JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2014 Vol.15 No.8 P.671-680

Synthesis of flower-like α-Fe₂O₃ and its application in wastewater treatment*

Author(s): Kun Xie¹, Xiang-xue Wang², Zheng-jie Liu², Ahmed Alsaedi³, Tasawar Hayat³, Xiang-ke Wang^2,4
Affiliation(s): 1. Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Chongqing 404100, China; more
Corresponding email(s): xkwang@ipp.ac.cn
Key Words: Flower-like &alpha, -Fe₂O₃ , Arsenate, Sorption, Methylene blue (MB), Photodegradation

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Abstract: The removal of arsenic from aqueous solution is crucial to human health and environmental pollution. Herein, flower-like α-Fe₂O₃ nanostructures were synthesized via a template-free microwave-assisted solvothermal technique, and were applied as adsorbents for the removal of arsenic (As(V)) from aqueous solutions. The results indicated that the synthesized flower-like α-Fe₂O₃ showed excellent sorption properties and had a maximum sorption capacity of 47.64 mg/g for As(V). Meanwhile, the experimental results of photodegradation of methylene blue (MB) indicated that the as-synthesized flower-like α-Fe₂O₃ exhibited very high photocatalytic performance for the photodegradation of MB and that the as-obtained flower-like α-Fe₂O₃ nanostructures were suitable materials in wastewater treatment.

花状氧化铁的制备及其在废水处理中的应用

研究目的：研究花状氧化铁的制备并探讨其对砷的吸附性能和亚甲基蓝的催化性能。
创新要点：1.合成了花状氧化铁；2.发现Langmuir模型能更好地模拟砷的吸附过程；3.发现花状氧化铁对亚甲基蓝有很好的催化降解性能。
研究方法：1.使用扫描电镜、投射电镜、X射线衍射和BET比表面及孔径分析仪对合成的花状氧化铁进行表征；2.采用静态实验法研究砷的吸附性能及亚甲基蓝的催化行为。
重要结论：1.采用一种低成本的溶剂热法合成了花状氧化铁；2.合成的花状氧化铁有着较大的比表面积并对砷有着很好的吸附性能，并且吸附率随着pH的增加而降低。同时发现Langmuir模型能更好地模拟砷的吸附过程；3.亚甲基蓝的初始浓度和花状氧化铁的用量对催化性能影响较为明显，花状氧化铁有较好的重复利用性；4.合成的花状氧化铁可以应用于大批废水的处理。
花状氧化铁；砷；吸附；亚甲基蓝；光降解

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花状氧化铁的制备及其在废水处理中的应用

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