CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Mingjie Liu,Peipei He,Hantao Gong,Zhenghua Zhao,Yueming Li,Kai Zhou,Yuemin Lin,Jing Li,Zongbi Bao,Qiwei Yang,Yiwen Yang,Qilong Ren,Zhiguo Zhang
Direct synthesis of hydrogen peroxide (H 2 O 2 ) using oxygen and water through the photocatalytic route is a prospective approach for the on-site production of H 2 O 2 . However, the limited varieties of photocatalytic sites and ambiguous structure-active relationship impede the development of environmentally friendly technology. Herein, we report a active compound (benzotrithiophene, BTT) for the photosynthesis of H 2 O 2 using oxygen and water, and design four benzotrithiophene-based 2D covalent organic frameworks (BTT-COFs) linked with aromatic amines linkers. Significant enhancement in photocatalytic activity has been observed via the introduction of BTT struct into 2D COFs. The high crystallinity of COFs increases the visible light absorption ability and photostability of BTT. The suitable distance of BTT struct in COFs and the construction of donor–acceptor (D-A) structure further promote the carrier generation and transfer. The COF-BTT-TAPT exhibited the highest H 2 O 2 production rate of 620 μmol g −1 h −1 . Mechanism investigation experiments have given the validation that BTT-COFs efficiently reduce oxygen in pure water to form H 2 O 2 under visible-light irradiation. This work paves a revolutionary way for designing and fabricating high-performance metal-free photocatalysts for visible-light-driven H 2 O 2 production.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Jiani Gao,Yilong Chu,Yuyang Yan,Shuangshuang Zhou,Xiaowei Li,Cheng-Bo Li
Here, poly(1,3,5-tri(thiophene-2-yl)benzene) (PTTB) membrane electrodes with porous surface structures were prepared by using an electropolymerization method. Firstly, a series of PTTB film electrodes with different morphologies are obtained, including open nanotubes , stacked flocs, dispersed cauliflower-like, and aggregated spheres, by separately depositing the PTTB films on different conductive substrates (GCE, silicon wafers, ITO , FTO). Secondly, this study explored the factors affecting the photoelectric properties and stability of PTTB film electrodes by varying the solvent, electrochemical method, scan rate, and number of scan cycles. Finally, the CV method and DCM/ACN mixed solvent were used in this experiment, and the best photoelectric effect of 3.2 μA was obtained under 3 scan cycles. In this study, the factors influencing the properties of PTTB by electrochemical polymerization methods are obtained through the exploration of PTTB film electrodes, providing a reference value for further combining PTTB films with other materials to prepare composite photoelectrodes .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2025
·
IF 2.5
Kong Yucheng,Liu Xuyang,Jiang Wenjuan,Li Xiaochuan
A photochromic dye ( TPDA ) with helical structure was configured by attaching triangle terthiophene to triphenylamine units. It exhibits typical photochromic behavior when irradiated with UV (390 nm)/visible light (> 410 nm). Moreover, TPDA in tetrahydrofuran (THF) can be switched alternately between color and colorless state. In addition, it exhibits highly emissive character in THF and could emit bright blue fluorescence by UV irradiation. And the fluorescence emission efficiency was estimated to be 0.41. Under the UV light irradiation, a ring-closure reaction occurred and the blue fluorescence was quenched effectively at the same time. At photo-stationary state, the quantum yield was lowered to 0.10. Therefore, a switch controllable fluorescence “on–off” molecular system was developed when light irradiation cycle established (UV/visible light). Optimization of the dye structure was performed using density functional theory at the DND/B3LYP level of theory. The structural analysis reveals that the shorter distance between reactive atoms (< 4.2 Å) in the triangle terthiophene unit promotes the smoothly photochromism of TPDA .
