用于固定镉(II)的纳米羟基磷灰石改性烟秆生物炭:界面吸附行为与机理

IF 2.8 4区 工程技术 Q2 ENGINEERING, CHEMICAL
Processes Pub Date : 2024-09-07 DOI:10.3390/pr12091924
Tianfu Li, Xiaofei Li, Chaoran Shen, Dian Chen, Fuhua Li, Weicheng Xu, Xiaolian Wu, Yanping Bao
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引用次数: 0

摘要

生物炭是一种环保的多孔富碳材料,被广泛用于固定污染环境中的重金属。本研究将典型的农业废弃物烟草秆在 350 ℃ 和 550 ℃ 的共热解温度下制备成羟基磷灰石(HAP)改性的生物炭(TSB),以探索其镉(II)吸附行为和相关机理。XRD、SEM-EDS、FTIR和BET分析表明,羟基磷灰石成功地吸附到了TSB上,丰富了表面含氧官能团(P-O和羧基),使比表面积从2.52(TSB350)和3.63 m2/g(TSB550)提高到14.07(HAP-TSB350)和18.36 m2/g(HAP-TSB550)。TSB和HAP-TSB上的镉(II)吸附动力学用伪二阶模型进行了很好的描述。等温线结果表明,镉(II)在 HAP-TSB350 和 HAP-TSB550 上的最大吸附容量分别约为 13.17 和 14.50 mg/g,分别是 TSB350 和 TSB550 的 2.67 和 9.24 倍。随着 pH 值的升高,TSB 和 HAP-TSB 上的镉(II)吸附量显著增加,尤其是 HAP-TSB550。离子强度效应和 XPS 分析表明,HAP-TSB 上的镉(II)吸附主要是通过静电作用、与 Ca2+ 的阳离子交换、与 P-O 和 -COOH 的络合以及表面沉淀实现的。这些发现将为烟草农业废弃物在重金属污染地区修复中的再利用提供一种改良策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nano-Hydroxyapatite Modified Tobacco Stalk-Based Biochar for Immobilizing Cd(II): Interfacial Adsorption Behavior and Mechanisms
Biochar, an eco-friendly, porous carbon-rich material, is widely studied for immobilizing heavy metals in contaminated environments. This study prepared tobacco stalks, a typical agricultural waste, into biochar (TSB) modified by hydroxyapatite (HAP) at co-pyrolysis temperatures of 350 °C and 550 °C to explore its Cd(II) adsorption behavior and relevant mechanisms. XRD, SEM–EDS, FTIR, and BET analyses revealed that HAP successfully incorporated onto TSB, enriching the surface oxygen-containing functional groups (P–O and carboxyl), and contributing to the enhancement of the specific surface area from 2.52 (TSB350) and 3.63 m2/g (TSB550) to 14.07 (HAP–TSB350) and 18.36 m2/g (HAP–TSB550). The kinetics of Cd(II) adsorption onto TSB and HAP–TSB is well described by the pseudo-second-order model. Isotherm results revealed that the maximum adsorption capacities of Cd(II) on HAP–TSB350 and HAP–TSB550 were approximately 13.17 and 14.50 mg/g, 2.67 and 9.24 times those of TSB350 and TSB550, respectively. The Cd(II) adsorption amounts on TSBs and HAP–TSBs increased significantly with increasing pH, especially in HAP–TSB550. Ionic strength effects and XPS analysis showed that Cd(II) adsorption onto HAP–TSBs occurred mainly via electrostatic interaction, cation exchange with Ca2+, complexation with P–O and –COOH, and surface precipitation. These findings will provide a modification strategy for the reutilization of tobacco agricultural waste in the remediation of heavy metal contaminated areas.
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来源期刊
Processes
Processes Chemical Engineering-Bioengineering
CiteScore
5.10
自引率
11.40%
发文量
2239
审稿时长
14.11 days
期刊介绍: Processes (ISSN 2227-9717) provides an advanced forum for process related research in chemistry, biology and allied engineering fields. The journal publishes regular research papers, communications, letters, short notes and reviews. Our aim is to encourage researchers to publish their experimental, theoretical and computational results in as much detail as necessary. There is no restriction on paper length or number of figures and tables.
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