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A porous biochar supported nanoscale zero-valent iron material highly efficient for the simultaneous remediation of cadmium and lead contaminated soil

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Journal of Environmental Sciences 2022年第3期34卷 231-241页

作者： Wei Qian Jing-Yi Liang Wen-Xuan Zhang Shi-Ting Huang Zeng-Hui Diao Guangdong Provincial Engineering and Technology Research Center for Agricultural Land Pollution Prevention and Control Zhongkai University of Agriculture and EngineeringGuangzhou 510225China

Risk associated with heavy metals in soil has been received widespread *** this study,a porous biochar supported nanoscale zero-valent iron(BC-nZVI)was applied to immobilize cadmium(Cd)and lead(Pb)in clayey *** results indicated that the immobilization of Cd or Pb by BC-nZVI process was better than that of BC or nZVI process,and about 80%of heavy metals immobilization was obtained in BC-nZVI *** of BC-nZVI could increase soil pH and organic matter(SOM).Cd or Pb immobilization was inhibited with coexisting organic compound 2,4-dichlorophenol(2,4-DCP),but 2,4-DCP could be removed in a simultaneous manner with Cd or Pb immobilization at low concentration *** immobilization of Cd and Pb was achieved in BC-nZVI process,and both Cd and Pb availability significantly *** Cd species inculding Cd(OH)_(2),CdCO_(3)and CdO were formed,whereas stable Pb species such as PbCO_(3),PbO and Pb(OH)_(2)were produced with BC-nZVI *** immobilization mechanism of Cd and Pb in soil by BC-nZVI was thereby *** study well demonstrates that BC-nZVI has been emerged as a potential technology for the remediation of multiple heavy metals in soil.

关键词： Cadmium(Cd) Lead(Pb) biochar Nano zero valent iron(nZVI) Contaminated soil

Remediation performance and mechanisms of Cu and Cd contaminated water and soil using Mn/Al-layered double oxide-loaded biochar

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Journal of Environmental Sciences 2023年第3期125卷 593-602页

作者： Pengcheng Lin Hang Liu Hua Yin Minghan Zhu Haoyu Luo Zhi Dang School of Environment and Energy South China University of TechnologyGuangzhou 510006China Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters Guangzhou 510006China Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling Guangzhou 510006China

The combined pollution of heavy metals is ubiquitous ***/Al-layered double oxide-loaded crab shells biochar (LDO/BC) was prepared,so as to remediate the combined pollution of Cd and Cu in soil and *** pristine and used LDO/BC were characterized and the results revealed that the layered double oxide was successfully loaded on crab shells biochar (BC) and metal element Ca in crab shells was beneficial to the formation of more regular layered and flake *** maximal adsorption capacity (Qm) of LDO/BC for aqueous Cu^(2+)and Cd^(2+)was 66.23 and 73.47 mg/g,***/BC and BC were used to remediate e-waste-contaminated soil for the first time and exhibited highly efficient *** extraction amount of Cu and Cd in the contaminated soil by diethylene triamine penta-acetic acid (DTPA) after treating with 5% LDO/BC was significantly reduced from 819.84 to 205.95 mg/kg (with passivation rate 74.8%) and 8.46 to 4.16 mg/kg(with passivation rate 50.8%),respectively,inferring that the bioavailability of heavy metals declined *** experimental result also suggested that after remediation by LDO/BC the exchangeable and weak acid soluble Cu and Cd in soil translated to reducible,residual and oxidizable fraction which are more stable ***,complexation and ion exchange were proposed as the possible mechanisms for Cd and Cu *** general,these experiment results indicate that LDO/BC can be a potentially effective reagent for remediation of heavy metal contaminated water and soil.

