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首页> 外文期刊>Applied Surface Science >Determining roles of in-situ measured surface potentials of phase controlled synthesized MnO_2 nanostructures for superficial adsorption
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Determining roles of in-situ measured surface potentials of phase controlled synthesized MnO_2 nanostructures for superficial adsorption

机译：确定原位测量的相位控制合成MNO_2纳米结构的表面电位进行浅表吸附

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摘要

Adsorption is one of options for environmental remediation. Current works focused on designing nanostructures, and ex-situ measured specific area and zeta potential were main descriptors for the adsorption performance, leaving the materials' intrinsic features irrelevant to adsorption. Herein, to investigate the adsorption performance and adsorbent inherent characteristics, an in-situ measurement of zeta potential was presented by taking MnO2 adsorbing methylene blue (MB) as an example. The performance was randomly related between ex-situ measured specific areas and zeta potentials of MnO2, but the in-situ measured MnO2 zeta potentials in 10 and 100 mg.L-1 MB solutions both showed nonlinear hyperbolic relationship with the performance, confirming the significant role of in-situ zeta potentials. Furthermore, adsorption enhancement in low pH conditions was observed, for Mn(IV) oxidability promoted by acidic solutions, where MB redox was oxidized to the positively charged oxidized form, facilitating adsorption onto negatively charged MnO2. The adsorption performance of Mn0 2 with considerably low specific area was comparable to reported nanostructured metal oxide adsorbents, showing the importance of surface zeta potentials and oxidability. An insight into the adsorption affecting factors within the inherent features of adsorbents was presented through in-situ measured zeta potentials and pH dependent adsorption.
机译：吸附是环境修复的选择之一。目前的作品集中在设计纳米结构上，并且出原位测量的特定区域和Zeta电位是用于吸附性能的主要描述符，使材料的内在特征无关吸附。在此，为了研究吸附性能和吸附剂的固有特征，通过将MnO 2吸附亚甲基蓝（MB）作为示例，通过Zeta电位出于原位测量。性能与MnO 2的Zetu测量的特定区域和Zeta电位之间的性能随机相关，但原位测量的MnO2 Zeta电位在10和100mg.L-1 MB解决方案中，均显示出与性能的非线性双曲关系，确认重要性原位Zeta潜力的作用。此外，观察到低pH条件的吸附增强，用于酸性溶液促进的Mn（iv）氧化性，其中将Mb氧化还原氧化成带正电荷的氧化形式，促进吸附在带负电荷的MnO 2上。 MN0 2具有相当低的特异性区域的MNO 2的吸附性能与报道的纳米结构金属氧化物吸附剂相当，显示出表面Zeta电位和氧化性的重要性。通过原位测量Zeta电位和pH依赖性吸附，给出了对吸附剂固有特征内的吸附影响因子的洞察。

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