Fabrication of hydrophobic and oleophilic polyurethane foam sponge modified with hydrophobic Al2O3 for oil/water separation

Liying Kong,Yang Li,Fengxian Qiu,Tao Zhang,Qing Guo,Xiaoying Zhang,Dongya Yang,Jicheng Xu,Mengwei Xue 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.58 No.-

In current work, hydrophobic and oleophilic polyurethane (Al2O3/PUF) foam sponge was prepared by foaming technology. The material was characterized by XRD, TEM, BET, SEM and water contact angles (CA). The Al2O3/PUF was applied to removal of oil or organic solvent from oil/water system. Water contact angle of Al2O3/PUF could exceed 140°. The absorption capacity of Al2O3/PUF could be obtained 37 g/g and found to be reusable up to 10 cycles while maintaining its high absorption capacity. The result indicated that prepared foam sponge has good potential application in oil–water separation.

In situ fabrication dynamic carbon fabrics membrane with tunable wettability for selective oil–water separation

Xuejie Yue,Tao Zhang,Dongya Yang,Fengxian Qiu,Yao zhu,Jiasheng Fang 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-

Achieving reversible wetting properties of separation membrane for on-demand separate oil/water mixture remains challenging, especially for the oil/water mixtures with complex impurities. Herein, hierarchical porous dynamic separation membranes involving primary fiber membrane and secondary nanostructures are fabricated by in situ growth ZnO nanowires on the surface of carbon fibers. Based on the effect of oxygen-related defects of ZnO nanowires coating, the as-fabricated dynamic separation membrane is capable of switching wetting property between high-hydrophobicity and superhydrophilicity via simply annealing alternatively under vacuum and air environment, achieving the switching between oil-removing mode and water-removing mode according to the type of oil/water mixtures. Moreover, the dynamic separation membrane can be extended to separate the oil/water mixtures containing suspended solids using the reconstruction of ZnO dynamic coating. Through removing the ZnO dynamic coating via soaking the clogged membrane in the hydrochloric acid–ethanol and refabricating the ZnO-dynamic coating, the membrane blocked by impurities could be readily re-formed, which effectively expand its scope of application and enhance its anti-fouling property. This work not only provides a simple and on-demand solution for pure oily wastewater, but also extends the separation membrane to separate oil/water mixtures containing suspended solids.

Asymmetric PET Hybrid Membrane Derived from Waste PET Plastic for Personal Thermal Management Applications

Tao Zhang,Xu He,Bencheng Zhao,Dongya Yang,Fengxian Qiu 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12

Controllable fabrication of wearable polyethylene terephthalate (PET) hybrid membrane derived from waste plastic is essential from the viewpoint of waste utilization and personal thermal management. Herein, this work presents an effective and versatile strategy for the fabrication of the asymmetric hybrid membrane using waste PET plastic bottles as raw material for personal thermal management applications. The obtained ZnO/Ag@PET fibrous nanofibrous membrane (ZnO/Ag@PNM) shows the asymmetrical characteristics of infrared radiation for personal thermal management: the low IR-emissivity (~ 0.39) layer (Ag layer) is facing outside to reduce the human thermal radiation, and high IR-emissivity (~ 0.96) layer (ZnO layer) is facing outward to enhance the human thermal radiation. Notably, the excellent electrical conductivity of metal coating grants the superior Joule heating for extra warmth under a low supplied voltage (2 V). Moreover, the ZnO/Ag@PNM membrane exhibits excellent antibacterial activity, flexibility, and high breathability, which shows great potential and value for wearable material in the personal thermal management application. This work not only presents a promising approach to fabricating the wearable Janus composite membrane using waste PET plastic bottles as starting materials but also provides practical potentials for thermal management and waste utilization.

