Journal of Environmental Sciences
·
2022
·
IF 6.796
Tian-Yang Zhang,Yong-Shan Lu,Zhen-Ning Luo,Wen-Jun Sun,Bin Xu,Chen-Yan Hu,Yu-Lin Tang,Zheng-Yu Dong,Xiao-Meng Ren
UV/peroxymonosulfate (UV/PMS) advanced oxidation process has attracted significant attention for removal of micropollutants in water. However, during practical water treatment applications, the PMS treatment must be performed before the UV treatment to achieve full contact. In this study, sulfamethoxazole (SMX) was selected as the target micropollutant. Four different operational approaches, including UV alone, PMS alone, simultaneous UV/PMS and sequential PMS-UV, were compared for their differences in SMX removal and disinfection by-product (DBP) formation potentials during chlorine-driven disinfection. Among the four approaches, UV/PMS and PMS-UV achieved over 90% removal efficiencies for SMX without substantial differences. For raw water, the trichloronitromethane (TCNM) formation potential after treatment with PMS-UV was lower than that after UV/PMS treatment. The time interval over which the PMS-UV process was conducted had little effect on the final removal efficiency for SMX. However, a brief (5 min) pre-PMS treatment significantly reduced the TCNM formation potential and the genotoxicity from DBPs. The formation risk for TCNM during chlorination increased markedly with increasing PMS dosages, and the appropriate dosage under these experimental conditions was suggested to be 0.5–1.0 mmol/L. Under alkaline conditions, PMS-UV treatment can enhance SMX degradation as well as dramatically reduced the formation potentials for haloketones, haloacetonitriles and halonitromethanes. This study suggests that proper optimization of UV/PMS processes can remove SMX and reduce its DBP formation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 4
·2525-2537
·
IF 6.123
Liang Chunliu,Zang Limin,Shi Fangfang,Yang Chao,Qiu Jianhui,Liu Qifan,Chen Zhenming
Cotton fabric (CF) fabricated by natural cellulose fibers has porous structure, abundant hydrophilic hydroxyl groups and good mechanical flexibility, which is a promising substrate for flexible fabric-based supercapacitors. Graphene oxide (GO) nanosheets were fixed on the CF by vacuum filtration, and then the pyrrole monomers and silver ions (Ag + ) were adsorbed to the surface of GO/CF by π-π and electrostatic interactions, respectively. Polypyrrole/silver (PPy/Ag) nanoparticles were generated on the surface of GO/CF via in situ UV-induced polymerization, forming the flexible PPy/Ag/GO/CF electrodes. The electrodes combine three active materials (PPy, Ag and GO), which show good electrochemical performance. The electrode prepared under optimum conditions (UV irradiation time: 120 min; mass loading of GO on the CF: 3 mg cm −2 ) exhibits a high specific capacitance of 1664.0 mF cm −2 . The flexible symmetric quasi-solid-state fabric-based supercapacitor (QFSC) based on the optimum electrode also keeps superior electrochemical performance and excellent mechanical flexibility, which has a great application prospect for wearable energy storage devices.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Yuan Deng,Kai Li,Qingqing Guan,Tianding Hu,Liang He
The improvement of the photothermal stability and mechanical properties for cellulose nanofibers (CNFs) is a highly desirable yet challenging research topic due to its wide applications. Featuring the 2D-organized structure and various characteristics, layered double hydroxides (LDHs) shows tremendous potential in improving the photothermal stability and mechanical properties of CNFs matrix. Herein, a series of ZnAl-LDHs nanosheets intercalated with different organic molecules were synthesized and subsequently doped into CNFs matrix for preparing CNFs/LDHs composited films. It was showed that doping UV-adsorber intercalated ZnAl-LDHs into the CNFs matrix can significantly enhance UV-shielding ability of CNFs/LDHs composited films due to the synergistic effect between organic anions and the interaction between organic anions and metal cations in LDHs laminates. And the CNFs/HUL (HUL = HALS/UV-P-LDHs) composited film exhibited outstanding UV-shielding ability (UV-shielding rate > 60%) among the considered films, which is comparable to that of the reported materials. Compared with the pristine CNFs film, compositing with HUL rendered the increasing of tensile strength from 80 to 110 MPa. The superior photothermal stability and mechanical properties of CNFs/HUL composited film highlight its great application potential in the fields of coating and packaging.
