Inorganic Chemistry Frontiers
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2022
·Vol. 9
·期 24
·6418-6424
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IF 7.779
Tianqing Zhang,Xiliang Jiang,Rujia Chen,Bingyan Liu,Weiling Yang,Ce Li,Hai Lin,Huisheng Liu,Chun Li,Fanming Zeng,Zhongmin Su
In the process of developing high-performance LCDs, narrow-band emitting phosphors with excellent performance are indispensable. In this study, a narrow-band blue phosphor BaZnAl10O17:Eu2+ with an emission peak at 433 nm (which can be excited by near-ultraviolet light) and a full width at half maximum of 46 nm was found. The synthesized BaZnAl10O17:Eu2+ phosphor exhibits low thermal quenching behavior. There is only 16.4% loss in emission intensity at 423 K compared to the initial intensity at room temperature. Using the narrow-band emission phosphor BaZnAl10O17:Eu2+ as the blue light source, the prepared white LED device excited using a near-ultraviolet chip emits high-brightness white light (CCT = 4436 K, Ra = 93.96), whose CIE coordinates are (0.3387, 0.3785) and CG can reach 99% of the NTSC standard. The narrow-band blue-emitting BaZnAl10O17:Eu2+ phosphor has potential application value in white light-emitting diodes.
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CARBON
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2022
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IF 11.307
Yunhui Wu,Jiurong Li,Xiujian Zhao,Xiao Gong
Carbon dots (CDs) are a new type of carbon-based fluorescent nanomaterials , which have received a lot of interest because of their excellent properties, simple synthesis and wide applications. However, facial and fast synthesis of CDs with tunable multicolor emission that can be used for lighting still remains a challenge. Here, through a simple one-step solvothermal method, nickel-doped CDs with tunable fluorescence emission are successfully prepared. By optimizing the experimental conditions, fluorescence emission of the as-prepared CDs can be adjusted within a certain wavelength range (513 nm–612 nm), that is, from green to red. The particle size of the CDs also increases from 2 nm to 8 nm. The introduction of Ni can successfully enhance the fluorescence intensity and cause an obvious redshift. In addition, by mixing polyvinylpyrrolidone (PVP) with the multicolor nickel-doped CDs (Ni-MCDs), the self-quenching effect of solid-state fluorescence can be effectively avoided. Based on this, green, yellow and red light-emitting diodes (LEDs) with high performance can be constructed by integrating CDs/PVP composites with different colors on top of the UV chip, demonstrating their superior potential for solid-state lighting applications.
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Catalysts
·
2022
·Vol. 12
·期 11
·1429
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IF 4.501
Yali Song,Huan Zhang,Ziyan Li,Long Huang,Junhao Xie,Long Han,Ruoying Zheng,Yuqing Zhang,Hongzhong Zhang
Previous studies have displayed various conclusions about the effect of preparation factors on the photoreduction property of ZnIn2S4. Therefore, it is not easy to figure out the optimal preparation conditions of ZnIn2S4for Cr(VI) photoreduction. To ensure Cr(VI) reduction efficiency, various ZnIn2S4photocatalysts were prepared in different solvents (i.e., water and ethylene glycol) and temperatures (i.e., 120 °C, 150 °C and 180°C). Different characterization methods were used to explain the difference in optical performance and photocatalytic property among the obtained samples. The results show that all the samples exhibit a similar band gap. The reaction solvent and temperature have a great influence on the surface morphology and optical property, leading to the different photocatalytic properties. ZnIn2S4synthesized at 120 °C in the solvothermal condition shows the optimal efficiency on Cr(VI) photoreduction due to the effective utilization of photo-induced carriers. The reasonable analysis and effective conclusion presented may provide the optimal synthesis method of ZnIn2S4to effectively remove Cr(VI) from water environment.Keywords:ZnIn2S4;Cr(VI);solvothermal;hydrothermal;photoreduction
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Xiaoming Liu,Yinchu Zhang,Hongwei Wang,Jiajun Yan,Liushui Yan,Kexin Li,Huiqin Guo,Wang Gong,Jun Lin
In this work, a series of Zn x Cd 1-x S solid solutions are firstly prepared by a solvothermal process. The optimized composition of Zn x Cd 1-x S solid solution is determined to be Zn 0·2 Cd 0.8 S. On this basis, the Cu 7 S 4 /Zn 0·2 Cd 0·8 S composite photocatalyst with a binary p-n heterojunction has been synthesized by a co-precipitation process followed by a solvothermal method . Owning to the synergistic effect of the heterojunction structure in the interface of Cu 7 S 4 (p-type) and Zn 0·2 Cd 0·8 S (n-type) and the built-in electric field in binary p-n heterojunction, the as-prepared Cu 7 S 4 /Zn 0·2 Cd 0·8 S composite photocatalyst exhibits a significantly improved photocatalytic activity toward hydrogen production from water with visible light response, which is approximately 5.0 times and 16.5 times higher than of pristine Zn 0·2 Cd 0·8 S and CdS, respectively. The possible photocatalytic mechanism has been proposed basing on a series of experimental results. The current work might be valuable inspirations for designing highly efficient heterojunction composite photocatalyst for solar hydrogen evolution .
