INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Koucheng Chen,Heng Zhang,Hui Tong,Ling Wang,Lu Tao,Ke Wang,Yinxi Zhang,Xingfu Zhou
Ce-doped TiO 2 nanorod arrays as the mesoporous supporting layer and TiO 2 compacted electron blocking layer was simultaneously fabricated by one-pot hydrothermal method . Ce-doped TiO 2 nanorod was utilized as down-conversion luminescence centers and commercial available carbon was used in hole-transport-free perovskite solar cells . SEM indicated that the doping of Ce reduced the diameter of TiO 2 nanorods. XRD and EDS spectra demonstrate the successful incorporation of Ce ions. UV–Vis absorption spectra and PL emission spectra show that the down-conversion center Ce 4+ can effectively utilize ultraviolet light and extend the absorption into the ultraviolet region. The carbon-based device using the optimized Ce doping concentration achieved power conversion efficiency (PCE) of 10.1%, which was 24.6% higher than that of undoped device. Ce doping changes the band gap of TiO 2 and the Fermi energy level, and thus improve the open circuit voltage. The open circuit voltage decay curve show that Ce-doped TiO 2 prolongs electron lifetime . EIS analysis hints that more carriers are generated. The UV stability has also been significantly improved., PCE of the optimized Ce-doped device still retains 90% of the initial value , however, the undoped device decreases to 55% of the initial value under light irradiation at ambient atmosphere for 12 h.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jinyuan Zhang,Tian Shi,Tong Liu,Fuhua Gao,Da Cai,Pingwei Liu,Shenghong Yang,Yueli zhang
Combining upconversion materials with narrow-wide bandgap semiconductors to construct heterostructured composite photocatalysts effectively improves solar energy conversion efficiency. NYF:Ln 3+ (Ln = Yb,Er,Tm)@BiOX(X = Cl,Br,I) heterostructures were prepared by a two-step hydrothermal method. This work explores the effects of different lanthanide ion doping and narrow-wide bandgap bismuth oxyhalides on the performance of the heterostructures system. Under near-infrared (NIR) light irradiation, NYF:Yb,Er,Tm@BiOI degraded 94 % BPA within 160 min. Significantly, compared with NYF:Yb,Er@BiOCl, NYF:Yb,Er@BiOBr and the NYF:Yb,Er,Tm/BiOI mechanical mixtures, the photocatalytic activity of NYF:Yb,Er,Tm@BiOI was increased by 9.4 times, 3.7 times and 1.8 times, respectively. The enhanced photocatalytic activity is attributed to the doping of Er-Tm double-activated ions, which provides multiple upconversion emissions and forms more overlap in the narrow bandgap BiOI absorption spectrum, making it advantageous to utilize upconversion light fully. Eventually, an underlying mechanism was proposed that the existence of FRET in the NYF:Yb,Er,Tm@BiOI heterostructure leads to enhanced photocatalytic activity. This work provides new insights into the design of advanced structures for NIR-responsive photocatalysts.
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高影响因子
Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Deshun Huang,Guozong Yue,Jing Zhu,Feiyi Liao,Yihong Zhao,Luming Yang
With the urgent need for oil/organic solvents spills disposal, the development of new sorbents with low cost, high sorption capacity, good selectivity and reusability is required. In the current work, three-dimensional structured absorbents have been rapidly fabricated by ultraviolet (UV)-crosslinking of styrene- block -butadiene- block -styrene (SBS) copolymers via thiol-ene reaction in 60 s, using poly-(mercaptopropyl)methylsiloxane (SMS) as crosslinker. The SBS-SMS absorbents were characterized by FT-IR, SEM, XRD, tensile strength, thermogravimetric, gel fraction and water contact angle analysis, which showed high tensile strength, good thermal stability, hydrophobicity, and acceptable gel content. The absorption capacity investigations were carried out in 7 types of organic liquids and 2 types of oils. The SBS-SMS 0.005 exhibited the highest absorption performance in different organics, with the capacities of 74.6 g/g for dichloromethane, 20.1 g/g for kerosene, and 12.8 g/g for diesel oil, respectively. The impacts of sheet thickness on the absorption and desorption kinetics were studied, and the results showed that thinner absorbents illustrated faster absorption and desorption speed. Additionally, the SBS-SMS absorbents showed good selectivity and effectiveness in organic solvents/oil separation from water (separation efficiency > 93 %), well oil retention ability and oil desorption efficiency, floating properties, easy collection, as well as good reusability upon ten absorption-desorption cycles. The current SBS-SMS absorbents should have great potential in practical application for efficient oil/water separation as well as radioactive organic waste liquid treatment.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
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IF 4.539
Chunyan Zhang,Zhendong Fu,Feng Hong,Ge Pang,Tengri Dong,Yunxiao Zhang,Guixia Liu,Xiangting Dong,Jinxian Wang
