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Preparation and application of amorphous Fe-Ti bimetal oxides for arsenic removal

机译：无定形Fe-Ti双金属氧化物的制备与应用砷去除

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摘要

A series of Fe-Ti bimetal oxides for As(III) and As(V) removal were synthesized through a co-precipitation method. Various techniques including BET surface area measurement, XRD, SEM and TEM were used to characterize the synthesized Fe-Ti bimetal oxides. Comparison results indicated that the bimetal oxide with a Fe : Ti molar ratio of 0.8 : 0.2 showed the best performance in As(III) removal, and the maximal adsorption capacity of As(III) and As(V) were 111.37 mg g~1 and 31.42 mg g~1 at pH 7, respectively. The two-compartment first-order model has been proven more appropriate than other models for fitting As(III) and As(V) adsorption kinetics. Two domains (i.e., fast and slow compartments) controlled the adsorption of arsenic at different contact times. The adsorption isotherms of As(III) and As(V) could be well described by the Freundlich and Langmuir models. The maximum adsorption amount of As(III) occurred at pH 9.2, and adsorption amount of As(V) decreased with increasing pH of solution. The ionic strength showed little effect on As(III) adsorption, while the adsorption amount of As(V) tended to increase with increasing ionic strength, indicating that As(III) and As(V) adsorption are specific adsorption. The coexisting sulfate and bicarbonate had little effect on arsenic removal, however the presence of phosphate inhibited arsenic removal significantly. The synthesized bimetal oxide was chemically stable throughout pH 4-9 and reusable.
机译：通过共沉淀法合成了一种（III）和作为（v）除去的一系列Fe-Ti二金属氧化物。包括BET表面积测量，XRD，SEM和TEM的各种技术用于表征合成的Fe-Ti双金属氧化物。比较结果表明，具有0.8：0.2的Fe：Ti摩尔比的双金属氧化物显示为（III）的最佳性能，以及AS（III）的最大吸附容量为111.37mg g〜1 PH 7分别在31.42mg g〜1。两厢一阶模型已被证明比其他拟合（iii）和（v）吸附动力学的其他模型更合适。两个域（即，快速和慢速隔室）控制在不同接触时间的砷的吸附。 As（iii）和As（v）的吸附等温物可以通过Freundlich和Langmuir模型很好地描述。在pH 9.2时发生的最大吸附量为（III），随着溶液的pH值增加，AS（V）的吸附量降低。离子强度显示出对As（iii）吸附的影响很小，而As（v）的吸附量往往随着离子强度的增加而增加，表明为（iii）和（v）吸附是特异性的吸附。共存硫酸盐和碳酸氢盐对砷的去除几乎没有影响，但是磷酸盐的存在明显抑制砷去除。在PH 4-9的合成二氧化碳氧化物中在化学稳定并可重复使用。

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  • 来源
    《RSC Advances》 |2015年第109期|共7页
  • 作者

    Pinhua Rao; Zhaowei Sun; Wenqi Zhang;

  • 作者单位

    School of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai 201620 China;

    School of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai 201620 China;

    School of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai 201620 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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