Sustainable Cross-linked Porous Corn Starch Adsorbents with High Methyl Violet Adsorption

Huige Wei 1, Email

Junhui Ma 1

Yapeng Shi 1

Dapeng Cui 2

Mingzhu Liu 3

Na Lu 4

Ning Wang 5

Tingting Wu 6

Evan K. Wujcik 7

Zhanhu Guo 8, Email

College of Chemical Engineering and Materials Science Tianjin University of Science and Technology, Tianjin, 300457 China
College of Packing and Printing Engineering Tianjin University of Science and Technology, Tianjin, 300222 China
Department of Chemistry and State Key Laboratory of Applied Organic Chemistry Lanzhou University, Lanzhou, 730000 China
Lyles School of Civil Engineering, School of Materials Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, 47906, USA
State Key Laboratory of Marine Resource Utilization in South China Sea, College of Materials and Chemical Engineering, Hainan University, Haikou 570228, PR China
Department of Civil and Environmental Engineering, The University of Alabama in Huntsville, Huntsville, Alabama 35899, USA
Materials Engineering and Nanosensor [MEAN] Laboratory, Department of Chemical and Biological Engineering, University of Alabama, Tuscaloosa, AL, USA
Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996 USA


The present paper reports the preparation of cross-linked porous corn starch (c-PCS) with high methyl violet adsorption capabilities. To obtain c-PCS, the pre-alkalization of porous corn starch (PCS) was first performed using sodium hydroxide/sodium chloride (NaCl/NaOH), followed by the cross-linking of PCS employing epichlorohydrin (ECH) as the cross-linking reagent. The effects of key experimental parameters, i.e. the mass ratio of NaOH to PCS (mNaOH/mpcs), the mass ratio of NaCl to PCS (mNaCl/mpcs), the temperature (Ta) and reaction time (ta) during the alkalization process, the ratio of ECH volume to the mass of PCS (VECH/mpcs), the ratio of solution volume to the mass of PCS (Vs/mpcs), pH value, the temperature (Tc), and the reaction time (tc) in the cross-linking reaction, on the adsorption capability of c-PCS using methyl violet as an adsorbed model were investigated in details. A maximum adsorption capability of 48.3 % was achieved with the following optimum experimental parameters: mNaOH/mpcs= 0.02, mNaCl/mpcs= 0.06, Ta= 40 oC, ta= 1.0 h, VECH/mpcs= 0.003 (mL/g), V/m = 7 (mL/g), pH=10, Tc= 20oC, tc= 3.0 h. The improved adsorption performance was caused by the changed morphology as confirmed by the scanning electron microscope image.

Sustainable Cross-linked Porous Corn Starch Adsorbents with High Methyl Violet Adsorption