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Water 2017, 9(9), 651;

Preparation of a Thermally Modified Diatomite and a Removal Mechanism for 1-Naphthol from Solution

College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Xiangtan 411202, China
Pharmaceutical Sciences Laboratory, Faculty of Sciences and Engineering, Åbo Akademi University, FI-20520 Turku, Finland
School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China
School of Science & Sport, University of the West of Scotland, Paisley PA1 2BE, UK
Authors to whom correspondence should be addressed.
Received: 28 June 2017 / Revised: 11 August 2017 / Accepted: 28 August 2017 / Published: 30 August 2017
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The adsorption of 1-naphthol (NAP) in aqueous solution was investigated using unmodified and modified diatomite at different temperature, pH, adsorbent mass and contact time. The adsorption capacity of the modified diatomite significantly improved (about 2 times at 298 K) compared to the unmodified diatomite. The adsorption showed a good fit with the Langmuir model. The further data analysis demonstrated that the adsorption of 1-NAP on both materials could be best described by the pseudo second-order kinetic model. The thermodynamic parameters, including Gibbs’ free energy (ΔG), enthalpy (ΔH) and entropy changes (ΔS) were determined. It was observed that the ΔH values (less than 40 kJ/mol) was positive, which indicated that the adsorption process is endothermic, physical adsorption. The ΔG values were negative, indicating that the adsorption of 1-NAP onto raw and modified adsorbent was spontaneous. View Full-Text
Keywords: 1-naphthol; diatomite; kinetic; adsorption; thermodynamics 1-naphthol; diatomite; kinetic; adsorption; thermodynamics

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Yang, X.; Zhang, Y.; Wang, L.; Cao, L.; Li, K.; Hursthouse, A. Preparation of a Thermally Modified Diatomite and a Removal Mechanism for 1-Naphthol from Solution. Water 2017, 9, 651.

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