Synthesis of Microporous Cationic Hydrogel of Hydroxypropyl Cellulose (HPC) and its Application on Anionic Dye Removal

Abstract

Hydroxypropyl cellulose has been crosslinked by epichlorohydrin (EPI) and ammonia in sodium hydroxide aqueous solution. A temperature induced phase separation (TIPS) process was applied to synthesize a microporous crosslinked HPC hydrogel and was confirmed by SEM studies. The cationic HPC hydrogel showed an excellent ability to adsorb anionic dye AO7, and the maximum adsorption capacity at room temperature was found to be 2478 (g/kg) at pH 3.96. Both Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms, and the Langmuir model agreed well with the experimental data (R 2 A 0.99). Kinetics of the adsorption were tested and the data agreed well with the pseudo-second-order kinetic model. The strong electrostatic interaction between the quaternary ammonium and dye anions could be the main driving force adsorption. The effects of pH and temperature on the adsorption of the dye have also been investigated and discussed.

Effect of biotite content of hydrogels on enhanced removal of methylene blue from aqueous solution

“…Consequently, the presence of toxic dyes in aqueous streams poses a direct threat to environment and human and has gained worldwide attention. Many techniques such as ion exchange [1], chemical precipitation [2], coagulation [1], ozonation [3], and adsorption [4] have been developed to remove these toxic dyes from aqueous solution. Among these techniques, adsorption is considered as a preferred and effective technique due to that it can deal with various concentrations of dyes and it does not induce the formation of hazardous materials.…”

Removal of Orange II from Aqueous Solutions Using N-Vinyl Imidazole-based Hydrogels as Adsorbents

“…Today, there are several methods, such as adsorption (Hejun et al, 2013;Singh et al, 2013;Yan et al, 2009), coagulation (Moghaddam et al, 2010), electrochemical methods (Ding et al, 1987), chlorination/ozonation (Namboodri et al, 1994), chemical oxidation (Dutta et al, 2001) and biological treatment (Kornaros and Lyberatos, 2006), applied for the removal of synthetic dyes from industrial wastewater. However, most of these methods have disadvantages such as difficulty for application and high costs.…”

Fabrication of hydrogel of hydroxypropyl cellulose (HPC) composited with graphene oxide and its application for methylene blue removal

“…HPC-based materials are useful in removing dyes from aqueous solutions. However, one of the main limitations in the practical use of HPC hydrogels is their relatively small adsorption capacity [25]. Incorporation of nanofillers with large specific surface and multiple functional groups is often used to improve the adsorption capacity and mechanical properties of the biopolymer-based hydrogels [26,27].…”