School of Energy and Environment Science, Yunnan Normal University, Kunming, 650500, People's Republic of China.
Yunnan Key Laboratory of Rural Energy Engineering, Kunming, 650500, People's Republic of China.
Sci Rep. 2022 Aug 20;12(1):14242. doi: 10.1038/s41598-022-18598-7.
The widely spread chromium (Cr) contamination is rising environmental concerns, while the reutilization of agro-industrial by-products are also urgently demanded due to their potential risks. In this study, we prepared the integrated micro-electrolysis composites (IMC) through a facile one-pot method with red mud and rice straw. The effects of components relatively mass ratios as well as pyrolysis temperature were analyzed. The XRD, XPS, SEM, FTIR, and various techniques proved the IMC was successfully synthesized, which was also used to analyze the reaction mechanisms. In this study, the dosage of IMC, pH, adsorption time, and temperature of adsorption processes were explored, in the adsorption experiment of Cr(VI), dosage of IMC was 2 g/L (pH 6, 25 °C, and 200 rpm) for isothermal, while the concentration and contact time were also varied. According to the batch experiments, IMC exhibited acceptable removal capacity (190.6 mg/g) on Cr(VI) and the efficiency reached 97.74%. The removal mechanisms of adsorbed Cr(VI) were mainly elaborated as chemical reduction, complexation, co-precipitation, and physical adherence. All these results shed light on the facile preparation and agro-industrial by-products recycled as engineering materials for the heavy metals decontamination in wastewater.
广泛分布的铬 (Cr) 污染引起了人们对环境的关注，而农业工业副产品的再利用也因潜在风险而迫在眉睫。在本研究中，我们通过简便的一锅法用赤泥和稻草制备了集成微电解复合材料 (IMC)。分析了组分相对质量比和热解温度的影响。XRD、XPS、SEM、FTIR 及各种技术证明 IMC 已成功合成，并用于分析反应机制。在本研究中，探讨了 IMC 的用量、pH 值、吸附时间和吸附温度等参数，在 Cr(VI)的吸附实验中，在等温条件下，IMC 的用量为 2 g/L(pH 6、25°C 和 200 rpm)，同时还改变了浓度和接触时间。根据批量实验，IMC 对 Cr(VI)具有良好的去除能力（190.6 mg/g），去除效率达到 97.74%。吸附 Cr(VI)的去除机制主要阐述为化学还原、络合、共沉淀和物理附着。所有这些结果都为简便的制备方法和农业工业副产品的回收利用提供了启示，可作为废水重金属污染治理的工程材料。
