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- Title
Adsorption of Naphthol green B on CPC modified zeolite from solution and secondary adsorption toward Methylene blue.
- Authors
Zhiqiang Wang; Jinghua Zhang; Haojiang Wang; Runping Han
- Abstract
Removal of dyes from solution is important and low-cost materials as adsorbents are often considered in this field. In this work, the natural zeolite (NZ) was modified by hexadecylpyridinium chloride (CPC) to improve the adsorption capacity toward Naphthol green B (NGB, metal complex dye) and the exhausted adsorbent was further explored to remove Methylene blue (MB) as secondary adsorption. The characteristics of zeolite were carried out by Fourier-transform infrared spectroscopy, X-ray diffraction and Brunauer--Emmett--Teller. The adsorption behaviors of NGB on CPC modified natural zeolite (CZ) were investigated in batch mode. The adsorption quantity toward NGB from experiments was to 20.0 mg g-1 at 313 K (pH = 7.0, dose 1.0 g L-1, dye concentration 160 mg L-1). The adsorption isotherm curves of NGB onto CZ followed Freundlich, Henry, Koble--Corrigan models while kinetic curves were described using pseudo-second-order kinetic model and Elovich equation, suggesting that chemisorption and ion exchange may exist in NGB adsorption. Then, the NGB-loaded CZ (CZ-NGB) was observed to be enough stable within a wide pH range so that the materials were suitable to be applied in secondary adsorption as a new adsorbent for MB adsorption. The Redlich--Peterson and Koble--Corrigan models were confirmed to be better to depict the MB adsorption behaviors. This indicated that MB adsorption was not homogeneous. The kinetic curves of MB adsorption were in agreement with intraparticle diffusion model and double constant. The mechanism of dyes adsorption includes electrostatic attraction, ion exchange, hydrophobic interaction and Van der Waals' force. CZ is promising to remove NGB from solution and NGB-loaded CZ is also effective to bind MB from solution.
- Subjects
METHYLENE blue; BASIC dyes; NAPHTHOL; VAN der Waals forces; ADSORPTION (Chemistry); ZEOLITES; DIFFUSION; ADSORPTION isotherms
- Publication
Desalination & Water Treatment, 2021, Vol 244, p325
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2021.27941