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Mechanistic insights into the leaching and environmental safety of arsenic in ceramsite prepared from fly ash

作     者:Song, Bing Liu, Zequan Li, Chengming Zhou, Shiji Yang, Linjun Chen, Zhiliang Song, Min 

作者机构:Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Jiangsu Nanjing210096 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing400044 China Department of Environmental Science College of Environment and Ecology Chongqing University Chongqing400045 China Jiangsu Province Engineering Research Center of Soil and Groundwater Pollution Prevention and Control Jiangsu Nanjing210036 China 

出 版 物:《Chemosphere》 (Chemosphere)

年 卷 期:2023年第344卷

页      面:140292页

核心收录:

学科分类:0830[工学-环境科学与工程(可授工学、理学、农学学位)] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 070203[理学-原子与分子物理] 0837[工学-安全科学与工程] 0703[理学-化学] 0714[理学-统计学(可授理学、经济学学位)] 0701[理学-数学] 0702[理学-物理学] 

基  金:This work was supported by the National Natural Science Foundation of China ( 52222609 and 52076043 ) 

主  题:Heavy metals 

摘      要:Utilizing fly ash to prepare ceramsite is a promising way to immobilize heavy metals and recycle industrial solid waste. However, traditional preparation method of fly ash ceramsite has the disadvantages of large ignition loss. Therefore, the present study applied the pressure molding method to enhance solid content and improve the strength of ceramsite. The optimal preparation conditions of ceramsite were suggested as preheating at 450 °C for 25 min followed by sintering at 1050 °C for 30 min. Under such conditions, ceramsite with high compressive strength of 10.8 Mpa, bulk density of 878 kg m−3, and 1-h water absorption of 18.5% was fabricated, in compliance with Chinese standard (GB/T 1743.1–2010). The arsenic leaching concentration from the resulting product was considerably lower than Chinese standard (GB 5085.3–2007). Moreover, arsenic volatilization during ceramsite calcination was insignificant, and the vast majority of arsenic remained in resulting ceramsite. A geochemical speciation model developed for the multiple component system in ceramsite suggested that FeAsO4, Ca5(OH) (AsO4)3, and hydrous ferric oxide adsorption are the primary mechanisms retaining arsenic in ceramsite. Additionally, based on density functional theory calculations and biotoxicity test, the binding site of arsenic atom on mineral components and the environmental safety of ceramsite was determined and evaluated. © 2023

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