Nano Energy
·
2020
·
IF 16.602
Xiaoming Mo,Tao Li,Fengchang Huang,Zhuxin Li,Yulu Zhou,Tao Lin,Yifang Ouyang,Xiaoma Tao,Caofeng Pan
Lead-based halide perovskites have received great research interest in producing exceptional optoelectronic devices owing to their superior photophysical properties. However, inclusion of toxic Pb in these perovskites brings great risk to public health and hinders their use. Here we report the use of copper(I) to fully substitute Pb to produce Pb-free one-dimensional (1D) CsCu 2 I 3 single crystals (SCs). High-quality, air stable, and yellow-emitting 1D CsCu 2 I 3 SC with length as long as 13 mm is synthesized via inverse temperature crystallization method. A record photoluminescence quantum yield (PLQY) first exceeding 50% (50.4%) is obtained with oleic acid as additive during growth. White light-emitting diodes produced by using the 1D CsCu 2 I 3 SC as yellow phosphors are strikingly capable of working continuously for more than 580 h with a half-lifetime of ~150 h in air. Photodetectors fabricated by the 1D CsCu 2 I 3 SC show distinct UV response with fast response time as low as 50.4 ms (at 340 nm). Our findings pave a way by using the copper(I)-based 1D CsCu 2 I 3 SCs for future high-efficiency solid-state lighting and fast UV photodetection applications.
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CHEMOSPHERE
·
2020
·
IF 5.778
Pin Wang,Lingjun Bu,Yangtao Wu,Wangchi Ma,Shumin Zhu,Shiqing Zhou
The study investigated the degradation kinetic and transformation mechanism of ibuprofen (IBP) in UV/H 2 O 2 process from both experimental and theoretical aspects. Impacts of H 2 O 2 dosage, solution pH, quenching agent, and concentration of nitrite (NO 2 − ) on IBP degradation in UV/H 2 O 2 process were evaluated. Both experimental results and theoretical calculations indicated that • OH played an important role in the degradation of IBP and its transformation products . The second-order rate constants of • OH and • NO 2 with IBP were calculated as 3.93 × 10 9 M −1 s −1 and 5.59 × 10 −3 M −1 s −1 , based on the transition state theory, which explained the phenomenon that addition of NO 2 − inhibited IBP degradation. Further, according to the results of ultra-high-resolution mass and density functional theory calculations, mechanisms of a detailed degradation pathway for IBP were clarified. Namely, the detailed mechanistic formation pathways for hydroxylated and keto-based products were proposed. Then, possible active sites of the keto-based products, as well as the corresponding subsequent products were predicted by Condensed Fukui Function. Our study can broaden the knowledge of the reactions of emerging contaminants with • OH, and provide theoretical foundation for the optimization of UV/H 2 O 2 process.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Zechang Wei,Chenyang Cai,Yangze Huang,Pei Wang,Jianyue Song,Leixin Deng,Yu Fu
It has been a huge challenge to obtain simultaneously excellent mechanical strength and desirable multifunctionality from the cellulose nanocrystals (CNC) based food packing materials. In this work, we demonstrated a hydrogen bonding tailoring strategy that can produce CNC/lignin films with UV blocking and antioxidant activity , while bypassing the loss of mechanical strength. Using a hyperbranched polyester, lignin was first functionalized to increase the amount of hydroxyl groups, thereby increasing the intermolecular interactions. By assembling the polyester modified lignin (H-lignin) into CNC matrix, the hydrogen bonding crosslinks between the H-lignin and CNC chains were successfully promoted, resulting in the CNC composites with the significantly improved mechanical strength, UV blocking and antioxidant activity. The phenolic structure and the hydrogen donation of H-lignin also endowed the resulting CNC composites with excellent UV blocking and antioxidant activity. The experimental results indicated that the H-lignin could bring about 34% and 63% increase in tensile strength and Young's modulus , respectively, higher than the reported ones. The CNC-based composites showed better thermal stability and improved crystallinity property. The H-lignin provides a new insight into the multifunctional exploration of CNC-based composite. This work opens a new avenue for the next generation's biodegradable food packing materials from cellulose-sourced composites.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Xiao Chang,Xurong Qiao,Kun Li,Ping Wang,Ya Xiong,Xiaofang Li,Fujun Xia,Qingzhong Xue
