JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Mengqi Shi,Wentao Yan,Yong Zhou,Zhi Wang,Lifen Liu,Song Zhao,Yanli Ji,Jixiao Wang,Congjie Gao,Peng Zhang,Xingzhong Cao
In this work, a support modified by tannic acid (TA) and a green co-solvent (dimethyl carbonate (DMC)) were used jointly to prepare high performance polyamide (PA) reverse osmosis (RO) membranes. The membrane characterization results showed that (1) the leaf-like structure became more pronounced on the membrane surface owing to the addition of DMC and (2) TA made the PA active layer thinner and denser. Because of these improvements of skin layer structure, the RO membranes prepared using TA and DMC (i.e., polysulfone (PSf)/TA-RO@DMC) had a better performance than the membranes prepared without using TA and DMC (i.e., PSf-RO) and those prepared using only TA (i.e., PSf/TA-RO) or only DMC (i.e., PSf-RO@DMC). By joining hands, TA and DMC endowed the RO membranes with a high flux of 64.2 ± 1.8 L m −1 h −2 and a high salt rejection of 99.03 ± 0.02% (the testing condition: 15.5 bar pressure, 2000 ppm NaCl feed and 25 °C). Besides, chlorination was used to improve the membrane performance further. The chlorination results showed that chlorinated PSf/TA-RO@DMC had a higher performance than chlorinated PSf-RO@DMC. This is because TA increased the compactness of PA active layer, which weakened the effect of chlorine attack on PA. After chlorination, the flux and salt rejection of PSf/TA-RO@DMC can be improved further to 90.5 ± 6.3 L m −1 h −2 and 99.25 ± 0.02%, respectively (the testing condition: 15.5 bar pressure, 2000 ppm NaCl feed and 25 °C).
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
Frontiers of Materials Science
·
2024
·Vol. 18
·期 4
·1-11
·
IF 2.5
Yue Li-ping,Kong Fan-xin,Chen Jin-fu,Zhou Ai-guo,Sun Guang-dong
Ionized amine group (R-NH 2 ) and carboxyl group (R-COOH) within the active layer of polyamide (PA) nanofiltration membranes result in the formation of positive (R-NH
+ 3
) and negative (R-COO − ) functional groups, respectively, which determines membrane performance and is essential for membrane fabrication and modification. Herein, a facile dye adsorption/desorption method using Orange II and Toluidine Blue O dyes was developed to measure the densities of R-NH 2 , R-NH
+ 3
, R-COOH, or R-COO − on surfaces of six PA membranes, and the correlation between the density of such groups and the zeta potential was established. The dye adsorption method was proven reliable due to its lower standard deviation, detection limit, and quantification limit values. Furthermore, the densities of R-NH
+ 3
or R-COO − under different pH values were measured, fitting well with results calculated from the acid-base equilibrium theory. Additionally, a correlation was established between the net surface density ([R-NH
+ 3
] − [R-COO − ]) and the surface charge density ( σ ) calculated via the Gouy–Chapman model based on zeta potential results. The resulted correlation ( σ /(mC·m −2 ) = (3.67 ± 0.08) × ([R-NH
+ 3
] − [R-COO − ])/(nmol·cm −2 ) + (0.295 ± 0.08)) effectively predicts the σ value of the membrane. This study provides a facile and reliable dye adsorption method for measuring the density of R-NH 2 , R-NH
+ 3
, R-COOH, or R-COO − , enabling an in-depth understanding of membrane charge properties.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qiang Li,Tongxin Qu,Shuting Tan,Teng Wang,Yuhang Ding,Chang Wang,Junying Zhang,Zhuo Xiong,Yongchun Zhao
Integrated carbon dioxide (CO 2 ) capture and electrocatalytic reduction processes through dual-function amine-based electrolytes and their integration into a single reactor can lead to significant energy savings, simplified process flow, and reduced transportation risks. This work investigates the structure–activity relationship of dual-functional amine-based electrolytes for CO 2 capture and electrocatalytic reduction and develops an efficient dual-functional amine-based electrolyte system. We investigated 10 different amine-based solutions for their CO 2 capture and reduction performances. The substituents on the nitrogen atom of the intermediate carbamate and the positions of the hydroxyl and branched groups affect the capture and electrochemical reduction. The 1,3-propanediamine system demonstrated enhanced CO 2 solubility uptake (58.1 %), Faradaic efficiency (10.6 %), and current density (52.1 %) compared with the monoethanolamine system, indicating its potential as a dual-function amine-based electrolyte. Furthermore, density functional theory calculations indicated that the charge distribution of carbamate and the dissociation of C–N bonds directly influence the adsorption of carbamates on the electrode surface and the Faradaic efficiency of the reduced products. In addition, reaction path analysis based on the zwitterionic mechanism indicated that intermediates (carbamate R 1 R 2 NCOO - ) with higher electronegativity are more conducive to adsorb onto the electrode surface and inhibit hydrogen generation from protonated amines (R 1 R 2 NHH + ). The results suggest that the selection or design of dual-functional amine-based electrolytes should prioritize amines with straight alkanol chains rather than branched ones, which do not form intramolecular hydrogen bonds or heterocyclic structures. This work provides directions and guidance for designing and developing dual-functional electrolytes for integrated carbon capture and electrocatalytic conversion technologies.
