CTAB改性铁柱撑膨润土对苯酚的吸附  

Adsorption of Phenol on CTAB Modified Fe Pillared Bentonite

作　　者：舒世立[1,2] 陈伟 贾献峰[1,2] 王磊 SHU Shili;CHEN Wei;JIA Xianfeng;WANG Lei(Department of Chemistry,Tangshan Normal University,Tangshan 063000,China;Tangshan Key Laboratory of Green Specialty Chemicals,Tangshan 063000,China)

机构地区：[1]唐山师范学院化学系,唐山063000 [2]唐山市绿色专用化学品重点实验室,唐山063000

出　　处：《硅酸盐通报》2021年第9期3046-3052,共7页Bulletin of the Chinese Ceramic Society

基　　金：唐山市科学技术与发展计划(18130230a)。

摘　　要：为了研究膨润土对含酚废水的吸附性能,采用羟基铁柱撑剂对钠基膨润土进行预改性,随后用十六烷基三甲基溴化铵(CTAB)改性,制备CTAB改性铁柱撑膨润土。利用X射线衍射仪(XRD)、红外光谱仪(FTIR)和场发射扫描电镜(FESEM)对改性膨润土的结构和性能进行表征。考察了吸附剂用量、吸附时间、吸附温度、苯酚初始浓度和pH值对吸附性能的影响,研究了吸附热力学和吸附动力学规律。结果表明,CTAB进入铁柱撑膨润土的层间和表面。当吸附剂用量为3 g·L^(-1)、吸附时间为60 min、吸附温度为25℃、苯酚初始浓度为300 mg·L^(-1)、苯酚初始pH值为7时,改性膨润土吸附量达到29.7 mg·g^(-1),吸附过程符合准二级动力学模型和Freundlich热力学模型。In order to study the adsorption performance of phenolic wastewater by bentonite,the cetyltrimethylammonium bromide(CTAB)modified Fe pillared bentonite was prepared from sodium bentonite,which was pre-modified by hydroxyl-Fe pillared then modified by cetyltrimethylammonium bromide.The structure of modified bentonite was characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR)and field emission scanning electron microscopy(FESEM).The effects of adsorbent dosage,adsorption time,adsorption temperature,initial phenol concentration and pH value on the adsorption quantity were investigated,and the thermodynamics and kinetics laws of adsorption were discussed.The results show that the CTAB can insert into the interlayer and surface of the Fe pillared bentonite.When the adsorbent dosage is 3 g·L^(-1),adsorption time is 60 min,adsorption temperature is 25℃,initial phenol concentration is 300 mg·L^(-1),and pH value is 7,the phenol adsorption quantity is 29.7 mg·g^(-1).The adsorption process conforms to the pseudo-second-order kinetics model and the isothermal adsorption curve can be described by the Freundlich model.

关 键 词：十六烷基三甲基溴化铵 铁柱撑 膨润土 苯酚 吸附 

分 类 号：X52[环境科学与工程—环境工程]