Characterization of mesoporous activated carbons prepared by pyrolysis of sewage sludge with pyrolusite |
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Authors: | Chen Liu Zhengguang Tang Yao Chen Shijun Su Wenju Jiang |
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Institution: | aCollege of Architecture and Environment, Sichuan University, Chengdu 610065, China |
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Abstract: | Activated carbons were prepared from sewage sludge by chemical activation. Pyrolusite was added as a catalyst during activation and carbonization. The influence of the mineral addition on the properties of the activated carbons produced was evaluated. The results show that activated carbons from pyrolusite-supplemented sewage sludge had up to a 75% higher BET surface area and up to a 66% increase in mesoporosity over ordinary sludge-based activated carbons. Batch adsorption experiments applying the prepared adsorbents to synthetic dye wastewater treatment yielded adsorption data well fitted to the Langmuir isotherm. The adsorbents from pyrolusite-supplemented sludges performed better in dye removal than those without mineral addition, with the carbon from pyrolusite-augmented sludge T2 presenting a significant increase in maximum adsorption capacity of 50 mg/g. The properties of the adsorbents were improved during pyrolusite-catalyzed pyrolysis via enhancement of mesopore production, thus the mesopore channels may provide fast mass transfer for large molecules like dyes. |
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Keywords: | Sewage sludge Pyrolusite Activated carbon Catalyst |
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