JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Kejie Jin,Mian Qin,Xinyi Li,Rui Wang,Yang Zhao,Huan Wang
Semiconductor photocatalysis can be regarded as one of effective strategies to overcome the great challenges encountered with conventional technologies for environmental remediation. In this research, Z-scheme heterostructure composed of core–shell Au@TiO 2 nanoparticles and flower-like Bi 2 WO 6 nanosheets has been successfully prepared through the reverse micelle sol–gel method followed by a hydrothermal process. The structural characteristics, chemical compositions and photoelectrochemical properties of this ternary composite photocatalyst (Au@TiO 2 /Bi 2 WO 6 ) were further investigated in detail. Benefitted from the synergy of the heterojunction construction and metallic surface plasmon resonance effect, the Au@TiO 2 /Bi 2 WO 6 with an optimal mass ratio of Au@TiO 2 to Bi 2 WO 6 exhibited the significantly enhanced photocatalytic activity for degradation of antibiotics under visible-light irradiation, in which the degradation efficiency of sulfamethoxazole (SMX) and tetracycline hydrochloride (TC) could be up to 96.9% and 95.0% within 75 min, respectively. The reaction rate constant for SMX and TC degradation was calculated to be around 0.0425 min −1 and 0.0314 min −1 , which has 7.2 times and 1.9 times enhancement compared with single Bi 2 WO 6 , respectively. In addition, the cyclic stability and photocatalytic mechanism of Au@TiO 2 /Bi 2 WO 6 were further verified. Our primary results provide a feasible strategy to develop core–shell heterostructured photocatalysts with superior performance for the efficient removal of low-concentration antibiotics in water.
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ENERGY CONVERSION AND MANAGEMENT
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2022
·
IF 11.533
Chaoming Wang,Zheng Huang,Tingjun Wang,Xing Liu,Peng Zhu
Organic phase change materials (PCMs) based latent heat energy storage and release media are promising candidate for the utilization of thermal energy from the solar irradiation. However, the poor photo-absorption ability and intrinsic poor thermal conductivity of organic PCMs results in leakage problem and slow thermal energy charging/discharging rates, which makes them unable to utilize directly for thermal energy conversion. Herein, we fabricate a three-dimensional (3D) carboxymethylcellulose sodium-derived carbon aerogel (CCA) and organic PCM composite with highly efficient light-thermal-electric energy conversion and storage capability. The porous and interconnected CCA15 is prepared firstly through crosslinking, freeze-drying and pyrolysis of carboxymethylcellulose sodium-based hydrogel. The organic PCM of polyethylene glycol (PEG) is then impregnated into the porous CCA15 via vacuum infiltration technique to obtain the PEG/CCA15 composite that had good form-stability, fusion enthalpy at 185.3 J/g, thermal conductivity at 0.351 W/m·K, and reasonable light-thermal energy conversion efficiency of 71.5% under solar irradiation with intensity of 215 mW/cm 2 . Further results proved that the PEG/CCA15 composite exhibited light-electric energy transformation, storage, and release abilities. The stored thermal energy in the PEG/CCA15 composite absorbed from irradiated solar light could release to power an electronic fan to rotate continuously for 5 min when the solar light was turned off. Hence, the PEG/CCA15 composite has great potential for sustainable solar energy utilization.
