超声铁盐改性黄磷水淬渣的制备及除砷性能研究

Research on the preparation of ultrasonic-assisted ferric salts modified phosphorous slag and its As(Ⅲ) removing capacity

以黄磷水淬渣为原料,采用超声辅助铁盐的方法对其进行改性,利用改性后的黄磷水淬渣对废水中As(Ⅲ)进行吸附.考察了超声改性过程中铁盐种类,铁盐浓度及超声时间对改性黄磷水淬渣吸附砷性能的影响,得出最佳制备条件:超声铁盐溶液为FeCl_3,浓度0.8mol/L及超声时间15min.通过傅里叶红外光谱(FT-IR),扫描电镜(SEM)和X射线光电子能谱(XPS)对改性前后的黄磷水淬渣进行表征.最佳制备条件下,Fe^(3+)能很好的负载在黄磷水淬渣表面,对废水中As(Ⅲ)的去除效率达到98.9%,较未改性的黄磷水淬渣提高了38%.改性黄磷水淬渣对As(Ⅲ)的吸附过程符合准二级动力学方程,拟合相关系数(R^2)达到0.96以上;等温吸附规律能够同时满足Langmuir和Freundlich等温吸附模型,拟合相关系数(R^2)均大于0.90.相比较而言,Langmuir等温吸附模型对吸附过程有更好的描述.

The adsorption experiment of As(Ⅲ)in water was studied,and the ultrasonic-assisted ferric salts modifiedphosphorus slag for adsorbent was used.The effects of the variety and concentration of ferric salts,ultrasonic time in theprocess of modification on the adsorbing capacity for As(Ⅲ)by using modified phosphorous slag have been investigated.The optimal preparation conditions are as follows:0.8mol/L of FeCl3,and ultrasonic time of15min.The methods FT-IR,SEM and XPS were used to analyze the difference of the modified and un-modified phosphorous slag.After modification,Fe3+can be a very good load in the surface of phosphorus slag and the removal rate of As(Ⅲ)in wastewater was improvedto98.9%,compared with the unmodified,increased by38%.The kinetics of adsorption process fitted in with pseudosecond order reaction,the fitting correlation coefficient(R2)is above0.96;The adsorption isotherm could also satisfy bothisotherm model of Langmuir and Freundlich simultaneously,the fitting correlation coefficient(R2)is above0.90.Incomparison,the Langmuir isotherm model has a better description of the adsorption process.