INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Xiujuan Zhao,Yangyang Luo,Peixin Tan,Mingxian Liu,Changren Zhou
A high-performance oil-water separation device that built by environment-friendly materials is a promising strategy to solve water pollution problem. In this study, we developed an oil-water separation system with chitin/halloysite nanotubes (C/HNTs) composites. C/HNTs were crosslinked by epichlorohydrin and freeze-dried, then a porous sponge was formed. The C/HNTs sponge was modified to be hydrophobic via immersing into bromohexadecane ethanol solution. The surface structure, mechanical properties, microstructure, oil absorption and oil-water separation ability of the C/HNTs sponge were investigated. The addition of HNTs significantly increased the compressive strength of chitin sponge without influence on porous structure . IR spectra indicated the successful coating of bromohexadecane on the C/HNTs sponge surface, which enabled the hydrophobicity and lipophilicity of this construct. The inside construct of the C/HNTs sponges were full of interconnected pores, and the pore size ranged from 250 to 500 μm. The absorption capability for various oil and grease were measured, including methylbenzene, sunflower seed oil , carbon dichloride, n-hexane, chloroform and acetone. It is found that the total amount of chloroform absorbed by a C/HNTs sponge was ~11.23 times of the sponge's weight, and the absorption for hexane was ~3.94 times of the sponge's weight. The sponge also exhibited an excellent oil-water separation ability with as high as 98.7% separation efficiency. All the results suggested that the chitin/HNTs sponges with improved mechanical property would have a great potential in oil-water separation.
研究领域:
材料科学
·
环境工程
·
高分子化学
·
纳米复合材料
·
分离技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Hao-Cheng Yang,Jun-Ke Pi,Kun-Jian Liao,He Huang,Qing-Yun Wu,Xiao-Jun Huang,Zhi-Kang Xu
Silica-decorated polypropylene microfiltration membranes were fabricated via a facile biomimetic silicification process on the polydopamine/polyethylenimine-modified surfaces. The membranes exhibit superhydrophilicity and underwater superoleophobicity derived from the inherent hydrophilicity and the well-defined micronanocomposite structures of the silica-decorated surfaces. They can be applied in varieties of oil-in-water emulsions separation with high permeate flux (above 1200 L/m2h under 0.04 MPa) and oil rejection (above 99%). The membranes also have relatively high oil breakthrough pressure reaching 0.16 MPa due to the microporous structure, showing great potential for practical applications. Furthermore, such mussel-inspired intermediate layer provides us a convenient and powerful tool to fabricate organic–inorganic hybrid membranes for advanced applications.
研究领域:
膜科学
·
环境工程
·
材料科学
·
分离技术
·
仿生材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 19
·11381-11388
·
IF 3.108
Xiang Li,Binglun Chen,Weibin Cai,Tao Wang,Zhen Wu,Jiding Li
There is a lack of stable and hydrophobic organic solvent nanofiltration (OSN) membranes meaning that their implementation in non-polar solvent nanofiltration remains a challenge, typically in solvent (e.g. hexane) recovery during vegetable oil production (e.g. soybean oil/hexane). Considering this, novel trifluoropropylmethylsiloxane dimethylsiloxane (PDMS–PTFPMS)/polyvinylidene fluoride (PVDF) membranes, with both high hexane permeability of PDMS and excellent hexane stability of PTFPMS, were successfully developed to recover hexane via OSN. Their microstructure and surface properties were characterized by SEM, FTIR, DSC, TGA, XPS and contact angle measurements. We explored the effects of the ratio of the PTFPMS segment in polymer chain and polymer viscosity on membrane performance. With regards to the F50-M membrane, we also conducted a comprehensive study on the OSN performance of the F50-M membrane under different operational conditions. The oil rejection was above 95% with stable hexane permeability of 3.06 kg−1 μm m−2 h−1 bar−1 over a 32-day period. Experimental results confirmed its ability to recover hexane under various operational conditions, showing high oil rejection and excellent long-term operational stability. We attributed its outstanding performance to its unique microstructure and surface properties due to the fluorine-containing PTFPMS segment. This study indicates that fluoropolymer membranes are promising candidates in OSN processes, offering a wider choice of membrane materials and application fields.
研究领域:
膜科学
·
化学工程
·
分离技术
·
高分子材料
·
可持续加工
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 2
·1194-1202
·
IF 2.302
Wu Jindan,Wei Wei,Zhao Sufang,Sun Mengyuan,Wang Jiping
Since oil-removing materials are prone to be fouled by viscous oils, causing the loss of their separation performance, water-removing textile-based materials were developed for oil/water separation with high water flux, easy-cleaning ability, and long-term efficiency in this study. Three types of highly hydrophilic and underwater oleophobic fabrics with different pore morphologies and sizes were obtained by poly(vinyl alcohol) (PVA) crosslinking. Due to the special wettability, highly porous structure, and good softness, the PVA-modified textiles served as a great filtration material for oil/water mixtures and the separation efficiency achieved above 99 %. The low-fouling performance ensured the textiles being easily cleaned and keeping high separation efficiency after using for 10 times. Factors affecting the oil/water separation performance were studied, and it was found that the separation efficiency was essentially determined by surface underwater oleophobicity and mean pore size. This study provided a fundamental understanding of the design and fabrication principle of oil/water separation materials.
研究领域:
材料科学
·
环境工程
·
表面化学
·
分离技术
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Yingchun Wang,Yanrong Lan,Xiaomeng Shi,Yongze Sheng,Yutong Yang,Shan Peng,Jianzhong Xu
In this paper, a layer-by-layer method was used to firstly prepare self-extinguished flame-retardant and multifunctional superwetting coatings, which were consisted of alternative charge adsorption of branched poly (ethylenimine) (BPEI), phytic acid (PA), and ammonium polyphosphate (APP) with only three bilayers. When the polyethylene terephthalate (PET) fabric was assembled with the coating, it obtained superior self-extinguished flame retardance after ignition for 5 s. The mesh deposited with the coatings showed instant superhydrophilicity and superior underwater superoleophobicity in various water/corrosive environments only if the top layer was PA. The coated mesh presented extremely stable and highly efficient oil-water separation capability with efficiency larger than 99%, which could quickly separate a series of immiscible mixtures of oil and water (also include corrosive liquids of strong acid/alkali/aqua regia, hot water , etc). Moreover, owing to its in-air superhydrophilicity and underwater superoleophobicity, and instant underoil superhydrophilicity, the coated mesh also could simultaneously efficiently separate various oil-in-water and water-in-oil emulsions. In addition, the coatings showed high absorption capabilities for various heavy metal ions due to the strong chelation ability of PA and BPEI molecules, which efficiently and successfully removed heavy metal ions from water.
研究领域:
材料科学
·
防火工程
·
表面化学
·
环境修复
·
分离技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）