| Literature DB >> 30851573 |
Sen Liu1, Jihui Li2, Shuang Xu1, Mengzhen Wang1, Yucang Zhang3, Xinghua Xue1.
Abstract
A phosphomolybdic acid promoted oxidative pyrolysis was described for preparation of banana pseudostem biochar. The strategy succeeded to introduce oxygen-containing groups onto the biochar surface at low temperature. In addition, pore channels were created, demonstrated by the SEM images of biochar prepared at 200 °C. Adsorption experiments showed that the biochar pyrolyzed at 200 °C exhibited much better adsorption capability than others pyrolyzed at higher temperatures for methylene blue (MB). The adsorption capability of biochar prepared at 200 °C was enhanced from 87.28 to 146.23 mg/g at 45 °C with phosphomolybdic acid modification. The enhancement of adsorption capacity could be ascribed to the increase of surface oxygen-containing functional groups and pore channels. In-situ generated carboxylic groups during adsorption and desorption played an important role in removal of MB. Adsorption of MB was mainly attributed to hydrogen bonding, electrostatic interactions and cation exchanges.Entities:
Keywords: Banana pseudostem; Biochar; Methylene blue; Oxidative pyrolysis; Phosphomolybdic acid
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Year: 2019 PMID： 30851573 DOI： 10.1016/j.biortech.2019.02.092
Source DB: PubMed Journal: Bioresour Technol ISSN： 0960-8524 Impact factor: 9.642