Modified Distillers' Grains by Microwave-Assisted Hydrolysis for Cu²⁺ Adsorption from Aqueous Solution

Abstract:

Sodium hydroxide was used to modify distillers' grains (DG) assisted by microwave in order to comprehensive utilization of distillers' grains (DG). The property of distillers' grains (DG) before and after modified was investigated as well as modified conditions. 0.1g of different modified distillers' grains (MDG) was, respectively, used as the absorbents for removal of heavy metal Cu²⁺ ions from aqueous solution at pH 7 and 25°C for 10h. The results show that the modification temperature, time and liquid to solid ratio has little effect on absorption of the modified distillers' grains (MDG) for Cu²⁺ except for concentration of alkali, 5% (wt/v) is the optimum concentration. 5% (wt/v) of the alkali concentration, the hydrolysis temperature of 20°C and the hydrolysis time of 30min and the ratio of liquid to solid ratio of 5:1 were, respectively, used as the optimized conditions to modified distillers' grains (MDG). The removal efficiency of the modified distillers' grains (MDG) for Cu²⁺ (20.00 mg·L¹) is 98.11% under optimized conditions.

• Periodical: Materials Science Forum (Volume 724)
• Pages: 369-373
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.724.369
• Online since: June 2012
• Authors: Rong Rong Su, Yan Chen, Yan Fang Zhou, Xiao Yan Lin, Juan Feng, Jia Quan Rao
• Keywords: Adsorption, Cu²⁺ Ions, Distillers' Grains (DG), Microwave-Assisted Hydrolysis, Modification

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