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| Adsorption study of heavy metals in simulated water by sludge biochar modified with attapulgite materials |
| Received:December 24, 2024 |
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| KeyWord:sludge;biochar;attapulgite;alkali modification;heavy metals |
| Author Name | Affiliation | E-mail | | TAO Ling | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Ministry of Education Engineering Research Center of Water Resource Comprehensive Utilization in Cold and Arid Regions, Lanzhou 730070, China
Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China
Gansu Hanxing Environmental Protection Co., Ltd., Lanzhou 730070, China | | | XIAO Yiran | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | REN Hanru | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Gansu Hanxing Environmental Protection Co., Ltd., Lanzhou 730070, China | | | LI Yunmeng | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | MU Xuri | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | ZHU Rui | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | TONG Caili | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | | GAO Min | Ningxia Normal University, Guyuan 756099, China | | | REN Jun | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Ministry of Education Engineering Research Center of Water Resource Comprehensive Utilization in Cold and Arid Regions, Lanzhou 730070, China
Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China
Gansu Hanxing Environmental Protection Co., Ltd., Lanzhou 730070, China | renjun@mail.lzjtu.cn |
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| Abstract: |
| To properly treat municipal sludge and improve the performance of biochar adsorbent for the adsorption of various heavy metals. Sludge biochar modified with attapulgite materials was prepared by pyrolysis using sludge and attapulgite as raw materials. The adsorption performance of the modified materials for Cd2+, Cr3+, Zn2+ and Ni2+ in simulated water was investigated. The results showed that when the mass ratio of sludge biochar to attapulgite was 2∶1, pH was 5, the addition amount was 1 g·L-1, and the concentration of the four heavy metals of 10.0 mg·L-1, the removal of Cd2+, Cr3+, Zn2+ and Ni2+ by the modified material was 83%, 87%, 89% and 88%, respectively. The adsorption processes of Cd2+, Cr3+, Zn2+ and Ni2+ by modified materials followed the quasi first order kinetic model and Langmuir model. The adsorption mechanism of the modified materials on heavy metals was determined by characterization means such as scanning electron microscope, X-ray diffraction and infrared spectroscopy. It mainly consists of pore filling, complexation of oxygen-containing functional groups, heavy metal-π electronic interactions, ion-exchange of Na+ and co-precipitation of silicates and CO32-. In this study, the sludge biochar modified with attapulgite prepared presented excellent adsorption for the removal of multiple heavy metals, which provides a new idea for the study of simultaneous removal of multiple heavy metals in water bodies and the utilization of sludge. |
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