Removal of methylene blue from aqueous solutions by biochar prepared from the pyrolysis of mixed municipal discarded material

被引:133
|
作者
Hoslett, John [1 ]
Ghazal, Heba [2 ]
Mohamad, Nour [1 ]
Jouhara, Hussam [1 ]
机构
[1] Brunel Univ London, Coll Engn Design & Phys Sci, Kingston Lane, Uxbridge UB8 3PH, Middx, England
[2] Kingston Univ, Sch Pharm & Chem, Kingston Upon Thames KT1 2EE, Surrey, England
基金
英国工程与自然科学研究理事会;
关键词
Pyrolysis; Methylene blue; Biochar; Mixed municipal discarded material; POLYCYCLIC AROMATIC-HYDROCARBONS; SOLID-WASTE; SEWAGE-SLUDGE; AGRICULTURAL PESTICIDES; ANTIBIOTIC-RESISTANCE; ORGANIC-MATTER; WATER-QUALITY; LOW-COST; ADSORPTION; SORPTION;
D O I
10.1016/j.scitotenv.2020.136832
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This paper investigates the adsorption of organic compounds in aqueous solution to biochar adsorbent, using methylene blue as an indicator for adsorption. Biochar was produced by the pyrolysis of mixed municipal discarded material in an innovative heat pipe reactor, the pyrolysis temperature was held at 300 degrees C for 12 h. Biochar produced under these conditions was found to have oxygen containing functional groups that are beneficial to the adsorption of methylene blue as well as graphitic structures suggesting potential sites for pi-pi interactions with methylene blue. Methylene Blue followed the pseudo second order kinetic model with higher R-2 values than both the pseudo first order kinetic and intrapartide diffusion models. The adsorption also closely fit the Langmuir isotherm rather than the Freundlich model, suggesting monolayer adsorption rather than multilayer adsorption. Maximum adsorption capacity was observed at 72 mg/g for initial concentration of 100 mg/I Methylene blue in aqueous solution. The amount of Methylene blue adsorbed increased with increasing initial concentration as expected. The adsorption mechanisms are likely pi-pi interactions between methylene blue and the graphitic structures in the biochar which are shown to be present in Raman spectroscopy, as well as electrostatic attraction and ionic bonding between negatively charged surface sites on the char and the positive charge on the dissolved methylene blue molecules. The results show that biochar obtained from mixed waste could be employed as a low-cost and effective tool in water treatment for the removal of basic dyes and potentially other organic impurities. (C) 2020 Elsevier B.V. All rights reserved.
引用
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页数:11
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