Qualitative and quantitative analysis for Cd2+removal mechanisms by biochar composites from co-pyrolysis of corn straw and fly ash

被引:13
作者
Liu, Bingxiang [1 ,2 ]
Zhang, Zihang [1 ]
Guan, Dong-Xing [3 ]
Wang, Bing [4 ]
Zhou, Shaoqi [4 ]
Chen, Tong [1 ]
Wang, Jintao [1 ]
Li, Yucheng [1 ]
Gao, Bo [5 ]
机构
[1] Anhui Univ, Sch Resources & Environm Engn, Hefei 230601, Peoples R China
[2] Anhui Univ, Anhui Prov Key Lab Wetland Ecosyst Protect & Resto, Hefei 230601, Peoples R China
[3] Zhejiang Univ, Inst Soil & Water Resources & Environm Sci, Coll Environm & Resource Sci, Hangzhou 310058, Peoples R China
[4] Guizhou Univ, Coll Resources & Environm Engn, Guiyang 550025, Peoples R China
[5] China Inst Water Resources & Hydropower Res, Lab Simulat & Regulat Water Cycle River Basin, Beijing 100038, Peoples R China
基金
中国国家自然科学基金;
关键词
Functionalized biochar composite; Solid wastes; Cadmium; Quantitative adsorption mechanisms; Water treatment; Column experiment; AQUEOUS-SOLUTION; SORPTION MECHANISMS; HEAVY-METALS; REMOVAL; ADSORPTION; SILICON; TEMPERATURE; IMPROVEMENT; CARBON; BORON;
D O I
10.1016/j.chemosphere.2023.138701
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Removal of heavy metals (e.g., Cd) from contaminated water using waste-converted adsorbents is promising, but the efficiency still needs to be improved. Here, we prepared a functional biochar composite as novel Cd adsorbents by co-pyrolysis of two typical solid wastes, i.e., agricultural corn straw and industrial fly ash. The adsorption behavior and mechanism were investigated using batch and column adsorption experiments and modern charac-terization techniques. Results showed that alkali-modified fly ash (AMFA) was loaded onto the surface of the corn straw biochar as some fine particle forms, with quartz (SiO2) and silicate being the main mineral phases on the surface. The maximum sorption capacity fitted by Langmuir model for functionalized biochar composite (FBC700) was up to 137.1 mg g-1, which was 7.7 times higher than that of the original corn straw biochar (BC700). Spec-troscopic analysis revealed that adsorption mechanisms of Cd onto the FBC700 included mainly precipitation and ion exchange, with complexation and Cd-pi interaction also contributing. The AMFA could effectively improve the mineral precipitation with Cd. The adsorption columns filled with FBC700 exhibited a longer breakthrough time than that filled with BC700. The adsorption capacity calculated by Thomas model for FBC700 was also approxi-mately 6.0 times higher than that for BC700, showing that FBC700 was more suited to practical applications. This study provided a novel perspective for recycling solid wastes and treating Cd-contaminated water.
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页数:10
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