期刊
ENVIRONMENTAL RESEARCH
卷 204, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2021.112070
关键词
Calcium oxide; Naphthalene; Hydroxyl; Isotherm; Regeneration
资金
- King Saud University, Riyadh, Saudi Arabia [RSP-2021/201]
The study evaluated the adsorptive nature of calcium oxide nanoparticles in an aqueous sample of naphthalene in the presence of Ca2+ ions, showing enhanced regeneration efficiency with the aid of calcium chloride. The positive influence of adding Ca2+ ions into the naphthalene solution for rapid adsorption was elucidated, indicating a probable increase in sorption capacity at lower concentrations.
The adsorptive nature of calcium oxide nanoparticles in aqueous sample of naphthalene in presence of Ca2+ ions was estimated. Enhanced efficiency of calcium oxide regeneration (90%) with the aid of calcium chloride in the solution concentration of 0.002-0.1 M was depicted. The less degree of toxic naphthalene desorption merged with SEM, FTIR and XRD characterization data portrays the importance of naphthalene adsorption onto calcium oxide using calcium chloride for regeneration. Batch adsorption studies were performed to evaluate the operating parameters such as pH, naphthalene concentration, contact time and impact of Ca2+ on naphthalene study. The adsorption isotherm of naphthalene on calcium oxide nanoparticle was described by Langmuir, Freundlich, Temkin and Dubinin Radushkevich and theoretical maximum monolayer adsorption capacity was found to be 63.81 mg/g at 303 K. The adsorption kinetic best fitted with pseudo second order kinetic model. The positive influence of making the addition of Ca2+ ions into naphthalene solution for its rapid adsorption was elucidated which is leaded by a probable increase in sorption capacity for naphthalene molecules at lower concentrations. The stable nature of crystallinity of calcium oxide and a less degree of naphthalene molecules leaching during consecutive cycles of adsorptive process and nanoparticle regeneration was also scrutinized.
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