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Sustainable Energy & Fuels
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2022
·Vol. 6
·期 23
·5261-5267
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IF 6.813
Ke Guo,Guang'an Jie,Jiahui Liu,Yanghe Fu,Rui Ma,Xinqing Lu,Fumin Zhang,Weidong Zhu,Maohong Fan
Photocatalytic selective oxidation in organic synthesis has been emerging as an environmentally friendly and energy sustainable approach to produce valuable chemicals, yet it remains a great challenge. In this study, a vanadium(IV) metal–organic framework constructed from triphenyl-based organic linkers, named BIT-66, was first employed as a photocatalyst for the selective oxidation of amines and sulfides in the presence of molecular oxygen or tert-butyl hydroperoxide (TBHP). BIT-66 possesses efficient visible-light absorption and photoinduced charge generation properties, and exhibits an excellent photocatalytic performance for oxidation reactions to produce valuable imines or sulfoxides with a high selectivity under visible light, as well as good reusability. The reactive oxygen species were further investigated via lots of quenching experiments and electron paramagnetic resonance trapping measurements for photocatalytic reactions. It is found that the superoxide radicals, resulting from the photogenerated electron transfer of the excited BIT-66, could be the main active species in the oxidative coupling of amines, while both hydroxyl and peroxyl radicals together play crucial roles in the oxygenation of sulfides using TBHP as the oxidant. This study demonstrates the great potential of photoactive MOFs for organic transformations to produce valuable chemicals.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Hong Yao,Gang Jin,Guozhe Sui,Jinlong Li,Dongxuan Guo,Shuang Liang,Ze Luo,Rongping Xu,Chao Wang,Jing Tang
Z-scheme photocatalytic heterojunction is considered as an effective strategy to promote the photogenerated electron-hole separation for improving the efficiency of photocatalytic hydrogen precipitation from splitting water significantly. Herein, a novel Z-scheme 2D-ZnIn 2 S 4 /NiCoP heterojunction is successfully prepared by coupling NiCoP derived from ZIF-67 through phosphating treatment with 2D-ZnIn 2 S 4 lamellae via a facile hydrothermal method . The Z-scheme heterostructure of ZnIn 2 S 4 /NiCoP could suppress the recombination-rate of photogenerated electron-hole pairs and enhance the visible-light-driven photocatalytic hydrogen production . As a result, the hydrogen production rate of 2D-ZnIn 2 S 4 /NiCoP (10 wt% ZnIn 2 S 4 ) increase to 5098.12 μmol g −1 h −1 significantly with an apparent quantum yield (AQY) of 5.24% at 420 nm, which is 3.07 times than that of bare ZnIn 2 S 4 . The enhancement of photocatalytic performance is attributed to the following issues: 2D-ZnIn 2 S 4 could avoid the agglomeration of tiny ZnIn 2 S 4 , exposing more active sites and shortening the transmission distance of photogenerated carries; the formation of Z-scheme heterostructure could promote the separation of photogenerated electron-hole pairs; the unique hollow structure of NiCoP derived from ZIF-67 could inhibit the recombination of the photogenerated electron-hole. Overall, this work could provide a new idea for designing and preparing of visible-light-driven photocatalysts with high efficiency for photocatalytic hydrogen production.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Junting Gao,Xidong Ma,Tiefeng Xu,Yan Gu,Xiufang Chen,Wenxing Chen,Wangyang Lu
Color, as an integral part of human life, enriches human material civilization and spiritual life. However, due to increasingly serious environmental pollution, the use of pigments is no longer limited to beautifying the environment, and their broader applications have also become the focus of research in recent years. Here, a simple one-step calcination method has been used to prepare new functional pigments by combining commercialized inorganic pigments with a novel g-C 3 N 4 photocatalyst. These functional pigments exhibit high photocatalytic activity against nicotine under simulated sunlight and even weak white light emitting diode (white-LED) irradiation, and the degree of removal reached almost 100 % in 105 min. The novel photocatalytic pigments were further appended on the surface of low melting point sheath-core composite polyester fibers (LMPET), and the obtained multicolored photocatalytic fibers displayed multiple functions for photocatalytic degradation of organic pollutants and antibacterial properties. Moreover, the prepared multicolored photocatalytic fibers could be recycled, and their catalytic performance was stable without significant reduction after ten cycles. The enhanced performance could be attributed to the expansion of the visible-light response range and the efficient separation of photogenerated electron–hole pairs. In addition, electron paramagnetic resonance analysis confirmed that •O 2 − and 1 O 2 , rather than •OH, are the main reactive species for the photocatalytic reaction, effectively avoiding the oxidative corrosion of textile substrates. These novel photocatalytic pigments show great potential in the fields of painting and decoration, not only being aesthetically pleasing, but also acting to purify the indoor environment.
