INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yongheng Yin,Hongbo Li,Hong Wu,Wei Wang,Zhongyi Jiang
Designing polymer chains which contain building blocks with well-defined dimension is an efficient method to induce microphase separation and regulate the ionic channels of polymer electrolyte membranes (PEMs). In this study, a Wells-Dawson-type polyoxometalate (POM) is synthesized and chemically bonded to a norbornene derivative to prepare poly (POM) blocks. Then the block copolymer poly (POM) 10 - b -poly (COOH) 300 is fabricated using poly (POM) and poly (COOH) blocks. Finally, the block copolymer is blended with sulfonated polysulfone (SPS). The electrostatic interactions between the block copolymer and SPS confer the blend membrane with enhanced mechanical and dimensional stabilities. Due to the homogenous distribution of POM clusters and the hydrophilic-hydrophobic interactions between POMs and polymer backbones , the adjacent hydrophilic domains are connected and continuous proton-transfer channels are induced. As a result, the blend membrane displays proton conductivity of 0.053 S cm −1 (25 °C, 100% RH) and 1.5 × 10 −2 S cm −1 (80 °C, 40% RH), which are 2.52 and 6.25 times higher than those of the plain SPS membrane. Furthermore, SPS/POM-BC-30 shows a maximum power density of 164.9 mW cm −2 , which is 54.7% higher than SPS.
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Bingyan Yu,Keru Hou,Zhuizhui Fan,Kaili Jin,Zaisheng Cai
pH-responsive materials are an important choice for the preparation of smart membranes due to their simplicity of operation, but their substrate requirements are high and most of the existing materials are slow to respond. Cotton fabrics with three-dimensional structures have high strength and resistance to acid and alkali, enabling rapid penetration of acid and alkali solutions with fast response time. In this paper, hexadecyltrimethoxysilane (HDTMS) was used to hydrophobically modify the surface of polydopamine (PDA)-modified CF, and novel CF with pH-adjustable wetting properties were designed by the Michael addition reaction and the Schiff base reaction among 12-aminodododecanedioic acid (NH 2 (CH 2 ) 11 COOH) and PDA. In neutral and acidic aqueous solutions (pH ≤ 7), the coated cotton fabric showed hydrophobicity and lipophilicity, with a separation efficiency of 97.3 % and a separation flux of 3.8 × 10 4 L·m −2 ·h −1 . On the contrary, in alkaline aqueous solutions (pH > 7), the coated cotton fabric had a fast conversion time (within 20s), exhibited oleophobicity and hydrophilicity, with a separation efficiency of 99.9 % and a separation flux of 2.8 × 10 4 L·m −2 ·h −1 . In addition, the cycling and durability tests showed that the cotton fabric had excellent cyclability and durability. This simple, green, intelligent wetting material can be ideal for controllable on-demand oil-water separation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Huiwen Ren,Ruiqi Xie,Sheng Jian,Xiong Tong,Xian Xie,Zhihui Zhao,Xuelin Wei
The separation of spodumene and albite by the new collector 12-aminododecanoic acid (12-ADA) without an activator or depressant was investigated by single-mineral and artificially mixed-ore flotation test. The results showed that under the 12-ADA concentration of 314 mg/L, pH 5.0, and 10 °C, the recoveries of spodumene and albite were 12.85 % and 89.15 %, respectively. At the 12-ADA concentration of 114 mg/L, pH 4.5, and 10 ± 2 °C, Li 2 O grade of 4.56 % and recovery of 84.55 % were achieved. In addition, the interaction mechanism between minerals and 12-ADA was investigated. The results showed that 12-ADA could form an association complex, which could create hydrogen bonds with the Si-O bond on the albite surface through NH 2 , and form chemical bonds with Na through COOH. However, 12-ADA mainly adsorbed onto the spodumene surface through electrostatic attraction. With an increase in the concentration of 12-ADA, albite could preferentially adsorb 12-ADA as a monolayer, while the adsorption between spodumene and 12-ADA was small, when 12-ADA exceeded a certain amount, it became prone to multilayer adsorption. 12-ADA overcame the temperature limitation of traditional fatty acid reagents and had potential application value for the flotation of spodumene in cold areas. It also provided a theoretical basis for the research and development of low-temperature reagents for spodumene.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jie Wang,Bingyan Yu,Keru Hou,Yating Ji,Xiaoyan Li,Chengcheng Li,Chengjian Yao,Zaisheng Cai
Membrane separation technology is widely used in separating oily wastewater, where pH-responsive membranes can cope with different conditions of oil-water separation. However, it is limited by membrane contamination during application. A multifunctional oil-water separation membrane (HATP@CN) with photocatalytic performance and pH response was prepared. The wettability of the membrane can be switched by adjusting the pH quickly, which has hydrophobicity when pH ≤ 7 and hydrophilicity when pH ＞7, and it has stable pH responsiveness. The separation effect of membrane on different kinds of oil-water mixtures under different response conditions was explored. The results showed that the separation efficiency of HATP@CN on heavy oil/water mixture and light oil/water mixture was higher than 96.3 % and 99.2 %, respectively, and the separation flux was higher than 6800 L·m −2 ·h −1 and 10000 L·m −2 ·h −1 , respectively. After 50 cycles of separation, HATP@CN still had good separation effects. At the same time, it can also separate water-in-oil emulsion and oil-in-water emulsion. The loading of TiO 2 endows the membrane with excellent photocatalytic performance, which has a high degradation ability of over 90 % within 6 min for various dye solutions. Even in dynamic filtration and separation, MB can be rapidly degraded to realize water purification. This study provided an effective strategy for applying membranes in complex oil-water separation.
✓ 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）