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A novel MnOx-impregnated on peanut shells derived biochar for high adsorption performance of Pb(II) and Cd(II): Behavior and mechanism
Surfaces and Interfaces ( IF 6.2 ) Pub Date : 2022-09-05 , DOI: 10.1016/j.surfin.2022.102323
Xueqiang Liu, Diandi Li, Jiguang Li, Jianle Wang, Shujie Liang, Hong Deng

Heavy metal ion pollution (e.g., Hg, Pb, Cr, Cd) that has a great threat to human health is a global concern, because of their great toxicity (e.g., carcinogenicity and mutagenicity). Therefore, it is necessary to find an economical and efficient technology to remove metal. In recent years, modified biochar plays an important role in the removal of heavy metal. However, most of the biochar modification methods rely on high temperature and long time, which limits their application in practical engineering. In this study, we firstly synthesized HMBC (MnOX-OBC, peanut shells as raw materials) using H2O2-NaOH method, where the materials only need to be modified for 10 min at ambient temperature to obtain high adsorption performance. The maximum Pb(Ⅱ) and Cd(Ⅱ) adsorption capacities of HMBC were 164.59 mg g1 and 36.77 mg g1, respectively, which were 7.2 times and 5.6 times that of the unmodified PBC (peanut shells derived biochar), and the main adsorption mechanisms were complexation, ion exchange, cation-π interaction and precipitation. The adsorption process of lead and cadmium by HMBC was more consistent with the Freundlich model and Pseudo-second-order adsorption kinetics. HMBC had high selectivity for lead and cadmium, and the adsorption performance of HMBC was basically not reduced after five cycles. The above experimental results show that the newly prepared HMBC has the potential to treat lead and cadmium industrial wastewater.



中文翻译:

一种新型 MnOx 浸渍花生壳衍生生物炭对 Pb(II) 和 Cd(II) 的高吸附性能:行为和机制

重金属离子污染(如Hg、Pb、Cr、Cd)对人类健康有很大威胁,因其毒性(如致癌性和致突变性)而受到全球关注。因此,有必要寻找一种经济高效的金属去除技术。近年来,改性生物炭在去除重金属方面发挥着重要作用。然而,大多数生物炭改性方法都依赖于高温和长时间,这限制了它们在实际工程中的应用。在本研究中,我们首先利用H 2 O 2合成了HMBC(MnO X -OBC,花生壳为原料)。-NaOH法,材料只需在常温下改性10分钟即可获得高吸附性能。HMBC 对 Pb(Ⅱ) 和 Cd(Ⅱ) 的最大吸附量分别为 164.59 mg g - 1和 36.77 mg g - 1,分别是未改性 PBC(花生壳衍生生物炭)的 7.2 倍和 5.6 倍,主要吸附机理为络合、离子交换、阳离子-π相互作用和沉淀。HMBC对铅和镉的吸附过程更符合Freundlich模型和伪二级吸附动力学. HMBC对铅和镉的选择性很高,5次循环后HMBC的吸附性能基本没有降低。上述实验结果表明,新制备的HMBC具有处理铅镉工业废水的潜力。

更新日期:2022-09-10
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