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Enhancing the adsorption function of biochar by mechanochemical graphitization for organic pollutant removal

Frontiers of Environmental Science & Engineering 2021年第6期15卷 379-390页

作者： Peidong Su Xiangyu Gao Junke Zhang Ridha Djellabi Bo Yang Qi Wu Zhen Wen College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China State Key Laboratory of Urban Water Resources and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Senior 3 Houde AcademyShenzhen 518000China

Biochar(BC)has been extensively studied as adsorbent for the treatment of water *** the distinct advantages,the high calcination temperature and low adsorption capacity of pristine BC limit its practical *** of the former studies focused on the structure and/or surface modification to improve the adsorption capacity of ***,the harsh experiment conditions involved in the biochar modification limited the application in industrial ***,we introduced mechanical treatment into BC preparation to reduce the calcination temperature and improve the adsorption capacity *** results indicated that the calcination temperature was reduced and the adsorption capacity of the treated BC was improved after mechanochemical *** of the samples disclosed that BCs were graphitized with the particle size reduced to nanoscale after *** tests indicated that the mechanochemically treated BCs showed much better removal performance of organic contaminants than that of pristine *** instance,among four pristine BCs(BC600,BC700,BC800,and BC900),only BC900 has strong adsorption capacity for MB,while BC600 has low adsorption capacity(1.2 mg/g).By comparison,the adsorption capacity of MB increased greatly to 173.96 mg/g by BC600-500/1(treated at 500 r/min for 1 hour).To optimize the mechanochemical treatment,the effects of rotation speed and agitation duration were also investigated.

关键词： Biochar Mechanochemical treatment Graphitization Calcination temperature organic pollutant

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Spray deposited yttrium incorporated TiO_(2) photoelectrode for efficient photoelectrocatalytic degradation of organic pollutants

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Journal of Rare Earths 2023年第12期41卷 1929-1937,I0004页

作者： N.A.Narewadikar R.S.Pedanekar V.G.Parale H.H.Park K.Y.Rajpure Electrochemical Materials Laboratory Department of PhysicsShivaji UniversityKolhapur46004India Department of Materials Science and Engineering Yonsei University Seoul037322South Korea

This work presents result on yttrium-doped titanium dioxide(YTO) thin films using a cost-effective spray pyrolysis technique for the photoelectrocatalytic degradation of phthalic acid(PA) and benzoic acid(BA).The physicochemical properties of YTO thin films were studied using X-ray diffraction,Raman spectroscopy,X-ray photoelectron spectroscopy,field-emission scanning electron microscopy,UV-vis spectroscopy,*** obtained results confirm the presence of yttrium in the host *** band bending and flat band positions were studied using Mott-Schottky *** film with 1% doping amount shows the highest degradation efficiency for both the model pollutants compared to TiO_(2).The stability of 1% YTO film confirms excellent performance analyzed by recycling tests using a UV-vis *** results highlight the significance of rare earth metal doping in TiO_(2)for improved photoelectrocatalytic degradation efficiency.

关键词： Doping organic pollutant Spray pyrolysis Thin film TiO_(2) Rare earths

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An Allochroic Molecular Cage Switch for Sensing and Capturing organic pollutants

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Chemical Research in Chinese Universities 2023年第2期39卷 310-317页

作者： JIA Yin FENG Fanda SONG Xinyu SHI Zhiqiang SUN Lin JIANG Ruiyu TANG Lanqin ZHANG Lei Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng224051China State Key Laboratory of Coordination Chemistry Nanjing National Laboratory of MicrostructuresSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210093China

The adsorption method is considered to be one of the most promising organic pollutants emission reduction *** design and synthesis of high-performance porous adsorbents are one of the most important but challenging *** this work,we constructed a new class of porous molecular cage switches by a simple reaction using phenolphthalein as the raw *** molecular cage switches displayed interesting on-off behavior towards organic guests,which is highly responding to organic pollutants with rapid color change and is also able to adsorb these organic pollutants through an open-to-close *** molecular cage switch also has excellent regenerative cycling properties and water resistance,which is expected to be employed in the handling of organic pollutants in the future.

