Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 504, Issue -, Pages 669-679Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.06.020
Keywords
ZnO monolith; Adsorption; Pesticide; Dyes; Isotherm and kinetics
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Funding
- BRNS-DAE, India [34/14/63/2014]
- DST-SERB [SB/FT/CS-178/2013]
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Removal of toxic effluents (like dyes and pesticides) by cost-effective and user-friendly method is needed to provide sustaining the environment for civilization. Here, low-cost mesoporous silica monolith (SiO2) and silica supported metal-oxide (ZnO@SiO2) monolith were synthesized to reduce the solemn impact of toxic effluents. Batch experiments were performed to remove Alizarin (AZ), Paradol (PD), Acid blue-113 (AB) and Rhodamine-B (RD) from aqueous solution via synthesized monoliths. The influence of various parameters (like pH, contact time, temperature and adsorbate concentration) has been optimized. The maximum adsorption capacity of ZnO@SiO2 monolith is 625, 500, 714 and 555 mg/g for AZ, RD, AB, and PD respectively. The adsorption for AZ, PD, AB, and RD is spontaneous and exothermic. The adsorption process can be well described by the pseudo-second-order kinetic model (high regression coefficients) and the Freundlich isotherm model (R-2 = 0.97-0.99). (C) 2017 Elsevier Inc. All rights reserved.
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