It is challenging for current metal oxides based acetone sensors to realize excellent ppb-level acetone sensing properties at low working temperature. Herein, the hollow ZnO/MoS 2 nanosheets (HZnO/MoS 2 ) core/shell heterogeneous structures are originally produced. Fast gas transport channels and n–p heterojunctions are produced by the decoration of MoS 2 nanosheets on HZnO surface, resulting in high acetone response and fast response/recovery speed. Ultraviolet (UV) light is introduced to further improve acetone response and drastically reduce working temperature. The light diffraction and reflection caused by the decoration of hierarchical MoS 2 nanosheets could significantly enhance light harvesting. Hence, the excellent acetone sensing properties are obtained by the synergistic effect of UV light and HZnO/MoS 2 core/shell heterogeneous structures. Exactly, at 100 °C, the HZnO/MoS 2 possesses a stable response (1.52) to 100 ppb acetone with UV irradiation while it exhibits no response to 100 ppb acetone without UV. Even at room temperature (30 ℃), UV activated HZnO/MoS 2 still exhibits a stable response (∼1.33) and fast recovery/recovery time (19 s/97 s) to 50 ppm acetone. Furthermore, the DFT calculations are performed to demonstrate the underlying acetone sensing mechanism. The results demonstrate that UV activated HZnO/MoS 2 heterostructure could achieve trace-acetone detection at low temperature.
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Food & Function
·
2020
·Vol. 11
·期 4
·3563-3573
·
IF 4.171
Xing Zhang,Hui He,Tao Hou
Selenium-biofortified crops are a quality functional food resource because of their anti-tumor and anti-cancer properties. In the present study, the conjugates of selenium-biofortified soybean protein and polyphenols were prepared and evaluated by alkali-induced synthesis and in vitro antioxidant tests. Moreover, the antioxidant mechanisms of protecting mice skin damaged by UV-B were studied. The results showed that the antioxidant activity of the conjugate between 7S globulin from selenium-enriched soybean (Se-7S) and EGCG (Se-7S-EGCG) was significantly higher (P < 0.05) than that of Se-7S-GA. Structural characterizations implied that the polymerization of polyphenols with amino acid residues occurred. Se-7S-EGCG inhibited the apoptosis of epidermal cells induced by UV-B. The overexpression of phosphorylated proteins in the MAPK signaling pathway, the activation of related inflammatory factors, and the boost in the MMPs were reversed by Se-7S-EGCG. Overall, this research provides a theoretical and experimental basis for the application of protein and polyphenol conjugates in food and medicine fields.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 17
·6992-7000
·
IF 3.288
Tehseen Nawaz,Muhammad Ahmad,Jieying Yu,Shiqi Wang,Tianxin Wei
Novel bifunctional group monomer itaconic acid (IA) based molecularly imprinted polymers (MIPs) were successfully prepared with hydrogen bonding interactions by applying a facile combination of a reversible addition chain transfer mechanism (RAFT) and surface plasmon resonance (SPR). UV photo-polymerization in synergy with 2-methyl-2-[(dodecylsulfanylthiocarbonyl)sulfanyl]propanoic acid (TTCA) as a chain transfer reagent was employed for MIP film synthesis on an SPR sensor chip for the detection of progesterone using ethylene glycol dimethacrylate (EGDMA) as a cross linker. In addition, the ratio of template to bifunctional group monomer to cross linker was optimized (1 : 2 : 12) by real-time SPR monitoring. The modified surface of the biosensor was characterized by contact angle measurements, frontier transfer infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The resulting itaconic acid based MIP (IA based MIP) biosensor showed a high adsorption capacity and excellent selectivity in comparison to other analogues and non-imprinted polymer (NIP) film. Through 8 adsorption–desorption cycles, the high recoverability of IA based MIP film was confirmed. These features suggested that IA based MIPs are ideal candidates for biosensor use owing to the bifunctionality of the monomer. Consequently, within the concentration range of 1 × 10−18 to 1 × 10−8 mol L−1, the coupling angle change of SPR versus the negative logarithm of concentration showed excellent linearity: R2 = 0.99. Based on a linear equation, IA based MIPs showed excellent values for the limit of detection (LOD) and limit of quantification (LOQ), i.e. 0.28 × 10−19 mol L−1 and 0.92 × 10−19 mol L−1, respectively. Furthermore, the influence of the matrix on the biosensor was successfully analyzed in real samples with satisfactory outcomes, displaying identical behavior to ideal samples. Hence, IA based MIPs in combination with an SPR sensor chip demonstrated potential applications for rapid and highly effective sensing even in complicated matrices.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Lijian Sun,Jing Shen,Xianhui An,Xueren Qian