研究领域:
环境科学
·
电化学
·
材料科学
✓ 已验证
DOI
高影响因子
Nuclear Science and Techniques
·
2023
·Vol. 34
·期 6
·1-12
·
IF 2.8
Ren Wan-Ning,Feng Xin-Xin,He Yu-Long,Wang Ming-Lei,Hong Wan-Feng,Han Hong-Wei,Hu Jiang-Tao,Wu Guo-Zhong
Direct collection of uranium from low uranium systems via adsorption remains challenging. Fibrous sorbent materials with amidoxime (AO) groups are promising adsorbents for uranium extraction from seawater. However, low AO adsorption group utilization remains an issue. We herein fabricated a branched structure containing AO groups on polypropylene/polyethylene spun-laced nonwoven (PP/PE SNW) fibers using grafting polymerization induced by radiation (RIGP) to improve AO utilization. The chemical structures, thermal properties, and surface morphologies of the raw and treated PP/PE SNW fibers were studied. The results show that an adsorptive functional layer with a branching structure was successfully anchored to the fiber surface. The adsorption properties were investigated using batch adsorption experiments in simulated seawater with an initial uranium concentration of 500 μg·L −1 (pH 4, 25 °C). The maximum adsorption capacity of the adsorbent material was 137.3 mg·g −1 within 24 h; moreover, the uranyl removal reached 96% within 240 min. The adsorbent had an AO utilization rate of 1/3.5 and was stable over a pH range of 4–10, with good selectivity and reusability, demonstrating its potential for seawater uranium extraction.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 18
·6848-6855
·
IF 3.069
Xiaoting Huang,Haiyang Liu,Jiewen Zhang,Boren Xiao,Fengxu Wu,Yueying Zhang,Ying Tan,Yuyang Jiang
A dicyanoisophorone-based near-infrared fluorescent probe (NIR-NP) was successfully designed for hydrogen sulfide (H2S) detection. 7-Nitro-1,2,3-benzoxadiazole (NBD) amine, an electron-withdrawing group, was applied to quench the fluorescence of dicyanoisophorone-based fluorescent dyes and could be removed by H2S-specific thiolysis of an NBD amine bond, leading to a significant fluorescence turn-on response. The probe could quantitatively detect H2S with a lower detection limit (0.03 μM) in vitro and in living cells. The probe with a large Stokes shift (186 nm) showed a high selectivity to H2S in the presence of other biothiols, including glutathione, homocysteine, and cysteine. Moreover, the probe was successfully applied to image endogenous H2S in different tumor cells and in liver tissues. The excellent properties of the probe and its applications in cell and tissue imaging indicated its potential for further exploration and application of H2S in the pathophysiology of cancers and even in the diagnosis of H2S-related diseases.
