Synthesis of a Novel and Salt Sensitive Superabsorbent Hydrogel Using Soybean Dregs by UV-Irradiation

Yisa Fan; Mingyue Zhang; Linjian Shangguan

doi:10.3390/ma11112198

Synthesis of a Novel and Salt Sensitive Superabsorbent Hydrogel Using Soybean Dregs by UV-Irradiation

Materials (Basel). 2018 Nov 6;11(11):2198. doi: 10.3390/ma11112198.

Authors

Yisa Fan¹, Mingyue Zhang², Linjian Shangguan³

Affiliations

¹ School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450000, China. fanys15@mails.jlu.edu.cn.
² College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China. mingyuezhang@henau.edu.cn.
³ School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450000, China. shangguanlinjian@ncwu.edu.cn.

Abstract

A biomass based hydrogel soybean dregs-Poly(acrylic acid) (SD-PAA) was synthesized under UV radiation while using agricultural waste soybean dregs. Maximum absorption of SD-PAA is 3587 g·g^-1 in distilled water and 302.0 g·g^-1 in 150 mM NaCl aqueous solution. Moreover, the influence of granularity, salt solution, and ions in the solutions on water absorption is systematically studied. Sensitivity sequence of the hydrogel to cations was K⁺ < Na⁺ < NH₄⁺ < Al³⁺ < Fe³⁺ < Mg²⁺ < Ca²⁺, and that to anions was PO₄^3- > SO₄^2- > Cl^-. Moreover, the experimental results showed that SD-PAA water retention capability remained 37% after centrifugating for 60 min and 0.2% being dried at 60 °C for 70 h. Meanwhile, the swelling data agree well with the pseudo-second-order kinetic model and Fickian diffusion mechanism.

Keywords: UV-irradiation; absorption; dwelling; kinetics; salt sensitive; soybean dregs.

Grants and funding

51075187/National Natural Science Foundation of China