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Adsorption and Reduction of Aqueous Cr by FeS-Modified Fe-Al Layered Double Hydroxide

Author

Listed:
  • Shuangshuang Zhang

    (School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China)

  • Wenhui Zhang

    (School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China)

  • Yazhen Wan

    (School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China)

Abstract

To remedy the widespread chromium (Cr) pollution in the environment, this study mainly used the ultrasonic-assisted co-precipitation and precipitation methods to prepare FeS-modified Fe-Al-layered double hydroxide (FeS/LDH) composite material. The experimental results showed that FeS/LDH has higher removal efficiency of Cr in aqueous solution and stronger anti-interference ability than unmodified LDH. Under the same reaction conditions, the removal efficiency of total Cr(Cr(T)) using LDH was 34.85%, and the removal efficiency of Cr(VI) was 46.76%. For FeS/LDH, the removal efficiency of Cr(T) and Cr(VI) reached 99.57% and 100%, respectively. The restoration of Cr(T) and Cr(VI) by FeS/LDH satisfied the Langmuir adsorption isotherm. The maximum adsorption capacity of Cr(T) and Cr(VI) achieved 102.9 mg/g and 147.7 mg/g. The efficient removal of Cr by FeS/LDH was mainly based on the triple synergistic effect of anion exchange between Cr(VI) and interlayer anions, redox of Cr(VI) with Fe 2+ and S 2− , and co-precipitation of Fe 3+ and Cr 3+ .

Suggested Citation

  • Shuangshuang Zhang & Wenhui Zhang & Yazhen Wan, 2021. "Adsorption and Reduction of Aqueous Cr by FeS-Modified Fe-Al Layered Double Hydroxide," Sustainability, MDPI, vol. 14(1), pages 1-12, December.
    • Handle: RePEc:gam:jsusta:v:14:y:2021:i:1:p:21-:d:707429
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