Enhanced passivation of thallium,vanadium and arsenic in contaminated soils:critical role of Fe-Mn-biochar  

作　　者：Pengyuan Deng Wenhuan Yuan Jin Wang Liangzhong Li Yuchen Zhou Jingzi Beiyuan Haofan Xu Shunlong Jiang Zicong Tan Yurong Gao Diyun Chen Juan Liu 

机构地区：[1]Key Laboratory of Water Quality and Conservation in the Pearl River Delta,Ministry of Education,School of Environmental Science and Engineering,Guangzhou University,Guangzhou,China. [2]CAS Key Laboratory of Renewable Energy,Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development,Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China. [3]School of Environment and Chemical Engineering,Foshan University,Foshan 528000,China.

出　　处：《Biochar》2024年第1期1082-1094,共13页生物炭(英文)

基　　金：supported by the Natural Science Foundation of China(No.42173007);the Guangdong Provincial Natural Science Foundation for Distinguished Young Scholars(2021B1515020078);the Guangzhou Science and Technology Program(2024A03J0458);Guangdong Basic and Applied Basic Research Foundation(2023A1515012381);the Earth Critical Zone and Eco-geochemistry(PT252022024).

摘　　要：Thallium(Tl),vanadium(V)and arsenic(As)are considered as typical toxic elements of increased interest.Their accumulation in soils can pose a substantial health threat to human beings.In this study,Fe-Mn modified biochar(FMBC)was chemically constructed to immobilize Tl,V and As in contaminated soils.The results showed that compared with pristine biochar(BC),FMBC can achieve significantly higher passivation effects for the studied contaminated soils,which reduced the bioavailable Tl,V and As contents by 83.9%,71.09%and 71.92%,respectively.The passivation of Tl,As,and V via FMBC application was partially attributed to a notable increase in pH,which enhances the availability of adsorptive sites.Further,the newly formed minerals,including cancrinite,gibbsite and Fe-Mn(hydr)oxides,serve as additional adsorbents,substantially reducing the mobility of Tl,V and As.Additionally,the oxidation of Tl(I)to Tl(III)by the Fe-Mn(hydr)oxide of FMBC significantly enhanced Tl immobilization,consequently diminishing its bioavailability.The findings suggest that significant environmental threats could be alleviated through the potential application of FMBC in treating Tl-As-V dominated contamination in soils,providing a new perspective for the sustainable utilization of industrially polluted soils.

关 键 词：Modified biochar Toxic metal Environmental risk Soil amendment 

分 类 号：S15[农业科学—土壤学]