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Huiyuan Guan,Jundong Wang,Siyuan Tan,Qiang Han,Qionglin Liang,Mingyu Ding 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.6
A novel and uncomplicated synthesis method of Cu2+-chelating with carboxyl groups that directly-modified NiFe2O4 magnetic microspheres (NiFe2O4-PAA-Cu2+) was fabricated for selective enrichment and separation of bovine hemoglobin (BHb). First, a carboxyl group directly-modified on NiFe2O4 magnetic microspheres was gained through a facile one-pot solvothermal method. Second, Cu2+ from CuSO4 was brought into use to react with carboxyl groups under mechanical stirring at room temperature. The resulting magnetic microspheres were characterized by distinct instruments that included transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM) and scanning electron microscope (SEM) to examine the size, morphology, composition and magnetization characterization. The results indicated that the NiFe2O4-PAA-Cu2+ microspheres exhibited good saturation magnetization (36.686 emu g1), which can facilitate magnetic separation under the help of an outside magnetic field. Also, good dispersion and high adsorption ability to BHb (783.53mg g1) can be applied to selective enrichment for bovine hemoglobin and used for selective sorption of BHb protein in bovine blood samples.
Xia Lv,Xueqin Li,Lu Huang,Siyuan Ding,Yin Lv,Jinli Zhang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.3
Pebax® MH 1657 (Pebax)-based blend membranes with different polyether-amine (PEA) loadings were designed and fabricated for efficient CO2 separation. The CO2 separation performance of Pebax/PEA blend membranes was greatly improved in comparison with that of pure membranes. This was mainly because the introduced PEA tailored the physical and chemical microenvironments in blend membranes. Specifically, PEA was a liquid-like additive, which was beneficial to reduce the mass transfer resistance of gases and increase CO2 permeability. Meanwhile, PEA contained amino groups that acted as mobile carriers to tailor the chemical microenvironment in blend membranes. The mobile carriers preferentially reacted reversibly with CO2 molecules, facilitating CO2 transport in membranes. Compared with CO2/CH4 separation performance of pure Pebax membrane, CO2 permeability and CO2/CH4 separation factor of Pebax/PEA-3 increased by 144.8% and 29.4%, respectively. This study suggests that PEA is a promising membrane material for tailoring the physical and chemical microenvironments in blend membranes for efficient CO2 separation.