响应面优化酸化赤泥的制备及其吸附环丙沙星的研究  

Preparation of acidified red mud using response surface methodology for adsorptive removal of ciprofloxacin from water

作　　者：史京转[1,2] 周孝德 魏红[1] 郑佳欣[1] 黄九峰 SHI Jingzhuan;ZHOU Xiaode;WEI Hong;ZHENG Jiaxin;HUANG Jiufeng(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi’an University of Technology,Xi’an 710048,China;Weinan Environmental Science Institute,Weinan 714000,China;Yixiang Aluminium Industry Co.,Ltd.of Sanmenxia,Sanmenxia 472435,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西西安710048 [2]渭南市环境科学研究所,陕西渭南714000 [3]三门峡义翔铝业有限公司,河南三门峡472435

出　　处：《西安理工大学学报》2019年第4期411-419,共9页Journal of Xi'an University of Technology

基　　金：教育部高等学校博士学科点专项科研基金资助项目(20136118120022);陕西省自然科学基金资助项目(2017JM5082);陕西省水利科技资助项目(2013slkj-07);陕西省教育厅科学研究计划专项资助项目(16JK1567)

摘　　要：为了提高赤泥的资源化利用和降低抗生素对环境的危害,以拜耳法赤泥为原料,以硫酸酸化时间、搅拌速率、赤泥添加浓度为自变量,以环丙沙星的吸附量为响应值建立响应面优化模型。利用Box-Behnken实验设计方法,确定酸化赤泥制备的最佳条件。采用扫描电镜、比表面积、X射线衍射以及能量色散X射线光谱分析对酸化赤泥进行表征。另外,研究了酸化赤泥吸附环丙沙星的影响因素和热力学函数。研究结果表明,赤泥添加浓度5 g/L、0.5 mol/L硫酸调节体系pH取6.0、100 r/min转速下搅拌9.18 h,得到的酸化赤泥在140 min内对30 mg/L浓度的环丙沙星吸附量达到最大4.84 mg/g。与赤泥相比,酸化赤泥的比表面积由10.96 m^2/g增加到17.44 m^2/g,内部平均孔径由40.93 nm增大为45.41 nm,有效活性物质由2.05%增加到19.04%,有效增强了酸化赤泥的吸附性能。酸化赤泥的吸附性能还与反应体系温度、pH值以及酸化赤泥的添加浓度等因素有关。In order to improve the resource utilization of solid waste red mud and reduce the harm of antibiotics to the environment,the adsorption capability of the acidified red mud(AaRM)to ciprofloxacin was studied.The response surface optimization model was established with the Bayer process red mud as raw material,sulfuric acid acidification time,agitation rate and red mud additive concentration as independent variables,and the adsorption capacity of ciprofloxacin as the response value.The optimum conditions for the preparation of AaRM to adsorb ciprofloxacin were determined by using the Box-Behnken design.The prepared AaRM was characterized by SEM,BET,XRD and EDX techniques.The factors influencing the adsorption of ciprofloxacin by AaRM were studied as well.The results showed that when 5g/L of red mud was treated with 0.5 mol/L of sulfuric acid at pH 6.0,the stirring speed is of 100 r/min for 9.18h,and that the obtained AaRM had the adsorption capacity of 4.84mg/g for 30mg/L of ciprofloxacin.In addition,AaRM,compared with the original red mud,increased the specific surface area from 10.96 m^2/g to 17.44 m^2/g,the internal average pore diameter is from 40.93nm to 45.41nm,and the effective active component content is fro m^2.05%to 19.04%,with the adsorption performance effectively enhanced.Furthermore,the adsorption capacity of AaRM toward ciprofloxacin was found to be related to the reaction system temperature,pH value and the addition concentration of AaRM.

关 键 词：拜耳法赤泥 响应面法 酸化赤泥 环丙沙星 

分 类 号：X172[环境科学与工程—环境科学]