ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Yuxing Tong,Qunshan Yan,Song Gao,Bin Xiong,Xiangbing Tang,Zhichang Liu,Pengfei Li,Ming Huang,Ziwei Wang,Xi Le,Wei Pei,Zejun Dai,Zhe Xiong,Yi Wang
In this study, KMnO4 modification was proved to effectively increase the Ni2+ adsorption capacity of biomass. In order to clarify the KMnO4 modification mechanism, the Ni2+ adsorption characteristics of KMnO4 modified corncob (PPCB) under adsorption time, pH and Ni2+ 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 Ni2+ adsorption capacity of PPCB reached 35.6 mg/g. By KMnO4 modification, the corncob was oxidized to generate carboxylates, and the MnO2 (reduction product) was loaded on the modified corncob, both carboxylates and MnO2 increased the Ni2+ adsorption capacity of PPCB. The molecular dynamic results indicated the carboxylate structures had the strongest adsorption capacity. Moreover, the Ni2+ removal efficiency of KMnO4 modified biomass decreased linearly with the increase of lignin content in biomass, while KMnO4 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.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL PAPERS
·
2020
·Vol. 75
·期 3
·1279-1289
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IF 1.68
Yu Li,Chen Nanjun,Chen Wenjiao,Liu Cailin,Ren Xianyan,Yang Haijun,Lin Shudong
In Liquid Phase Catalytic Exchange (LPCE), the strength and hydrophobicity of styrene-divinylbenzene copolymer (SDB) carrier are key limitation factors for practical applications. In this paper, a surface-modified nano-SiO 2 (KH570-SiO 2 ) was used to improve the strength and hydrophobicity of SDB. Then, copolymerization of KH570SiO 2 with St, DVB to produce KH570-SiO 2 /SDB, Divinyl benzene (DVB), styrene (St) glycidyl methacrylate (GMA) to produce KH570-SiO 2 /GMA/SDB. The two kinds of new carriers were characterized by scanning electron microscope, static water contact angle, N 2 adsorption–desorption, transform infrared spectrometry and thermogravimetric analysis. Compared with SDB, both KH570-SiO 2 /SDB and KH570SiO 2 /GMA/SDB show better performances, such as a higher hydrophobicity(147° and 145°, respective), a higher strength(107.11 N and 115.37 N, respectively), a better thermal stability(373.8 and 435.67 ℃, respectively), and a larger specific surface area(487.253 and 463.673 m 2 /g, respective). The Nickel ion was uesd as the model ion of Platinum ion. And then the Ni 2+ adsorption performances of KH570-SiO 2 /SDB and KH570-SiO 2 /GMA/SDB were studied. Experiments show that KH570-SiO 2 /GMA/SDB has a much higher adsorption rate and a bigger adsorption amount. Refinement indicates that the adsorption behaviors of SDB, KH570-SiO 2 /SDB and KH570-SiO 2 /GMA/SDB with Ni 2+ are according to pseudo-first-order kinetic. The adsorption of SDB and KH570-SiO 2 /GMA/SDB obeyed Freundlich isotherm, while the adsorption of KH570-SiO 2 /SDB obeyed Langmuir isotherm.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2013
·
IF 3.473
Zhimin Zhu,Fengqiang Sun,Liting Yang,Kaiyuan Gu,Weishan Li
Photo-initiated dispersion polymerization, a photochemical method for preparing poly (styrene-co-maleic anhydride) microspheres, is introduced for the first time in this paper. Ultraviolet lamp, ethanol/water mixture, 2,2-azobisisobutyronitrile, and poly (vinylpyrrolidone) were respectively used as the light source, green solvent, initiator, and stabilizer in the preparation. After careful study of the influencing factors, formations, sizes and size distributions of the microspheres were found to systematically vary with light intensity and amount of reagents used. Under the optimal conditions, microspheres with the narrowest size distribution and sizes smaller than 1 μm were obtained. Based on the functional groups contributed by the MAH , an important application of the prepared microspheres in Ni 2+ adsorption was explored. Adsorption capacities were controlled by the MAH amount added in the microsphere preparation.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）