4.4 Article

Removal of manganese by adsorption onto newly synthesized TiO2-based adsorbent during drinking water treatment

期刊

ENVIRONMENTAL TECHNOLOGY
卷 44, 期 9, 页码 1322-1333

出版社

TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2021.2000042

关键词

Adsorption; ion-exchange; manganese; titanium dioxide; drinking water treatment

向作者/读者索取更多资源

This study investigated an alternative method of demanganization using a newly synthesized TiO2-based adsorbent. The adsorbent showed high effectiveness in removing Mn2+ due to its unique characteristics. The adsorption process involves electrostatic interactions and ion-exchange. The optimal pH for Mn2+ removal was found to be 7. Different isotherm models were selected based on the presence of different ions.
Manganese is naturally present in water, but its increased concentration in potable water is undesirable for multiple reasons. This study investigates an alternative method of demanganization by a newly synthesized TiO2-based adsorbent prepared through the transformation of titanyl sulphate monohydrate to amorphous sodium titanate. Its adsorption capacity for Mn2+ was determined, while a range of influential factors, such as the effect of contact time, adsorbent dosage, pH value, and added ions was evaluated. The adsorbent appeared highly effective for Mn2+ removal owing to its unique characteristics. Besides adsorption via electrostatic interactions, ion-exchange was also involved in the Mn2+ removal. Although the Mn2+ removal occurred within the whole investigated pH range of 4-8, the maximum was achieved at pH 7, with q(e) = 73.83 mg g(-1). Equilibrium data revealed a good correlation with Langmuir isotherm in the absence of any ions or in the presence of monovalent co-existing ions, while the results in the presence of divalent co-existing ions showed a better fit to Freundlich isotherm. Additionally, the presence of monovalent cations (Na+, K+) only slightly decreased the Mn2+ removal efficiency as compared to divalent cations (Ca2+, Mg2+) that caused a greater decrease; however, the effect of anions (Cl-, SO42-) was insignificant. To provide insight into the adsorbent safety, the toxicity assessment was performed and showed no harmful effect on cell activity. Furthermore, the residual concentration of titanium after adsorption was always below the detection limit. The results imply that the synthesized TiO2-based adsorbent is a safe promising alternative method for demanganization.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.4
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据