Development of effective nano-biosorbent based on poly m-phenylenediamine grafted dextrin for removal of Pb (II) and methylene blue from water

Carbohydrate Polymers
Ehsan Nazarzadeh ZareNeda Kasirian

Abstract

Novel nano-biosorbent was successfully prepared based on dextrin-g-poly m-phenylenediamine (DgPmPDA) and graphene oxide (GO) by using the solution blending technique and was found to be an effective adsorbent for Pb(II) and methylene blue (MB) dye. The nano-biosorbent was characterized by FTIR, CHN, XRD, SEM, AFM and TGA. The adsorption process depended on the pH of solution, adsorbent dosage, contact time, initial concentration of Pb(II) and MB, and temperature. Experimental results were in good agreement with Langmuir isotherm model for both Pb(II) and MB adsorption. The maximum adsorption capacity (Qmax) of Pb(II) and MB was found to be 80 mg/g and 76.33 mg/g, respectively, at optimum conditions. Results showed that the kinetics of Pb(II) and MB onto the DgPmPDA@GO nano-biosorbent followed the pseudo-first-order and pseudo-second-order models, respectively. Thermodynamic parameters exhibited the endothermic and spontaneous nature of the sorption process. A possible mechanism of adsorption was suggested where π-π stacking interactions, H-bonding interaction and electrostatic attraction controlled the MB adsorption and chelation and electrostatic attraction controlled the Pb(II) adsorption.

Citations

Jul 10, 2019·Environmental Technology·Zhiyuan WanHuifang Wu
Nov 9, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Mina KhosraviMajid Baghdadi
Oct 28, 2019·Environmental Science and Pollution Research International·Wei QuRen-Jie Song
Dec 19, 2020·Comprehensive Reviews in Food Science and Food Safety·Germán Ayala ValenciaTomy J Gutiérrez
Sep 16, 2020·International Journal of Biological Macromolecules·Xin HuangXinlin Wei
Nov 16, 2019·ACS Applied Materials & Interfaces·Qadeer Ul HassanJian-Ping Zhou

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