关键词： Porous organic cage Molecular switch Phenolphthalein organic pollutant Sensor

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Hydrodynamic Cavitation Enhanced SR-Aops Degradation of organic pollutants in Water:A Review

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Fluid Dynamics & Materials Processing 2024年第4期20卷 671-692页

作者： Xiufeng Zhu Jingying Wang School of Energy and Power Engineering Shandong UniversityJinan250061China Key Laboratory of High Efficiency and Clean Machinery Manufacturing of Ministry of Education School of Mechanical EngineeringShandong UniversityJinan250061China

SR-AOP(sulfate radical advanced oxidation process)is a novel water treatment method able to eliminate refractory organic *** cavitation(HC)is a novel green technology,that can effectively produce strong oxidizing sulfate *** paper presents a comprehensive review of the research advancements in these fields and a critical discussion of the principal factors influencing HC-enhanced SR-AOP and the mechanisms of synergistic ***,some insights into the industrial application of HC/PS are also *** research shows that this technology is feasible at the laboratory stage,but its application on larger scales requires further understanding and *** this review,some attention is also paid to the design of the hydrodynamic cavitation reactor and the related operating parameters.

关键词： Hydrodynamic cavitation organic pollutant persulfate degradation influence factor

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Novel SiO2 nanoparticle-decorated BiOCl nanosheets exhibiting high photocatalytic performances for the removal of organic pollutants

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Chinese Journal of Catalysis 2019年第8期40卷 1212-1221页

作者： Changlin Yu Hongbo He Xingqiang Liu Julan Zeng Zhen Liu School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and ControlGuangdong University of Petrochemical TechnologyMaoming 525000GuangdongChina School of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275GuangdongChina School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082GuangdongChina School of Environmental Science and Engineering Key Laboratory of Estuarine Ecological Security and Environmental HealthXiamen University Tan Kah Kee CollegeZhangzhou 363105FujianChina School of Chemisry and Food Engineering Changsha University of Science and TechnologyChangsha 410114China

Novel SiO2/BiOCl composites were fabricated by decorating BiOCl nanosheets with SiO2 nanoparticles via a simple hydrothermal process. The as-prepared pure BiOCl and SiO2/BiOCl composites were intensively characterized by various techniques such as XRD, FT-IR, SEM/TEM, BET, UV-vis, DRS, XPS, and photocurrent measurements. The SiO2/BiOCl composite nanosheets displayed high photocatalytic activity and excellent stability in the degradation of organic pollutants such as phenol, bisphenol A (BPA), and rhodamine B (RhB). With respect to those over bare BiOCl, the degradation rates of RhB, BPA, and phenol over 1.88% SiO2/BiOCl increased 16.5%, 29.0%, and 38.7%, respectively. Radical capturing results suggested that h^+ is the major reactive species and that hydroxyl (·OH) and superoxide (·O2^-) radicals could also be involved in the degradation of organic pollutants. The enhanced photocatalytic performances of SiO2/BiOCl composites can be mainly attributed to the improved texture and the formation of intimate SiO2/BiOCl interfaces, which largely promoted the adsorption of organic pollutants, enhanced the light harvesting, and accelerated the separation of e^– and h^+.

