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Cobalt(II) removal from synthetic wastewater by adsorption on South African coal fly ash

机译:通过对南非煤粉粉煤灰的吸附来从合成废水中除去钴(II)

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摘要

Advanced wastewater-treatment techniques such as adsorption are essential in the removal of non- biodegradable toxic wastes from water. In this study, the use of South African coal fly ash, an industrial byproduct, has been investigated as a potential replacement for the current costly adsorbents used for removing heavy metals from wastewater. We utilised coal fly ash for the adsorption of cobalt(II) ions from synthetic petrochemical wastewater and characterised its performance. A two-level three-factor full-factorial design was successfully employed for experimental design and analysis of the results. The combined effects of pH, initial concentration and adsorbent dose on cobalt(II) removal were assessed using response surface methodology. Although the focus was on removal of cobalt(II), the adsorption was carried out in the presence of phenol and other heavy metal ions using the batch technique. The applicability of the Freundlich and Langmuir models to the equilibrium data was tested. Consequently, the equilibrium data was found to conform more favourably to the Freundlich isotherm than to the Langmuir isotherm; in this case, the coal fly ash had a maximum adsorption capacity of 0.401 mg/g for cobalt(II). We conclude that South African coal fly ash, as a natural, abundant and low-cost adsorbent, might be a suitable local alternative for elimination of cobalt(II) from aqueous solutions.
机译:先进废水处理技术,例如吸附在从水中除去不可生物降解有毒废物的必不可少的。在这项研究中,利用南非的粉煤灰,工业副产物,已经考察了作为一个潜在的替代品用于去除废水中重金属的现状昂贵的吸附剂。我们利用煤飞灰为钴的吸附(II)由合成废水石化离子和其特征在于它的性能。一个两级三因素的全因子设计已成功用于实验设计和结果的分析。响应面法pH值,初始浓度和吸附剂剂量对钴(II)去除的组合效应进行了评估。虽然重点是去除钴(II)的,吸附在苯酚,并使用间歇技术等重金属离子的存在下进行。的Freundlich和朗缪尔模型来平衡数据的适用性进行了测试。因此,平衡数据被发现有利更符合于Freundlich等温比Langmuir等温;在这种情况下,煤飞灰具有0.401毫克/克钴(II)的最大吸附能力。我们的结论是南非的粉煤灰,作为一种天然的,丰富的,低成本的吸附剂,可能是从水溶液中钴的消除(II)合适的地方选择。

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