摘要
液相化学还原法制备纳米银是近些年的研究热点之一,但工艺过程产生的工业废水处理问题未有关注。首次采用钡盐沉淀法处理纳米银工业废水,考察了反应温度、p H值、钡盐种类等因素对废水COD (化学需氧量)及色度去除率的影响。其最佳工艺条件如下:反应温度15℃,初始p H值10. 5,反应时间1h,每100mL废水投加二水氯化钡8g;废水COD去除率为85. 6%,色度去除率高达97. 1%。傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)等表明:纳米银工业废水中存在醌-氢醌类化合物,此羟基醌类化合物可与溶液中的钡离子反应生成沉淀而得以去除;另外,新生成的硫酸钡细微颗粒带正电,絮凝沉降过程对废水中的羟基醌类化合物存在吸附作用。
In recent years, liquid - phase chemical reduction is one of the research focus for nano - silver preparation, but the treatment of industrial wastewater produced from the process has not been concerned. In this study, precipitation with barium salt was firstly used to treatment nano -silver industrial wastewater, and the imquencing factors such as reaction temperature, pH value, and barium dosage on the removal of COD （chemical oxygen demand ） and color were investigated. The optimum parameters were as follows, reaction temperature 15℃ , initial pH value 10. 5, reaction time 1h, and the dosage 8g BaC12 · 2H2O per 100 mL wastewater. Under these conditions, the removal rate of COD and color were 85.6% and 97. 1% , respectively. Fourier transform infrared （ FT-IR ） spectroscopy, X-ray diffraction （ XRD ） and other analysis showed that nano-silver wastewater contains quinone/hydroquinone compounds, and this kind of hydroquinone compounds can react with barium ions in the solution to form precipitates and then be removed from wastewater. In addition, the newly formed particles including barium sulfate and barium carbonate are positively charged, and their flocculating settling can improve the removal of hydroxyquinone compounds due to adsorption action.
作者
王群超
姚晓菲
WANG Qun-chao;YAO Xiao-fei(Faculty of Environmental Science ＆ Engineering,Kunming University of Science ＆ Technology,Kunming 650500,China;Panzhihua University,Panzhihua,Sichuan 617000,China)
出处
《四川环境》
2018年第5期1-6,共6页
Sichuan Environment
基金
云南省科技计划项目面上项目(2016FB093)
关键词
纳米银
沉淀法
钡盐
工业废水
Nano-silver
precipitation
barium salt
industrial wastewater
作者简介
王群超（1994-），男，河南鹿邑人，昆明理工大学环境科学与工程学院在读硕士研究生，研究方向为水污染控制技术。;通讯作者：姚晓菲，bridgelsg@sina．com。