关键词： SiO2/BiOCl Nanosheets organic pollutant Photocatalysis Interface

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Effects of vegetations on the removal of contaminants in aquatic environments: A review

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Journal of Hydrodynamics 2014年第4期26卷 497-511页

作者：王超郑莎莎王沛芳钱进 Key Laboratory of Integrated Regulation and Resource Department on Shallow Lakes Ministry of Education College of Environment Hohai University

This paper reviews the removal of contaminants including nutrients, metals and organic pollutants by vegetations in aquatic environments. The removal efficiencies are considered with respect to 16, 19 and 14 kinds of different aquatic plants, respectively in three tables. Due to different characteristics, the removal effects of plants on contaminants from the overlying water differ greatly. The vegetation can improve the water quality mainly through two ways：（1） to adsorb and absorb pollutants from water, （2） to prevent pollutants from releasing from sediment. The contaminant removal mechanisms of vegetations and related physical, chemical and biological effects are discussed. The effects of vegetations on the contaminant removal are found to depend on the environmental conditions, the number and the type of plants, the nature and the chemical structure of the pollutants. In addition, the contaminant release and reoaoval by vegetations under hydrodynamic conditions is specially addressed. Further research directions are suggested.

关键词： vegetation nutrient metal organic pollutant removal hydrodynamic condition

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Seasonal Variation and Removal of organic pollutants in Wastewater Using Low-Cost Treatment Technologies in Tamale Metropolis, Ghana

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Journal of Water Resource and Protection 2021年第4期13卷 271-282页

作者： Felix K. Abagale West African Centre for Water Irrigation and Sustainable Agriculture University for Development Studies Tamale Ghana

The use of wastewater as alternative source of water for vegetable crop irrigation has become an eminent component of urban agriculture due to current global water crises in most developing countries, and admits the increasing effects of global climate change. The practise is however noted to be associated with significant health and environment risk due to excessive pollutant load. The study assessed the level of seasonal variation and removal of organic pollutants in wastewater using gravel filters combined with stabilisation ponds at Zagyuri in the Tamale Metropolis. The yard scale experiment consisted of cylindrical containers of different length filled with six different sizes of filter media and connected to stabilisation ponds where wastewater is allowed to pass through for filtration and stabilisation. The results indicated that for both seasons, the average concentration of BOD released into the stream at Zagyuri was 92.98 mg/l and 103.54 mg/l for the dry and wet season respectively whilst the COD was averaged 132.78 mg/l and 143.75 mg/l for the dry and wet seasons respectively. The results of the simple linear regression revealed a strong positive linear relationship between BOD and COD with coefficient of determination (R2) of 0.873 which was statistically highly significantly at Pr value of Pr values of 0.0011 and 5 and COD. The average concentration of BOD was higher than the Ghana EPA recommended levels while that of COD was lower and thus within safety range for discharge into the environment.

关键词： organic pollutant BOD5 COD Wastewater Treatment

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Phytoremediation and its models for organic contaminated soils

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Journal of Environmental Sciences 2003年第3期15卷 302-310页

作者： GAO Yan-zheng ZHU Li-zhong Department of Environment Science Zhejiang UniversityHangzhou 310028China.

Soil pollution has been attracting considerable public attentions over the last decades. Sorts of traditional physiochemical methods have been used to remove the organic pollutants from soils. However, the enormous costs and low efficiencies associated with these remediation technologies limit their availabilities. Phytoremediation is an emerging technology that uses plants to cleanup pollutants in soils. As overwhelmingly positive results have been shown, phytoremediation is a most economical and effective remediation technique for organic contaminated soils. In this paper phytoremediation and its models for organic contaminated soils are viewed. The mechanisms of phytoremediation mainly include the direct plant uptake of organic pollutants, degradation by plant-derived degradative enzymes, and stimulated biodegradation in plant rhizosphere. Phytoremediation efficiency is close related to physicochemical properties of organic pollutants, environmental characteristics, and plant types. It is no doubt that soil amendments such as surfactants improve the solubilities and availabilities of organic pollutants in soils. However, little information is available about effects of soil amendments on phytoremediation efficiencies. Phytoremediation models have been developed to simulate and predict the environmental behavior of organic pollutants, and progress of models is illustrated. In many ways phytoremediation is still in its initial stage, and recommendations for the future research on phytoremediation are presented.