研究领域:
有机化学
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材料科学
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光化学
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Keke Zhang,Fengwei Huang,Xiaoyun Dong,Kanghui Xiong,Xianjun Lang
To optimize the activity at the molecular level, conjugated microporous polymers (CMPs) can be tailored through monomers for visible light photocatalysis . Benzotrithiophene (BTT) is the select monomer for CMPs because of its planar and electron-rich properties. Notably, the sp 2 -carbon conjugation of BTT is highly desirable to facilitate electron transfer . Herein, the condensation of 1,4-phenylenediacetonitrile and 4,4′-biphenyldiacetonitrile with benzo[1,2-b:3,4-b':5,6-b'']trithiophene-2,5,8-tricarbaldehyde assembles two CMPs, sp 2 c-BTT-CMP-1 and sp 2 c-BTT-CMP-2, respectively. Systematic materials characterizations and density functional theory calculations on sp 2 c-BTT-CMP-1 and sp 2 c-BTT-CMP-2 are performed to interpret the essential optoelectronic attributes. Due to the different linkages and π-conjugations, sp 2 c-BTT-CMP-2 presents a better built-in electric field than sp 2 c-BTT-CMP-1, edging toward facile dissociation and fast transport of charge carriers. Consequently, sp 2 c-BTT-CMP-2 is superior to sp 2 c-BTT-CMP-1 for the green light-triggered oxidation of amines to imines with dioxygen. This study underlines the promising aspect of BTT-based CMPs with a fitting linkage as state-of-the-art functional materials for semiconductor photocatalysis.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Lei Chen,Kexin Hu,Jiaqi Wang,Guangyu Ge,Ran Ma,Yongning Wu,Qinghua He
The simultaneous detection and removal of Ag + from drinking water was crucial for preventing human health, while it was also extremely challenging due to bifunctional materials that combine both Ag + adsorption and detection functions rarely being explored. In this study, a benzotrithiophene-based covalent organic framework (TAPA-BTT) was synthesized and applied to detect and remove Ag + . TAPA-BTT exhibited high crystallinity, a large specific surface area, and good thermal stability. As a fluorescent probe, TAPA-BTT had a low detection limit (0.14 μg/L), wide linear range (0.2-700 μg/L), and good linearity (R 2 > 0.9948). It was also successfully applied to identify Ag + in drinking water including tap, pure, and mineral water with satisfactory detection performance. Moreover, TAPA-BTT had a high efficiency in removing Ag + from water, offering a high capacity for adsorption (344.83 mg/g) and a removal rate of 99.45%. The adsorption of TAPA-BTT towards Ag + can be well explained by the quasi-second-order kinetic model and the Langmuir isotherm model. In addition, experimental and theoretical studies revealed the interaction mechanism between TAPA-BTT and Ag + . The specific Ag + detection by TAPA-BTT was assumed to be caused by the electron transfer from thiophene-S to Ag + , which enhanced the fluorescence of TAPA-BTT. The effective removal of Ag + was attributed to the co-chelation of imine-N and thiophene-S on TAPA-BTT. These novel findings revealed the great potential of benzotrithiophene-based COFs in the detection and removal of Ag + , providing a new strategy and alternative material for monitoring and controlling Ag + in drinking water.
研究领域:
环境科学
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材料科学
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分析化学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Ya Chu,Fei Zhao,Fanpeng Meng,Weiqiang Zhang,Jinsheng Zhao,Xiujuan Zhong
Donor-acceptor conjugated polymers have received significant attention as the most promising photocatalysts for efficient photocatalytic hydrogen production (PHP). Nonetheless, achieving high photocatalytic PHP performance relies on molecular framework design and the judicious selection of different structural units. Herein, benzotrithiophene (BTT) and triazine derivatives were used as the basic units of organic polymers , and two conjugated porous polymers (CPPs) named as CP1 and CP2 were successfully synthesized by Stille coupling reaction . Compared with benzene as the linkage unit of triazine, it is evident that the incorporation of the thiophene unit in CP2 broadens its light response range, and promotes the generation of electrons/holes induced by light. Density functional theory (DFT) calculations and femtosecond transient absorption(fs-TA) spectroscopy reveal that CP2 effectively inhibits the photogenerated electron-hole pair recombination and promotes carrier transport. Remarkably, CP2 with Pt co-catalyst exhibited a notably superior PHP performance compared with that of CP1 polymer, which achieved an impressive hydrogen evolution rate (HER) of 21702.4 μmol/g/h, surpassing CP1 by approximately 3.7 times. This work provides a new tactic for enhancing the intrinsic PHP activity and reveals the underlying mechanism for the enhanced photocatalytic activity by regulating the different structural units of the donor-acceptor conjugated polymers .
研究领域:
材料科学
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光催化化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2014
·Vol. 36
·期 9
·1597-1605
·
IF 1.455
Ruxangul Jamal,Ahmat Ali,Li Zhang,Yakupjan Osman,Adalet Rahman,Tursun Abdiryim
Poly(3′,4′-ethylenedioxy-2,2′:5′,2″-terthiophene)/ZnO(poly(TET)/ZnO) composites with the ratio of poly(TET) and nano-ZnO from 3:1 to 1:3 were synthesized by hand grinding and ball milling methods, respectively. The photocatalytic activities of the composites were examined through the degradation processes of methylene blue (MB) solution under UV light irradiation, and the possible mechanism for the photocatalytic activity enhancement by synergetic effects between nano-ZnO and poly(TET) was proposed. The results showed that the strong interactions between the poly(TET) and nano-ZnO occurred in the case of ball milling method. The results also proved that the crystallinity of ZnO was not disturbed in both of methods, and the nano-ZnO was uniformly distributed in polymer matrix in the case of ball milling method. The comparative studies showed that the addition of the nano-ZnO could enhance the photocatalytic activities of the composites. The highest degradation efficiency (100%) at 3 h under UV light irradiation occurred in the case of poly(TET)/ZnO(1:1) synthesized by ball milling method. Furthermore, the nanocompsosite displayed higher photocatalytic activity than nano-ZnO, which was due to the holes ( h + ) transferring from the valence band of ZnO to the polymer backbone and the adsorption of MB molecules in polymer matrix via π–π conjugation between MB and aromatic regions of the poly(TET). POLYM. COMPOS., 36:1597–1605, 2015. © 2014 Society of Plastics Engineers
研究领域:
材料科学
·
环境科学
✓ 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）