Preparation of GO/PAM Continuous Adsorption Medium and its Dynamic Adsorption Properties for Methylene Blue

Dagang Li,Zhiwen Wang

doi:10.1051/e3sconf/202021301031

Abstract

A continuous and structured porous adsorbent named GO/PAM was synthesised by one-step copolymerization of graphene oxide (GO) and acrylamide (AM) in amorphous region initiated by redox agent consisting of hydrogen peroxide (H2O2) and ascorbic acid (VC) at -20°C. The dynamic adsorption characteristics of methylene blue (MB) in GO/PAM structured adsorption medium were investigated. With the introduction of GO which rich in —OH and —COOH groups, the adsorption capacities were 178.65 mg/g~201.58 mg/g. Structured continuous adsorption medium was prepared by one-step polymerization of crystallization, in order to replace traditional bulk resin and ion exchange resin in the treatment of printing and dyeing wastewater.

Highlights

Textile printing and dyeing industrial wastewater’s largescale and high-efficiency treatment is an important issue to be solved in the field of environmental protection [1-2]
graphene oxide (GO) solution and AM solution were prepared into monomer aqueous solution, and crosslinker MBA and oxidant H2O2 were added into monomer aqueous solution to form polymerization system (the total mass fraction of GO and monomer AM 〔w(AM + GO) = 3% ~ 7%, m (GO): m (AM): 0 ~ 0.25, w(MBA)= 0.9% ~ 1.7%〕
When the initial concentration of methylene blue (MB) increased from 20mg/L to 100mg/L, the breakthrough time was shortened from 220min to 125min. It can be seen from table1 that when the initial concentration of MB increased, the dynamic adsorption capacity of the medium for MB increased

Summary

Introduction

Textile printing and dyeing industrial wastewater’s largescale and high-efficiency treatment is an important issue to be solved in the field of environmental protection [1-2]. Adsorption method has been widely used because of its strong selectivity and simple posttreatment, such as the use of adsorption resin[3], ion exchange resin[4-5], adsorption membrane material[6-7]to be adsorbents and so on. Graphene oxide (GO) rich in —COOH, —OH, —O— and other groups, was selected as functional raw material to form aqueous solution polymerization system with acrylamide (AM) to prepare the GO/PAM structured adsorption medium. The dynamic adsorption characteristics of methylene blue (MB) dye on GO/PAM structured adsorption medium were explored in order to achieve large-scale adsorption treatment of printing and dyeing wastewater containing MB

Experimental

B KTh cin

Results and discussion

Conclusion