Broad spectrum response photocatalyst is crucial for making full use of sunlight and widely used in efficient photocatalytic degradation of organic dyes. In this work, upconversion luminescence boosted broadband photocatalysts based on BiF 3 :Yb 3+ , Er 3+ nanoparticles (BFY) and the carbon nitride doped with various masses of barbituric acid (CNB x ) semiconductor materials (BFY/CNB x ) were successfully designed and produced for photocatalysis in UV–Vis–NIR region. Compared with pure g-C 3 N 4 , BFY/CNB 0.5 composites have better photocatalytic performance attributed to the utilization of broadband spectrum energy and effective charge separation. After 30 min illumination by visible light , photodegradation efficiency of RhB reaches about 99.4% by using BFY-2/CNB 0.5 . A plot of C/C 0 versus time indicates that the BFY-2/CNB 0.5 can degrade about 64.7% of RhB in 80 min by NIR irradiation. Under simulated solar light, the sample of BFY-2/CNB 0.5 reaches a maximum degradation efficiency of 98.0% within 15 min. The strengthened photocatalytic activity is due to the synergistic effect of CNB 0.5 and upconversion materials. The active species utilized in the degradation process were examined using capture experiments. After four continuous photocatalytic cycles, about 94.0% of RhB solution is degraded. The photocatalytic mechanism of the composite photocatalysts is also analyzed in detail. The results indicate that the prepared BFY/CNB 0.5 photocatalysts have good prospects in the field of environmental remediation.
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高影响因子
Environmental Science-Advances
·
2022
·Vol. 2
·期 1
·98-106
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IF 0
Jingzhen Zhang,Qian Zheng,Chen Chen,Xiangcheng Zhang,Xiaoyan Guo,Mingce Long
A self-maintainable decentralized water treatment system is appealing, while avoiding chemical addition is the prerequisite to realize it. As a widely used chemical in advanced oxidation processes (AOPs), H2O2 can be produced via photocatalysis. However, there remain challenges to use the photocatalytically produced H2O2 for water purification in a continuous operation, which requires that the produced H2O2 solution has no impurity and the catalyst powder is easily separable. We realized this by photocatalytic H2O2 production over magnetic separable photocatalytic microspheres through a sequencing batch process and coupling with ultraviolet C (UVC)/H2O2 for micropollutant removal via a flow-through operation. The photocatalysts were synthesized by in situ growth of a resorcinol–formaldehyde (RF) copolymer on Fe3O4@SiO2 microspheres, which can convert earth-abundant water and air into H2O2 under visible light irradiation. A clean H2O2 solution was produced at 100 μmol h−1 g−1 over magnetic photocatalysts and separated by using an external magnetic field. The on-site utilization of the obtained H2O2 solution was realized via UV light irradiation. This work provides a rational design of easily separable photocatalysts for H2O2 production, and offers insights for development of water purification processes with zero chemical addition and maintenance.
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JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
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2024
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IF 3.6
Jianhao Cheng,Chen Shi,Yubing Dong,Jian Han
Ultraviolet (UV) radiation has a detrimental effect on the outdoor lifetime of PVC film materials. TiO2 nanoparticles, as commonly used UV absorbers, still suffer from poor transparency, high photocatalytic effect, and poor dispersion in PVC matrix. To mitigate these effects effectively, titanium dioxide nanorod @ silicon dioxide (TNr@SiO2) was synthesized and used as an anti-UV aging agent for polyvinyl chloride (PVC). The agglomeration effects of TiO2 nanoparticles in PVC films were solved by synthesizing TNr, and the catalytic effects of TiO2 was reduced by growing SiO2 on the TNr surface. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and UV-visible spectroscopy were utilized to demonstrate the excellent dispersion and low photocatalytic effects of the synthesized TNr@SiO2. Compared with pure PVC film, the color change of TNr@SiO2/PVC composite film is not evident after 800h of UV aging, and the retention of mechanical properties were 93.94%. Compared with TiO2/PVC, TNr@SiO2/PVC composite film has better transparency. Results show that TNr@SiO2 can maintain the properties of PVC better because the electrons of TNr@SiO2 are excited to form a positively charged hole after the absorption of UV light, and then the hole electron pairs are recombined and converted into thermal energy, which improves the durability of PVC. Therefore, this highly transparent TNr@SiO2/PVC composite film with low photocatalytic activity and high UV resistance will soon be applied in large-scale industrial production.
