Degradation of wood vinegar conversion solution by calcium oxide combined with ozone for decolorization
SONG Zhao-xia1, LI Yu-hui1, LI Ling-yu1, LI Ming1, TANG Jue-min1, XU Ying-mei1,2
1. School of Life Science, Dalian Minzu University, Dalian 116600, China; 2. Key Laboratory of Biotechnology and Bio-resources Utilization, the Ministry of Education, Dalian 116600, China
Abstract: Calcium oxide as a base catalyst is used for catalytic ozonation degradation and decolorization of wood vinegar conversion solution (calcium acetate-based solution).Effects of reaction time and calcium oxide dosage on the degradation of wood vinegar conversion solution are investigated.In addition,both the change of pH value of wood vinegar conversion solution and the nature of residual solid products are studied.Results show that the increase of calcium oxide content results in improvement of degradation reaction.The optimum dosage of calcium oxide is determined to be 4 g·L-1.Ozonation degradation is proven to be a process of continuous acidification.Calcium oxide as a typical alkaline can promote the generation of hydroxyl radicals in the process of catalytic reaction.As a result,the degradation of macromolecular organic compound is enhanced to form small molecular organic acids.It is indicated that the residual solid in wood vinegar conversion solution after degradation is compose of calcium oxalate dihydrate.
宋朝霞, 李宇慧, 李灵毓, 李明, 唐觉敏, 许英梅. 氧化钙协同臭氧降解脱色木醋液转化液的研究[J]. 现代化工, 2020, 40(6): 118-122.
SONG Zhao-xia, LI Yu-hui, LI Ling-yu, LI Ming, TANG Jue-min, XU Ying-mei. Degradation of wood vinegar conversion solution by calcium oxide combined with ozone for decolorization. Modern Chemical Industry, 2020, 40(6): 118-122.
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