摘要
将粉煤灰、硅藻土复合焙烧改性后制得吸附剂——粉煤灰-硅藻土复合材料,并将其应用于吸附选矿废水中的Cr(Ⅵ),考察了溶液Cr(Ⅵ)初始浓度、pH值、吸附剂投加量、吸附温度、吸附时间等参数对吸附剂吸附Cr(Ⅵ)效果的影响。结果表明:粉煤灰与硅藻土复合焙烧改性后,材料孔隙增加,比表面积增大;粉煤灰-硅藻土复合材料对Cr(Ⅵ)的吸附是一个自发的吸热过程,以物理吸附为主。在溶液Cr(Ⅵ)初始浓度10 mg/L、pH=2、粉煤灰-硅藻土复合材料投加量20 g/L、吸附温度60℃、吸附时间6 h条件下,500℃焙烧2 h制得的粉煤灰-硅藻土复合材料对废水中Cr(Ⅵ)去除率可达70.6%。
After two materials of fly ash and diatomite were subjected to roasting process for modification, a kind of adsorbent, fly ash-diatomite composite, was prepared and then was used to adsorb Cr(Ⅵ) in mineral processing wastewater. The effects of factors, such as initial concentration of Cr(Ⅵ), pH value, absorbent dosage, temperature and time of adsorption, on the adsorption of Cr(Ⅵ) were investigated. Results show that after roasting and modification, the composite has more porosity and larger specific surface area. The adsorption of Cr(Ⅵ) by the prepared composite is a spontaneous endothermic reaction, predominated by physical adsorption. In the experiment, the composite was prepared by roasting at 500 ℃, and then 20 g/L of such composite was used to adsorb Cr(Ⅵ) from the solution with an initial concentration of Cr(Ⅵ) of 10 mg/L and pH of 2 at a temperature of 60 ℃. After 6 h adsorption, the removal rate of Cr(Ⅵ) from the wastewater reached 70.6%.
作者
吴吉昀
冯博
陈燕
刘建英
杨增烨
WU Ji-yun;FENG Bo;CHEN Yan;LIU Jian-ying;YANG Zeng-ye(Collaborative Innovation Center for Development and Utilization of Rare Metal Resources Co-sponsored by Ministry of Education and Jiangxi Province,Ganzhou 341000,Jiangxi,China;Jiangxi Provincial Key Laboratory of Mining Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
出处
《矿冶工程》
CAS
CSCD
北大核心
2022年第4期125-129,共5页
Mining and Metallurgical Engineering
基金
国家自然科学基金(52174248)
江西省自然科学基金(20202ACBL214010)
青年井冈学者奖励计划
江西省“双千计划”(jxsq2019201115)。
关键词
粉煤灰
硅藻土
含铬废水
焙烧改性
吸附
物理吸附
Cr(Ⅵ)
fly ash
diatomite
chromium-containing wastewater
roasting for modification
adsorption
physical adsorption
Cr(Ⅵ)