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Water Research & Technology
·
2022
·Vol. 8
·期 3
·586-596
·
IF 5.819
Zhiquan Li,Congwei Luo,Fengxun Tan,Daoji Wu,Xuedong Zhai,Shishun Wang,Xiaoxiang Cheng,Fumiao Zhang,Mingli Li,Qiao Ma
As an endocrine disruptor, bisphenol A (BPA) is a severe threat to human health. In this study, nitrate (NO3−) photolysis with a low-pressure UV lamp (LP-UV) was employed to degrade BPA in different aqueous solutions. Results showed that BPA could be decomposed efficiently in the UV/NO3− process. Moreover, the contributions of UV irradiation (4.1%), ˙OH (52.7%), and reactive nitrogen species (43.2%) were obtained. The observed rate constant of BPA degradation (kobs) increased with NO3− concentration since more active species were generated in high NO3− concentration. The BPA degradation rate was significantly accelerated as the pH value rose. This was ascribed to the increase of the molar absorption coefficient and the amount of ionic BPA under alkaline conditions. kobs declining with increasing BPA concentration resulted from the inner filter effect and the competition of more generated intermediate products. The increasing kobs with the addition of HCO3−/CO32− (0–10 mM) was explained as the accumulation of ˙NO2 in the presence of HCO3−/CO32− in UV/NO3− process. The effect of Cl− (0–20 mM) could be ignored in this study, which suggested that reactive chlorine radicals degraded BPA effectively. The kobs reduced acutely when NOM (0–5 mgC L−1) existed in the solution, and this could be ascribed to the dual roles of the NOM inner filter effect and reactive radical scavenging effect. Further, several degradation products were detected, and possible transformation pathways were put forward. Remarkably, the acute toxicity of BPA was slightly enhanced then decayed in the UV/NO3− process.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Ming Deng,Ziqing Li,Xiaolei Deng,Ying Hu,Xiaosheng Fang
Large-scale growth and heterogeneous integration with existing semiconductors are the main obstacles to the application of metal halide perovskites in optoelectronics. Herein, a universal vacuum evaporation strategy is presented to prepare copper halide films with wafer-scale spatial homogeneity. Benefiting from the electric field manipulation method, the built-in electric fields are optimized and further boost the self-powered UV photodetecting performances of common wide-bandgap semiconductors by more than three orders of magnitude. Furthermore, with effective modulation of the interfacial charge dynamics, the as-fabricated GaN-substrate heterojunction photodetector demonstrates an ultrahigh on/off ratio exceeding 10 7 , an impressive responsivity of up to 256 mA W –1 , and a remarkable detectivity of 2.16 × 10 13 Jones at 350 nm, 0 V bias. Additionally, the device exhibits an ultrafast response speed ( t r / t d = 716 ns/1.30 ms), an ultra-narrow photoresponse spectrum with an FWHM of 18 nm and outstanding continuous operational stability as well as long-term stability. Subsequently, a 372-pixel light-powered imaging sensor array with the coefficient of variation of photocurrents reducing to 5.20% is constructed, which demonstrates exceptional electrical homogeneity, operational reliability, and UV imaging capability. This strategy provides an efficient way for large-scale integration of metal halide perovskites with commercial semiconductors for miniature optoelectronic devices.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaoyong Huang,Zhe Xu,Balaji Devakumar
Efficient broadband green-emitting phosphors are promising for application in high color rendering white light-emitting diodes (LEDs). In this paper, we report on the preparation, crystal structure and photoluminescence properties of a novel green-emitting Ca 2 LaHf 2 GaAl 2 O 12 :Ce 3+ (CLaHGA) garnet-type phosphor. All these CLaHGA: x Ce 3+ ( x = 4, 6, 8, 10, and 12 mol%) phosphors have been synthesized through using the conventional high-temperature solid-state reaction method. It has been found that the optical property of phosphors critically depends on Ce 3+ content, and the optimal doping concentration of Ce 3+ ions is 6 mol%. The optimal CLaHGA:6%Ce 3+ sample has a cubic structure with the space group Ia 3 ‾ d and lattice parameters of a = b = c = 12.62662 Å and V = 2013.08 Å 3 . The CLaHGA: x Ce 3+ phosphors exhibit an intense absorption band in the 300–485 nm range with a peak at 421 nm, due to the spin-allowed and parity-allowed 4f→5d transition of Ce 3+ ions. Upon 421 nm excitation, CLaHGA: x Ce 3+ phosphors give rise to bright broad green emission bands in the 435–750 wavelength region with peak ranging from 519 to 531 nm, owing to the spin-allowed and parity-allowed 5d→4f transition of Ce 3+ ions. For the optimal CLaHGA:6%Ce 3+ sample, its CIE color coordinates and internal quantum efficiency are determined to be (0.3135, 0.4851) and 40.7%, respectively. The full width at half maximum of CLaHGA:6%Ce 3+ is much larger than the commercial (Ba,Sr) 2 SiO 4 :Eu 2+ green phosphor (124 nm versus 71 nm), while its emission intensity is only about 39% of that of (Ba,Sr) 2 SiO 4 :Eu 2+ . Besides, the thermal stability of CLaHGA:6%Ce 3+ has also been studied. A white LED device is fabricated using the synthesized CLaHGA:6%Ce 3+ green phosphors, showing a bright warm-white light emission with high color rendering index of Ra = 89.7 and low correlated color temperature of 4058 K.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
