Hydrothermal synthesis of a magnetic adsorbent from wasted iron mud for effective removal of heavy metals from smelting wastewater

被引：38

作者：

Zhu, Suiyi ^{[1
,2
]}

Dong, Ge ^{[1
,2
]}

Yu, Yang ^{[1
,2
,3
]}

Yang, Jiakuan ^{[4
]}

Yang, Wu ^{[1
,2
]}

Fan, Wei ^{[1
]}

Zhou, Dandan ^{[1
,2
]}

Liu, Jiancong ^{[1
,2
]}

Zhang, Leilei ^{[1
,2
]}

Huo, Mingxin ^{[1
,2
]}

Wang, Yi ^{[2
]}

机构：

[1] Northeast Normal Univ, Sci & Technol Innovat Ctr Municipal Wastewater Tr, Changchun 130117, Jilin, Peoples R China

[2] Northeast Normal Univ, Engn Lab Water Pollut Control & Resources Recover, Changchun 130117, Jilin, Peoples R China

[3] Jilin Jianzhu Univ, Minist Educ, Key Lab Songliao Aquat Environm, Changchun 130117, Jilin, Peoples R China

[4] Huazhong Univ Sci & Technol, Sch Environm Sci & Engn, Wuhan 430074, Hubei, Peoples R China

来源：

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2018年 / 25卷 / 23期

基金：

中国国家自然科学基金;

关键词：

Groundwater plant; Iron mud; Hydrothermal synthesis; Maghemite; Heavy metals; Smelting wastewater; RED MUD; AQUEOUS-SOLUTION; COMPETITIVE ADSORPTION; EFFICIENT ADSORPTION; FERRIC-OXIDE; CU(II); TRANSFORMATION; REDUCTION; SURFACE; ZN(II);

D O I：

10.1007/s11356-018-2378-3

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A magnetic adsorbent (MA) was synthesized from wasted iron mud of a groundwater treatment plant using a novel one-step hydrothermal method. The results showed that Fe content of MA was 41.8 wt%, 2.5 times higher than that of iron mud, which was caused by hydrothermal dissolution of non-ferrous impurities under alkaline condition, such as quartz and albite, regardless of addition of ascorbic acid or not. Ferrihydrite was 92.7% in dry iron mud before adding ascorbic acid and gradually decreased to 58.1% by increasing the molar ratio of ascorbic acid to Fe following hydrothermal treatment. The strongest saturation magnetization of 16.29 emu/g was observed in the prepared MA-4 when the ascorbic acid to Fe molar ratio was 1. The highest surface site concentration of 1.31 mmol/g was observed in MA-2 when the ratio was 0.02. The mechanism of hydrothermal conversion of wasted iron mud to MA was reductive dissolution of ferrihydrite to form siderite, which was then reoxidized to maghemite. When 12.5 g/L of MA-2 was applied to treat smelting wastewater, over 99% removal of Cu2+, Zn2+, Pb2+, and Cd2+ was achieved. The major mechanisms of Cu2+ and Zn2+ adsorption by the adsorbent were cationic exchange.

引用

页码：22710 / 22724

页数：15

共 68 条

[1] Competitive adsorption of copper and zinc by a Bt horizon of a savanna Alfisol as affected by pH and selective removal of hydrous oxides and organic matter [J].