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ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Xiaochun Liu,Jianyu Wu,Zilun Tang,Jianxin Wu,Zhiyi Huang,Xingshan Yin,Jiahao Du,Xiaofeng Lin,Wenjing Lin,Guobin Yi
Developing a shape memory polyurethane with high mechanical properties, excellent self-healing has become a huge challenge for the development of smart materials. Herein, we report the design and fabrication of a shape memory polyurethane network terminated with coumarin units (HEOMC-PU) to address this conundrum. The synthesized HEOMC-PU exhibits exceptional mechanical performance with a breaking elongation of 746% and toughness of 55.5 MJ·m–3. By utilizing the dynamically reversible behavior of coumarin units to repair the damaged network, the efficient self-healing performance (99.2%) of HEOMC-PU is obtained. In addition, the prepared network and light-induced dynamic reversibility endow the HEOMC-PU with both liquid-state remoldability and solid-state plasticity, respectively, enabling polyurethane to be recycled and processed multiple times. Furthermore, based on the fluorescence responsive characteristic of coumarin, HEOMC-PU with a fluorescent pattern can be deformed into specific three-dimensional configurations by combining photolithography, self-healing, and the shape memory effect. Such a multilevel and multidimensional anti-counterfeiting platform with rewritable fluorescent patterns and reconfigurable shapes can open up a new encryption approach for future intelligent anti-counterfeiting.
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PubMed
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ACS Applied Bio Materials
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2022
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IF 0
Tianxing Zhou,Shuangcong Xie,Chunze Zhou,Yiyu Chen,Hong Li,Ping Liu,Rongjian Jiang,Lifeng Hang,Guihua Jiang
Light-responsive nanocarrier-based drug delivery systems (NDDSs), due to their unique advantages such as safety, minimal cross-reaction, and spatiotemporal precision, have received wide attention. Notably, second near-infrared (NIR-II) light, which has a high penetration depth for manipulating NDDSs to release drugs, is in high demand. Herein, polyethylene glycol (PEG)-modified hollow CuxS nanoparticles (NPs) are developed as an all-in-one NIR-II light-responsive NDDS for synergistic chemo-photothermal therapy. First, CuxS-PEG NPs were prepared under mild conditions by using Cu2O NPs as sacrificial templates. The morphology, photothermal effect, drug loading/releasing abilities, and synergistic chemo-photothermal therapy of CuxS-PEG NPs have been investigated. The CuxS-PEG NPs with hollow structures showed a high drug loading capacity (∼255 μg Dox per mg of CuxS NPs) and stimuli-responsive drug release triggered by NIR-II laser irradiation. The synergistic chemo-photothermal therapy based on the Dox/CuxS-PEG NPs showed 98.5% tumor elimination. Our study emphasizes the great potential of CuxS-PEG NPs as an all-in-one NIR-II light-responsive NDDS for applications in biomedicine.