关键词： Mn/Al-layered double oxide biochar Cd and Cu combined pollution Adsorption Soil remediation

biochar colloids and their use in contaminants removal

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biochar 2019年第2期1卷 151-162页

作者： Salman Safari Konstantin von Gunten MdSamrat Alam Magdalena Hubmann Tamzin ABlewett Ziyi Chi Daniel SAlessi Department of Earth and Atmospheric Sciences University of AlbertaEdmontonAlberta T6G 2E3Canada Department of Agricultural Foodand Nutritional ScienceUniversity of AlbertaEdmontonAlberta T6G 2P5Canada Department of Biological Sciences University of AlbertaEdmontonAlberta T6G 2E0Canada School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghaiChina

In this study, we report on the extraction, characterization, and potential applications of colloidal biochar derived from pyrolyzed wood-an untapped source of carbonaceous particles.A series of characterizations was performed on biochar colloids to unravel their colloidal properties and surface chemistry through which it was found that they have a net negative charge and are stable between pH 3 and ***,our initial toxicity tests showed that biochar colloids themselves are not toxic and they can be used in remediation applications,which led us to investigate(1)their copper sorption,a model inorganic contaminant,in a scenario that biochar colloids are released into the environment and(2)their potential use in organic pollutants adsorption and *** sorption studies showed that biochar colloids have a copper sorption capacity as high as 22 mg g^(−1) in sub-ppm copper *** increased the acute 48 h lethal concentration(LC50)of copper for Daphnia magna by 21 ppb,which is comparable to the previously reported effect by dissolved organic *** and degradation of methylene blue(MB),an often-used proxy for organic contaminants in water,were studied by coupling the biochar colloids to positively charged TiO_(2) nanoparticles and using it as a *** hybrid MB photodegradation efficiency was 21%higher than that of TiO_(2) nanoparticles *** of demethylation is proposed as the main degradation mechanism of MB,as confirmed by liquid chromatography-mass spectroscopy(LC/MS),and the positive impact of biochar colloids is ascribed to their abundant adsorption sites,which may facilitate MB adsorption and its photocatalytic degradation.

关键词： biochar Colloids Contaminants Photocatalysis Water treatment

A novel strategy of tannery sludge disposal–converting into biochar and reusing for Cr(Ⅵ)removal from tannery wastewater

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Journal of Environmental Sciences 2024年第4期138卷 637-649页

作者： Zhiwei Li Di Yu Xingdong Wang Xuejiao Liu Zhen Xu Yin Wang CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control CAS Haixi Industrial Technology Innovation Center in BeilunNingbo 315830China Key Laboratory of Urban Environment and Health Ningbo Observatio

Tannery sludge with high chromium content has been identified as hazardous solid waste due to its potential toxic *** safety disposal and valorization of the tannery sludge remains a *** this study,the chromium stabilization mechanism was systematically investigated during chromium-rich tannery sludge was converted to biochar and the removal performance of the sludge biochar(SBC)for Cr(Ⅵ)from tannery wastewater was also *** results showed that increase in pyrolysis temperature was conductive to the stabilization of Cr and significant reduction of the proportion of Cr(Ⅵ)in *** was confirmed that the stabilization of chromium mainly was attributed to the embedding of chromium in the C matrix and the transformation of the chromium-containing substances from the amorphous Cr(OH)_(3)to the crystalline state,such as(FeMg)Cr_(2)O_(5).The biochar presented high adsorption capacity of Cr(Ⅵ)at low pH and the maximal theoretical adsorption capacity of SBC produced at 800°C can reach 352 mg Cr(Ⅵ)/g,the process of which can be well expressed by Langmuir adsorption isotherm and pseudo second order *** electrostatic effect and reduction reaction were dominantly responsible for the Cr(Ⅵ)adsorption by ***,this study provided a novel strategy for the harmless disposal and resource utilization for the solid waste containing chromium in leather industry.

关键词： Chromium-rich tannery sludge Pyrolysis biochar Stabilizationmechanisms Cr(Ⅵ)adsorption

Remediation of di(2-ethylhexyl)phthalate(DEHP)contaminated black soil by freeze-thaw aging biochar

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Journal of Environmental Sciences 2024年第1期135卷 681-692页

作者： Lei Wang Zeyu Dou Chaoran Ma Xiaochen Jia Hongye Wang Wenjing Bao Lei Wang Jianhua Qu Ying Zhang School of Resources and Environment Northeast Agricultural UniversityHarbin 150030China

