Adsorption of arsenic from aqueous solution using a zero-valent iron material modified by the ionic liquid [Hmim]SbF6. Issue 12 (9th February 2021)

• Record Type: Journal Article
• Authors: Wu, Fenghui; Zhao, Chenyang; Qu, Guangfei; Yan, Zhoupeng; Zeng, Yingda; Chen, Bangjin; Hu, Yinghui; Ji, Wei; Li, Yingli; Tang, Huimin
• Is Part Of: RSC advances. Volume 11:Issue 12(2021)
• Page Start: 6577
• Page End: 6585
• Publication Date: 2021-02-09
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra09339d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The environmental and health impacts caused by arsenic (As) in wastewater make it necessary to carefully manage As wastes. Abstract : The environmental and health impacts caused by arsenic (As) in wastewater make it necessary to carefully manage As wastes. In the present work, a composite of the ionic liquid [Hmim]SbF6 and nano-iron (H/Fe) was used as an adsorbent to remove As(v ) from aqueous solution. To better understand the removal effect of H/Fe on As(v ) in aqueous solution, the reaction parameters of pH, reaction temperature, time and H/Fe dosage were systematically analyzed in detail. The results show that H/Fe has significant removal efficiency toward As(v ), and that the adsorption of As(v ) by 0.5 g H/Fe reaches its maximum adsorption capacity within 2 h. The adsorption of As(v ) on H/Fe is a non-linear, time-varying process. The initial adsorption reaction is fast; however, unlike at the beginning, the later reaction involves sustained slow absorption, resulting in a distinct two-phase adsorption characteristic. Redox reaction may be one of the mechanisms responsible for the slow adsorption of As(v ) on H/Fe. At the same time, the As(v ) removal effect of H/Fe is greatly restricted by the pH. Electrostatic adsorption, adsorption co-precipitation and redox reactions act together on H/Fe in the As(v ) removal process. This study provides a basis for further clarifying the adsorption, adsorption rules and mechanism of As(v ) on H/Fe and a feasible method for the improvement of As(v ) removal efficiency of zero-valent iron materials.