Aqueous Cr (VI) removal performance of an invasive plant-derived biochar modified by Mg/Al-layered double hydroxides

IF 4.7 3区材料科学 Q2 CHEMISTRY, PHYSICAL Colloid and Interface Science Communications Pub Date : 2023-03-01 DOI:10.1016/j.colcom.2023.100700

Xiaoying Li , Zhaoji Shi , Jiaen Zhang , Tian Gan , Zeheng Xiao

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引用次数: 6

Abstract

In this study, MgAl layered double hydroxides (Mg-Al/LDH)-decorated invasive plant (Praxelis clematidea)-derived biochar (MgAl/LDH-PBC) were prepared by the co-precipitation method. The characterization results revealed that the modified biochar surface offered more active adsorption sites, facilitating the Cr (VI) adsorption. MgAl/LDH-PBC showed an excellent adsorption capacity of 177.88 mg/g in a monolayer, with a rapid uptake equilibrium within 180 min. In addition, even after five cycles, the desorption rates remained at about 85%, and the Cr (VI) adsorption was quite stable despite the presence of a number of other ions. Moreover, MgAl/LDH-PBC bonded efficiently with Cr (VI) via electrostatic interaction, oxidation-reduction reaction, ion-exchange reaction, complexation, and co-precipitation. Based on these findings, MgAl/LDH-PBC may be used as an adsorbent for the removal of Cr (VI) from sewage and the management of invasive plant species.

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Mg/ al层状双氢氧化物修饰的入侵性植物源生物炭的水中Cr (VI)去除性能

本研究采用共沉淀法制备了MgAl层状双氢氧化物（Mg-Al/LDH）修饰入侵植物（Praxelis Clmatidea）衍生的生物炭（MgAl/LDH-PCB）。表征结果表明，改性后的生物炭表面提供了更多的活性吸附位点，有利于Cr（VI）的吸附。MgAl/LDH-PCB在单层中表现出177.88mg/g的优异吸附能力，在180分钟内达到快速吸收平衡。此外，即使在五次循环后，解吸率仍保持在约85%，并且尽管存在许多其他离子，Cr（VI）吸附仍相当稳定。此外，MgAl/LDH-PCB通过静电相互作用、氧化还原反应、离子交换反应、络合和共沉淀与Cr（VI）有效结合。基于这些发现，MgAl/LDH-PC可以用作从污水中去除Cr（VI）和管理入侵植物物种的吸附剂。

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来源期刊

Colloid and Interface Science Communications Materials Science-Materials Chemistry

CiteScore

9.40

自引率

6.70%

发文量

125

审稿时长

43 days

期刊介绍： Colloid and Interface Science Communications provides a forum for the highest visibility and rapid publication of short initial reports on new fundamental concepts, research findings, and topical applications at the forefront of the increasingly interdisciplinary area of colloid and interface science.