Enhanced Adsorption of Cu2+ from Aqueous Solution by Sludge Biochar Compounded with Attapulgite-Modified Fe
Author:
Wang Ruoan1, Ren Jun12, Ren Hanru12, Tao Ling12, Wu Chaohui1, Sun Xinni1, Lv Mairong3
Affiliation:
1. Faculty of Environment and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China 2. Gansu Hanxing Environmental Protection Technology Co., Ltd., Lanzhou 730070, China 3. Faculty of Chemistry and Chemical Engineering, Ningxia Normal University, Guyuan 756099, China
Abstract
Three types of modified sludge biochar were produced for the adsorption of copper in aqueous solutions via the calcium-based magnetic (CaCO3, Fen+) treatment (CA–BC), nanozero-valent iron (nZVI) treatment (nZVI–BC), and iron (Fe3+) treatment (FA–BC) of raw biochar. The results suggested that the adsorption capacity for Cu2+ of calcium-based magnetic attapulgite/sludge biochar (CA–BC) prepared from CaCO3, FeCl3, and FeSO4 is 38.01% greater than that of unmodified biochar and 6.41% to 17.5% greater than that of the other biochar. The CA-BC contained a variety of ferrite-containing and hydroxide-functional groups, as well as a more developed pore structure. The existence of H+ reduced the adsorption capacity of the biochar for Cu2+. A high initial concentration of Cu2+ could increase Cu2+ adsorption on CA–BC. Combined with theoretical calculations, the adsorption efficiency of CA–BC in different systems was explored. The results revealed that CA–BC achieved a maximum removal rate of 92.644% at a pH of 6 with a reaction time of 157 min and an initial Cu2+ concentration of 2.813 mg/L. These results suggest that CA–BC shows great potential for removing Cu2+ from aqueous solutions.
Funder
Gansu Provincial Education Department Industry Support Plan Project Science and Technology Plan Project of Gansu Provincial Science and Technology Department Special Project of Gansu Science and Technology Commissioner Gansu Key Research and Development programs Natural Science Foundation Project of Ningxia Province
Subject
Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry
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