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- Title
Microwave-assisted preparation and characterization of organo-attapulgites and comparison for 1-naphthol removal: equilibrium, kinetic, and thermodynamic studies.
- Authors
Tai, Yanfang; Shi, Chunjie; Li, Guanghui; Wu, Jingmei
- Abstract
In this study, Na-attapulgite (Na-APT) was modified with octadecyl trimethyl ammonium chloride (OTMAC), sodium dodecyl sulfate (SDS), and the mixture of OTMAC and SDS using microwave-assisted technique. The prepared organo-attapulgites were characterized in detail. The combined analysis of characterizations indicated that surfactants were successfully introduced on the surfaces of attapulgite. A batch technique was adopted to investigate the removal efficiency of organo-attapulgites toward 1-naphthol under environmental conditions. The results showed that pseudo-second-order model and intraparticle diffusion model simulated the adsorption kinetic data better than that of pseudo-first-order model. The adsorption of 1-naphthol by organo-attapulgites fit reasonably well to Langmuir, Freundlich, and linear isothermal models. The negative values of ΔG° and ΔH° obtained from thermodynamic study indicated the spontaneous and exothermic nature of 1-naphthol adsorption on Na-APT and organo-attapulgites. Based on the experimental results, it could be deduced that the mechanism of 1-naphthol removal was a combination of surface adsorption and partitioning mechanism. The maximum adsorption capacity of organo-attapulgites for 1-naphthol was in the sequence of OTMAC/SDS-APT > OTMAC-APT > SDS-APT, which suggested that OTMAC/SDS-APT could be potentially used as a cost-effective material for the purification of actual organic contaminants-bearing effluents.
- Subjects
FULLER'S earth; NAPHTHOL; SEWAGE purification; SODIUM dodecyl sulfate; PHENOL removal (Sewage purification); ADSORPTION capacity; COMPARATIVE studies
- Publication
Desalination & Water Treatment, 2016, Vol 57, Issue 26, p12118
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2015.1048531