第31卷第5期 高 校 化 学 工 程 学 报 No.5 Vol.31 2017 年10月 Journal of Chemical Engineering of Chinese Universities Oct. 2017
文章编号:1003-9015(2017)05-1072-08
疏水纳米二氧化硅作为捕获剂泡沫浮选结晶紫的工艺研究
靳丽雪, 胡 楠, 李雅杰, 吴兆亮 (河北工业大学 化工学院, 天津 300130)
摘 要:为了有效去除水溶液中的结晶紫,以疏水纳米二氧化硅作为捕获剂,在不需要添加任何表面活性剂的前提下开发了一种新型泡沫浮选技术。结果表明,当无水乙醇用量0.8%(V)、pH值为9.0、疏水纳米二氧化硅浓度200 mgL1、气速700 mLmin1、装液量400 mL时,废水中结晶紫的去除率和富集比分别为94.7%和19.7;疏水纳米二氧化硅的去除率和富集比分别为93.9%和14.2。消泡液中的疏水纳米二氧化硅在pH值为1.0的无水乙醇溶液经两次解吸操作,结晶紫解吸率可达到90.2%。通过旋蒸操作,可将解吸液中结晶紫染料回收,同时纳米颗粒达到重复利用的目的。因此,该技术对处理染料废水具有重要的指导意义。 关键词:泡沫浮选;疏水纳米二氧化硅;结晶紫;捕获剂 中图分类号:TQ028.8;X703.1 文献标识码:A DOI:10.3969/j.issn.1003-9015.2017.05.008 Removal of Crystal Violet by Froth Flotation Using Hydrophobic Silica
Nanoparticle as a Collector
JIN Li-xue, HU Nan, LI Ya-jie, WU Zhao-liang (School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China) Abstract:In order to effectively remove crystal violet (CV) from aqueous solution, hydrophobic silica nanoparticle (SNP) was used as a collector and froth flotation was developed without surfactants. The results show that the removal percentage (R) and the enrichment ratio (E) of CV are 94.7% and 19.7, respectively, when studied under conditions of anhydrous ethanol dosage 0.8%(V), pH 9.0, SNPs concentration 200 mgL1, superficial gas velocity 700 mLmin1 and loading liquid volume 400 mL. Meanwhile, RSNPs and ESNPs are 93.9% and 14.2, respectively. CV can be effectively separated using ethanol elution at pH 1.0 for twice, and the desorption percentage is 90.2%. CV dissolved in ethanol can be isolated by a rotatory evaporator. Moreover, hydrophobic SNPs could be recycled. This study provides a promising way for the treatment of dye-contaminated wastewaters. Key words: froth flotation; hydrophobic silica nanoparticles; crystal violet; collector