Hierarchical Porous BiOCl/LDHs Composites Templated from Cotton Fibers for Efficient Removal of Dyes from Aqueous Solution

Tao Zhang,Xinbin Nie,Xuejie Yue,Dongya Yang,Yuting Dai,Fengxian Qiu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.3

Hierarchically structured BiOCl/LDHs composites with well-developed porosity and high surface area have been prepared by an in situ growth of BiOCl on the surfaces LDHs fibers, and their adsorption capacities and photocatalytic activities are investigated by using methylene blue (MB) as model pollutants. The results indicate that the BiOCl/LDHs composites possess high surface area up to 126.2 m2/g. The as-prepared BiOCl/LDHs composites exhibited higher adsorptive ability and improved photocatalytic activity compared to bare BiOCl particles and LDHs fibers based on the removal of MB in aqueous solution, showing that BiOCl/LDHs composites can be used as efficient environmentally friendly materials for dye wastewater treatment.

Preparation and characterization of L-phenylalanine-derivatized β-cyclodextrin-bonded silica and its application on chiral separation of alanine acid racemates

Fengxian Qiu,Kaichen He,Jiao Qin,Jie Yan,Dongya Yang 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.11

A chiral adsorption material, L-phenylalanine-derivatized β-cyclodextrin-bonded silica (L-Phe-CD/SiO2),was prepared and characterized by Fourier transform infrared (FT-IR), elemental analysis, field emission scanning electron microscope (FESEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) measurements. Langmuir and Freundlich isotherm models were employed to simulate the equilibrium data. The results showed that the equilibrium data were well represented by Langmuir isotherm model. Experimental data were analyzed using pseudofirst order and pseudo-second order kinetic models and the obtained results indicated that kinetics followed a pseudosecond order equation. The static adsorption experiments indicated that L-Phe-CD/SiO2 had significantly higher adsorption capacity for L-alanine (L-Ala) compared with D-alanine (D-Ala); and the selectivity coefficient is 2.53. The result shows that the prepared L-Phe-CD/SiO2 could be applied to chiral separation of the racemic alanine acid solution.

Production of biodiesel from soybean oil catalyzed by attapulgite loaded with C4H5O6KNa catalyst

Fengxian Qiu,Bin Ye,Yihuai Li,Chuanjia Sun,Zhenyu Zhao,Teng Ma,Dongya Yang 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.7

Biodiesel is a green, safe, renewable alternative fuel, which is of great significance to solving the problem of energy shortage and environmental pollution. A series of solid base catalysts were prepared with the support of attapulgite (ATP), the load of C4H5O6KNa by impregnation method, and were used to catalyze transesterification of soybean oil with methanol to biodiesel. The activities of prepared catalysts were investigated compared to pure ATP. The optimal conditions for the catalyst preparation were investigated: molar ratio of Na : ATP was 1.7 : 1 and calcination temperature was 400 oC. The prepared catalysts were characterized by several techniques such as Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, N2 adsorption-desorption measurements,X-ray diffraction and the Hammett indicator method. The prepared solid base catalyst can be separated from reaction system effectively and easily. The effects of the molar ratio of methanol to oil, reaction temperature and amount of catalyst on the biodiesel yield were investigated. The experimental results showed that a 22 : 1 molar ratio of methanol to oil, 10.0% of catalyst amount, 65 oC of reaction temperature and 3.0 h of reaction time gave the best results. The catalyst has longer lifetime and maintained sustained activity after being used for five cycles.

Preparation, characterization and scale performance of scale inhibitor copolymer modification with chitosan

Xiaorui Guo,Ke Dong,Xin Zhou,Jing Qi,Yang Zhou,Dongya Yang,Fengxian Qiu 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.6

A scale inhibitor copolymer modification with chitosan was prepared from maleic anhydride, styrene sulfonic sodium, acrylic amide and chitosan. The conditions of preparing scale inhibitor were optimized. The chemical structure and thermal property were investigated. Using the static experiment method, the influences of copolymer concentration, temperature time, Ca2+ concentration, HCO3 concentration of the system on the inhibition efficiency were investigated. The experimental results showed that the polymer was excellent calcium carbonate scale inhibition and the resistance rate of calcium carbonate scale up to 95.62%, and could be used in the system of high temperature and high hardness water.

