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Removal of phenol from aquatic environment by SDS-modified alumina:Batch and fixed bed studies

机译：SDS改性氧化铝从水环境中去除苯酚的研究：分批和固定床研究

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摘要

Alumina is a very efficient adsorbent for the removal of anionic surfactant(AS)from aqueous environment even when it is present at a very high concentration.After removal of AS the exhausted surfactant coated alumina hereafter designated as surfactant-modified alumina(SMA)posses the ability to remove organic solutes from aquatic environment through the process called adsolubilization.In this study,SMA was used for the removal of phenol from water environment.In batch study it was seen that the pH < 7 favours the removal.The removal efficiency was increased in the presence of anions and decreased a little in the presence of cations.Temperature had no effect on the removal of phenol.The column having a diameter of 2 cm,with different bed heights such as 10,20 and 30 cm could treat 1.65,3.66 and 5.271 of phenol bearing wastewater with initial phenol concentration 50 mg/1 and flow rate 8.5 ml/min.Time required for the bed to become exhausted after the breakthrough occurred was very short.This indicated that the adsorption zone was almost saturated at the time of exhaustion.Different column design parameters like depth of exchange zone,time required for exchange zone to move its own height,adsorption rate,adsorption capacity,etc.,were calculated.Theoretical breakthrough curve was drawn from the batch isotherm data and it was compared with experimental breakthrough curve.Desorption of phenol from the SMA surface was possible using 0.25 M sodium hydroxide solution,rectified spirit and acetone.
机译：氧化铝是一种非常有效的吸附剂，即使在高浓度下也能从水性环境中去除阴离子表面活性剂。去除AS后，用尽的表面活性剂涂覆的氧化铝（以下称为表面活性剂改性的氧化铝）具有以下特点：本研究使用SMA去除水环境中的苯酚，分批研究发现pH <7有利于去除，提高了去除效率温度对苯酚的去除没有影响。直径为2 cm的色谱柱，具有10,20和30 cm的不同床高，可以处理1.65，含苯酚废水的3.66和5.271，其初始苯酚浓度为50 mg / 1，流速为8.5 ml / min，穿透后床耗尽的时间非常短。他的研究表明，耗尽时吸附区几乎已饱和。计算了不同的柱设计参数，例如交换区的深度，交换区移动其自身高度所需的时间，吸附速率，吸附容量等。从批量等温线数据绘制曲线，并将其与实验突破曲线进行比较。使用0.25 M氢氧化钠溶液，精馏酒精和丙酮可以从SMA表面解吸苯酚。

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