Phenol is a notorious persistent bioaccumulative toxic substance. Being a primary pollutant, phenol has to be removed completely due to its toxicity even at low concentrations. Now-a-days the use of low cost adsorbents for the effective removal of contaminants from waste water poses a big challenge to the researchers. Modified laterite, a cheap and effective adsorbent was chosen as the adsorbent in the present study. The experiments were carried out to identify optimum values of different parameters that influence the process such as contact time, pH, initial concentration and adsorbent dosage etc. The kinetics of the adsorption process were also studied and found that pseudo second order model was the good fit. Three different isotherm models, viz., Langmuir, Freundlich and Temkin were applied and observed that Freundlich model was obeyed with good agreement. The investigation shows that modified laterite as a low cost adsorbent, can efficiently remove phenol from waste water.

中文翻译：

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使用改性红土吸附剂潜在去除苯酚

苯酚是一种臭名昭著的持久性生物累积有毒物质。作为主要污染物，由于即使在低浓度下也具有毒性，因此必须完全去除苯酚。如今，使用低成本的吸附剂有效去除废水中的污染物给研究人员带来了巨大挑战。改性红土，一种廉价有效的吸附剂被选作本研究的吸附剂。通过实验确定了影响工艺的不同参数的最佳值，例如接触时间，pH，初始浓度和吸附剂用量等。还研究了吸附过程的动力学，发现伪二级模型是很好的拟合。三种不同的等温模型，即，Langmuir，Freundlich和Temkin被应用，并观察到Freundlich模型得到了很好的遵守。研究表明，改性红土作为一种低成本的吸附剂，可以有效地去除废水中的苯酚。