Di(2-ethylhexyl)phthalate(DEHP),a complex structure with high toxicity,is a common organic *** study investigated the effects of fresh biochar(FBC),and freeze-thaw cycled aged biochar(FTC-BC)on DEHP-contaminated soils using a pot *** specific surface area of FBC increased from 145.20 to 303.50 m~2/g,and oxygen-containing functional groups increased from 1.26 to 1.48 mol/g after freeze-thaw cycles,greatly enhancing the adsorption of DEHP by biochar in the *** comprehensive radar chart evaluation showed that FBC and FTC-BC reduced DEHP growth stress and improved the soil *** with FBC,FTC-BC performed better in protecting the normal growth of pakchoi and improving soil *** addition,the application of biochar increased the diversity and abundance of bacteria in the DEHP-contaminated soil and changed the composition of the soil bacterial *** partial least squares path model(PLS-PM)showed that adding biochar as a soil remediation agent significantly positively impacted soil nutrients and indirectly reduced the DEHP levels in soil and plants by increasing soil microbial *** with FBC,FTC-BC creates a more satisfactory living environment for microorganisms and has a better effect on the degradation of DEHP in the *** study provides a theoretical basis for future biochar remediation of DEHP-contaminated soils in cold high-latitude regions.

关键词： DEHP Freeze-thaw cycles biochar Soil restoration

biochar-Induced Priming Effects in Young and Old Poplar Plantation Soils

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Phyton-International Journal of Experimental Botany 2020年第1期89卷 13-26页

作者： Weiwei Lu Yirui Zhang Yixian Yao Yuying Wu Han Y.H.Chen Hailin Zhang Jia Yu Caiqin Shen Qi Liu Honghua Ruan College of Biology and the Environment Co-Innovation Center for Sustainable Forestry in Southern ChinaNanjing Forestry UniversityNanjing210037China Faculty of Natural Resources Management Lakehead UniversityThunder BayONP7B 5E1Canada Department of Plant and Soil Sciences Oklahoma State UniversityStillwaterOK74078USA Advanced Analysis and Testing Center Nanjing Forestry UniversityNanjing210037China State Owned Forest Farm of Dongtai Dongtai224200China College of Forestry Nanjing Forestry UniversityNanjing210037China

The priming effect(PE)induced by biochar provides a basis for evaluating its carbon(C)sequestration potential in soils.A 60 days’laboratory incubation was conducted,which involved the amendment of biochar(1%of soil mass)produced from rice straw at 300℃(B300)and 500℃(B500)to young(Y)and old(O)poplar plantation soils,with the aim of studying the responses of biochar-induced PEs to poplar plantation *** incubation included six treatments:Y+CK(control),Y+B300,Y+B500,O+CK,O+B300,and O+*** dioxide(CO_(2))emissions were significantly increased(pbiochar amendment throughout the incubation,indicating greater C-limit of soil microorganisms in the young poplar plantation *** ^(13)C isotope tracing,neither B300 nor B500 decreased native soil-derived DOC,which indicated that the negative B500-induced PEs were not due to a reduction in the availability of native soil-derived *** conclusion,the response of biochar-induced PEs to poplar plantation age depends on biochar types while soil available C indirectly affects biochar-induced *** studies should focus on how the interactive effects between soil C availability and microbial community impacts biochar-induced PEs.

关键词： biochar dissolved organic carbon pyrolysis temperature poplar plantation age priming effect

Assessing the capacity of biochar to stabilize copper and lead in contaminated sediments using chemical and extraction methods

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Journal of Environmental Sciences 2019年第5期31卷 91-99页

作者： Mingming Wang Liangsuo Ren Dayang Wang Zuansi Cai Xuefeng Xia Aizhong Ding College of Water Sciences Beijing Normal University School of Engineering and the Built Environment Edinburgh Napier University

Because of its high adsorption capacity, biochar has been used to stabilize metals when remediating contaminated soils; to date, however, it has seldom been used to remediate contaminated sediment. A biochar was used as a stabilization agent to remediate Cu-and Pb-contaminated sediments, collected from three locations in or close to Beijing. The sediments were mixed with a palm sawdust gasified biochar at a range of weight ratios(2.5%, 5%, and 10%) and incubated for 10, 30, or 60 days. The performance of the different treatments and the heavy metal fractions in the sediments were assessed using four extraction methods, including diffusive gradients in thin films, the porewater concentration, a sequential extraction, and the toxicity characteristic leaching procedure. The results showed that biochar could enhance the stability of heavy metals in contaminated sediments. The degree of stability increased as both the dose of biochar and the incubation time increased. The sediment p H and the morphology of the metal crystals adsorbed onto the biochar changed as the contact time increased. Our results showed that adsorption,metal crystallization, and the p H were the main controls on the stabilization of metals in contaminated sediment by biochar.

