Effectively uptake arsenate from water by mesoporous sulphated zirconia: Characterization, adsorption, desorption, and uptake mechanism

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• 作者：Caiyun Han ; Hang Liu ; Liuyi Zhang ; Jiushuai Deng and Yongming Luo
• 刊名：The Canadian Journal of Chemical Engineering
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：95
• 期：3
• 页码：543-549
• 全文大小：1618K
• ISSN：1939-019X

文摘

Mesoporous sulphated zirconia (MSZ), prepared by a facile one-step route, was characterized and served as arsenate adsorbent. The properties of MSZ were characterized by FTIR, N₂ adsorption-desorption isotherm, XRD, and TEM. It was found that SO₄²⁻ was successfully incorporated into the obtained mesoporous material. Additionally, arsenate adsorption performance was executed by batch experiments. From the results, it was found that adsorption equilibrium data were fitted well to Langmuir-Freundlich, and the maximum adsorption capacity was 99.23 mg/g at room temperature. The adsorption process obeyed pseudo-second-order under the investigated temperature, which indicated that “surface reaction” was the main rate-limiting step. The uptake performance was not influenced by initial pH for pH in the region of 2.0–10.0. Based on the results of FTIR and the value of adsorption energy, it was demonstrated that ion-exchange between arsenate species and sulphated groups was the dominant uptake mechanism. On this theory of uptake mechanism, 1.0 mol/L H₂SO₄ was successfully used to regenerate the spent MSZ. Arsenate removal percentage was still over 80 % after recycling the MSZ 3 times. These results indicated that MSZ possessed a potential application in treating arsenate-contaminated water.