SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Fan Hu,Chuanjie Fang,Zhanghui Wang,Cuijing Liu,Baoku Zhu,Liping Zhu
In this paper we demonstrate the fabrication and properties of a novel poly (N-vinyl imidazole) (PVI) gel composite porous membrane (GCM) used for rapid separation of dyes through permeating adsorption. The GCMs were fabricated by in situ crosslinking of PVI precursor on microporous support membranes with the aid of ammonium persulfate (APS). The characterizations of membrane morphology and surface chemistry showed the PVI gel was introduced not only onto membrane surface but also inside membrane pores. The obtained GCMs could nearly completely remove various anionic dyes from water with a high flux ranging from 40 to 120 L/m 2 h under a pressure of 8 cm water column. In an optimized case, the treating capacity of the composite membranes towards sunset yellow (SY) maintains about 79 mg/g with a high flux of 500 L/m 2 h under 0.2 bar. The permeation rates reported here is much higher than that of the conventional nanofiltration process for dye separation (about 10 L/m 2 h·bar). What's more, GCMs can also be used to deploy the separation of dye mixture effectively. It was found that the protonation of PVI in acidic environment is responsible for the rapid adsorption of anionic dyes by electrostatic attraction. GCMs are easily regenerated by a basic solution and the high separation performance can be kept well over at least five adsorption-regeneration cycles.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Pei Qiu,Jinyan Xiong,Mengjie Lu,Lijun Liu,Wei Li,Zhipan Wen,Weijie Li,Rong Chen,Gang Cheng
Solar-driven photocatalytic H 2 evolution could tackle the issue of fossil fuels-triggered greenhouse gas emission with sustainable clean energy. However, splitting water into hydrogen with high performance by a single semiconductor is challenging because of the poor charge separation efficiency. Herein, a novel ternary Cu@TiO 2 -Cu 2 O hybrid photocatalyst with multiple charge transfer channels has been designed for efficient solar-to-hydrogen evolution. Indeed, the ternary Cu@TiO 2 -Cu 2 O hybrid by coupling Cu@TiO 2 with Cu 2 O nanoparticles shows highly-efficient photocatalytic hydrogen generation with rate of 12000.6 μmol·g −1 ·h −1 , which is 4.4, 2.1, and 1.9 times higher than the pure TiO 2 (2728.8 μmol·g −1 ·h −1 ), binary Cu@TiO 2 (5595.5 μmol·g −1 ·h −1 ), and TiO 2 -Cu 2 O (6076.8 μmol·g −1 ·h −1 ) composite, respectively. In such a Cu@TiO 2 -Cu 2 O hybrid, the formed internal electric field in the TiO 2 -Cu 2 O p-n junction allows the electrons in Cu 2 O to migrate to TiO 2 , while the electrons in the CB of TiO 2 could flow into Cu via the Schottky junction at the Cu@TiO 2 interface. In this regard, a multiple charge transfer is achieved between the Cu@TiO 2 and Cu 2 O, which facilitates promoted charge separation and results in the construction of electron-accumulated center (Cu) and hole-enriched surface (Cu 2 O). This p-n/Schottky junctions with steered charge transfer assists the hydrogen production upon the Cu@TiO 2 -Cu 2 O ternary photocatalyst.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2017
·
IF 2.536
Yuan Guo,Xiaoqing Zeng,Haiyan Yuan,Yunmei Huang,Yanmei Zhao,Huan Wu,Jidong Yang
In this study, a novel method for chiral recognition of phenylglycinol (PG) enantiomers was proposed. Firstly, water-soluble N -acetyl- l -cysteine (NALC)-capped CdTe quantum dots (QDs) were synthesized and experiment showed that the fluorescence intensity of the reaction system slightly enhancement when added PG enantiomers to NALC-capped CdTe quantum dots (QDs), but the R-PG and S-PG could not be distinguished. Secondly, when there was Ag + presence in the reaction system, the experiment result was extremely interesting, the PG enantiomers cloud make NALC-capped CdTe QDs produce different fluorescence signal, in which the fluorescence of S-PG + Ag + + NALC-CdTe system was significantly enhanced, and the fluorescence of R-PG + Ag + + NALC-CdTe system was markedly decreased. Thirdly, all the enhanced and decreased of the fluorescence intensity were directly proportional to the concentration of R-PG and S-PG in the linearly range 10 − 5 –10 − 7 mol·L − 1 , respectively. So, the new method for simultaneous determination of the PG enantiomers was built too. The experiment result of the method was satisfactory with the detection limit of PG can reached 10 − 7 mol·L − 1 and the related coefficient of S-PG and R-PG are 0.995 and 0.980, respectively. The method was highly sensitive, selective and had wider detection range compared with other methods.
