MODIFICATION OF GEHLENITE CERAMSITE AND ITS TREATMENT EFFICIENCY ON MANGANESE-CONTAINING WASTEWATER

QIN Juan; YANG Shangwen; BAO Yuqing; WU Yujie; CAI Lin; WEN Qian

doi:10.13205/j.hjgc.202208006

Volume 40 Issue 8

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(8): 47-54

QIN Juan, YANG Shangwen, BAO Yuqing, WU Yujie, CAI Lin, WEN Qian. MODIFICATION OF GEHLENITE CERAMSITE AND ITS TREATMENT EFFICIENCY ON MANGANESE-CONTAINING WASTEWATER[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(8): 47-54. doi: 10.13205/j.hjgc.202208006

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QIN Juan, YANG Shangwen, BAO Yuqing, WU Yujie, CAI Lin, WEN Qian. MODIFICATION OF GEHLENITE CERAMSITE AND ITS TREATMENT EFFICIENCY ON MANGANESE-CONTAINING WASTEWATER[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(8): 47-54. doi: 10.13205/j.hjgc.202208006

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MODIFICATION OF GEHLENITE CERAMSITE AND ITS TREATMENT EFFICIENCY ON MANGANESE-CONTAINING WASTEWATER

doi: 10.13205/j.hjgc.202208006

Nantong Key Laboratory of Intelligent and New Energy Materials, School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China

Received Date: 2021-10-07
Publish Date: 2022-11-08

Abstract

Abstract

Gehlenite ceramsites were prepared through calcination, with industrial solid wastes lime mud and fly ash as the raw materials. Then, the ceramsites were modified by hydrothermal reaction of NaOH solution and finally applied to the adsorption of manganese-containing wastewater. The ceramsites before and after the modification were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), to explore the modification mechanism. Under different modification conditions, such as the concentration of NaOH solution and the temperature of the hydrothermal reaction, the adsorption efficiency of Mn²⁺ by the ceramsites was detected. Thus, the optimum modification conditions and the adsorption mechanism of Mn²⁺ were determined. The results showed that after modification, the main mineral phase of the ceramsites was still gehlenite, but a new phase, Ca(OH)₂ was generated because of the activation of the partial calcium element. Accordingly, the alkalinity of the ceramsites was increased, significantly improving the removal rate of Mn²⁺ and shortening the adsorption equilibrium time. The concentrations of NaOH solution of 4, 3 mol/L and the temperature of 160 ℃ were the optimum modification conditions of the two ceramsites, respectively. For the adsorption of Mn²⁺ by the modified ceramsites, the adsorption equilibrium was achieved at 10~15 min, and the removal rate was close to 100%. During the adsorption process, Mn²⁺ in solution was reacted with OH^- released from the ceramsites to form white Mn(OH)₂ and then quickly oxidized to brown MnO(OH)₂, which was evenly adsorbed on the surface of the ceramsites. This technology not only realized the utilization of solid wastes, but also achieved the purpose of Treating Waste with Waste.
- gehlenite,
- hydrothermal modification,
- concentration of NaOH,
- temperature,
- Mn²⁺ removal

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References(36)

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