Surfactant-modified zein nanoparticles adsorbents for ultrafast and efficient removal of Cr(VI)

IF 7.7 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Qing Shen , Xiaomeng Xu , Xiaojing Liang , Cong Tang , Xiaoping Bai , Shijun Shao , Qing Liang , Shuqing Dong
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Abstract

The adsorption and removal of heavy metal ions Cr(VI) is of great significance for human health and ecological environment. Here, an ultrafast and high efficient adsorbent for Cr(VI) was developed based on cetyltrimethylammonium bromide (CTAB)-modified zein nanoparticles (C-ZNPs). In comparison to pristine zein nanoparticles (ZNPs) (11.199 m2 g−1), the surfactant-modified C-ZNPs exhibited larger specific surface area (17.002 m2 g−1). Moreover, C-ZNPs had superior dispersion and more positive charge distribution, which contributed to the improvement for adsorption performance. The results showed that the saturated adsorption of Cr(VI) was reached up to 192.27 mg/g using the C-ZNPs nanosorbent at T = 298 K, pH = 4, t = 10s, and C0 = 125 mg/L. The removal rate was significantly faster than that reported natural polymer-based adsorbents. The experimental values were followed Freundich isothermal model and pseudo-second-order kinetic model, indicating that the adsorption occurred primarily through a multimolecular layer adsorption process, with a strong emphasis on chemisorption. Mechanistic investigations further revealed that the adsorption of Cr(VI) onto C-ZNPs was mediated by various interactions, including electrostatic attraction, complexation, and ion exchange. These findings provide insights into the efficient removal of Cr(VI) by C-ZNPs and suggest potential applications in water treatment and environmental remediation.

Abstract Image

超快高效去除六价铬的表面活性剂改性玉米蛋白纳米颗粒吸附剂。
重金属离子 Cr(VI) 的吸附和去除对人类健康和生态环境具有重要意义。本文以十六烷基三甲基溴化铵(CTAB)修饰的玉米蛋白纳米颗粒(C-ZNPs)为基础,开发了一种超快速、高效的 Cr(VI) 吸附剂。与原始玉米蛋白纳米颗粒(ZNPs)(11.199 m2-g-1)相比,表面活性剂修饰的 C-ZNPs 具有更大的比表面积(17.002 m2-g-1)。此外,C-ZNPs 具有更好的分散性和更多的正电荷分布,这有助于改善吸附性能。结果表明,在 T = 298 K、pH = 4、t = 10s 和 C0 = 125 mg/L 条件下,C-ZNPs 纳米吸附剂对 Cr(VI) 的饱和吸附达到 192.27 mg/g。其去除率明显快于所报道的天然聚合物基吸附剂。实验值遵循弗兰迪奇等温模型和伪秒阶动力学模型,表明吸附主要通过多分子层吸附过程进行,化学吸附作用十分突出。机理研究进一步表明,C-ZNPs 对 Cr(VI) 的吸附是由各种相互作用介导的,包括静电吸引、络合和离子交换。这些发现为 C-ZNPs 高效去除六价铬提供了启示,并提出了在水处理和环境修复中的潜在应用。
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来源期刊
Environmental Research
Environmental Research 环境科学-公共卫生、环境卫生与职业卫生
CiteScore
12.60
自引率
8.40%
发文量
2480
审稿时长
4.7 months
期刊介绍: The Environmental Research journal presents a broad range of interdisciplinary research, focused on addressing worldwide environmental concerns and featuring innovative findings. Our publication strives to explore relevant anthropogenic issues across various environmental sectors, showcasing practical applications in real-life settings.
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