SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Lixian Wang,Lizhi Zhao,Xianglong Xiao,Xiaofu Wang,Jiayi Cao,Hui Ye,Hong Li,Yuzhong Zhang
Wastewater discharged from the textile industry contains large amounts of dyes and salts, causing serious pollution to the environment. Loose nanofiltration (LNF) membranes offer a promising solution for dye/salt separation. However, membrane fouling is a critical issue affecting the membrane performance. Here, polyether amine (PEA) is used as the aqueous monomer for interfacial polymerization to prepare a polyamide (PA) LNF membrane, and peroxidase-like Cu-FeTCPP nanosheets are embedded into the PA layer to develop the Nanozyme@PA membrane. The nanozyme-incorporated membrane has a thinner and enhanced porous active layer than PA membrane, resulting in higher water permeance (maximum of 80.7 L·m −2 ·h −2 ·bar −1 ), notable rejection of dyes (CR, >99.2 %) but low rejection of inorganic ions (NaCl, <6.4 %). The optimum dye/salt separation factor of Nanozyme@PA reaches 218.7. The loaded nanozyme can catalyze the degradation of dyes adsorbed on the membrane surface in the presence of hydrogen peroxide within 10 min, without the need for special operation, enabling the recovery of water permeance. This nanozyme functionalized LNF membrane with good permeability, selectivity and self-cleaning offers an efficient approach to dye wastewater treatment as well as an insight for membrane fabrication assisted by two-dimensional nanozyme.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Xuehua Zhang,Lin Lin,Dan Qu,Jiangong Yang,Yuxiang Weng,Zhuan Wang,Zaicheng Sun,Yong Chen,Tao He
Developing highly efficient photocatalysts for solar-fuels production under visible-light irradiation is of great promise, but still remains a big challenge. In this work, we use g-C 3 N 4 incorporated with carbon dots as the photosensitizer to couple with tetra(4-carboxyphenyl)porphyrin iron(III) chloride (FeTCPP) molecular catalyst. The obtained g-C 3 N 4 -C 0.05 /FeTCPP hybrid photocatalyst exhibits high activity for the solar-fuels production of CO and H 2 under visible-light irradiation, with CO yield of 23.1 mmol/g and H 2 yield of 71.1 mmol/g in 6 h. The enhanced mechanism has been studied by various techniques like photocurrent response, photoluminescence and mid-infrared femtosecond transient absorption. The presence of trace amount of carbon dots in the system can provide an alternative channel for the electron transfer, i.e., from g-C 3 N 4 to FeTCPP via the CDs. Accordingly, the interfacial charge separation and electron transfer can be promoted, leading to enhanced photocatalytic performance of the g-C 3 N 4 -C x /FeTCPP hybrid photocatalysts.
研究领域:
材料科学
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能源化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
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IF 4.439
Pan Li,Chunchao Hou,Xuehua Zhang,Yong Chen,Tao He
The hybrid coupling between inorganic semiconductor and molecular catalyst can provide a promising approach for the construction of highly efficient and selective photocatalytic CO 2 reduction systems. This hybrid system can take full advantage of the strong light harvesting capability of semiconductor and high selectivity of molecular catalyst. The interaction linker bridging the semiconductor and molecular catalyst plays an important role in supplying efficient electron transfer channels. In this study, both CdS with and without ethylenediamine functionalization (i.e., CdS-EF and CdS) have been successfully synthesized and further respectively coupled with tetra(4-carboxyphenyl)porphyrin iron(III) chloride (FeTCPP) for CO 2 photoreduction. It is found that CdS-EF exhibits inferior photocatalytic activity to CdS, while CdS-EF/FeTCPP hybrid photocatalyst shows much higher activity than CdS/FeTCPP. This is because hydrogen bonding exists between the amino groups in CdS-EF and carboxyl groups in FeTCPP, which can act as electron transfer channels from CdS to FeTCPP in the obtained hybrid system.
研究领域:
材料科学
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光催化
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环境化学
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无机化学
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分子催化
✓ 已验证
DOI
高影响因子
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2025
·Vol. 95
·期 7
·1670-1685
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IF 0.8
Liu X.,Yue Q.-x.,Wang Y.-h.,Lei M.-d.,Zhang Y.-l.,Zhang Y.-w.,Ji A.-l.,Zhang Y.-c.,Zhang X.-q.,Ding R.,Liu J.
The catalytic performance and mechanism of the prepared iron meso-tetra (4-carboxyphenyl) porphyrin (FeTCPP) on oxygen reduction reaction in alkaline environments were studied. At high concentrations of FeTCPP, the oxygen reduction reaction followed an efficient direct 4-electron transfer mechanism instead of 2+2 electron transfer mechanism. The central iron ion in FeTCPP underwent redox reactions from Fe III to Fe II . O 2 molecules formed a superoxide anion coordination complex with Fe II TCCP, transferring an electron from the central iron ion. Protonation of the complex formed a superoxide hydrogen radical complex, which then acquired another electron, generating a hydroperoxide radical and completing the first 2-electron reduction. The peroxide formed a coordination complex with Fe II TCCP to produce a peroxide complex Fe III TCCP:O 2 – with intramolecular charge transfer. And then it acquired two electrons, completing the second 2-electron reduction and being reduced to OH – . When the concentration of Fe III TCCP was high, the complex Fe III TCCP:O 2 – could protonate without stepwise reactions, directly acquiring three electrons from the electrode surface and being reduced to OH – . The oxygen reduction reaction exhibited a 4-electron mechanism. Both the 2+2 and 4-electron pathways occurred simultaneously, with the 4-electron pathway becoming more prominent as the concentration of FeTCPP increased.
研究领域:
电化学
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催化
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材料科学
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物理化学
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纳米技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Pan Li,Xuehua Zhang,Chunchao Hou,Yong Chen,Tao He
Fabrication of hybrid system coupling inorganic semiconductor photosensitizer with molecular catalyst provides a promising approach to achieve highly efficient CO 2 reduction into solar fuels, as the semiconductor nanomaterials can meet the prerequisites of visible-light photoresponse and high charge-separation efficiency for achieving high photocatalytic efficiency. In this work, CdS/Bi 2 S 3 heterostructures have been prepared via an ion-exchange reaction and employed as the photosensitizer to couple with tetra(4-carboxyphenyl)porphyrin iron(III) chloride (FeTCPP) molecular catalyst for photoreduction of CO 2 into CO and H 2 under visible-light irradiation. The sulfur vacancy in CdS surface can be reduced by the formation of CdS/Bi 2 S 3 heterostructure. The content of Bi 2 S 3 can be modulated via tailoring the ion-exchange reaction time. The resulting effect on the performace of CO 2 photoreduction has been investigated in detail. Benefiting from the enhanced separation and utilization of charge carriers, CdS/Bi 2 S 3 -0.5 h/FeTCPP hybrid catalyst exhibits 8.2 times CO yield (1.93 mmol/g/h) and 1.7 times H 2 yield (6.08 mmol/g/h) of CdS/FeTCPP hybrid catalyst. More important, the results of energy level alignment, electron spin resonance and photocatalysis indicate that electron-transfer direction can be changed once the CdS/Bi 2 S 3 heterostructure is coupled with FeTCPP. In the CdS/Bi 2 S 3 heterostructure, electrons transfer mainly from the conduction band of CdS to Bi 2 S 3 , while it is mainly from the conduction band of CdS to FeTCPP in the CdS/Bi 2 S 3 /FeTCPP hybrid.
研究领域:
材料科学
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光化学
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催化
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可再生能源
✓ 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）