Chen Long, Mi Baobin, He Jiangnan, Li Yuchen, Zhou Zhi, Wu Fangfang
School of Chemistry and Materials Science, Hunan Engineering Research Center for Biochar, College of Agronomy, College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, China.
School of Chemistry and Materials Science, Hunan Engineering Research Center for Biochar, College of Agronomy, College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, China; Research Institute of Vegetables, Hunan Academy of Agriculture Sciences, Changsha 410125, China.
Bioresour Technol. 2023 May;376:128840. doi: 10.1016/j.biortech.2023.128840. Epub 2023 Mar 9.
In this study, functionalized banana peel biochar (BPB) was prepared by microwave-assisted pyrolysis for the first time to investigate its adsorption to malachite green (MG) dye. Adsorption experiments showed that the maximum adsorption capacity of BPB500 and BPB900 to malachite green reached 1790.30 and 2297.83 mg·g within 120 min. The adsorption behaviour was well-fitted by the pseudo-second-order kinetic model and Langmuir isotherm model, and ΔG < 0, ΔH > 0, indicated that the adsorption process was endothermic and spontaneous, dominated by chemisorption. The adsorption mechanism of MG dye on BPB included hydrophobic interaction, hydrogen bonding, π-π interaction, n-π interaction, and ion exchange. Meanwhile, through regeneration tests, simulated wastewater treatment experiments, and cost calculations, it was found that BPB has great potential for practical applications. This work demonstrated that microwave-assisted pyrolysis is a viable low-cost approach for producing excellent sorbents from biomass, and banana peel is a promising feedstock to prepare biochar for dye removal.
在本研究中，首次通过微波辅助热解制备了功能化香蕉皮生物炭（BPB），以研究其对孔雀石绿（MG）染料的吸附性能。吸附实验表明，BPB500和BPB900对孔雀石绿的最大吸附量在120分钟内分别达到1790.30和2297.83 mg·g。吸附行为符合准二级动力学模型和朗缪尔等温线模型，且ΔG < 0，ΔH > 0，表明吸附过程是吸热且自发的，以化学吸附为主。MG染料在BPB上的吸附机制包括疏水相互作用、氢键、π-π相互作用、n-π相互作用和离子交换。同时，通过再生试验、模拟废水处理实验和成本计算，发现BPB具有很大的实际应用潜力。这项工作表明，微波辅助热解是一种可行的低成本方法，可用于从生物质中制备优良的吸附剂，香蕉皮是制备用于去除染料的生物炭的一种有前景的原料。
