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.
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NANO
·
2018
·
IF 1.1
Xu Yan,Ziyang Wu,Yong Zhao,Biao Liu,Yubin Tang
Silver nanoparticles (NPs) and related semiconductors are a family of very important and widely applied photocatalysts. However, the preparation of high stability and activity of this photocatalyst is still a challenge. In this work, we report a stable Ag/AgCl/AgBi(MoO 4 ) 2 heterojunction photocatalyst fabricated via a simple in situ anion-exchange reaction followed by the photoreduction treatment. In the treatment of tetracycline (TC) wastewater under visible light, the AC-0.4 sample (prepared with 0.4 mmol KCl) exhibits the significantly improved activity (degradation ratio, DR of 71.3%) compared with the pristine AgBi(MoO 4 ) 2 (30% DR) and Ag/AgCl sample (synthesized by the photoreduction of AgCl) (37% DR) under identical experimental conditions. This activity promotion is from the fast interfacial electron transfer between the heterojunction phases of AgCl/AgBi(MoO 4 ) 2 and the SPR effect of Ag NPs. After five successive recycles, the AC-0.4 sample still maintains good stability and activity for TC degradation, which shows a great potential to be used in practical application. Through the ESR and controlled scavenged experiments, we found the • OH and • O 2 − are the major reactive intermediate species in the TC photodegradation reaction. Our work provides a new insight into the synthesis of stable and high efficient Ag-based heterojunction photocatalysts for the application of wastewater treatment.
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Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 35
·8061-8070
·
IF 5.344
Chengzhen Chu,Zhen Xiang,Jiao Wang,Hui Xie,Tao Xiang,Shaobing Zhou
Implanting a stent in the body through a minimally invasive operation and tracking its location in real-time is still a challenge. Herein, a near-infrared (NIR) light-triggered shape-memory polymer possessing a long-time fluorescence imaging function has been developed by cross-linking 6-arm poly(ethylene glycol)–poly(ε-caprolactone) using a croconate dye YHD798 as the chemical crosslinker and NIR-absorption perssad. Due to the extraordinary photothermal conversion property of YHD798, the temperature of the material raised from 20 °C to 120 °C under 808 nm near-infrared irradiation at 0.4 W cm−2, leading to shape recovery in 50 s in a programmed shape-transition process. YHD798 also exerted an aggregation-induced emission effect, endowing the polymer with a clear NIR fluorescence imaging function even when covered by a 2 mm pork slab and could be used for the real-time visualization of the implanted device fabricated from this polymer in deep tissues of the body. When a tubular stent that was fabricated from this polymer, was implanted into the carotid artery of a Sprague-Dawley rat, it could recover to its permanent shape under 808 nm laser irradiation in 60 s owing to the shape-memory function and facilitated NIR-I fluorescence imaging after implantation for a week owing to the croconate dye. This work provides a new strategy for designing and developing smart polymers with NIR-light-triggered shape-memory effect and long-term fluorescence imaging function for biomedical applications.
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高影响因子
Materials Express
·
2019
·Vol. 9
·期 1
·65-72
·
IF 1.465
Han Xue,Wang Da,Guo Zhongnan,Huang Lin,Peng Yuan,Lin Jiawei,Yuan Wenxia
The SiC/CdS semiconducting composites have been reported to show excellent synergistic effect for the photocatalytic water splitting to produce H2 (J. Mater. Chem. A (2014) 2:6296–6300). In this work, the mesoporous SiC prepared via a one-step nanocasting process
has been adopted to replace the commercial micro-SiC, to improve the weak light absorption of SiC which suppresses the photocatalytic activity in previous literature. It has been demonstrated that the mesoporous SiC/CdS composite with suitable coverage ratio of SiC (with the molar ratio of
SiC:CdS as 1:1) shows stronger light absorption and enhanced charge transfer rate. In consequence, the hydrogen evolution rate reaches 952 μmol · h–1· g–1 in the absence of noble metal co-catalyst, which is two times of the micro SiC/CdS
system. Our work provides an effective route to enhance the photocatalysis in SiC-based heterojunction materials. This strategy can also be extended in other Z-scheme photocatalytic systems.
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Nanoscience and Nanotechnology Letters
·
2017
·Vol. 9
·期 7
·989-997
·
IF 1.889
Liu Xinlin,Qin Yingying,Xing Guoliang,Li Chunxiang,Lang Jihui,Liu Yang,Xing Scott
In this paper, a novel type of core–shell structured ZnFe2O4@CdS composite photocatalyst is successfully synthesized by a facile two-step strategy method. The corresponding morphology, structure and optical properties of developed photocatalyst were well
characterized. The photocatalytic degradation of tetracycline (TC) experiments indicated that the ZnFe2O4@CdS core–shell exhibited a higher photocatalytic activity than the pure ZnFe2O4 and CdS under the visible light irradiation, especially
0.1 g ZnFe2O4@CdS composites with a content of 78 wt.% CdS resulted in 95.31% degradation of 20 mg/L TC in 90 min. with 0.1 g catalyst. Furthermore, the photodegradation mechanism was investigated by trapping experiments, which revealed that .O–2
was the most active species in the photodegradation process. And the possible process of charge transfer for ZnFe2O4@CdS composite photocatalyst was proposed based on the experimental results.
