文献类型：会议论文

英文题名：Study on Green Decolorization Technology of Agar in the Extraction Process

作者：Cai, Ying[1]; Wu, Zhanxia[1]; Li, Sidong[1]; Wang, Minting[1]; Guo, Wanting[1]; Hu, Zhang[1]

机构：[1] Department of Applied Chemistry, School of Chemistry and Environmental Science, Guangdong Ocean University, China

会议论文集：8th Annual International Conference on Material Science and Engineering, ICMSE 2020

会议日期：August 14, 2020 - August 15, 2020

会议地点：Guiyang, Guizhou, China

语种：英文

外文关键词：Indicators (chemical) - Polysaccharides - Algae - Extraction - Environmental technology

外文摘要：To establish a green decolorization technology of agar in the extraction process, the effects of activated carbon amount, decolorization time and decolorization temperature on the decolorization of agar solution extracted from Gracilaria rubra were investigated through single-factor tests with the decolorization ratio as an index. On the basis of single-factor tests, the decolorization process was optimized using orthogonal experiments. The results showed that the optimum conditions for decolorization with activated carbon were as follows: amount of activated carbon 0.6 g/100mL, decolorization time 5 min and decolorization temperature 70 C. When the optimum conditions of decolorization with activated carbon were used on the basis of pre-treatment of diatomite, the decolorization rate of agar solution reached 81.6%, and the agar solution was nearly colourless, clear and transparent. The diatomite-pretreated decolorization of activated carbon overcame the disadvantages that chemicals are needed to acidify and bleach Gracilaria in the traditional agar extraction process. It not only avoided the use of chemicals, but also effectively decreased the water consumption and the amount of produced chemical-containing waste water. ? Published under licence by IOP Publishing Ltd.