It is still a challenge to realize super clear cellulose-based film materials with different functional combinations. This study presents a novel concept of fabricating flame-retardant, mechanically strong, UV and blue light double-blocking carboxymethylated cellulose-based nanocomposite bioplastics enabled by nano-metal organic framework (MIL-125(Ti)-NH 2 ). Carboxymethylated cellulose gel with porous structure acts as nanoreactor and carboxyl groups as reactive sites to facilitate the growth and anchorage of nano-MIL-125(Ti)-NH 2 . Super clear bioplastics were obtained through hot-pressing. The results show that the neat carboxymethylated cellulose bioplastic possesses high transmittance (94.1% at 600 nm) and low haze (2.0% at 600 nm). The incorporation of nano-MIL-125(Ti)-NH 2 enabled nanocomposite bioplastics to obtain UV and blue light double-shielding capability meanwhile retaining high transmittance (79–92.8%) and low haze (2.6–7.2%). Moreover, the incorporation of nano-MIL-125(Ti)-NH 2 was found to significantly improve the mechanical strength and decrease the flammability of nanocomposite bioplastics. This facile strategy would direct nanocomposite bioplastics toward diversified applications.
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FIBERS AND POLYMERS
·
2021
·Vol. 23
·期 2
·386-395
·
IF 2.153
Xu Qingbo,Wang Peng,Zhang Yanyan,Li Changlong
k]Immobilizing inorganic particles such as zinc oxide (ZnO), titanium dioxide (TiO 2 ), silver nanoparticles (Ag NPs) or grafting special biopolymer such as chitosan on cotton fabrics is the main method to prepare antibacterial and ultraviolet (UV) protective cotton fabrics. However, poor durability and complex finishing methods are still of the main defects of antibacterial and UV protective fabric samples. In the present work, the Ag/TiO 2 colloid solution was prepared with using the carboxymethyl chitosan (CMC) as a stabilizer, then the CMC and Ag/TiO 2 composite nanoparticles were coated on the fabric via finishing technology of pad-dry-cure. As a result, the modified fabric showed excellent antibacterial and UV protective properties, with the values of bacterial reduction (BR) and ultraviolet protection factor were reached at 99.5 % and 79.0, respectively. Moreover, even after 50 washing cycles, these properties of the finished fabrics were not obviously reduced. These results demonstrated that the finished fabric sample has durable antibacterial and UV protective properties which could has a great potential application in the field of medical and outdoor apparel.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Yingxue Wu,Xianhong Zhang,Dong Chen,Yuhong Ma,Qin Wang,Jiadong Wang,Wantai Yang
Branched polyacrylamides (PAMs) have shown tremendous potential in wastewater treatment, papermaking, and oil drilling due to their unique molecular structure, remarkable shear stability, and effective flocculability. Efficient approaches for their industrial-scale production have attracted increasing attention. Herein, we report a facile, scalable, highly efficient, and cost-effective strategy for the production of branched PAMs through UV polymerization of acrylamide (AM) initiated with a novel water-soluble macro-photoinitiator. Through precipitation copolymerization of AM and 2-hydroxy-1-[4-(2-acryloyloxyethoxy)phenyl]-2-methyl-1-propanone (M2959), poly(AM-co-M2959)s bearing photoinitiator moieties on the backbone were successfully synthesized, which showed excellent water solubility and high photoinitiation efficiency. Most importantly, both the branching degree and main-chain length of the branched PAMs were controllable, given that the molar mass and photoinitiating group content of poly(AM-co-M2959)s could be effectively controlled by adjusting the monomer feed ratio of AM/M2959. The rheological properties of the resultant branched PAMs were characterized in detail, and excellent water solubility and shear resistance were observed, confirming the well-defined branched structure of the as-prepared PAMs. Due to their facile synthesis, simplicity of operation, and high photoinitiation efficiency, these novel macro-photoinitiators have great potential as a versatile platform for the preparation of various branched polymers containing different functional groups (not limited to branched PAMs).
