Phenolic compounds are prevalent organic contaminants in aquatic and soil environments. To address the issue of phenolic waste water treatment, bentonite can be utilised as an effective adsorbent through organic modification. The present study focuses on using sodium bentonite, which was modified with cetyltrimethylammonium bromide (CTMAB), to remove phenol from an aqueous solution. The influence of various factors such as adsorption time, initial phenol concentration and CTMAB–bentonite dosage on phenol adsorption was thoroughly investigated. In addition, the microstructural changes during the adsorption process, adsorption kinetics and adsorption isotherms of the organically modified bentonite (OMB) were analysed. The results indicated that the adsorption equilibrium time of OMB was longer compared with that of sodium bentonite. The amount of phenol adsorbed by OMB was found to be positively correlated with the initial phenol concentration and CTMAB–bentonite dosage. The maximum phenol adsorption capacity and removal rate achieved were 3.00 mg/g and 43.74%, respectively. The study also revealed that a quasi-second-order kinetic model was appropriate for describing the phenol adsorption process of OMB, and the adsorption isotherm was found to conform with the Freundlich isotherm model. These findings demonstrate the potential of OMB as an efficient and effective adsorbent for phenolic waste water treatment.

中文翻译：

---

有机改性膨润土对苯酚的吸附性能及微观结构变化

酚类化合物是水生和土壤环境中普遍存在的有机污染物。为了解决含酚废水的处理问题，膨润土可以通过有机改性作为有效的吸附剂。本研究的重点是使用用十六烷基三甲基溴化铵 (CTMAB) 改性的钠膨润土从水溶液中去除苯酚。深入研究了吸附时间、苯酚初始浓度和 CTMAB-膨润土用量等各种因素对苯酚吸附的影响。此外，分析了有机改性膨润土（OMB）在吸附过程中的微观结构变化、吸附动力学和吸附等温线。结果表明，与钠基膨润土相比，OMB 的吸附平衡时间更长。发现 OMB 吸附的苯酚量与初始苯酚浓度和 CTMAB-膨润土用量呈正相关。苯酚的最大吸附容量和去除率分别为 3.00 mg/g 和 43.74%。研究还表明，准二级动力学模型适用于描述OMB对苯酚的吸附过程，吸附等温线符合Freundlich等温线模型。这些发现证明了 OMB 作为一种高效且有效的酚类废水处理吸附剂的潜力。研究还表明，准二级动力学模型适用于描述OMB对苯酚的吸附过程，吸附等温线符合Freundlich等温线模型。这些发现证明了 OMB 作为一种高效且有效的酚类废水处理吸附剂的潜力。研究还表明，准二级动力学模型适用于描述OMB对苯酚的吸附过程，吸附等温线符合Freundlich等温线模型。这些发现证明了 OMB 作为一种高效且有效的酚类废水处理吸附剂的潜力。