首页|A review of functions and mechanisms of clay soil conditioners and catalysts in thermal remediation compared to emerging photo-thermal catalysis

A review of functions and mechanisms of clay soil conditioners and catalysts in thermal remediation compared to emerging photo-thermal catalysis

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A review of functions and mechanisms of clay soil conditioners and catalysts in thermal remediation compared to emerging photo-thermal catalysis
High temperatures and providing sufficient time for the thermal desorption of persistent organic pollutants(POPs)from contaminated clay soils can lead to intensive energy con-sumption.Therefore,this article provides a critical review of the potential additives which can improve soil texture and increase the volatility of POPs,and then discusses their en-hanced mechanisms for contributing to a green economy.Ca-based additives have been used to reduce plasticity of bentonite clay,absorb water and replenish system heat.In con-trast,non-Ca-based additives have been used to decrease the plasticity of kaolin clay.The soil structure and soil plasticity can be changed through cation exchange and flocculation processes.The transition metal oxides and alkali metal oxides can be applied to catalyze and oxidize polycyclic aromatic hydrocarbons,petroleum and emerging contaminants.In this system,reactive oxygen species(·O2-and·OH)are generated from thermal excitation with-out strong chemical oxidants.Moreover,multiple active ingredients in recycled solid wastes can be controlled to reduce soil plasticity and enhance thermal catalysis.Alternatively,the alkali,nano zero-valent iron and nano-TiN can catalyze hydrodechlorination of POPs under reductive conditions.Especially,photo and photo-thermal catalysis are discussed to accel-erate replacement of fossil fuels by renewable energy in thermal remediation.

Persistent organic contaminantsClay soilsThermal remediationSoil conditioningSynergistic catalysis

Juan Zhang、Shuo Wang、Xin Wang、Wentao Jiao、Minghua Zhang、Fujun Ma

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State Key Laboratory of Advanced Metallurgy,School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China

Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China

College of Agricultural and Environmental Sciences,University of California,Davis,CA 95616,USA

State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China

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Persistent organic contaminants Clay soils Thermal remediation Soil conditioning Synergistic catalysis

2025

10.1016/j.jes.2023.11.006

环境科学学报(英文版)
中科院生态环境研究中心

环境科学学报(英文版)

影响因子：0.862
ISSN：1001-0742
年,卷(期)：2025.147(1)