研究领域:
分析化学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Lingling Wang,Hui Huang,Songhua Xiao,Daoping Cai,Yuan Liu,Bin Liu,Dandan Wang,Chenxia Wang,Han Li,Yanrong Wang,Qiuhong Li,Taihong Wang
We report a room-temperature NH3 gas sensor with high response and great long-term stability, including CeO2 NPs conformally coated by cross-linked PANI hydrogel. Such core–shell nanocomposites were prepared by in situ polymerization with different weight ratios of CeO2 NPs and aniline. At room temperature, the nanohybrids showed enhanced response (6.5 to 50 ppm of NH3), which could be attributed to p–n junctions formed by the intimate contact between these two materials. Moreover, the stability was discussed in terms of phytic acid working as a gelator, which helped the PANI sheath accommodate itself and enhance the mechanical strength and chemical stability of the sensors by avoiding “swelling effect” in high relative humidity. The sensors maintained its sensing characteristic (response of ca. 6.5 to 50 ppm of NH3) in 15 days. Herein, the obtained results could help to accelerate the development of ammonia gas sensor.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Zailin Gong,Shujin Li,Weifang Han,Jiaping Wang,Jun Ma,Xiangdong Zhang
The graphene oxide (GO) was synthesized with Brodie's method and grafted with poly ( N -isopropylacrylamide) (NIPAM) in aqueous solution at ambient temperature. Compared with the initial GO, the PNIPAM graft GO (GO-PNIPAM) has larger surface area, pore volume and self-flocculation effect with rapid response to temperature. Moreover, the GO-PNIPAM also has selective adsorptions with different phenol pollutants because of the different interactions of hydrogen bonds and the molecule structure of the adsorbates. Compared with phenol and bisphenol A, hydroquinone has better adsorption on GO-PNIPAM because of the ample phenolic hydroxyl group and the appropriate molecule structure. The adsorption performance of hydroquinone on GO-PNIPAM is also temperature sensitive because of the thermoresponsive transition of the hydrogen bond. The thermoresponsive adsorption and self-flocculation will make the GO-PNIPAM recyclable in the potential water remediation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Yingmin Yu,Fangyu Zhang,Xiaocheng Zhang
The liquid–liquid equilibrium (LLE) data for the ternary systems of {n-octanol + ethylene glycol + solvents (water/n-heptane/n-hexane/1-hexene/1-chlorobutane)} at 298.2 K under 101.3 kPa were determined. The solute distribution constant and selectivity were used to analyze the solvent’s extraction ability. Meanwhile, the NRTL and UNIQUAC models were applied to correlate the experimental LLE data, and the binary interaction parameters were obtained. The root mean square deviation (RMSD) between the experimental data measured and the calculated by the NRTL and UNIQUAC models was less than 3%. The binary interaction parameters have been confirmed by GUI-MATLAB.
研究领域:
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 6
·1-13
·
IF 2.8
Li Zezhong,Xu Jing,Ma Yongqiang,Ma Yue,Liu Zhenlu
Photocatalytic hydrogen production is one of the effective ways of global energy conservation and emission reduction. Herein, we report the successful embedding of flower ball MoS 2 into Sm 2 WO 6 using the hydrothermal method, and p-n heterojunction is obtained successfully. Due to the narrow band gap of MoS 2 , the Sm 2 WO 6 / MoS 2 composite photocatalyst effectively improves the photogenerated carrier separation. The better redox capacity of Sm 2 WO 6 itself also promotes the reduction capacity of Sm 2 WO 6 /MoS 2 . The petals on MoS 2 are closely bound to Sm 2 WO 6 , which enhances the electron transport efficiency and is one of the main factors for improving photocatalytic hydrogen evolution (HER). To explore the performance of Sm 2 WO 6 / MoS 2 by various means of representation. And the HER performance of Sm 2 WO 6 / MoS 2 is evaluated using eosin Y (EY) as sensitizer and TEOA as sacrifice agent. Compared with pure Sm 2 WO 6 , Sm 2 WO 6 / MoS 2 has improved HER performance, and its optimal activity is 142.7 µmol, which is nearly 140 times that of pure Sm 2 WO 6 . This study demonstrates a novel morphology design strategy for composite photocatalysts to promote efficient photocatalytic hydrogen production.