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DYES AND PIGMENTS
·
2017
·
IF 3.473
Qingchen Dong,Feifei Tai,Hong Lian,Zheng Chen,Mingming Hu,Jinhai Huang,Wai-Yeung Wong
Two bipolar host materials H1 ( N -linked carbazole) and H2 ( C-3 -linked carbazole) via changing the substitution position of triazine and carbazole moieties are reported. Their structural and physical properties were fully characterized. The thermal analysis demonstrated that both H1 and H2 are of high thermal stability. The triplet energy levels of H1 and H2 were determined to be 2.64 and 2.7 eV, respectively. Both green and blue OLEDs with H1 and H2 acting as host materials were fabricated to investigate their performances in PHOLED . The green PHOLED based on H1 exhibits the best performance with the maximum current efficiency, maximum power efficiency and maximum brightness of 51.7 cd/A, 37.8 lm/W and 132800 cd/m 2 , respectively, while the blue PHOLED based on H2 shows the best performance with the maximum current efficiency, maximum power efficiency and maximum brightness of 21.6 cd/A, 17.2 lm/W and 16640 cd/m 2 , respectively. The characteristic measurements of OLED devices reveal that both H1 and H2 are promising host materials for practical application. By comparing the commercial host materials of 4,4’-bis(carbazol-9-yl)biphenyl (CBP) and N,N-dicarbazoyl-3,5-benzene (mCP), the power efficiencies of green and blue PHOLED were boosted by 22.3% and 75.5%, respectively.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Zihui Wang,Langming Bai,Jinlong Wang,Qian Zhao,Heng Liang,Guibai Li
Improving the nanofiltration (NF) performance of membrane-based treatment is conducive to promoting environmental water recycling and addressing water resource depletion. Combinations of light, electricity, and heat with traditional techniques of preparing membranes should optimize membrane performance. Interfacial polymerization and photopolymerization were integrated to construct a photopolymerized thin-film composite NF membrane with a ridged surface morphology. Under visible light initiation, 2-acrylamido-2-methyl-1-propanesulfonic acid was crosslinked with the polyamide network. The control effects of light on the membrane surface and physicochemical properties were revealed via infrared thermal images and response surface methodology. To present the diffusion motion of piperazine molecules, molecular dynamics simulations were implemented. Through density functional theory simulations, the crosslinking mechanism of the photoinduced NF network was identified and verified. The surface physicochemical characteristics and perm-selectivity performance were systematically illustrated. The photopolymerized membrane outperformed the pristine in permeability and selective separation competence; without degradation of solute repulsion, the water permeation was enhanced to 33.5 L m–2 h–1 bar–1, 6.6 times that of the initial membrane. In addition, the removal of organic contaminants and antifouling capacities were improved. This work represents a novel lead for applying sustainable resources in constructing high-performance membranes for environmental challenges.
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PubMed
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
Jian-Qiang Zhao,Hui Ge,Yu-Fang Wu,Wen-Jie Xu,Kai Xu,Jia-Qian Ma,Qian-Lu Yang,Cheng-Yang Yue,Xiao-Wu Lei
Highly efficient and narrowband blue light-emitting performance is extremely crucial for the optoelectronic applications of organic-inorganic hybrid perovskites . However, the not yet viable approach has been shown to simultaneously improve photoluminescence quantum yield (PLQY) and narrow linewidth of blue light emission. Herein, a new crystal rigidifying strategy is proposed as a viable dual-optimization avenue. Specifically, we perform a post-synthetic technique on hybrid cadmium halides and successfully convert zero-dimensional (0D) DMP-0-CdBr 4 to one-dimensional (1D) DMP-1-CdBr 3 , accompanied by luminescent transformation from sky-blue (470 nm) to deep-blue (432 nm) emissions. The structural evolution from discrete block to infinite chain significantly enhances the crystal rigidity, which results in narrower emission linewidth (89 to 50 nm) and increased color purity (74.5% to 96.7%). Synchronously, the PLQY also realizes a notable enhancement from 14.0% to 52.3%. Systematical characterizations demonstrate that enhanced crystal rigidity simultaneously weakens the electron-phonon interaction and slows down nonradiative decay, which narrows the emission linewidth and boosts the PLQY. The highly efficient light-emitting performance enables them as excellent down-conversion blue phosphors to fabricate solid-state LED giving bright warm white light with high color rendering index of 95.4. This work paves a novel structural optimization way to rationally design or fine-tune high-performance blue-light emitting halides.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2014
·Vol. 16
·期 24
·12008-12013
·
IF 4.198
Yan Gao,Linlin Zhang,Xin Ding,Licheng Sun
Photoactive anodes consisting of Ru(bpy)3 type photosensitizer 1 and molecular catalysts 2 and 3 on nanostructured TiO2 have been assembled in functional devices for successful light driven water splitting. From their performance measurements we found that the photoanode TiO2(1 + 3) in which the molecular ruthenium catalyst and the phosphonate anchoring group are linked by a flexible –CH2CH2CH2– chain showed a significantly higher photocurrent density than the photoanode TiO2(1 + 2) with only –CH2– linkage. The possible reasons for the different water splitting performance of otherwise identical devices are discussed.
