Removal of Phenolic Compounds from Aqueous Solutions Using Sludge-Based Activated Carbons Prepared by Conventional Heating and Microwave-Assisted Pyrolysis
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- 作者：Glaydson S. dos Reis ; Matthew A. Adebayo ; Carlos H. Sampaio…
- 关键词：Sewage sludge ; Microwave and conventional heating ; Activated carbons ; Phenolic compounds ; Hydroquinone ; Adsorption mechanism ; Simulated effluents
- 刊名：Water, Air, & Soil Pollution
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：228
- 期：1
- 全文大小：
- 刊物类别：Earth and Environmental Science
- 刊物主题：Environment, general; Water Quality/Water Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Soil Science & Conservation; Hydrogeology; Climate Change/Climate Change Impacts;
- 出版者：Springer International Publishing
- ISSN：1573-2932
- 卷排序：228
文摘
Sludge-derived activated carbons (ACs) were prepared by conventional heating and microwave pyrolysis. The ACs were characterized using several analytical and functional techniques and used for removal of six phenolic compounds from aqueous solutions. The adsorbents exhibited similar features and possessed hydrophobic surfaces. The ACs were assigned mesoporous materials, with specific surface areas of up to 641 and 540 m2 g−1 for CAC-500 and MAC-980, respectively. The preliminary results indicated that phenol removal onto the ACs increased in the order: m-cresol < phenol < o-cresol < 2-chrorophenol < 2-nitrophenol < hydroquinone. Hydroquinone exhibited the highest adsorption capacity and was chosen to continue the remaining part of the experimental work—kinetic and isothermal studies. The adsorption kinetic and isotherm data were well described by the Avrami fractionary order and Redlich–Peterson models, respectively. The maximum amounts (Qmax) of hydroquinone adsorbed at 25 °C were too high, reaching 1218.3 and 1202.1 mg g−1 for CAC-500 and MAC-980, respectively. The mechanism of adsorption was proposed in this work, and it was suggested that donor–acceptor complex and π–π interactions play major roles in the adsorption process. The adsorbents were also tested on simulated effluents. The two ACs displayed good efficiency for the treatment of industrial simulated effluents.