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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Adsorption of 4-chlorophenol by inexpensive sewage sludge-based adsorbents
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Adsorption of 4-chlorophenol by inexpensive sewage sludge-based adsorbents

机译：吸附的4-chlorophenol便宜的污水污泥作吸附剂

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摘要

Sewage sludge was used as precursor to develop a potential inexpensive adsorbent by both simple drying and pyrol-ysis. The resulting materials were evaluated as adsorbents for the removal of 4-chlorophenol (4-CP) from aqueous solution. The dried biosolids showed a BET surface area lower than 3 m~2/g, which yield a maximum adsorption capacity of 0.73mmol 4-CP/g at pH 5.0 and 15 C. The carbonization of biosolids under relatively mild conditions allowed obtaining materials with BET surface area up to 45 m~2/g, which led to a significant increase of the maximum adsorption capacity (1.36 mmol 4-CP/g). The high ash content of the starting material (23%, d.b.) limits the development of porosity on a total dry-weight basis. Adsorption data were well fitted to the Redlich-Peterson isotherm equation whereas the most commonly used Langmuir and Freundlich equations were less satisfactory probably because of the occurrence of summative adsorption phenomenon. A thermodynamic study of the adsorption showed the spontaneous and exothermic nature of the process. Thus, simple drying and carbonization provide two ways of valorization of sewage sludge through its conversion into inexpensive low-rank adsorbents potentially useful for the removal of some hazardous water pollutants, like chlorophenols and related compounds.
机译：污水污泥是开发一个作为前体潜在的廉价吸附剂都简单干燥和pyrol-ysis。考核为吸附剂去除从水溶液4-chlorophenol (4-CP)。干有机显示打赌表面积低比3 m ~ 2 / g,产生最大的吸附容量0.73更易4-CP C / g (pH值5.0和15。下的有机固体碳化相对温和的条件下允许获取材料打赌面积45 m ~ 2 / g,导致最大吸附的显著增加能力(1.36更易4-CP / g)。的起始物料(23%,d.b。)限制了千总孔隙度的发展的基础上。而Redlich-Peterson等温线方程最常用的朗谬尔和弗伦德里希方程不太满意的可能是因为总结性的发生吸附的现象。吸附了自发的放热自然的过程。碳化提供稳定物价的两种方法通过其转换成污水污泥廉价的低秩吸附剂可能有用的一些危险的水污染物,如氯酚和相关的化合物。

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