Urea-modified hazelnut shell biochar (N-HSB) for efficient Cr(VI) removal: Performance and mechanism insights

IF 3.5 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology Pub Date : 2024-08-13 DOI:10.1016/j.jconhyd.2024.104414

Yuting Zhang , Yuwei Tang , Baoming Jin , Ruiping Yan , Li Zhang , Yilong Li , Jinchunzi Li , Shuang Liang

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引用次数: 0

Abstract

Composite with a high specific surface area of 224.62 m² g⁻¹ was prepared by adding urea as a nitrogen source to hazelnut shell biochar (HSB). Nitrogen doping significantly enhanced the ability of biochar for Cr(VI) elimination, achieving twice the removal efficiency of unmodified biochar. The impacts of varying the pH and initial concentrations on Cr(VI) removal by urea-modified biochar (N-HSB) were investigated. The Cr(VI) removal by N-HSB was better described by intra particle diffusion model and pseudo-second order kinetic model under optimal conditions. Furthermore, XPS, FTIR, SEM, and BET analyses were used to verify the pivotal roles of oxygen- and nitrogen-containing functional groups. Electrostatic attraction, redox reaction, and complexation constituted the principal mechanisms facilitating Cr(VI) elimination by N-HSB. This study demonstrated that the modification of biochar with urea as a nitrogen source represented a promising strategy for enhancing the removal capacity of biochar for Cr(VI) in aqueous environments.

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尿素改性榛子壳生物炭（N-HSB）用于高效去除六价铬：性能和机理研究。

通过在榛子壳生物炭（HSB）中添加尿素作为氮源，制备了具有 224.62 m2 g-1 高比表面积的复合材料。掺氮大大提高了生物炭去除六价铬的能力，去除效率是未改性生物炭的两倍。研究了改变 pH 值和初始浓度对尿素改性生物炭（N-HSB）去除六价铬的影响。在最佳条件下，N-HSB 的颗粒内扩散模型和伪二阶动力学模型能更好地描述其对六价铬的去除效果。此外，还利用 XPS、傅立叶变换红外光谱、扫描电镜和 BET 分析验证了含氧和含氮官能团的关键作用。静电吸引、氧化还原反应和络合作用构成了 N-HSB 消除六价铬的主要机制。这项研究表明，用尿素作为氮源对生物炭进行改性是提高生物炭在水环境中去除六价铬能力的一种有效策略。

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来源期刊

Journal of contaminant hydrology 环境科学-地球科学综合

CiteScore

6.80

自引率

2.80%

发文量

129

审稿时长

68 days

期刊介绍： The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.