title: Enhanced Arsenate Removal Performance in Aqueous Solution by Yttrium-Based Adsorbents.
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.
authors.affiliation: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, 123, Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Korea. ddlee19@gist.ac.kr.
authors.forename: Sang-Ho
authors.initials: SH
authors.lastname: Lee
authors.affiliation: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, 123, Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Korea. kwkim@gist.ac.kr.
authors.forename: Kyoung-Woong
authors.initials: KW
authors.lastname: Kim
authors.affiliation: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, 123, Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Korea. btlee@gist.ac.kr.
authors.forename: Byung-Tae
authors.initials: BT
authors.lastname: Lee
authors.affiliation: Mine Reclamation Corporation, 2, Segye-ro, Wonju-si, Gangwon-do 26464, Korea. sbang@mireco.or.kr.
authors.forename: Sunbaek
authors.initials: S
authors.lastname: Bang
authors.affiliation: Energy Lab, Samsung Advanced Institute of Technology, 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Korea. hs13.kim@samsung.com.
authors.forename: Hyunseok
authors.initials: H
authors.lastname: Kim
authors.affiliation: Energy Lab, Samsung Advanced Institute of Technology, 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Korea. hr12.kang@samsung.com.
authors.forename: Hyorang
authors.initials: H
authors.lastname: Kang
authors.affiliation: School of Civil and Environmental Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Korea. amjang68@gmail.com.
authors.forename: Am
authors.initials: A
authors.lastname: Jang
mesh_terms: D000327:Adsorption; D001149:Arsenates / Q000737:chemistry*; D002254:Carbonates / Q000737:chemistry; D006878:Hydroxides / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D017550:Spectroscopy, Fourier Transform Infrared; D014025:Titanium / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D015019:Yttrium / Q000737:chemistry*
chemical_list: D001149:Arsenates; D002254:Carbonates; D006878:Hydroxides; D014874:Water Pollutants, Chemical; D015019:Yttrium; D014025:Titanium; C025657:arsenic acid
keywords: adsorption; arsenate removal; basic yttrium carbonate (BYC); maximum adsorption capacity; specific surface area; surface modification