Issue 41, 2021, Issue in Progress

Preparation of hyper-cross-linked hydroxylated polystyrene for adsorptive removal of methylene blue

Abstract

A series of hydroxylated polystyrene (PS-OH) resins were prepared from macroporous poly(styrene-co-divinylbenzene) by nitration, reductive amination, diazotation and hydrolysis in sequence, and then a series of hyper-cross-linked hydroxylated polystyrene (HCPS-OH) resins were successfully prepared from the PS-OH resins by the Friedel–Crafts post-cross-linking using dichloromethane as an external cross-linker. Benefiting from the synthetic protocol, the HCPS-OH resins showed better adsorption performance for methylene blue in aqueous solution as compared with the corresponding PS-OH resins. HCPS-OH-4, one of the fabricated HCPS-OH resins which had the hydroxyl content of 5.0 mmol g−1 and BET specific surface area of 69.0 m2 g−1, showed the highest adsorption capacity and selectivity for methylene blue. Higher temperature, higher pH, and higher ionic strength were beneficial to adsorption of methylene blue from aqueous solution. HCPS-OH-4 could be regenerated by treatment with 1.0 M HCl methanol solution and deionized water sequentially. Moreover, HCPS-OH-4 retained good adsorption performance for methylene blue even after 5 cycles of adsorption and regeneration, which implied that it was a good candidate for adsorptive removal of methylene blue dye in waste water.

Graphical abstract: Preparation of hyper-cross-linked hydroxylated polystyrene for adsorptive removal of methylene blue

Supplementary files

Article information

Article type
Paper
Submitted
02 Jun 2021
Accepted
19 Jul 2021
First published
23 Jul 2021
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 25551-25560

Preparation of hyper-cross-linked hydroxylated polystyrene for adsorptive removal of methylene blue

F. Li, J. Liu, W. Liu, Y. Xu, Y. Cao, B. Chen and M. Xu, RSC Adv., 2021, 11, 25551 DOI: 10.1039/D1RA04265C

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