Preparation of thiol modified olive stone-based biochar for the removal of Hg (II)from aqueous solutions

IF 1 Q4 ENGINEERING, ENVIRONMENTAL Journal of Environmental Engineering and Science Pub Date : 2023-11-24 DOI:10.1680/jenes.23.00090
M. Gómez-Marroquín, Dalia Carbonel, Stephanie Esquivel, Henry Colorado
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Abstract

Mercury is a heavy metal whose toxicity poses significant environmental and health risks. Utilizing biochar prepared from biomass waste is a straightforward and effective method for removing mercury from water. This research centered on producing a thiol-functionalized biochar derived from olive stone waste for the removal of Hg (II) from aqueous solutions. Characterization analyses confirmed the successful functionalization. The biochar, despite having a limited specific surface area (4.14 m2/g) due to raw material nature and pyrolysis conditions, exhibited a notable ability for Hg (II) adsorption, primarily attributed to the thiol-modified surface. Adsorption was assessed using a 2^3 factorial design, with the variables being the adsorption time, biochar dose, and initial Hg (II) concentration in the solution. The biochar dose emerged as the most influential factor, followed by the adsorption time and, lastly the initial Hg (II) concentration. The peak removal efficiency of the model stood at 98.19 %. Kinetics aligned with the pseudo-first-order and intra-particle diffusion models, suggesting a surface adsorption mechanism coupled with pore diffusion. This work accentuates the potential of olive-derived biochar, when thiol-enhanced, in treating aqueous systems contaminated with Hg (II).
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制备硫醇改性橄榄石基生物炭,用于去除水溶液中的汞(II)
汞是一种重金属,其毒性对环境和健康构成重大威胁。利用从生物质废物中制备的生物炭是去除水中汞的一种直接有效的方法。这项研究的重点是利用橄榄石废料制备硫醇功能化生物炭,用于去除水溶液中的汞(II)。表征分析证实了功能化的成功。尽管生物炭的比表面积(4.14 m2/g)因原料性质和热解条件而有限,但其吸附汞(II)的能力却十分显著,这主要归功于硫醇修饰的表面。吸附评估采用 2^3 因子设计,变量为吸附时间、生物炭剂量和溶液中的汞(II)初始浓度。生物炭剂量是影响最大的因素,其次是吸附时间,最后是初始汞(II)浓度。该模型的峰值去除率为 98.19%。动力学符合伪一阶和粒内扩散模型,表明表面吸附机制与孔隙扩散相结合。这项研究突出了橄榄提取的生物炭在硫醇增强后处理受 Hg (II) 污染的水系统的潜力。
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来源期刊
CiteScore
1.60
自引率
0.00%
发文量
20
审稿时长
12 months
期刊介绍: Journal of Environmental Engineering and Science is an international, peer-reviewed publication providing a forum for the dissemination of environmental research, encouraging interdisciplinary research collaboration to address environmental problems. It addresses all aspects of environmental engineering and applied environmental science, with the exception of noise, radiation and light.
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