化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (4) : 239-243.

开发与应用

磁性Fe₃O₄/改性煤渣复合材料的制备及其对Cr⁶⁺的吸附性能研究

作者信息 +

Preparation of magnetic Fe₃O₄/modified cinder composite and adsorption property for Cr⁶⁺

Peng Juan, Zhang Huijia, Zheng Wanying, Gao Zuoning

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Received		Published
2017-05-25		2018-04-20
Issue Date	Revised Date
2018-05-17	2017-05-25

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摘要

以盐酸浸泡锅炉房的废弃煤渣即改性煤渣为前驱体,采用溶剂热法制备了磁性四氧化三铁(Fe₃O₄)/改性煤渣复合材料,采用扫描电子显微镜(SEM)、X射线粉末衍射(XRD)、X射线光电子能谱仪(XPS)、傅里叶红外光谱仪(FT-IR)和物理吸附仪(BET)等对复合材料进行了表征分析。用磁性Fe₃O₄/改性煤渣复合材料作为吸附剂吸附Cr⁶⁺,并考察了吸附剂用量、吸附时间、Cr⁶⁺溶液的初始pH和初始浓度对材料吸附性能的影响。结果表明,在吸附剂用量为1.5g,吸附时间为30min,Cr⁶⁺溶液的初始pH=3.00的条件下,吸附效果最好。动力学分析可知,磁性Fe₃O₄/改性煤渣复合材料对Cr⁶⁺溶液的吸附符合准二级动力学方程,连续进行5次吸附/再生循环后,材料的吸附率均在90%以上,表明其具有较好的循环可再生性,同时Fe₃O₄本身具有的磁性可用于废水处理过程的快速分离。

Abstract

The waste cinder in boiler room was modified by HCl.Fe₃O₄/modified cinders were prepared by in-situ hydrothermal method.SEM,XRD,XPS,FT-IR and BET were used to characterize the microstructure and chemical composition.The effects of the adsorbent amount,adsorption time,pH value and the initial concentration of Cr⁶⁺ solution on the adsorptive capacity of Cr⁶⁺ were investigated.The results showed that the optimum conditions for the adsorption reaction were the adsorbent amount was 1.5g,the adsorption time 30min,and pH value of Cr⁶⁺ solution was 3.00.The adsorption of Cr⁶⁺ on Fe₃O₄/modified cinder was more consistent with pseudo-second-order kinetics.After 5 successive adsorption/regeneration cycles,the adsorption rate of adsorbent was more than 90%.Fe₃O₄/modified cinder had better regeneration potential.And the magnetic properties of iron oxide itself were embodied in the separation of the composite material easily and after treatment.

关键词

改性煤渣 / 磁性 / Fe₃O₄ / Cr⁶⁺

Key words

modified cinder / magnetism / Fe₃O₄ / Cr⁶⁺

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磁性Fe₃O₄/改性煤渣复合材料的制备及其对Cr⁶⁺的吸附性能研究[J]. 化工新型材料, 2018, 46(4): 239-243 DOI:

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