Mechanistic insights into the synergetic remediation and amendment effects of zeolite/biochar composite on heavy metal-polluted red soil  

作　　者：Jing Li Dazhong Yang Wensong Zou Xuezhen Feng Ranhao Wang Renji Zheng Siyuan Luo Zheting Chu Hong Chen 

机构地区：[1]State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Frontiers of Environmental Science & Engineering》2024年第9期105-114,共10页环境科学与工程前沿（英文）

基　　金：supported by the National Key Research and Development Program of China(No.2021YFA1202500);the Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control(No.2023B1212060002);the Stable Support Plan Program of Shenzhen Natural Science Foundation(No.20231122110855002);the High level of special funds(No.G03050K001)from SUSTech and a Special Fund for the Science and Technology Innovation Strategy of Guangdong Province(No.PDJH2021C0033).

摘　　要：Red soil,the most critical soil resource in tropical/subtropical regions worldwide,faces tremendous threats,including nutrient deficiency,acidification,and heavy metal contamination.There is a great demand for multifunctional eco-materials capable of modifying this situation.Herein,we used widely distributed soil and biomass to develop a zeolite/biochar composite for synergistic red soil remediation and amendment.With the composite material,the Pb^(2+) and Cd^(2+) remediation efficiencies reached 92.8%and 92.9%,respectively,in stems under optimal conditions.Moreover,the acidity and nutrient deficiency conditions of red soil significantly improved.The atomic-scale interaction mechanism during the remediation and amendment process was elucidated with complementary characterization methods,which revealed that in the zeolite/biochar composite material,zeolite contributes to longterm heavy metal remediation effects.Simultaneously,biochar is responsible for soil quality amendment and short-term heavy metal remediation.Furthermore,for the first time,single-atom heavy metal ions were observed on biochar during the remediation process,indicating the broad distribution of single atoms in the natural environment.

关 键 词：Red soil Heavy metal pollution Zeolite/biochar composite Soil remediation Soil amendment 

分 类 号：X53[环境科学与工程—环境工程]