Removal of Cd, Cu, Pb, and Ni by sludge produced from liquid crystal display glass substrate
International Journal of Environmental Science and Technology, ISSN: 1735-2630, Vol: 19, Issue: 8, Page: 6971-6980
2022
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Article Description
Sludge produced from liquid crystal display glass substrate (LCD-sludge) was used as an alternative treatment medium for the removal of heavy metals (Cd, Cu, Pb, and Ni) from aqueous solutions via adsorption. The elemental composition of the LCD-sludge obtained by X-ray fluorescence showed that it was mainly composed of CeO (26.48%), CaO (23.92%), and SiO (6.86%). The kinetic adsorption of Cd, Cu, Pb, and Ni on the LCD-sludge showed that equilibrium adsorption was reached within 12 h. The maximum adsorption amounts of Cd, Cu, Pb, and Ni 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 Al > Ca > Na. As the LCD-sludge dose was increased, the removal percentage of Cd, Cu, and Pb 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.
Bibliographic Details
Springer Science and Business Media LLC
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