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PubMed
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2022
·Vol. 46
·期 12
·16979-16990
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IF 4.672
Jun Xiong,Zhihui Yang,Bo Wu,Ming Li,Xue Min
Summary Interface solar steam generation (ISSG) is a prospective and reliable option for producing freshwater from seawater and industrial wastewater. However, salts and heavy metal ions deposited on photothermal materials (PTMs) will diminish the evaporation rate. Besides, the low evaporation rate will limit the widespread application of ISSG devices. In this work, we exploited a washable CuS-enhanced light absorption PTM based on polydopamine-cotton fabric (PDA-CF), which is abbreviated as CuS-PDA-CF. On one hand, CuS-PDA-CF is washable and can be cleaned by hand or ultrasonic to remove the deposited salts and renew the photothermal performance. On the other hand, Due to the cooperative contribution of CuS and PDA, the light absorption capacity of CuS-PDA-CF is improved to 98.13%, acquiring a 1.50 kg m −2 h −1 water evaporation rate with a 94.49% photothermal efficiency at 1-solar (1 kW m −2 ) illumination. Outdoor experiments demonstrate that the solar vapor generator based on CuS-PDA-CF can extract freshwater from seawater and industrial wastewater. The cations elimination rate in seawater and industrial wastewater is higher than 99.9%. This work provides an achievable method to fabricate efficiency-enhanced and washable CF-based solar evaporators to relieve freshwater scarcity.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Xiangmei Xiang,Juanjuan Zhou,Shaochen Lin,Nan Zhang,Gulizhabaier Abulipizi,Guikui Chen,Zhanjun Li
Microplastics (MPs) can adsorb and influence the toxicity of traditional pollutants significantly. Although the complex toxicity of MPs and molecular pollutants were frequently reported, rare work has been done on the influence of MPs on the phototoxicity of photosensitive pollutants under light illumination condition. Herein, polystyrene microplastics (PS) (~1 μm in diameter, 5.0 mg/L) was used as a model MP to investigate its influence on the phototoxicity of a soluble blue dye, methylene blue (MB) using Daphnia magna as a model organism. The results indicate that PS could adsorb MB effectively and quickly, thus led to concentrated MB on PS/water interface. D. magna ingested MB-adsorbed PS very quickly within tens of minutes. Although MB or PS alone led to negligible lethal phototoxicity to D. magna , PS significantly enhanced the lethal phototoxicity of MB (0.25 mg/L) to D. magna after light illumination (10 h) with the survival rate decreased by 63.3 % compared with the control in the dark. Further, the phototoxicity of MB was found positively consistent with PS concentration from 0.50 mg/L to 7.50 mg/L. The singlet oxygen fluorescence assay indicates that the presence of PS did not increase the total amount of singlet oxygen in the aquatic environment but increased the local concentration in the gut area via non-selective ingestion of D. magna . High level singlet oxygen generated in the gut might possibly be the main reason that led to the massive death of D. magna . Surface adsorption of photosensitive pollutants may transform inert MPs into persistent solid sources of singlet oxygen production and become a new potential lethal threat to aquatic small organisms and ecological equilibrium. This kind of MPs and light dual drive phototoxicity of photosensitive pollutants needs to paid more attention in understanding the uncertain ecological risk of MPs.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Shangyuan Ni,Zhengrong Fu,Lin Li,Manying Ma,Yuelin Liu
Construction of heterojunction between semiconductors is considered an effective strategy for enhancing photocatalytic capability. Herein, this work prepared an abundant porous g-C 3 N 4 /TiO 2 photocatalyst , with the two-dimensional (2D) nanosheet g-C 3 N 4 and nanoparticle TiO 2 . The heterojunction both enhanced the ultraviolet (UV) light absorption ability, and inhibited the recombination of photogenerated electron-hole (h + ) pairs. As expected, the optimal 4 % g-C 3 N 4 /TiO 2 (g-C 3 N 4 :TiO 2 = 1:25) exhibited a prominent degradation efficiency of 96.53 % in the photocatalytic performance of tetracycline hydrochloride (TCH) under UV irradiation . The recycling of the heterojunction photocatalyst g-C 3 N 4 /TiO 2 remained stability and reusability. The main active species were·O 2- , h + and·OH, and the formation of internal electric field on the step-scheme (S-scheme) heterojunction interface accelerated the migration of photogenerated carriers. Moreover, several environmental factors on degradation such as dose, pH, and the initial concentration of TCH were investigated. This work could be spread to the conceive of other S-scheme heterojunction photocatalysts in application to different environmental demands.
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