degradation of organic dye.Thanks to the embedded lignin in LENM,an ultrahigh MIL-100(Fe)loading(53 wt%)with good wettability and high porosity was obtained.As a result,the hybrid Ag@MIL-100(Fe)/LENM exhibited excellent oil/water emulsions separation efficiency(more than 97%)without a compromise of water flux.Moreover,the hybrid membrane showed an excellent dye removal with degradation of 99%methylene blue within 30 min under illumination,which is attributed to a synergy of dye adsorption/enrichment and photo-fenton catalytic degradation from Ag@MIL-100(Fe).Therefore,the lignin-based photo-fenton hybrid membrane can lay the foundation for the preparation and application of green,sustainable and versatile membrane materials and technologies for efficient complex wastewater remediation.

关键词： lignin electrospinning heterojunctions photo-fenton catalysis wastewater remediation

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Optimization of photo-fenton Catalyst Preparation Based Bamboo Carbon Fiber by Response Surface Methodology

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Journal of Renewable Materials 2023年第1期11卷 147-165页

作者： Yizhang Wang Zhaoyang Yu Jinbo Hu Shanshan Chang Yuan Liu Ting Li Gonggang Liu Xiaodong(Alice)Wang College of Materials Science and Engineering Central South University of Forestry and TechnologyChangsha410004China Hunan Taohuajiang Bamboo Science&Technology Co. Ltd.Yiyang413400China Department of Wood and Forest Sciences Laval UniversityQuebecG1V 0A6Canada

In this paper,the residue from bamboo factory has been used to design photo-fenton catalyst,which has the advantages of low cost and magnetic recycling.The photo-fenton catalytic performance of the biocarbon-based catalyst was excellent and its optimal preparation process was also explored by response surface methodology.First,bamboo-carbon fiber was selected as the photo-fenton catalyst carrier.Subsequently,the surface of the car-bon fiber was modified,with which dopamine,nano-Fe_(3)O_(4) and nano-TiO_(2) were successively loaded by hydro-thermal method.After the single factor tests,four factors including dopamine concentration,ferric chloride mass,P25 titanium dioxide mass and liquid-solid ratio were selected as the characteristic values.The degradation efficiency of photo-fenton catalyst to methylene blue(MB)solution was treated as the response value.After the analysis of the response surface optimization,it was shown that the significance sequence of the selected 4 factors in terms of the MB degradation efficiency was arranged as follows:dopamine concentration>liquid-solid ratio>P25 titanium dioxide quality>ferric chloride quality.The optimal process parameters of fiber-carbon catalyst were affirmed as follows:the 1.7 mg/mL concentration of dopamine,the 1.2 g mass of ferric chloride,the 0.2 g mass of P25 titanium dioxide and the liquid-solid ratio of 170 mL/g.The experiment-measured average MB degra-dation efficiency performed by the optimized catalyst was 99.3%,which was nearly similar to the model-predicted value of 98.9%.It showed that the prediction model and response surface model were accurate and reliable.The results from response surface optimization could provide a good reference to design bamboo-based fenton-like catalyst with excellent catalytic performance.

关键词： photo-fenton catalysis bamboo fiber carbon fiber response surface optimization methylene blue

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Modified wool-iron biopolymer-based complex as an active heterogeneous decontamination photocatalyst

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Journal of Energy Chemistry 2016年第6期25卷 1064-1069页

作者： Lizhong Zhang Qian Zhai Xiufeng Zhao Xuemei Min Qiuhui Zhu Jianhui Li Department of Chemistry and Applied Chemistry Changji University National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters College of Chemistry and Chemical Engineering Xiamen University

A series of biopolymer based complex were manufactured by coordinating iron ions to the abundant amino-and sulfur-containing groups in the modified wool and used as heterogeneous fenton-like photocatalyst for 4-chlorophenol (4-CP) degradation in the presence of H2O2. Hydroxylamine hydrochloride (NH2OH center dot HCl) or acrylic acid was employed to modify the natural wool to strengthen the interaction with iron and to reinforce the structural stability. The NH2OH center dot HCl modified wool based complex showed the best catalytic performance for 4-CP degradation. The strong coordination between iron and great number of hydroxamic acid in this modified complex leads to the least iron leaching during the tests. HO center dot species was confirmed to be the dominant reactive oxidant in the decontamination process. The approach presented in this study can provide a new approach for developing novel bioployermer-based photocatalysts for efficient degradation of toxic organic pollutants such as 4-CP. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Heterogeneous catalysis photo-fenton catalysis Decontamination Biopolymer Wool-iron complex

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Coaxial Fe_(2)O_(3)/TiO_(2)nanotubes for enhanced photo-fenton degradation of electron-deficient organic contaminant

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Rare Metals 2021年第12期40卷 3543-3553页

作者： Yue Li Dan-Dan Cheng Yan Luo Li-Xia Yang Henan International Joint Laboratory of Rare Earth Composite Materials School of Materials and Chemical EngineeringHenan University of EngineeringZhengzhou 451191China High Level Laboratory of Jiangxi Province for Persistent Pollutants Control Recycle and ReuseNanchang Hangkong UniversityNanchang 330063China

Coaxial Fe_(2)O_(3)/TiO_(2)nanotubes(Fe_(2)O_(3)/TiO_(2)NTs)were prepared by two anodic oxidation processes.The synthesized Fe_(2)O_(3)/TiO_(2)NTs catalysts showed high photocatalytic activity in heterogeneous photo-fenton system.With the help of Fe_(2)O_(3)/TiO_(2)NTs,4-nitrophenol(10 mg·L^(-1),50 ml),a typical electron-deficient organic contaminant,can be completely removed by adding only0.4 mmol·L^(-1)of H_(2)O_(2)under irradiation.Investigation results clarify that the calculated position of Fe_(2)O_(3)/TiO_(2)NTs valence band is at 2.944 eV,its potential is higher than the potential of OH~-/·OH(2.800 eV),thereby ensuring the generation of·OH.Meanwhile,the transformation of photogenerated electrons from the conduction band of TiO_(2)to Fe_(2)O_(3)accelerates the reduction of Fe^(3+)to Fe^(2+).The unstable Fe^(2+)can be oxidized by H_(2)O_(2)to produce high yields of·OH.Therefore,both the coaxial heterojunction and fast Fe^(2+)/Fe^(3+)conversion provide abundant·OH to effective attack the electron-deficient benzene ring passivated by the nitro group.Thus,surface-catalyzed degradation of 4-nitrophenol can be carried out step by step.This work contributes a detailed understanding of charge transfer in semiconductor composites and degradation of organic contaminants.

关键词： Fe_(2)O_(3) TiO_(2) Coaxial Electron Deficient organic contaminant photo-fenton catalysis

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