酸化凹凸棒石的制备及其对苯胺的吸附性能

Preparation of Acidified Palygorskite and Its Adsorption Performance for Aniline

以天然凹凸棒石为原料,利用不同浓度的盐酸对其进行酸活化改性。对改性后的酸化凹凸棒石进行XRD,SEM,BET,FTIR以及ZATA电位的表征,并以苯胺为模拟污染物,考察不同浓度的盐酸,以及吸附工艺条件对其吸附性能的影响。研究表明,当盐酸的活化浓度为6mol·L^(-1),苯胺溶液的pH为6,苯胺初始质量浓度为50mg·L^(-1),吸附剂投料量为0.5g,温度为30℃,吸附时间为240min时,酸化凹凸棒石具有较高的吸附活性,可吸附脱除75.2%以上的苯胺。此外,苯胺在酸化凹凸棒石上的吸附行为符合假二级动力学模型。

Natural palygorskite was acidified with different concentration of hydrochloric acid.The acidified palygorskite was characterized by XRD,SEM,BET,FTIR and ZATA potential.Under different process conditions,the adsorption performance of acidified palygorskite treated with different concentration of hydrochloric acid,was evaluated by removal of aniline in water.When the activation concentration of hydrochloric acid was 6 mol·L^（-1）,the pH value of the aniline solution was 6,the initial mass concentration of aniline was 50 mg·L^（-1）,the amount of adsorbent was 0.5 g,the temperature was 30℃,the adsorption time was 240 min,the acidified palygorskite could acquire better adsorption activity and remove more than 75.2% of aniline.In addition,the adsorption behavior of aniline over acidified palygorskite was more suitable to be described by pseudo-second-order kinetic model.