China Tobacco Hubei Industrial Co., Ltd., Wuhan, People's Republic of China.
Hubei Xinye Reconstituted Tobacco Development Co., Ltd, Wuhan, People's Republic of China.
Environ Technol. 2022 Jul;43(18):2855-2866. doi: 10.1080/09593330.2021.1906328. Epub 2021 Mar 30.
In this study, KMnO modification was proved to effectively increase the Ni adsorption capacity of biomass. In order to clarify the KMnO modification mechanism, the Ni adsorption characteristics of KMnO modified corncob (PPCB) under adsorption time, pH and Ni concentration were studied. The results showed that the adsorption was the pseudo second-order kinetic process, indicating that chemisorption was the dominated process, which followed the Langmuir isotherm model and the highest Ni adsorption capacity of PPCB reached 35.6 mg/g. By KMnO modification, the corncob was oxidized to generate carboxylates, and the MnO (reduction product) was loaded on the modified corncob, both carboxylates and MnO increased the Ni adsorption capacity of PPCB. The molecular dynamic results indicated the carboxylate structures had the strongest adsorption capacity. Moreover, the Ni removal efficiency of KMnO modified biomass decreased linearly with the increase of lignin content in biomass, while KMnO modified lignin showed a good adsorption performance, indicating that the cross-linked structures between lignin and other components in the biomass could inhibit the adsorption capacity of PPCB.
在这项研究中，KMnO 改性被证明可以有效地提高生物质对镍的吸附能力。为了阐明 KMnO 改性的机制，研究了吸附时间、pH 值和镍浓度对 KMnO 改性玉米芯（PPCB）的镍吸附特性。结果表明，吸附是伪二级动力学过程，表明化学吸附是主要过程，符合 Langmuir 等温模型，PPCB 的最大镍吸附容量达到 35.6mg/g。通过 KMnO 改性，玉米芯被氧化生成羧酸盐，MnO（还原产物）负载在改性玉米芯上，羧酸盐和 MnO 都提高了 PPCB 的镍吸附能力。分子动力学结果表明，羧酸盐结构具有最强的吸附能力。此外，随着生物质中木质素含量的增加，KMnO 改性生物质的镍去除效率呈线性下降，而 KMnO 改性木质素表现出良好的吸附性能，表明木质素与生物质中其他成分之间的交联结构可以抑制 PPCB 的吸附能力。
