Removal of Cd2+, Cu2+, Pb2+, and Ni2+ by sludge produced from liquid crystal display glass substrate

被引：2
|
作者：
Hong, S-H [1 ]
Lee, C-G [2 ]
Park, S-J [1 ,3 ]
机构：
[1] Hankyong Natl Univ, Dept Integrated Syst Engn, Anseong 17579, South Korea
[2] Ajou Univ, Dept Environm & Safety Engn, Suwon 16499, South Korea
[3] Hankyong Natl Univ, Dept Bioresources & Rural Syst Engn, Anseong 17579, South Korea
来源：
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY | 2022年 / 19卷 / 08期
基金：
新加坡国家研究基金会;
关键词：
Adsorption; Recycling; Heavy metal; Liquid crystal display; Sludge; HEAVY-METAL REMOVAL; SEWAGE-SLUDGE; AQUEOUS-SOLUTION; COMPETITIVE ADSORPTION; WASTE-WATER; SORPTION; IONS; NANOPARTICLES; BIOSORPTION; ADSORBENT;
D O I：
10.1007/s13762-021-03623-5
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Sludge produced from liquid crystal display glass substrate (LCD-sludge) was used as an alternative treatment medium for the removal of heavy metals (Cd2+, Cu2+, Pb2+, and Ni2+) from aqueous solutions via adsorption. The elemental composition of the LCD-sludge obtained by X-ray fluorescence showed that it was mainly composed of CeO2 (26.48%), CaO (23.92%), and SiO2 (6.86%). The kinetic adsorption of Cd2+, Cu2+, Pb2+, and Ni2+ on the LCD-sludge showed that equilibrium adsorption was reached within 12 h. The maximum adsorption amounts of Cd2+, Cu2+, Pb2+, and Ni2+ on the LCD-sludge were 1.29, 8.50, 8.47, and 3.02 mg/g, respectively. The adsorption data at equilibrium for all the heavy metals were better fitted to the Freundlich than the Langmuir model. Heavy metal adsorption by the LCD-sludge was an endothermic and involuntary reaction. The effects of other cations on heavy metal removal by the LCD-sludge followed the order of Al3+ > Ca2+ > Na+. As the LCD-sludge dose was increased, the removal percentage of Cd2+, Cu2+, and Pb2+ increased, but the adsorption amount per unit mass decreased. The results suggest that LCD-sludge can be used as an adsorbent for the removal of mixed heavy metals from aqueous solutions.
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页码：6971 / 6980
页数：10
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