摘要
含有合成染料的废水具有成分复杂、可生物降解性能差、COD高等特点受到了广泛研究。使用氨基化石墨烯/聚乙烯亚胺复合材料(GO-NH2/PEI)对典型的阴离子染料甲基橙和刚果红进行吸附,最佳吸附条件为:染料含量150 mg/L、吸附剂用量0.5 g/L、溶液p H值为6、吸附温度318 K和吸附时间240 min时,GO-NH2/PEI对甲基橙和刚果红的吸附量可达282.82 mg/g和240.22 mg/g,循环使用5次,仍可保持约90%的最大吸附量。并使用吸附等温线、吸附热力学、吸附动力学等对吸附过程进行拟合,结果表明:GO-NH2/PEI对阴离子染料的吸附主要为单层化学吸附,是吸热熵增的自发过程。GO-NH2/PEI作为多孔材料,合成染料分子越小,越容易扩散进复合材料内部与活性官能团缔合,吸附性能越好。
Wastewater containing synthetic dyes with complex composition,poor biodegradability and high COD has been widely studied.The adsorption of typical anionic dyes,methyl orange and Congo red,using aminated graphene/polyethyleneimine composites(GO-NH2/PEI)was carried out under the following optimal adsorption conditions:dye content was 150 mg/L,adsorbent dosage was 0.5 g/L,solution pH was 6,adsorption temperature was 318 K and adsorption time was 240 min,and the adsorption capacity of methyl orange and Congo red by GO-NH2/PEI could reach 282.82 mg/g and 240.22 mg/g,and the maximum adsorption amount of about 90%could still be maintained after 5 times of recycling.The results showed that the adsorption of anionic dyes by GO-NH2/PEI was mainly monolayer chemisorption,which is a spontaneous process of heat absorption and entropy increase.As GO-NH2/PEI was a porous material,the smaller the molecule of synthetic dye,the easier it was to diffuse into the interior of the composite and join with the active functional group,and the better adsorption performance.
作者
梁永贤
姚庆达
许春树
王小卓
周松喜
官志坚
LIANG Yongxian;YAO Qingda;XU Chunshu;WANG Xiaozhuo;ZHOU Songxi;GUAN Zhijian(Weizheng Intellectual Property Technology Co.,Ltd.,Shenzhen 518000,China;Xingye Leather Technology Co.,Ltd.,Jinjiang 362200,China;Jinjiang Testing Institute of Quality and Metrology,Jinjiang 362200,China)
出处
《皮革与化工》
CAS
2023年第3期9-18,共10页
Leather And Chemicals