摘要
研究了硝酸改性甘蔗渣对模拟废水中的Cr(Ⅵ)的吸附效果,并采用SEM和FTIR等方法对改性前后的甘蔗渣进行表征。结果显示,改性后的甘蔗渣为褶皱层结构,且褶皱层上有许多孔隙,比表面积大大增加,改变了甘蔗渣原本的化学结构,使吸附效果提高。Cr(Ⅵ)初始浓度50 mg/L的废水样,反应温度25℃,改性甘蔗渣投加量18 g/L,p H为2. 0,吸附时间180 min时,Cr(Ⅵ)去除率94. 5%,最大Cr(Ⅵ)吸附量3. 532 mg/g,Langmuir等温吸附模型、拟二级动力学方程能更好的拟合吸附反应。
The effects of nitric acid on the adsorption of Cr( Ⅵ) from simulated waste water were studied.SEM and FTIR were used to characterize the bagasse before and after modification. The results show that the modified bagasse is a folds layer structure,and the folds layer has many pores,the specific surface area increased greatly,changing the original chemical structure of bagasse,so that the adsorption effect is improved. The results showed that when the initial concentration of Cr( Ⅵ) was 50 mg/L,the reaction temperature was 25 ℃,the dosage of modified bagasse was 0. 9 g( 18 g/L),the p H was 2. 0 and the adsorption time was 180 min,the removal rate of Cr( Ⅵ) was 94. 5% and the maximum adsorption capacity of Cr( Ⅵ)was 3. 532 mg/g. The adsorption thermodynamics and kinetics results showed that the adsorption process follows the Langmuir isothermal adsorption model and the pseudo-second-order kinetic equation.
作者
刘雪梅
马闯
吴凡
赵蓓
LIU Xue-mei;MA Chuang;WU Fan;ZHAO Bei(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)
出处
《应用化工》
CAS
CSCD
北大核心
2018年第12期2643-2647,共5页
Applied Chemical Industry
基金
江西省科技支撑计划项目(20161BBF60060)
江西省自然科学基金(20151BAB207009)