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高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Yueming Yu,Yan Zhang,Liangdong Xi,Zhinuo Zhao,Siqi Huo,Guobo Huang,Zhengping Fang,Pingan Song
In this work, we found a very effective method to adjust the polarity of the fillers to promote its good dispersion in matrix by using an organic-solvent-free assembling strategy. With the coating of polyethylenimine-decorated graphene oxide (GO-PEI), the as-prepared biobased core-shell graphene oxide hybrid (BCSGOH) can distribute more homogeneously in the polylactide (PLA) matrix, compared with the bio-derived core-shell flame retardant (CSFR) with higher polarity. The polarity analysis of BCSGOH, CSFR and PLA indicated that the polarity of BCSGOH had a better match with that of PLA, and the interfacial tension (0.8 mN/m) between BCSGOH and PLA was much lower than that (12.0 mN/m) between CSFR and PLA. Consequently, the better flame retardancy, impact toughness and UV-shielding properties of PLA/BCSGOH composites were achieved. 6 wt% of BCSGOH endowed PLA with the best comprehensive properties, such as the UL94 V-0 rating, the limiting oxygen index (LOI) of 30.0%, and notched impact strength of 12.38 kJ/m 2 . Hence, this work offers a conducive, facile and green strategy to create high-performance fire-safe bioplastics .
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Kunlin Chen,Weiwei Gou,Xuemei Wang,Chanjuan Zeng,Fangqing Ge,Zhenjiang Dong,Chaoxia Wang
Design and fabrication of smart surfaces for separation of oily water have been developed rapidly. Nevertheless, construction of these smart surface materials by using green and sustainable paths for intelligent separation of oily water still faces huge challenges. The aim of this study was to develop a facile, sustainable, and energy-efficient approach for the fabrication of smart coatings with pH-responsive switchable wettability. The coating was formed on the textiles from UV-cured fluoride-free pH-responsive polyurethane (pH-PU). The wettability of obtained textiles could switch reversibly between superhydrophobicity and underwater superoleophobicity due to the protonation and deprotonation of the pH-PU under different pH conditions, which was used to successfully separate either oil or water from oily water with high separation efficiencies. More importantly, oil-in-water and water-in-oil emulsions could all be selectively separated with high water flux and oil purity by as-fabricated textiles, and these pH-PU-functionalized textiles or sponges effectively performed for oil collection of oil spilled on water. Our work provided a fast, economical, and sustainable pathway to prepare smart coatings with switchable wettability for both environmental protection and energy-saving merits.
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高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Ziying Wang,Yisheng Shao,Naiyun Gao,Xian Lu,Na An
Degradation of diethyl phthalate (DEP) by ultraviolet/persulfate (UV/PS) process at different reaction conditions was evaluated. DEP can be degraded effectively via this process. Both tert-butyl (TBA) and methanol (MeOH) inhibited the degradation of DEP with MeOH having a stronger impact than TBA, suggesting sulfate radical ( ) and hydroxyl radical (HO ) both existed in the reaction systems studied. The second-order rate constants of DEP reacting with and HO were calculated to be ( 6.4 ± 0.3 ) × 10 7 M −1 s −1 and ( 3.7 ± 0.1 ) × 10 9 M −1 s −1 , respectively. To further access the potential degradation mechanism in this system, the pseudo-first-order rate constants (k o ) and the radical contributions were modeled using a simple steady-state kinetic model involving and HO . Generally, HO had a greater contribution to DEP degradation than . The k o of DEP increased as PS dosages increased when PS dosages were below 1.9 mM. However, it decreased with increasing initial DEP concentrations, which might be due to the radical scavenging effect of DEP. The k o values in acidic conditions were higher than those in alkaline solutions, which was probably caused by the increasing concentration of hydrogen phosphate (with higher scavenging effects than dihydrogen phosphate) from the phosphate buffer as pH values rose. Natural organic matter and bicarbonate dramatically suppressed the degradation of DEP by scavenging and HO . Additionally, the presence of chloride ion (Cl − ) promoted the degradation of DEP at low Cl − concentrations (0.25–1 mM). Finally, the proposed degradation pathways were illustrated.
