Novel Magnetic Pomelo Peel Biochar for Enhancing Pb(II) And Cu(II) Adsorption: Performance and Mechanism
Novel Magnetic Pomelo Peel Biochar for Enhancing Pb(II) And Cu(II) Adsorption: Performance and Mechanism
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DOI：
10.1007/s11270-020-04788-4
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发表时间：
2020-07-25
影响因子：
2.9
通讯作者：
Zeng, Ziping
中科院分区：
文献类型：
--
作者：
Chen, Yaoning;Liu, Yihuan;Zeng, Ziping
在550℃条件下，采用水热预处理与热解相结合的方法制备了一种新型磁性柚皮生物炭（MPPB），研究了生物炭对Pb（II）和Cu（II）的吸附性能。利用FTIR、SEM、XRD、XPS和zeta电位对生物炭进行表征。MPPB表面形貌粗糙、松散，带负电荷，含有羧基和羟基官能团，有利于吸附。MPPB对Pb（II）的最大吸附量为205.391 mg/g，对Cu（II）的最大吸附量为81.909 mg/g。拟二级动力学和Langmuir等温线较好地描述了生物炭的吸附行为。从XPS和XRD光谱的变化可以看出，金属吸附过程中发生了化学络合作用。共存阳离子与靶金属的竞争关系推断离子交换不是关键机制。与官能团的化学络合和金属间的静电吸引是MPPB的主要吸附机制。以柚皮为原料制备的MPPB是一种很有潜力的水净化吸附剂。
A novel magnetic pomelo peel biochar (MPPB) was prepared by hydrothermal pretreatment coupled with pyrolysis at 550 degrees C. Batch experiments were employed to investigate adsorption properties on biochar for Pb(II) and Cu(II). FTIR, SEM, XRD, XPS, and zeta potential were applied to characterize the biochar. The surface morphology of MPPB was rough, loose, and negatively charged and contained carboxyl and hydroxyl functional groups, which were favorable for adsorption. The MPPB showed excellent adsorption performances for Pb(II) with maximum capacity (205.391 mg/g), and the maximum amount on MPPB for Cu(II) was 81.909 mg/g. Pseudo-second-order kinetic and Langmuir isotherm depicted well with adsorption behavior on biochar. It could be concluded that chemical complexation occurs during metal adsorption from change of the spectra of XPS and XRD. The competitive relation of coexisting cations with target metal inferred that ion exchange is not a key mechanism. Chemical complexation with functional groups and electrostatic attraction between MPPB and metals are the main adsorption mechanisms. The MPPB developed from pomelo peel was testified to be a potential adsorbent for water purification.