研究领域:
材料科学
·
催化
·
能量转换
·
纳米技术
✓ 已验证
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 11
·797
·
IF 3.8
Hanyang Zhang,Wen Liu,Jiale Hu,Qian Zhang,Zeguo Fang,Dong Li
An efficient method involving copper-catalyzed trifluoromethylthiolation and radical cyclization ofN-phenylpent-4-enamides using readily available and stable AgSCF3as the trifluoromethylthiolating reagent is described. The method enables the synthesis of a series of potential medicinally valuable trifluoromethylthio-substitutedγ-lactams and relative 2-oxazolidinone derivatives with broad functional group compatibility. Mechanistic investigations indicated that this reaction involved amidyl radical-initiated cascade5-exo-trigcyclization followed by trifluoromethylthiolation, resulting in the formation of new C-N and C-S bonds.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2015
·
IF 2.046
Wei-Guo Jia,Dan-Dan Li,Cuiping Gu,Yuan-Chen Dai,Ying-Hua Zhou,Guozan Yuan,En-Hong Sheng
Binuclear [{(DMOX)CdCl} 2 ( μ -Cl) 2 ] (DMOX = 4,5-dihydro-2-(4,5-dihydro-4,4-dimethyloxazol-2-yl)-4,4-dimethyl-oxazole) ( 1 ) and mononuclear [(Dm-Pybox)CdCl 2 ] (Dm-Pybox = 2,6-bis[4′,4′-dimethyloxazolin-2′-yl]pyridine) ( 2 ) were obtained by reacting CdCl 2 with DMOX and Dm-Pybox ligands, respectively. In the solid state, the supramolecular structures of 1 and 2 feature helical chains fabricated by C–H⋯Cl hydrogen bond interactions. The C–N cross-coupling reactions catalyzed by the two complexes were also investigated in homogeneous system. The results show that binuclear complex 1 exhibit significantly enhanced catalytic activity for C–N cross-coupling reactions.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 17
·25952-25963
·
IF 0
Di Hongcheng,Jiang Zhuwu,Sun Fengyi,Yang Jiahan,Cheng Wei,Lu Jiahui,Zhang Hongyu,Bai Xue
Nitrogen-containing disinfection by-products (N-DBPs) produced in the process of drinking water disinfection are widely concerning due to the high cytotoxicity and genotoxicity. It is due to the difficulty of natural degradation of N-DBPs in water and the fact that conventional treatment systems do not effectively treat N-DBPs in drinking water. In this study, N-nitrosopyrrolidine (NPYR) in water was electrocatalytically degraded by a three-dimensional electrode reactor (3DER). This system applied graphite plates as anode and cathode. The granular activated carbon (GAC) was used as third electrode. The degradation of NPYR using a continuous flow three-dimensional electrode reactor was investigated by examining the effects of flow rate, current density, electrolyte concentration, and pollutant concentration on the degradation efficiency, energy consumption, and reaction kinetics of GAC particle electrodes. The results showed that the optimal operating conditions were flow rate = 0.45 mL/min, current density = 6 mA/cm 2 , Na 2 SO 4 concentration = 0.28 mol/L, and NPYR concentration = 20 mg/L. Under optimal conditions, the degradation of NPYR exceeded 58.84%. The main contributor of indirect oxidation was deduced from free radical quenching experiments. NPYR concentration was measured by GC–MS with DB-5 capillary column, operating in full scan monitoring mode for appropriate quantification of NPYR and intermediates. Based on the identification of reaction intermediates, a possible pathway for the electrochemical oxidation of NPYR on GAC particle electrodes was proposed.
研究领域:
环境科学
·
化学工程
·
饮用水处理
✓ 已验证
DOI
PubMed
Nature Communications
·
2024
·Vol. 15
·期 1
·1-13
·
IF 14.7
Xu Chenyang,Wang Hongxin,Guo Hongying,Liang Ke,Zhang Yuanming,Li Weicong,Chen Junze,Lee Jae Sung,Zhang Hemin
Developing transparent and efficient photoanodes is a challenging but essential task in tandem photoelectrochemical cell for unassisted solar water splitting without an external bias. Here we report construction of p–n homojunction hematite photoanodes by hybrid microwave annealing-induced single antimony doping, which results in the gradually-increased valence states from the surface to the inside by the unique features of hybrid microwave annealing. The Sb-doped p–n homojunction hematite photoanode exhibits improved performance and displays a good transparency, achieving a stable photocurrent density of ~4.21 mA cm −2 at 1.23 V RHE under 100 mW cm −2 solar irradiation, which is comparable to the reported state-of-the-art hematite photoanodes. More importantly, a parallel-connected stack of six photoanodes of transparent p–n homojunction records a near-theoretical photocurrent density of ~10 mA cm –2 at 1.23 V RHE under standard photoelectrochemical water splitting conditions, which serves as a useful reference for hematite photoanodes and promises its practical application for unbiased photoelectrochemical water splitting.
研究领域:
材料科学
·
能源科学
·
光电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Li-Jing Zhu,Ming Yang,Gang Wang,Zhi-Xiang Zeng,Zheng-Feng Jia
Superoleophobic and anti-oil adhesion behavior has been considered the central character of the materials for removing oil from wastewater. Herein, poly(vinylidene fluoride)/poly(N-isopropylacrylamide) (PVDF/PNIPAM) membranes were fabricated by vapor-induced phase separation (VIPS) and then further post-modified by deposition of sulfonated dopamine (SDA). The resulting membrane has a strong underwater superoleophobicity with an underwater toluene contact angle of 163 ± 2° and an ultralow adhesion force (1.9 ± 0.02 µN) between the surface and the oil. Therefore, it can efficiently remove emulsified toluene from water with a flux of 2211 ± 80 L m −2 h −1 bar −1 and an oil rejection of 99.5 ± 0.4%. This work offers a novel technique for the fabrication of porous membranes with excellent anti-oil fouling performance which will be practically used in the treatment of emulsified oils.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）