研究领域:
分子影像学
·
肿瘤学
·
化学生物学
·
分子生物学
·
生物分析化学
·
转化医学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2010
·
IF 3.203
Xingwei Yu,Zhi Wang,Zhihong Wei,Shuangjie Yuan,Juan Zhao,Jixiao Wang,Shichang Wang
A novel tertiary amine group containing fixed carrier thin film composite (TFC) membrane was developed by the interfacial polymerization of 3,3′-Diamino-N-methyldipropylamine (DNMDAm) and trimesoyl chloride (TMC) on the polysulfone (PS) support membrane. ATR-FTIR, XPS , AFM and SEM were employed to characterize the active surface of the composite membrane . The gas transport property of the DNMDAm-TMC/PS membrane was investigated by studying the permselectivity varying with feed gas pressure and the possible reactions between gases and the membrane. Furthermore, the effects of two important factors (the DNMDAm concentration and the TMC concentration) on membrane morphology and performance were investigated. It was found that both the DNMDAm concentration and the TMC concentration play important roles in determining the membrane morphology and performance, which may reconcile some contradictory findings in some references. Moreover, the DNMDAm-TMC/PS composite membrane showed both good CO 2 /N 2 and CO 2 /CH 4 separation performance. For CO 2 /N 2 gas mixture (20/80 by volume), the membrane prepared with 0.0062 mol/l of DNMDAm and 0.0226 mol/l of TMC displayed a CO 2 permeance of 173 GPU and CO 2 /N 2 selectivity of 70 at 0.11 MPa feed pressure. For CO 2 /CH 4 gas mixture (10/90 by volume), the same membrane showed a CO 2 permeance of 118 GPU and CO 2 /CH 4 selectivity of 37 at 0.11 MPa feed pressure. The high CO 2 /N 2 and CO 2 /CH 4 separation performance of DNMDAm-TMC/PS composite membrane was mainly attributed to the thin film thickness and the properties of tertiary amino groups.
研究领域:
材料科学
·
膜分离技术
·
化学工程
·
环境科学
·
气体传输
✓ 已验证
DOI
高影响因子
Advanced Materials Technologies
·
2019
·Vol. 5
·期 1
·1900781
·
IF 5.395
Jingjing Zhao,Yulin Fu,Yuxiang Xiao,Ying Dong,Xiaohao Wang,Liwei Lin
Smart textiles, which integrate different electronic devices in yarns, fabrics, or garments, have the ability to perceive and respond to environmental stimuli. With the features of mechanical flexibility, knittable integration, and wearable comfort, smart textiles have great potential in wearable electronics. Here, a naturally integrated force sensing textile based on knittable composite coaxial fibers is proposed. A flexible commercial nylon fiber works as a substrate, an evaporated Au layer serves as an inner electrode, and carbon nanotubes and polyaniline act as piezoresistive sensing materials in the coaxial fibers. The assembled sensor retains both high detection performance and outstanding integration properties. A high detection limit, fast response, reversible recovery, mechanical stability, and good repeatability are realized in this sensor. Subsequently, the potential of using a coaxial fiber to achieve naturally knitted structures by an embroidery method is explored. A sensing array can be integrated into designed patterns and can achieve multiple site force measurements. Furthermore, with the flexibility and porosity of textiles, these smart textiles provide breathability in wearable applications, which is valuable in long-term detection. It is anticipated that the naturally knitted smart textile will be practical in wearable healthcare and long-term force perception.
研究领域:
生物医学工程
·
柔性电子
·
可穿戴传感器
·
功能纺织材料
·
健康监测
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Peng Fan,Shuonan Wang,Hao Liu,Libing Liao,Guocheng Lv,Lefu Mei
Design and preparation of nanostructured conducting polymers (CPs) is a very important research direction for high performance CPs-based supercapacitors (SCs). With hollow structure, high surface area, tunable surface properties and abundant resources, natural halloysite is a promising template agent for preparing new nanotubular-structure CPs. Here, nanotubular-structure polyaniline was successfully synthesized using natural tubular halloysite as hard template. The obtained tubular polyaniline presents high specific capacitance at various current density as electrode material for supercapacitors. After a facile carbon coating, the carbon coated tubular polyaniline shows high specific capacitance of 654 F g −1 at the current density of 1 A g −1 and excellent electrochemical stability with capacitance retentions ∼87% after 10000 cycles. This work may prove the feasibility of preparing high performance CPs-based nanostructure electrode materials for SCs application based on inexpensive natural clay minerals.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能源存储
·
高分子化学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Jifei Cui,John F. Kennedy,Jun Nie,Guiping Ma
Amines monomers, N , N -dimethylaminoethyl methacrylate (DMAEMA), N , N -dimethylethanolamine (DMEA), 2-dimethylaminoethylamine (DMEDA) and N -methiyldiethanolamine (MDEA) were used to induce the formation of calcium carbonate (CaCO 3 ) crystals on chitosan films, by using (NH4) 2 CO 3 diffusion method at ambient temperature. The obtained CaCO 3 particles were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and Energy dispersive spectroscopy (EDS). The influence of reaction variables, such as the additive concentration and their types were also investigated on the products. The morphologies of CaCO 3 crystals, inter-grown in cube-shape, were controlled by DMAEMA and DMEA. It was observed that the morphologies of CaCO 3 changed from the cube grown arms to massive calcite with a hole on the face by increasing the concentrations of DMEDA and MDEA. While the precipitation grew on chitosan film without any organic additive, only single cube-shaped crystals were obtained. By these results the possible mechanisms can be proposed that electronic movement of the groups on the monomer effected ions configuration and molecules absorbed on the exposed surface, resulted the change of the surface energy, which caused the change in the morphology of CaCO 3 .