关键词： phytoremediation organic pollutant soil

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Dual Z-scheme Bi_(3)TaO_(7)/Bi_(2)S_(3)/SnS_(2)photocatalyst with high performance for Cr(Ⅵ)reduction and TC degradation under visible light irradiation

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Rare Metals 2022年第7期41卷 2417-2428页

作者： Jing-Jing Xu Hao-Yu Gu Min-Dong Chen Xue-Ping Li Hong-Wen Zhao Hong-Bin Yang Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing 210044China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Nanjing 210044China Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials Nanjing 210044China School of Environmental Science and Engineering Nanjing University of Information Science and TechnologyNanjing 210044China Nanyang Technological University Singapore 639798Singapore

Ternary direct dual Z-scheme Bi_(3)T_(a)O_(7)/Bi_(2)S_(3)/SnS_(2) photocatalyst was successfully prepared by hydrothermal *** composite photocatalysts exhibited high photocatalytic performance on both Cr(Ⅵ)reduction and tetracycline(TC)degradation under the irradiation of visible *** results manifested that the photogenerated charge transfer efficiency was improved after forming the dual Z-scheme *** a result,the composite catalysts exhibited higher photocat-alytic degradation efficiency than the corresponding single *** apparent rate constant(k)value of the best sample BBS-3 for TC degradation was 0.0403 min^(-1),which was 40 times,8 times,and 18 times higher than that of single *** the k value of BBS-3 for the Cr(Ⅵ)reduction was 0.0249 min^(-1),it was about 23 times,7 times,and 18 times that of single *** experiments indicated that the BBS-3 had good photocat-alytic ***,the possible mechanism on Cr(Ⅵ)reduction and TC degradation was proposed based on the experimental results.

关键词： Photocatalysis Dual Z-scheme Heterojunction Heavy metal organic pollutant

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Effect of doped strontium on catalytic properties of La_(1-x)SrxMnO_(3) for rhodamine B degradation

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Journal of Rare Earths 2021年第11期39卷 1362-1369,I0002页

作者： Jiaxiu Guo YueJing Ting Shen Hongdi Luo Juan Liang Shandong Yuan College of Architecture and Environment Sichuan UniversityChengdu 610065China National Engineering Technology Research Center for Flue Gas Desulfurization Chengdu 610065China Institute of New Energy and Low Carbon Technology Sichuan UniversityChengdu 610065China

A series of La_(1-x)Sr_(x)MnO_(3) samples were prepared by sol-gel method and used to degrade rhodamine B(RhB) in *** samples were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),N_(2) adsorption-desorption,temperature-programmed reduction of H_(2)(H_(2)-TPR) and temperature-programmed desorption of O_(2)(O_(2)-TPD).The results show that the degradation of RhB is highly dependent on the initial pH value of *** doping enhances the degradation ability of LaMnO_(3) for RhB in the time range of 0-40 min under a strong acidic environment,but all samples exhibit similar degradation rate from 40 to 60 *** La_(0.7)Sr_(0.3)MnO_(3)-RhB reaction system,there are two different degradation pathways,including N-de-ethylation,chromophore cleavage,ring-opening and ***_(1-x)Sr_(x)MnO_(3)(x ≤0.3) has the perovskite structure of La-Mn oxides,while La_(0.6)Sr_(0.4)MnO_(3) exhibits a Sr_(0.4)MnLa_(0.6)O_(2).98 perovskite *** doping leads to distortion of rhombohedral crystal structure and increases the relative content of Mn^(4+).The perovskite structure is stable in strong acidic environment during RhB degradation,but the relative content of Mn^(4+)and Mn^(3+) on the material surface *** doped LaMnO_(3) achieves specific surface area of 58.8 m^(2)/g and total pore volume of 0.152 cm^(3)/***,Sr^(2+)doping improves redox properties of La-Mn oxides,and the presence of defects makes oxygen diffusion easier compared with the undoped samples.

关键词： organic pollutant Degradation Rhodamine B LaMnO_(3) Sr Perovskite

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