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Int. J. Environ. Res. Public Health 2015, 12(10), 13523-13541; doi:10.3390/ijerph121013523

Enhanced Arsenate Removal Performance in Aqueous Solution by Yttrium-Based Adsorbents

1
School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, 123, Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Korea
2
Mine Reclamation Corporation, 2, Segye-ro, Wonju-si, Gangwon-do 26464, Korea
3
Energy Lab, Samsung Advanced Institute of Technology, 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Korea
4
School of Civil and Environmental Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Ravi Naidu and Mohammad Mahmudur Rahman
Received: 27 August 2015 / Revised: 8 October 2015 / Accepted: 19 October 2015 / Published: 26 October 2015
(This article belongs to the Special Issue Arsenic in Drinking Water: Current Perspectives and Future Directions)
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Abstract

Arsenic contamination in drinking water has become an increasingly important issue due to its high toxicity to humans. The present study focuses on the development of the yttrium-based adsorbents, with basic yttrium carbonate (BYC), Ti-loaded basic yttrium carbonate (Ti-loaded BYC) and yttrium hydroxide prepared using a co-precipitation method. The Langmuir isotherm results confirmed the maximum adsorption capacity of Ti-loaded BYC (348.5 mg/g) was 25% higher than either BYC (289.6 mg/g) or yttrium hydroxide (206.5 mg/g) due to its increased specific surface area (82 m2/g) and surface charge (PZC: 8.4). Pseudo first- and second-order kinetic models further confirmed that the arsenate removal rate of Ti-loaded BYC was faster than for BYC and yttrium hydroxide. It was subsequently posited that the dominant removal mechanism of BYC and Ti-loaded BYC was the carbonate-arsenate ion exchange process, whereas yttrium hydroxide was regarded to be a co-precipitation process. The Ti-loaded BYC also displayed the highest adsorption affinity for a wide pH range (3–11) and in the presence of coexisting anionic species such as phosphate, silicate, and bicarbonate. Therefore, it is expected that Ti-loaded BYC can be used as an effective and practical adsorbent for arsenate remediation in drinking water. View Full-Text
Keywords: adsorption; arsenate removal; basic yttrium carbonate (BYC); surface modification; specific surface area; maximum adsorption capacity adsorption; arsenate removal; basic yttrium carbonate (BYC); surface modification; specific surface area; maximum adsorption capacity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lee, S.-H.; Kim, K.-W.; Lee, B.-T.; Bang, S.; Kim, H.; Kang, H.; Jang, A. Enhanced Arsenate Removal Performance in Aqueous Solution by Yttrium-Based Adsorbents. Int. J. Environ. Res. Public Health 2015, 12, 13523-13541.

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