Background

Biosorption method for Cr(VI) removal from domestic and industrial wastewater is widely desirable technicality due to its high efficiency, natural affinity, selectivity, easily operation, low costs and eco-friendly procedures. The presented work demonstrates the sequestration of hexavalent chromium ion, Cr(VI) from contaminated water by the biosorbent Artemisia monosperma (AM) powder modified by trimethyloctadecylammonium bromide (TOAB).

Methods

Analytical tools of XRD, FTIR, SEM, EDS, TGA and XPS were used from one side to characterize the developed modified biosorbent TOAB@AM and from the other side to investigate the Cr(VI) adsorption. Operational parameters of pH, adsorbent dose, contact time, coexisting ions and temperature that affect adsorption process were optimized.

Significant Findings

Adsorption kinetics emerges the best linearity when applying the pseudo-second-order model referring to the chemisorption assumption in controlling sorption process of TOAB@AM biosorbent and Cr(VI) ions. Adsorption isothermal results are distinctly well fitted with Langmuir correlation. Furthermore, adsorption thermodynamics reveals the spontaneity and exothermic modality in adsorbing Cr(VI) onto TOAB@AM biosorbent with less randomness behavior. The optimal operational conditions for Cr (VI) removal are pH = 3; 0.1g dose of TOAB@AM; and 40 min contact time that result in adsorption capacity of Cr (VI) about 36.9 mg/g. Merits of low cost, high selectivity, and adsorptive potency of the novel TOAB@AM biosorbent towards Cr(VI) ions makes it a worthy alternative for remediating water sources from Cr(VI) contaminates within a facile and fast avenue.

中文翻译：

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使用浸渍在蒿属植物粉末上的三甲基十八烷基溴化铵选择性和有效封存地下水中的 Cr(VI)

背景

从生活和工业废水中去除 Cr(VI) 的生物吸附方法由于其高效、天然亲和力、选择性、易于操作、成本低和环保程序而被广泛采用。所提出的工作证明了通过三甲基十八烷基溴化铵 (TOAB) 改性的生物吸附剂单精子蒿(AM) 粉末从污染水中螯合六价铬离子 Cr(VI )。

方法

XRD、FTIR、SEM、EDS、TGA 和 XPS 分析工具一方面用于表征开发的改性生物吸附剂 TOAB@AM，另一方面用于研究 Cr(VI) 吸附。对影响吸附过程的pH值、吸附剂用量、接触时间、共存离子和温度等操作参数进行了优化。

重要发现

当应用拟二级模型参考化学吸附假设控制 TOAB@AM 生物吸附剂和 Cr(VI) 离子的吸附过程时，吸附动力学出现最佳线性。吸附等温结果与朗缪尔相关性明显吻合。此外，吸附热力学揭示了在 TOAB@AM 生物吸附剂上吸附 Cr(VI) 的自发性和放热模式，具有较少的随机行为。去除 Cr (VI) 的最佳操作条件是 pH = 3；0.1g 剂量的 TOAB@AM；和 40 分钟的接触时间导致 Cr (VI) 的吸附容量约为 36.9 mg/g。新型 TOAB@AM 生物吸附剂对 Cr(VI) 离子的低成本、高选择性和吸附能力的优点使其成为一种有价值的替代方法，可在轻松快速的途径中修复 Cr(VI) 污染的水源。