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首页> 外文期刊>Journal of the Taiwan Institute of Chemical Engineers >Preparation of MnOx-loaded biochar for Pb2+ removal: Adsorption performance and possible mechanism
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Preparation of MnOx-loaded biochar for Pb2+ removal: Adsorption performance and possible mechanism

机译：负载MnOx的生物炭去除Pb2 +的制备：吸附性能及其可能机理

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摘要

In order to increase Pb2+ adsorption capacity of biochar derived from rice husk, the present work explored a facile modification route based on the loading of manganese oxide (MnOx) nanoparticles. SEM, BET, TEM, FTIR and XPS analysis confirmed the successful loading of MnOx nanoparticles onto biochar. The maximum Pb2+ adsorption capacity for MnO loaded biochar (MOLBC) with MnOx coverage of 40% was as high as 86.5 mg g(-1), while that for blank biochar was as low as 14.7 mg g(-1). Specific surface area as high as 340.0 m(2) g(-1) was exhibited by 40%MOLBC, while the specific surface area of blank biochar was only 234.8 m(2) g(-1). The MOLBC demonstrated relatively high adsorption capacity for Pb2+, due to the formation of MnO), sphere complexes especially monodentate, as well as oxygen complexes on biochar surface. Besides this, pi-electron cloud system, decrease of electron density from sr-band of graphenic nature carbon due to addition of-COOH and induced vacancy defect of graphenic basal plane created on biochar surface was also considered to play a key role in Pb2+ adsorption. The results suggested that MOLBC could be promisingly implemented as an environmentally friendly and inexpensive adsorbent for Pb2+ removal from wastewater. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
机译：为了提高稻壳生物炭对Pb2 +的吸附能力，目前的工作探索了一种基于氧化锰（MnOx）纳米粒子负载量的简便修饰途径。 SEM，BET，TEM，FTIR和XPS分析证实了MnOx纳米颗粒已成功装载到生物炭上。 MnOx覆盖率为40％的负载MnO的生物炭（MOLBC）的最大Pb2 +吸附容量高达86.5 mg g（-1），而空白生物炭的最大Pb2 +吸附容量则低至14.7 mg g（-1）。比表面积高达340.0 m（2）g（-1）由40％MOLBC展示，而空白生物炭的比表面积仅为234.8 m（2）g（-1）。由于形成了MnO，球形配合物（尤其是单齿）以及生物炭表面的氧配合物，MOLBC表现出相对较高的Pb2 +吸附能力。除此之外，还认为π电子云系统，由于添加-COOH导致石墨烯天然碳sr带电子密度降低以及在生物炭表面上产生的石墨基面空位缺陷在Pb2 +吸附中起关键作用。 。结果表明，MOLBC有望作为一种环保且廉价的吸附剂用于废水中Pb2 +的去除。 （C）2016台湾化学工程师学会。由Elsevier B.V.发布。保留所有权利。

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