Efficient Adsorption of Tl(I) from Aqueous Solutions Using Al and Fe-Based Water Treatment Residuals

被引：2
作者：
Xu, Youze [1 ]
Qing, Yingjun [1 ,2 ]
Gu, Ruimin [1 ]
Zhou, Shuang [1 ]
Fu, Guangyi [1 ]
Zhao, Yuanyuan [1 ]
机构：
[1] Hunan Res Acad Environm Sci, Key Lab Water Pollut Control Technol, Changsha 410004, Peoples R China
[2] Xiangtan Univ, Coll Environm & Resources, Dept Environm, Xiangtan 411105, Peoples R China
来源：
PROCESSES | 2022年 / 10卷 / 12期
关键词：
adsorption; thallium; Al-WTR; Fe-WTR; wastewater treatment; HEAVY-METALS; WASTE-WATER; THALLIUM; REMOVAL; SORPTION; DRINKING; SOILS; PHOSPHORUS; BEHAVIOR; MERCURY;
D O I：
10.3390/pr10122700
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Iron and aluminum water treatment residuals from a water supply plant were used as adsorbents for Tl(I) to treat thallium-containing Tl(I) wastewater and realize the resource utilization of water treatment residuals. The feasibility study results showed that Fe-WTR and Al-WTR reached adsorption equilibria within 120 min. The Langmuir model showed maximum adsorption capacities of Tl(I) on Fe-WTR and Al-WTR as 3.751 and 0.690 mg g(-1) separately at an initial concentration of 5 mg L-1. The adsorption capacities of Fe-WTR and Al-WTR positively correlated with pH. The removal of Tl(I) using Fe-WTR exceeded Al-WTR; the adsorbed Tl(I) in Fe-WTR occurred primarily in the reduced state, while the Tl(I) adsorbed in Al-WTR was mainly in acid-extractable and reduced states. FTIR and XPS data showed that Tl(I) and Fe/Al-OH-functional groups formed stable surface complexes (Fe/Al-O-Tl) during adsorption, and there was no redox reaction. This confirmed that WTR is a highly efficient adsorbent for the stable removal of Tl(I), which provides a practical foundation for industrial application in Tl(I)-containing wastewater treatment.
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页数：17
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