期刊
JOURNAL OF THE IRANIAN CHEMICAL SOCIETY
卷 18, 期 12, 页码 3377-3386出版社
SPRINGER
DOI: 10.1007/s13738-021-02273-1
关键词
Molecular sieves; Heavy metal; Adsorption process
资金
- CNPq (National Council of Technological and Scientific Development -Brasilia, DF, Brazil)
- CAPES (Coordination for the Improvement of Higher Education Personnel)
- IRCC (Industrial Research and Consultancy Centre), Indian Institute of Technology Bombay, MoE (Ministry of Education), India
- PNPD/CAPES
- DT2/CNPq
This study proposed the use of an adsorption system composed of clay minerals and zeolite to separate Cu2+ and Cr6+ ions in wastewater from the textile industry. The results showed that the zeolitic material had the maximum adsorption of Cu2+ ions at pH 3.5 and Cr6+ ions at pH 7.5, while clay minerals were less efficient in comparison. The adsorption system achieved the desired efficiency with substantial removal of Cu2+ and Cr6+ ions from synthetic wastewater solutions.
The textile industries release a substantial amount of effluents into water resources every year. The vast majority of these effluents are composed of heavy metals that bind the textile fibres with dyes. This work proposes to use an adsorption system composed of clay-minerals (kaolinite and montmorillonite) and molecular sieve (zeolite) for separating the Cu2+ and Cr6+ ions, considering the pH changes of aqueous solutions. The adsorbent materials were characterized using the following state of the art techniques such as X-ray fluorescence, X-ray diffraction, Raman spectroscopy and Cation exchange capacity. During the adsorption tests, the contact time of the adsorbates (Cu2+ and Cr6+ ions in concentrations of 100, 50, 10 and 5 mg/L) with the adsorbents vary from 1 to 4 h in acidic and alkaline conditions (pH 3.5 and 7.5). The results indicate maximum adsorption of Cu2+ (at pH 3.5) and Cr6+ (at pH 7.5) ions on application of the zeolitic material. The clay minerals conclusively proved to be less efficient when compared to zeolite. It can be concluded that the adsorption system has achieved the desired efficiency, with substantial removal of Cu2+ and Cr6+ ions for zeolites in synthetic wastewater solutions of the textile industry.
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