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Advanced Optical Materials
·
2022
·Vol. 10
·期 17
·2200930
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IF 10.05
Fei Xu,Xiang Wang,Yue Li,Beng Jiang,Zuoru Dong,Zichen Yang,Jiaxing Kang,Xin Shu,Zuimin Jiang,Feng Hong,Run Xu,Zhongquan Ma,Teng Chen,Zhan Xu,Haitao Xu
Corrugated 2D antimony-halide perovskites such as Cs 3 Sb 2 Cl 9 (CSC) are promising candidates for single-source white-light emission due to their ultra-broadband spectra. However, CSC has a serious luminescence quenching phenomenon due to inadequate confinement of excitons. By the homovalent substitution of trivalent antimony cation Sb 3+ by a small amount of trivalent rare earth (RE) cations RE 3+ , the photoluminescence intensities from high-quality Cs 3 (Sb 1− x RE x ) 2 Cl 9 (CSRC) (RE = Ce, Sm, Nd, Y, Er, etc.) films at room temperature (RT) are over two orders of magnitude higher than that of CSC film. Especially, the photoluminescence quantum yield (PLQY) for the Cs 3 (Sb 0.995 Er 0.005 ) 2 Cl 9 film is 9.5% at RT, which is much higher than A 3 B 2 X 9 perovskites previously reported for single-source white-light lighting. Furthermore, the Cs 3 (Sb 0.995 Er 0.005 ) 2 Cl 9 film exhibits an ultra-broadband emission with the full width at half maximum reaching 554 meV at RT, resulting in a “warm” white-light with the CIE coordinate (0.33, 0.46) and the correlated color temperature of 5450 K. The PLQY enhancement can be considered as the fact that a high activation energy by bandgap widening effect and Type-I-like “straddling” band alignment between Cs 3 Sb 2 Cl 9 and Cs 3 Er 2 Cl 9 lead to reducing nonradiative losses and increasing radiative recombination channels. Meanwhile, the spectral broadening can be considered to be attributed to strong effect of electron–phonon interaction.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Min Liu,Mengjie Lu,Huihui Xie,Xiaojuan Fu,Yao Wang,Weidong Zhang,Yahong Xie,Ying Qi
Herein, flower-like Bi 2 WO 6 /BiOCOOH heterojunction photocatalysts were synthesized by one-pot method. Morphological characterizations had demonstrated that the Bi 2 WO 6 nanoparticles were tightly anchored on the surface of BiOCOOH, which indicated that the successful synthesis of the Bi 2 WO 6 -BiOCOOH photocatalysts. Compared with pure BiOCOOH and Bi 2 WO 6 , the Bi 2 WO 6 /BiOCOOH photocatalysts had exhibited a red shift in absorption edge and enhanced visible light absorption. EIS, PL and photocurrent response results suggested that the form of the Bi 2 WO 6 -BiOCOOH heterojunction facilitated the separation of photogenerated electron and hole pairs. Furthermore, the photoactivity of Bi 2 WO 6 /BiOCOOH were evaluated by the photocatalytic degradation of tetracycline (TC) and ciprofloxacin (CIP) under the simulated sunlight irradiation. The results manifested that the W/Bi-2 photocatalyst exhibited the best photocatalytic activity, which TC was degraded by 88 % within 75 min and CIP was degraded by 90 % within 90 min. The improvement of photocatalytic activity was mainly attributed to the decrease in the composite rate of photo-induced electron-hole pairs. Radical trapping experiments and EPR results indicated that holes (h + ) and superoxide radicals ( · O 2 – ) were dominant during the degradation of TC. The possible photocatalytic mechanism was discussed based on the band structures of BiOCOOH and Bi 2 WO 6 .
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ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Runwei Yu,Yu Cao,Kai Chen,Yi Li,Wei Liu,Baozong Li,Hongkun Li,Yonggang Yang
Polymer-stabilized cholesteric liquid crystal (PSCLC) films have been widely studied for their application as sensors, polarizers, and reflective windows. However, the preparation of programmable and colorful patterns based on the structural color is still challenging. Herein, the photochromic CLC mixtures were prepared by adding a photoisomerizable chiral additive (CA) and a photoinitiator in the nematic liquid crystal LC242. Under UV irradiation with weak intensity, photoisomerization of the CA was carried out and photopolymerization was suppressed by oxygen inhibition. With extending the irradiation time, the helical pitch of the CLC film increased and the selective Bragg reflection band tended to redshift. Under strong UV irradiation, oxygen inhibition was overcome and photopolymerization dominates the reaction. Therefore, the colorful-patterned PSCLC films were able to be prepared using masks. The results shown here not only give us a better understanding of the effect of oxygen inhibition but also lay the foundations for practical applications such as decoration and optical devices.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Shuai Wei,Zhijun Li,Zeyu Lyu,Dashuai Sun,Sida Shen,Jianhui Wang,Chengyu Zhuo,Hongpeng You