关键词： biochar Sediment Heavy metal Stabilization assessment

Effects of different types of biochar on the properties and reactivity of nano zero-valent iron in soil remediation

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Frontiers of Environmental Science & Engineering 2021年第5期15卷 257-269页

作者： Chengjie Xue Juan Wu Kuang Wang Yunqiang Yi Zhanqiang Fang Wen Cheng Jianzhang Fang School of Environment South China Normal UniversityGuangzhou510006China Institute of Environmental Sciences(CML) Leiden UniversityLeiden2300 RAThe Netherlands Guangdong Technology Research Center for Ecological Management and Remediation of Water System Guangzhou510006China Guangdong Provincial Key Laboratory of Chemical Pollution&Environmental Safety Guangzhou510006China

The addition of nano zero-valent iron(nZVI)is a promising technology for the in situ remediation of ***,the mobility and,consequently,the reactivity of nZVI particles in contaminated areas decrease due to their rapid *** this study,we determined how nZVI particles can be stabilized using different types of biochar(BC)as a support(BC@nZVI).In addition,we investigated the transport behavior of the synthesized BC@nZVI particles in a column filled with porous media and their effectiveness in the removal of BDE209(decabromodiphenyl ether)from *** characterization results of N2 Brunauer-Emmett-Teller(BET)surface area analyses,scanning electron microscopy(SEM),X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTIR)indicated that nZVI was successfully loaded into the *** sedimentation test results and the experimental breakthrough curves indicated that all of the BC@nZVI composites manifested better stability and mobility than did the bare-nZVI particles,and the transport capacity of the particles increased with increasing flow velocity and porous medium ***,the maximum concentrations of the column effluent for bagasse-BC@nZVI(B-BC@nZVI)were 19%,37%and 48%higher than those for rice straw-BC@nZVI(R-BC@nZVI),wood chips-BC@nZVI(W-BC@nZVI)and corn stalks-BC@nZVI(C-BC@nZVI),respectively.A similar order was found for the removal and debromination efficiency of decabromodiphenyl ether(BDE209)by the aforementioned ***,the attachment of nZVI particles to BC significantly increased the reactivity,stability and mobility of B-BC@nZVI yielded,and nZVI the best performance.

关键词： Nano zero-valent iron biochar BDE209 Transport Soil

NaOH–ball-milled co-modified magnetic biochar and its oil adsorption properties

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Particuology 2023年第12期83卷 40-49页

作者： Zehua Wei Haihong Li Miaomiao Jia Ting Lin School of Environmental and Chemical Engineering Xi'an Polytechnic UniversityXi'an710048China

A magnetic biochar adsorbent(BM–OH–BC)was prepared through NaOH–ball milling co-modification with walnut shells as the raw material,and its oil adsorption characteristics were *** adsorption properties of oil pollutants were compared before and after the NaOH-ball-milling co-modification,and the mechanism of NaOH-ball-milling on oil pollutants was investigated by scanning electron microscope-energy dispersive X-ray spectroscopy,BET,X-ray photoelectron spectroscopy and Fourier transform infrared *** experimental results showed that the oil adsorption capacity of BM–OH–BC can reach 2.75 g/g,which is 129%higher than that of unmodified ***,after five adsorption and desorption cycles,the adsorption rate of BM–OH–BC only decreased by 5.9%,which was because the oil adsorption of BM–OH–BC is mainly chemical *** adsorption processes involving single layer,heterogeneous phase and multilayer made BM–OH–BC have excellent adsorption *** biochar co-modification,the specific surface area of BM–OH–BC increased to 466 m^(2)/g,the total pore volume increased to 0.245 cm^(3)/g,the average pore size decreased to1.90 nm,and the number of hydrophobic non-polar functional groups increased,leading to the enhancement of its oil absorption *** study provides a reference for the treatment of oil-contaminated water bodies.

关键词： biochar Oil pollution Adsorptionproperties Modificationmechanism