Polyphyllin I combined with doxorubicin shows chemosensitization effect in vivo and reduces immunotoxicity of doxorubicin

Zhu Xiang,Na Xin,Zeng Yueqin,Xu Yangantai,Chai Dongya,Yang Huanzhi,Miao Jingqian,Zhang Yuan,Yang Fenghua,Wang Yuehu,Zhou Yiping 대한독성 유전단백체 학회 2022 Molecular & cellular toxicology Vol.18 No.3

Background Polyphyllin I (PPI), a steroidal saponin, exhibits antitumor activity and chemosensitization effect for a broad spectrum of cancer cells, however, its toxicity and chemosensitization effect in vivo is still unknown. Objective We investigated PPI’s cytotoxic activity, toxicity and chemosensitization effect and in vitro and in vivo . Results The IC 50 values of PPI on MCF-7, H22, and S180 tumor cells were 4.37 μmol/L, 1.71 μmol/L, and 0.92 μmol/L, respectively. The LD 50 of PPI was found to be 47.9 mg/kg using ip. injection. PPI at concentrations of 0.3 mg/kg, 0.6 mg/ kg, 1.2 mg/kg, and 2.4 mg/kg (1/80 LD 50 –1/20 LD 50 ) were synergized with DOX of 0.5 mg/kg to inhibit the H22 and S180 tumor growth in vivo by inducing apoptosis without obvious immunotoxicity. PPI exhibited a remarkable hemolytic effect on rabbit erythrocytes (EC 50 = 4.3 μM), while it had no impact in mice. Conclusion Our study revealed that the PPI-sensitized chemotherapeutic effect, when used in safe doses, circumvents immunotoxic side effects of DOX in vivo; thus, helping future clinical research.

A facile hydrothermal synthesis, adsorption kinetics and isotherms to Congo Red azo-dye from aqueous solution of NiO/graphene nanosheets adsorbent

Xinshan Rong,Fengxian Qiu,Jiao Qin,Hao Zhao,Jie Yan,Dongya Yang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-

A series of NiO/graphene nanosheets adsorbents (NGNS) were synthesized by a facile hydrothermal method, and characterized by UV–vis, XRD, TG, TEM, HRTEM, Raman, SAED and XPS methods. The NGNS was applied to deal with wastewater solution containing Congo Red (CR); and adsorption efficiency attained 99.56% at optimum condition. The adsorption kinetic and isotherm of adsorbent toward CR were investigated. The results indicated that pseudo second-order kinetic model and the equilibrium data were well fitted by Redlich–Peterson model. The adsorbent can be separated from system effectively and easily. The prepared adsorbent has potential application for the wastewater treatment containing CR azo-dye.

Hierarchical Al2O3/SiO2 fiber membrane with reversible wettability for on-demand oil/water separation

Zhangdi Li,Tianhui Shi,Tao Zhang,Qing Guo,Fengxian Qiu,Xuejie Yue,Dongya Yang 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.1

This work presents an effective method of fabricating hierarchical Al2O3/SiO2 fiber membrane with reversible wettability for on-demand oil/water separation. In this strategy, the superhydrophilic/underwater superoleophobic surfaces are fabricated by in-situ growing hierarchical Al2O3 nanosheets on the SiO2 fiber surfaces that can be used as water-removing materials for oil/water separation. Then, the superhydrophobic/oleophilic surfaces are obtained by surface chemical modification with sodium laurate, which can be used as oil-removing materials for oil/water separation. Interestingly, the reversible wettability transformation of Al2O3/SiO2 fiber membrane can be controlled by the annealing and modification treatment alternately. The as-prepared Al2O3/SiO2 fiber membrane, combining the advantages and overcoming disadvantages of two modes, achieves reversible wettability transitions and on-demand oil/water separation. In addition, the Al2O3/SiO2 fiber membrane shows a significant chemical stability and super-wettability even after five annealing and surface modification cycles, indicating its excellent durability. The separation efficiency in both oil-removing mode and water-removing mode is over 95% for various oil/water mixtures through multiple recycle separation processes. This work not only provides a simple and cost-effective method to fabricate separation membrane with reversible wettability, but also shows great potential in remediation of large-scale oil spillage or organic solvents discharge at different environmental conditions.