In this work, we provide a paradigm how to realize white light emission by utilizing the energy transfer from the Bi 3+ to Eu 3+ ions. First, a novel Bi 3+ activated phosphor set of highly oxygen-deficient perovskite derivatives (Ba 3 YGa 2 O 7.5 , BYGO) were synthesized through the conventional high-temperature solid-state method. The crystal structure was confirmed by Rietveld refinement . Then, Eu 3+ was introduced to the phosphor composition to construct energy transfer pathway with Bi 3+ . The emission color of the BYGO:Bi 3+ ,Eu 3+ phosphors can be changed from cyan to white and orange-red by altering the Bi 3+ /Eu 3+ doping ratio. The energy transfer from the Bi 3+ to Eu 3+ ions was ascribed to dipole-dipole interaction. Finally, a single-component WLED device with a color-rendering index of 84.9 was successfully prepared by employing a near-ultraviolet chip and the BYGO:Bi 3+ ,Eu 3+ phosphors. This work not only indicates that the as-prepared BYGO:Bi 3+ ,Eu 3+ phosphors are a potential candidate for near-ultraviolet WLED, but also demonstrated that energy transfer is an avenue for single-phased white light emission.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Hongtao Wei,Tianxiao Peng,Bingxing Wang,Yongcai Zhang
MnFe 2 O 4 is a potential magnetic visible-light photocatalyst , but its photocatalytic efficiency is badly restricted by the high recombination rate of its photogenerated electrons and holes. This work used conjugated polyvinyl chloride derivative (CPVC) to couple MnFe 2 O 4 to boost its photocatalytic efficiency. CPVC/MnFe 2 O 4 nanocomposites with an n-p heterojunction structure were prepared by an easily implementable three-step approach. When applied to the photocatalytic reduction of aqueous hexavalent chromium (Cr(VI)) with the help of visible-light (λ > 420 nm), the CPVC/MnFe 2 O 4 nanocomposite synthesized under the optimized conditions (CPVC/MnFe 2 O 4 -2) demonstrated not only superior photocatalytic activity than MnFe 2 O 4 nanoparticles and many other recently reported visible-light photocatalysts, but also remarkable durability. In addition, CPVC/MnFe 2 O 4 -2 also had strong magnetism and could be effectively separated from the solution by attraction with a magnet. According to the results of structure and photoelectrochemical characterization, the superior photocatalytic activity of CPVC/MnFe 2 O 4 -2 largely results from its bigger specific surface area and improved photogenerated charge separation and transfer capability. This work suggests that a new cost-effective, efficient and magnetically recoverable visible-light photocatalyst may be developed by coupling MnFe 2 O 4 with CPVC.
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Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 14
·1973-1981
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IF 8.683
Xi Xie,Xu Xu,Qixuan Zhu,Shaorong Lu,Yuqi Li,Yongkang Bai
Smart materials with reversible shape transformation have drawn enormous interest for their potential applications in various fields. Herein, we show a novel reversible shape change bilayer material based on a shape memory polymer layer and a passive silicone layer, which can exhibit excellent thermo- and near infrared (NIR) light-induced reversible multi-shape memory performance. The NIR light responsiveness of the material is achieved by the introduction of tannic acid/ferric ion coordination, while the multi-shape memory effect originated from the wide glass transition temperature of the shape memory polymer layer. Based on the shape recovery stress at elevated temperature and resilience force of the silicone layer during the cooling process, thermo- and NIR light-induced reversible multi-shape memory performance is realized. Moreover, the practicability of the bilayer material as a light-driven actuator and temperature sensor is also investigated, demonstrating its versatile application potential as an actuator and sensor.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 37
·56379-56392
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IF 5.19
Hu Ximin,Han Wenyuan,Zhang Manqi,Li Degang,Sun Hongqi
Carbon quantum dots (CQDs) can be used to modify TiO 2 to extend the light absorption threshold and enhance its photocatalytic efficiency. In this study, different amounts of CQDs modified TiO 2 (CQDs-x/TiO 2 ) were synthesized by a facile, mild, and environmental friendly hydrothermal method at a low temperature. The physicochemical properties were investigated by a variety of advanced characterization techniques. It was found that the anchoring of CQDs endowed the CQDs-x/TiO 2 with a large specific surface area, which is beneficial to adsorb more organic pollutants and promote the rate of photocatalytic oxidation. The XRD results also showed that the in situ formation of CQDs on the surface of TiO 2 made the crystallinity of TiO 2 tend to be complete. Among these photocatalysts, CQDs-20/TiO 2 showed the highest pollutant removal efficiency under visible light irradiations. The classical quenching tests revealed that the O 2 •− , • OH, and hole (h + ) were the oxidizing species. Among them, h + was the primary factor contributing to the degradation. The electrochemical tests showed that the anchoring of CQDs on TiO 2 increased the photocurrent by about four times, as compared with the pure TiO 2 . In particular, the cyclic voltammetry results showed that the photo-generated electrons of CQDs were freer to transfer to TiO 2 under visible light irradiations, promoting the separation of photo-generated electrons and holes. This study explains adequately why the CQDs/TiO 2 system has a good photocatalytic degradation of organic compounds.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Ji-Ning Yang,Huan-Huan Yang,Ming-Shuang Niu,Hao Zhou,Xianliang Yi,Da-Lei Chang,Jingjing Zhan,Yang Liu
