Valorization of manganese-containing groundwater treatment sludge by preparing magnetic adsorbent for Cu(II) adsorption 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Journal of Environmental Management
年/卷/期
2019 / 236 /
页码
446-454
ISSN号
0301-4797
作者单位
Northeast Normal Univ, Sci & Technol Innovat Ctr Municipal Wastewater Tr, Changchun 130117, Jilin, Peoples R China;Northeast Normal Univ, Sci & Technol Innovat Ctr Municipal Wastewater Tr, Changchun 130117, Jilin, Peoples R China;Northeast Normal Univ, Sci & Technol Innovat Ctr Municipal Wastewater Tr, Changchun 130117, Jilin, Peoples R China;Northeast Normal Univ, Sci & Technol Innovat Ctr Municipal Wastewater Tr, Changchun 130117, Jilin, Peoples R China;Northeast Normal Univ, Sci & Technol Innovat Ctr Municipal Wastewater Tr, Changchun 130117, Jilin, Peoples R China;Northeast Normal Univ, Sci & Technol Innovat Ctr Municipal Wastewater Tr, Changchun 130117, Jilin, Peoples R China;Northeast Normal Univ, Sci & Technol Innovat Ctr Municipal Wastewater Tr, Changchun 130117, Jilin, Peoples R China;Huazhong Univ Sci & Technol, Sch Environm Sci & Engn, Wuhan 430074, Hubei, Peoples R China;Northeast Normal Univ, Sci & Technol Innovat Ctr Municipal Wastewater Tr, Changchun 130117, Jilin, Peoples R China;Northeast Normal Univ, Sci & Technol Innovat Ctr Municipal Wastewater Tr, Changchun 130117, Jilin, Peoples R China;
作者
Zhu, Suiyi;Lin, Xue;Dong, Ge;Yu, Yang;Bian, Dejun;Zhang, Lanhe;Yu, Hongbin;Yang, Jiakuan;Huo, Mingxin;Wang, Xianze;
摘要
Mn-containing sludge from groundwater treatment was converted to magnetic particles (MPs) via a one-step hydrothermal method using sodium ascorbate (SA) as the reductant. The MPs were characterized by X-ray diffraction spectroscopy, Mossbauer spectroscopy, X-ray fluorescence spectroscopy, magnetometry and Gran titration and the results showed that magnetic jacobsite was obtained as an intermediate product in transformation of Fe/Mn oxides to siderite and rhodochrosite. When the molar ratio of SA to Mn in the sludge was two, the produced MPs-2 contained a mixture of ferrihdyrite, hematite, jacobsite and Si/Al oxides, and could magnetize at 2.4 emu/g. Ferrihydrite content in MPs decreased with increase of the SA/Mn molar ratio, leading to decrease of the surface sites concentration (H-s). Thus, MPs-2 contained optimized H-s of 6.7 mmoL/g and a desirable adsorption capacity of Cu(II) (73.1 mg/g). The adsorption isotherms of MPs-2 on Cu(II) complied with the Langmuir model and the adsorption kinetics fitted well with the pseudo-second-order model. The major mechanism of adsorption was cationic exchange of the coordinated H and Na ions on MPs-2 surface sites with the Cu(II) ions. This study was the first time to report preparation of MPs by recycling Mn-containing sludge, which could be used as a high-capacity and low-cost adsorbent in treatment of heavy metal-containing wastewater.
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关键词/主题词
Mn-containing sludge;Hydrothermal process;Magnetic particles;Adsorption;Cationic exchange;
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