使用硅烷和咪唑改性蒙脱石从水溶液中去除五氯苯酚：动力学和等温线研究
Pentachlorophenol removal from aqueous solutions using Montmorillonite modified by Silane & Imidazole: kinetic and isotherm study.
作者信息
Seyedi Zahra, Amooey Ali Akbar, Amouei Abdoliman, Tashakkorian Hamed
机构信息
1Department of Chemical Engineering, University of Mazandaran, Babolsar, Iran.
2Environmental Health Research Center (EHRC), Department of Environmental Health, Babol University of Medical Sciences, Babol, Iran.
出版信息
J Environ Health Sci Eng. 2019 Dec 5;17(2):989-999. doi: 10.1007/s40201-019-00414-6. eCollection 2019 Dec.
BACKGROUND
Removal of pentachlorophenol (PCP) from wastewater containing chlorophenols, due to its toxicity, mutagenic and carcinogenic properties, has been attracted much interests of researchers.
METHODS
In this research, K10 montmorillonite was modified by silane and imidazole (Im) for increasing the removal percentage of PCP from aqueous solutions. It was characterized by FTIR, XRF, FESEM, EDS, and BET techniques. The influence of different parameters such as initial concentration, contact time, adsorbent dosage, pH, temperature and agitating speed was investigated.
RESULTS
The maximum removal percentage (95%) were obtained for PCP at pH = 4. The isotherm experimental data for pentachlorophenol was best fitted using the Langmuir model and the kinetic studies were better described by the pseudo-second-order kinetic model. The thermodynamic study indicated that the adsorption of PCP by the adsorbent was feasible, spontaneous and exothermic.
CONCLUSION
In this study, the modified montmorillonite by silane and imidazole is appropriate and low cost adsorbent for increasing of the removal percentage of PCP from aqueous solutions.
背景
由于五氯苯酚（PCP）具有毒性、致突变性和致癌性，从含氯酚的废水中去除PCP引起了研究人员的广泛关注。
方法
在本研究中，用硅烷和咪唑（Im）对K10蒙脱石进行改性，以提高其从水溶液中去除PCP的百分比。通过傅里叶变换红外光谱（FTIR）、X射线荧光光谱（XRF）、场发射扫描电子显微镜（FESEM）、能谱仪（EDS）和比表面积分析仪（BET）技术对其进行了表征。研究了初始浓度、接触时间、吸附剂用量、pH值、温度和搅拌速度等不同参数的影响。
结果
在pH = 4时，PCP的最大去除率为95%。五氯苯酚的等温线实验数据最符合Langmuir模型，动力学研究用准二级动力学模型能更好地描述。热力学研究表明，吸附剂对PCP的吸附是可行的、自发的且放热的。
结论
本研究中，经硅烷和咪唑改性的蒙脱石是一种合适且低成本的吸附剂，可提高从水溶液中去除PCP的百分比。
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