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高影响因子
MATERIALS TECHNOLOGY
·
2016
·
IF 1.442
G. X. Chen,Y. Y. Chen,Y. Y. Cui,Q. F. Chen,T. Chen,Y. Yang
To meet an increasing market demand of conductive ink which is applicable to wide range of substrates, ultraviolet (UV) curing technique combined with nano-silver materials was used to fabricate UV electric conductive ink. Firstly, both silver nano-particles (AgNPs) and silver nano-wires (AgNWs)/poly (vinyl pyrrolidone) (PVP) composites were synthesized. An ethanol solution-phase approach using hydrazine hydrate as a reducing agent was presented for an easy synthesis of large-scale AgNPs with an average diameter of 35 nm. AgNWs with diameter of 40 nm and length up to over 10 μm were synthesized by polyol method. In AgNWs synthesis process, the main influencing factors such as the molar ratio of PVP to silver nitrate, the reaction time and PVP of different degree of polymerization were investigated. Finally, nano Ag/PVP composites, polyurethane acrylate, photoinitiator 1173 and solvents were used to fabricate UV electric conductive ink, which had an electrical conductivity on paper as high as 2.1 × 105 S/m.
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高影响因子
Heliyon
·
2023
·
IF 4
Hengyi Yu,Dongyan Li,Dong Xiang,Xiping Li,Lu Liu,Dong Liu,Xuepeng Gong
A rapid, specific and accurate high-performance liquid chromatography with tunable ultraviolet detection method was developed to simultaneously determine azathioprine metabolites, 6-thioguanine nucleotides (6-TGN) and 6-methyl mercaptopurine riboside (6-MMPr) in human red blood cells. Erythrocyte lysate sample was precipitated by perchloric acid under the protection of dithiothreitol, with 6-TGN and 6-MMPr being acid hydrolyzed to produce 6-thioguanine (6-TG) and 6-methymercaptopurine (6-MMP). A Waters Cortecs C 18 column (2.1 × 150 mm, 2.7 μm) was used for chromatographic separation with a water (containing 0.01 mol/L ammonium acetate and 0.2% acetic acid)/methanol linear gradient at a flow rate of 0.45 mL/min in a 5.5 min. UV detection wavelengths were 340 nm for 6-TG, 303 nm for 6-MMP and the IS (5-bromouracil). The calibration curves fitted a least squares model (weighed 1/ x 2 ) from 0.15 to 15 μmol/L for 6-TG ( r 2 = 0.9999) and from 1 to 100 μmol/L for 6-MMP ( r 2 = 0.9998). This method was validated according to the FDA bioanalytical method validation guidance and ICH M10 bioanalytical method validation and study sample analysis guidance for industry, and successfully utilized in ten IBD patients receiving azathioprine therapy.
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PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2017
·
IF 2.858
Hongping Xiang,Xiaowei Wang,Lu Xi,Haihui Dong,Peng Hong,Jiahui Su,Yanyan Cui,Xiaoxuan Liu
A series of UV-curable flexible hyperbranched polyurethane acrylate (F-HBPUA) with various generation numbers and soft chains are successfully developed by modifying different generations of hydroxyl terminated hyperbranched polyurethane (HBPU-OH) with diverse soft chains contained semiadduct urethane monoacrylate. The influence of generation number and soft chain on the performances of F-HBPUA and its UV-cured freestanding film is studied. The degree of branching of F-HBPUA from the second to the fifth generation is proved to be 0.74, 0.79, 0.82 and 0.94, respectively. The glass transition temperature of F-HBPUA increases with increasing generation number but it decreases with the increase of soft chain length. The thermal stability of F-HBPUA improveswith higher generations while the longer soft chain is only beneficial to the heat resistance at below 300 °C. As the increase of generation number and chain length, the UV-curing time of F-HBPUA film is significantly shortened from 12 s to 3 s, the flexibility of the UV-cured film is greatly increased from 4 mm to 1 mm, adhesion is improved to 3 grades. This novel flexible hyperbranched polyurethane acrylates can be applied to coatings, membranes and 3D print parts with excellent flexibility.
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高影响因子
危险品化学品经营许可证（带存储）