Facile preparation of zirconium(IV) immobilized carboxymethyl cellulose/multiwalled carbon nanotubes gels by radiation technique and its selective fluoride removal

• Published in: International journal of biological macromolecules 2024-12, Vol.282 (Pt 6), p.137447, Article 137447
• Main Authors: Zeng, Zhengkui, Xu, Ke, Zhang, Feixue, Yang, Xin, Du, Jifu, Dong, Zhen, Bao, Qiburi, Zhao, Long
• Format: Article
• Language: English
• Subjects: Adsorption; Carboxymethyl cellulose; Carboxymethylcellulose Sodium - chemistry; Fluorides - chemistry; Gels - chemistry; Hydrogen-Ion Concentration; Kinetics; Multiwalled carbon nanotube; Nanotubes, Carbon - chemistry; Radiation technique; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - isolation & purification; Water Purification - methods; Zirconium - chemistry
• ISSN: 0141-8130; 1879-0003; 1879-0003
• DOI: 10.1016/j.ijbiomac.2024.137447

Removal of excessive fluorine in the waterbody environment and the Zn hydrometallurgical system is an urgent problem. In this paper, zirconium oxychloride immobilized carboxymethyl cellulose/carboxymethyl multiwalled carbon nanotube (CMC+MWCCNT-ZrOCl2) gels are facilely prepared by radiation technique. The addition of MWCCNT endows the CMC-ZrOCl2 gel a typical nanotubes/fiber structure, also increase the gel fraction of the gel. The selective adsorption of fluoride from single or co-existed anions was investigated. The adsorption isotherms can be well fitted by both the Langmuir and Freundlich model. The calculated maximum adsorption capacity was 36.657 mg/g. The selectivity coefficients of CMC+MWCCNT-ZrOCl2 for fluoride versus NO3−, PO43−, and SO42− are 140.34, 10.953, and 72.572, respectively. Also, CMC+MWCCNT-ZrOCl2 can be used as a potential adsorbent for selective removing F− from high concentration SO42− solution. The adsorption mechanism was investigated by XPS analyses.