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LANGMUIR
·
2021
·
IF 3.882
Dahai Zhang,Qianhao Pan,Minghao Jia,Xiaogang Zhang,Yapei Wang
As the most frequently used archival materials for painting and recording, paper lays the groundwork for the development of prosperous human civilization. However, its susceptibility to three primary factors including external ultraviolet light, increased acidity, and biological pathogens in long-term storage shortens the longevity of paper. Therefore, the protection of paper-based cultural relics is extremely urgent. Inspired by the three adverse factors affecting the protection of cultural relics, we herein propose to combine the ultraviolet absorber 2-hydroxy-4-(octyloxy)benzophenone (UV-531) and alkaline zinc oxide (ZnO) nanoparticles innovatively into the antibacterial agent polyhexamethylene biguanidine hydrochloride (PHMB) to realize the strategy of three birds with one stone for relics protection. This study illustrates that the tensile strength and the folding endurance of different test papers are guaranteed by coating them with the composite reagents, and molds including Mucor, Trichoderma, and Aspergillus niger are effectually sterilized. In addition, a hand-painted Chinese ink-wash painting with beautiful flowers is chosen as the object for simulating cultural relics protection, and negligible color fading is observed in aging experiments. From the perspective of effectiveness, simplicity, and economy, this strategy sheds light on preservative protection of paper-based relics in long-term storage.
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ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 30
·期 5
·1907650
·
IF 15.621
Yong Zhang,Xiaoyue Zhao,Jiaxin Chen,Siyuan Li,Wei Yang,Xiaosheng Fang
ZnO film ultraviolet photodetectors (UV PDs) have always suffered from slow speed and low photosensitivity that restrict their broader applications. To break through those barriers, high-performance ZnO UV PD based on self-polarized BaTiO 3 (BTO) is first introduced through a facile one-step spin-coating method. Compared with pure ZnO film UV PD with low on/off ratio (65) and slow speed (4.1/7.5 s) at 3 V bias under 350 nm UV light, the BTO-ZnO bilayer film device exhibits an ultrahigh on/off ratio (14 300) and ultrafast response speed (0.11/5.80 ms), which is much faster than that of the most reported ZnO film-based UV PDs. The numerical simulation demonstrates that the spatial distribution of electron concentration of ZnO film is regulated by the self-polarization of BTO film, resulting in low dark current and fast response time of the BTO-ZnO PD. This work provides a new approach to fabricate high-performance PDs based on self-polarized ferroelectric materials.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Cong Geng,Zhijie Liang,Fuyi Cui,Zhiwei Zhao,Chen Yuan,Jinying Du,Chuang Wang
Due to the inefficient treatment by the biotic and UV-disinfection processes in wastewater treatment plants, the broad-spectrum Fluoroquinolone antibiotics (FQs) are frequently detected in water environment around the world. In this work, the photo-degradation of three FQs (norfloxacin-NOR, ciprofloxacin-CIP, levofloxacin-LEV) by VUV/UV irradiation was investigated. The results showed that the degradation of FQs in VUV/UV irradiation system were more effective than that in UV irradiation system by enhanced the defluorination and decarboxylation . FQs could be degraded more efficiently with high temperature and low initial concentration, and the effect of flow rate was small. Initial pH played a key role in degradation of NOR and CIP. Most anions could slightly affect the FQs removal in water, except the carbonate and phosphate species. 1 O 2 and ·OH played the primary role in FQs degradation in VUV/UV system. Defluorination, decarboxylation, and piperazine ring oxidation were the main degradation pathways for three FQs degradation, but demethylation was a particular degradation pathway of LEV. Antibacterial activities of FQs aqueous sample were reduced in both VUV/UV and UV system, while the removal of antibacterial activities in the VUV/UV process were more efficient than UV process for NOR and LEV. VUV/UV system was more energy-saving for removing FQs. These results suggested that VUV/UV system is potential alternative in replacing or enhancing UV system in wastewater treatment plants for FQs removal in the future.
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