研究领域:
材料科学
·
生物矿化
·
高分子材料
·
无机化学
·
功能薄膜
✓ 已验证
DOI
高影响因子
CURRENT ORGANIC SYNTHESIS
·
2015
·Vol. 12
·期 1
·71-75
·
IF 2.117
Nengquan Li,Kun Chen,Zhaokang Fan,Yiwu Quan,Qingmin Chen
A new family of bipolar hosts TPA-DAF, TPA-(DAF)2 and TPA-(DAF)3 based on triphenylamine and 4,5- diazafluorene moiety were synthesized through Friedel-Crafts reaction, and all of the three prepared hosts showed excellent thermal stability and exhibited blue fluorescence in solution.
研究领域:
有机电子学
·
光电材料
·
高分子化学
·
荧光材料
·
热稳定性研究
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2013
·Vol. 4
·期 7
·2325-2332
·
IF 5.231
Peisheng Zhang,Jian Chen,Fuhua Huang,Zhiqiang Zeng,Jia Hu,Pinggui Yi,Fang Zeng,Shuizhu Wu
Cupric pollution is a global problem, and the development of stable and sensitive fluorescent probes for cupric ions in the water phase has long been sought. In the present study, we report on the fabrication of core–shell nanoparticle-based fluorescent chemosensors for Cu2+ detection in aqueous media. The core–shell nanoparticle sensor was prepared by a facile one-pot miniemulsion polymerization, in which the fluorescent dye (4-methamino-9-allyl-1,8-naphthalimide, MANI) was covalently incorporated into particle core and the Cu2+ ligand i.e. Vinylbenzylcyclam (VBC), chemically linked onto the surface. The cyclam-functionalized fluorescent polymeric nanoparticles exhibit a high affinity for Cu2+ ions in aqueous media. Upon the addition of Cu2+, the fluorescent emission of the MANI dye in nanoparticles can be quenched on the basis of intraparticle fluorescence resonance energy transfer (FRET) from the dye in the hydrophobic PMMA core to the Cu2+–cyclam complexes on the nanoparticle surface, and the nanoparticle sensor can selectively detect the Cu2+ in water with the detection limit of 500 nM. The observed FRET efficiencies (31.6–73.4%), as well as the distance (r) between MANI (donor) and Cu2+–cyclam complexes (acceptor), were also determined. No interference was observed from other metal ions, making it a highly sensitive and selective Cu2+ probe. Moreover, the nanoparticle-based fluorescent sensor was applicable in a relatively wide pH range (pH 4–10) in water and it exhibited excellent long-term photostability for Cu2+ detection (>45 days) in aqueous media; thus, this approach may provide a new strategy for ratiometric detection of analytes in environmental and biological applications.
研究领域:
分析化学
·
环境监测
·
纳米医学
·
生物传感
·
分子探针
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xin Wen,Zhanfang Cao,Jing Wang,Shuai Wang,Hong Zhong
A novel tri-isopropanolamine functionalized graphene oxide (TI-GO) adsorbent was synthesized by one-step reaction at 358K. Then the prepared TI-GO was characterized by SEM-EDS, FTIR, Raman spectra, TG, BET and XPS. The characterization results indicated the TI-GO has been synthesized successfully and it interact with Pb(II) ions through its nitrogen and oxygen-containing functional groups. Batch adsorption experiments were applied to evaluate the optimized conditions of adsorption. The results indicated that the TI-GO can reach equilibrium adsorption in 30 min and get maximum adsorption capacity at 293 K, pH 5.0. Besides, the adsorption kinetic and adsorption isotherm research indicated that the adsorption of TI-GO fit pseudo-second-order (PSO) kinetic and Langmuir adsorption isotherm model. In addition, the maximum adsorption capacity evaluated by Langmuir adsorption isotherm equation is 1478 mg/g.
研究领域:
环境科学
·
材料科学
·
化学工程
·
环境污染治理
·
吸附材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）