伽马辐照丙烯酸接枝锯末(SD-g-AAc)的合成,用于吸附水溶液中的三价铬

IF 5.4 Q2 ENGINEERING, ENVIRONMENTAL Journal of hazardous materials advances Pub Date : 2024-04-16 DOI:10.1016/j.hazadv.2024.100427
Sobur Ahmed , Abrar Shahriar , Nazia Rahman , Md. Zahangir Alam , Mohammad Nurnabi
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引用次数: 0

摘要

制革厂排放的铬造成的水污染是环境和公众健康的一个严重问题。在向地表水排放之前,迫切需要去除制革废水中的铬。在这项研究中,在空气和莫尔盐存在的情况下,采用伽马射线辐照法用丙烯酸接枝 Tectona grandis 锯屑,制备了丙烯酸接枝锯屑。用 NaOH 对其进行处理,并通过扫描电镜和傅立叶变换红外光谱研究了改性锯末的表面形貌和官能团的特征。批量吸附研究考察了溶液 pH 值、吸附剂用量、吸附时间和初始 Cr(III) 离子浓度的影响。研究发现该过程与 pH 值、温度和浓度有关。应用 Langmuir 和 Freundlich 等温线深入研究了吸附过程,发现 Langmuir 等温线模型与实验数据拟合良好(R2 值为 0.983)。在 25 °C 时,丙烯酸接枝锯屑对水溶液中 Cr(III) 的最大单层吸附容量为 21.55 mg g-1。采用伪一阶和伪二阶动力学模型分析了这一过程的动力学,发现实验过程遵循伪二阶动力学模型,即化学吸附。这项研究揭示了丙烯酸接枝锯屑在去除制革废水中的 Cr(III) 方面具有相当大的潜力。
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Synthesis of gamma irradiated acrylic acid-grafted-sawdust (SD-g-AAc) for trivalent chromium adsorption from aqueous solution

Water pollution caused by chromium released from tannery is a serious concern to the environment and public health. Chromium removal from tannery effluent is a crying need before discharging to the surface water. In this study, acrylic acid-grafted sawdust was prepared by Tectona grandis sawdust grafting with acrylic acid employing gamma irradiation in the presence of air and Mohr's salt. It was treated with NaOH and the characterization of surface morphology and functional groups of modified sawdust was studied by SEM and FTIR.. The effects of solution pH, adsorbent dosage, adsorption time, and initial Cr(III) ion concentration were investigated by batch sorption studies. The process was found to be pH, temperature and concentration dependent. Langmuir and Freundlich isotherms were applied to realize the adsorption process in depth, and it was found that the Langmuir isotherm model fitted well with experimental data (R2 value of 0.983). The maximum monolayer adsorption capacity of acrylic acid-grafted sawdust for Cr(III) from aquous solution was found to be 21.55 mg g-1 at 25 °C. Pseudo-first-order and pseudo-second-order kinetic models were employed to analyze the kinetics of the process, and it was found that the experimental process followed the pseudo-second-order kinetic model, i.e. chemisorption. This study revealed that acrylic acid-grafted sawdust has a decent potential for the removal of Cr(III) from tannery effluents.

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来源期刊
Journal of hazardous materials advances
Journal of hazardous materials advances Environmental Engineering
CiteScore
4.80
自引率
0.00%
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0
审稿时长
50 days
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