Under the background of indoor air formaldehyde decontamination , a freestanding ultra-light assembly was fabricated via ice-templating approach starting from MnO 2 nanoparticles and environmentally benign agar powder. The 3D composite of agar and MnO 2 (AM-3D) was comparatively studied with powdered counterparts (including pure MnO 2 and mixture of agar and MnO 2 ) and the 3D-structured agar for formaldehyde oxidation, and their physicochemical properties were examined with XRD , ATR, SEM, XPS, isothermal N 2 adsorption, ESR, Raman, CO-TPR and O 2 -TPD. For the single test of formaldehyde oxidation, the AM-3D catalyst exhibited 62.0%–67.0% removal percentage for ~400 mg/m 3 formaldehyde, which did not demonstrate significant advantage over the control samples. However, thanks to the porous 3D agar scaffold with large spatial volume that could promote a rapid gas-phase formaldehyde concentration reduction, and the strong interaction between the dispersed MnO 2 particles and agar substrate that could afford a large amount of reactive oxygen species to further oxidize the adsorbed formaldehyde, the AM-3D composite was a much better HCHO-to-CO 2 converter and possessed much more advantageous stability for repeated cycles of formaldehyde oxidation: even after ten cycles, there was still 41.7% of formaldehyde removed. Furthermore, the viable sunlight irradiation could easily restore the activity of the used AM-3D catalyst back to the level approaching that of the fresh one. Finally, reaction pathways were put forward via the infrared spectroscopic and ion chromatographic investigations on the surface intermediates of the spent materials.
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高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 11
·2102848
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IF 10.05
Xiaoxiao Xu,Ting Zhu,Ke Xiao,Yu Zhu,Jiaming Chen,Dongke Li,Ling Xu,Jun Xu,Kunji Chen
The preparation of high-efficiency perovskite light-emitting devices (PeLEDs) in the air-ambient has always been a challenge. Herein, the authors propose a Si-based near-infrared air-processed PeLED through the anti-solvent engineering. Two materials, poly(methyl methacrylate) (PMMA) and tetrabutylammonium hexafluorophosphate (TBAPF 6 ) are co-doped into the anti-solvent, the former protects the perovskite from degradation in a high-humidity atmosphere, and the latter passivates the defects on perovskite surface and increases the conductivity. Through the anti-solvent engineering, the efficiency of PeLEDs has been significantly enhanced and obtains a maximum external quantum efficiency (EQE) of 10.4%, which is the highest among similar devices. This work shows that it is possible to prepare high-efficiency near-infrared PeLEDs in air-ambient through a simple method.
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ENVIRONMENTAL ENGINEERING SCIENCE
·
2022
·Vol. 39
·期 3
·259-267
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IF 2.172
Yue Sun,Lijiang Tian,Bingkun Liu,Fulong Chen,Sijie Ge
In this article, Mn/I-TiO2 nanocatalyst was prepared by sol-gel method and used as the photocatalyst to discompose the gaseous benzene in the visible light. The crystal phase composition and grain size of the photocatalyst were investigated by X-ray diffraction and Raman, respectively. X-ray photoelectron spectroscopy and ultraviolet-visible diffuse reflectance spectroscope were used to study the surface elements and bandgap width of the photocatalyst. The research findings suggested that the crystal type of all catalysts was anatase. TiO2 nanoparticle doped by Mn/I could reduce its crystallite size and augment lattice distortion because of the formation of oxygen vacancies. The generation rate, migration rate, and disintegration rate of electron-hole pairs were increased by modification of TiO2. Meanwhile, the Mn-TiO2 was recognized with the smallest bandgap among four kinds of catalyst. Mn-TiO2 catalyst exhibited the highest efficiency on gaseous benzene removal (37.86%) among pure-TiO2 (3.33%), I-TiO2 (30.21%), and Mn-I-TiO2 (31.56%) under visible light. Correspondingly, the photocatalytic ability of pure-TiO2, I-TiO2, Mn-I-TiO2, and Mn-TiO2 was 51.25 μg C6H6/(g·h), 424.36 μg C6H6/(g·h), 493.61 μg C6H6/(g·h), and 245.43 μg C6H6/(g·h), respectively.
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