Agro-Products Quality Safety and Testing Technology Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, People's Republic of China.
Department of Energy Chemical Engineering, Guangxi University, Nanning, People's Republic of China.
Environ Technol. 2021 Jan;42(3):337-350. doi: 10.1080/09593330.2019.1627425. Epub 2019 Jun 13.
In this work, using an agricultural waste of sugarcane bagasse, new biomass of magnetic sugarcane bagasse activated carbon (MSBAC) has been successfully prepared by a simple microwave method. The composition and structure of MSBAC were characterised by SEM, XRD, BET, and FT-IR. It was found that MSBAC was a mesoporous material with a loose structure and rough surface, and it had a high specific surface area. The pH was 4.1, and MSBAC presented a greater amount of acid functional groups than basic groups, making it efficient for adsorption of cationic dye. To study the adsorption ability of MSBAC, methylene blue (MB) was selected as sample pollutant. Effects of pH, MSBAC dosage, initial MB concentration, temperature, time on the adsorption of MB, and the possibility of regeneration of MSBAC were investigated. The adsorption results showed that the maximum adsorption capacity was 36.14 mg·g, and the pH had no significant effect on the MB adsorption in the range of 2-10. The equilibrium data fitted Langmuir isotherm, and the adsorption kinetic data obeyed pseudo-second-order kinetic model. The adsorption process involving the surface diffusion and film diffusion. The positive value of Δ revealed the adsorption behaviour was an endothermic process. The salt concentration had a negative effect on MB removal. MSBAC had a good magnetic separation performance. The used MSBAC could be regenerated by a simple calcination method under the temperature of 300℃ for 30 min.
在这项工作中，利用甘蔗渣这一农业废弃物，通过简单的微波法成功制备了新型生物质磁性甘蔗渣活性炭（MSBAC）。采用 SEM、XRD、BET 和 FT-IR 对 MSBAC 的组成和结构进行了表征。结果表明，MSBAC 是一种具有疏松结构和粗糙表面的中孔材料，具有较高的比表面积。pH 值为 4.1，MSBAC 呈现出比碱性基团更多的酸性官能团，使其对阳离子染料的吸附效率更高。为了研究 MSBAC 的吸附能力，选择亚甲基蓝（MB）作为样品污染物。考察了 pH 值、MSBAC 用量、MB 初始浓度、温度、时间对 MB 吸附的影响，以及 MSBAC 再生的可能性。吸附结果表明，最大吸附容量为 36.14 mg·g，MB 吸附在 2-10 的范围内，pH 值对其没有显著影响。平衡数据符合朗缪尔等温线，吸附动力学数据符合准二级动力学模型。吸附过程涉及表面扩散和膜扩散。Δ的正值表明吸附行为是一个吸热过程。盐浓度对 MB 的去除有负面影响。MSBAC 具有良好的磁分离性能。用过的 MSBAC 可以通过在 300℃下简单的煅烧方法在 30 min 内再生。