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高影响因子
Environmental Science-Nano
·
2020
·Vol. 8
·期 2
·543-553
·
IF 7.683
Hongli Liu,Mingjie Xu,Guiying Li,Weiping Zhang,Taicheng An
Adsorption is an attractive technique for the removal of volatile organic compounds (VOCs) from polluted air; however, it is still challenging to efficiently release adsorbed VOCs. Herein, in consideration of the unprecedented VOC adsorption capability of MOFs and excellent photothermal effects of Ag nanoparticles, a novel photodynamic Ag/UiO-66 adsorbent was constructed by integrating Ag nanoparticles with UiO-66 using a colloidal deposition method. The obtained Ag/UiO-66 samples were found to possess the excellent porosity and high styrene adsorption capability of parent UiO-66. Upon exposure to simulated solar light, Ag nanoparticles could convert light energy into thermal energy, which gave rise to light-induced localized heat near Ag nanoparticles. Subsequently, this localized heat triggered the thermal desorption of the adsorbed styrene from Ag/UiO-66, thus successfully realizing efficient in situ regeneration of Ag/UiO-66 under solar light irradiation. Moreover, the desorption capacity can be effectively regulated by the Ag content. More importantly, the regenerability of Ag/UiO-66 remained intact even after five adsorption–desorption cycles; however, pure UiO-66 recovered only 51.6% of its adsorption capacity and maintained 77.0% of its desorption capacity after five cycles. Furthermore, adsorption kinetic parameters and a possible regeneration mechanism are described in detail.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 52
·79184-79198
·
IF 5.19
Zhao Yajuan,Dang Pu,Gao Yaqian,Li Yan,Xie Huidong,Yang Chang
Co 3 O 4 /Bi 4 O 7 /Bi 2 O 3 (CBB) composites were prepared, in which Co 3 O 4 was synthesized from Co-MOF as precursor. The peroxymonosulfate (PMS) activated by CBB catalyst under visible light was used to degrade tetracycline (TC). Owing to the synergistic effect of photocatalysis and PMS activation, 98.4% of TC was removed within 60 min. The optimal loading of Co 3 O 4 was determined, and the influence of PMS dosage, initial pH, and disturbing anions on the degradation effect were investigated. The “CBB + Vis + PMS” system showed good reusability, and the degradation was only reduced by 1.7% after 5 cycles. This system also had a good degradation of other five pollutants. The quenching experiment showed that holes (h + ), superoxide radicals (·O 2 − ), and singlet oxygen ( 1 O 2 ) were the main active species. The degradation products of TC were determined by liquid chromatography-mass spectrometry, and the degradation pathway was proposed. Finally, a double Z-scheme degradation mechanism was proposed in the “CBB + Vis + PMS” system. The peroxymonosulfate activated by CBB under visible light to degrade organic pollutants has widespread application prospects in environmental remediation. Graphical abstract
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高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Wei Zhang,Jiajun Wang,Zewei Liu,Yibing Pi,Rong Tan
Graphitic carbon nitride ( g -C 3 N 4 ) is a fascinating photocatalyst for solar energy utilization in photo-catalysis. Nevertheless, it often suffers from moderate photo-catalytic activity due to its low specific surface area and fast recombination rate of photogenerated electrons upon photo-excitation. Herein, we overcome the bottlenecks by constructing a porous g -C 3 N 4 nanosheet ( PCNS ) through a simple thermal oxidation etching method. Benefited from its porous layer structure, the obtained PCNS exhibits large specific surface area, efficient separation of photogenerated charge carriers, as well as high exposure of active sites. As a result, it is robust and universal in visible light-driven dehydrogenation of alcohols in water under oxidant-free condition. Almost quantitative yields (> 99%) of various valuable carbonyl compounds were obtained over PCNS , while bulk g -C 3 N 4 was far less efficient. Moreover, the photo-catalyst was highly stable and could be facilely recovered from the aqueous system for efficient reuse. The easy preparation and excellent performance made PCNS a promising and competitive photocatalyst for the solar applications.
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