·
2023
·
IF 3.4
Meng Li,Fengmei Ren,Haihong Ma,Weibing Xu,Zhengfa Zhou
In this paper, hydroxyl terminated copolyesters with different double bond position and density were prepared from bio-based dibasic acids. Bio-based unsaturated polyesters with -C=CH 2 in side (MPIA), -CH=CH- in main chain (MPFA), and with -C=CH 2 in side and -CH=CH- in main chain together (BDIA) were synthesized by using itaconic acid, fumaric acid, cis -2-butene-1,4-diol, and 2-methyl-1,3-propanediol as raw materials. The number molecular weight of MPIA, MPFA and BDIA was controlled almost the same. UV-induced bio-based polyurethane adhesion-reducing adhesives (BPURA) was prepared by bio-based unsaturated polyester, isophorone diisocyanate (IPDI), chain extender and photoinitiator. BPURA produced by MPIA, MPFA and BDIA were named BPURA-1, BPURA-2 and BPURA-3, respectively. The 180 0 peel strength before and after UV irradiation of BPURA-1 was 22.07 and 0.17 N/25 mm, while that of BPURA-2 was 8.56 and 0.34 N/25 mm, respectively. It could be found that the contribution of 180 0 peel strength of -C=CH 2 in side (BPURA-1) was greater than that of -CH=CH- in the main chain (BPURA-2). SEM and 3D laser measurement microscope showed that BPURA-3 had the highest roughness after UV irradiation, which is conducive to the viscosity reduction effect of the adhesive. The 180 0 peel strength before and after UV irradiation of BPURA-3 was 21.22 and 0.11 N/25 mm, respectively, which meets the bond strength standard of temporary bonding adhesive during wafer processing.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Tao Zhang,Yajun Deng,Wenshuo Zhang,Guannan Wang,Yuye Zhong,Cheng Su,Houbin Li
To follow the sustainable tendency, natural resources have been attractive to fabricate the functional materials in various applications. In this present study, curcumin , a natural pigment, was used as a chain extender to synthesize a series of environmentally friendly waterborne polyurethane to prepare self-colored waterborne polyurethane films with excellent ultraviolet (UV) absorption properties. The effect of curcumin content on the performance of waterborne polyurethane film was investigated from the aspects of transparency, thermal stability and mechanical properties . The chemical structure of waterborne polyurethane was systematically characterized by Fourier transform infrared (FT-IR), gel permeation chromatography (GPC) and 1 H nuclear magnetic resonance ( 1 H NMR) spectrums. The transmittance of the WPU-0 without curcumin as control sample was 89.27%, in which the films WPU-1, WPU-2 and WPU-3 respectively decreased the transmittance to 87.69%, 84.38% and 76.89%, and absorbs nearly 100% in UVA (315–400 nm) and UVB (280–315 nm) radiations with increasing of the curcumin content. The thermogravimetric analysis (TGA-DTG) curves showed that the introduction of curcumin could effectively improve the thermal stability of different films. Besides, four waterborne polyurethane films were carried out the tensile stress-strain measurement to investigate the mechanical properties. When adding 6% curcumin chain extender, the stress of WPU-1 film increased to 28.73 MPa relative to the control sample WPU-0 which of the value was only 12.45 MPa. Beyond expectation, while adding 12% and 18% curcumin content, the stress of WPU-2 and WPU-3 films gradually decreased to 20.18 MPa and 11.48 MPa, respectively. In addition, as increasing 18% proportion of curcumin, the elongation at break gradually decreased, specifically, the value at 555% of the WPU-0 sharply reduced to 233% of the WPU-3, indicating that the brittleness of the curcumin-based waterborne polyurethane was increased. The results showed that the naturally green curcumin was incorporated into the waterborne polyurethane structure, and an environmentally-friendly waterborne polyurethane film with good mechanical properties and transparency could been obtained with its own color.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Xinle Liu,Juhua Qin,Jing Wang,Yipeng Chen,Guohao Miao,Peiyao Qi,Jin Qu,Junping Zheng,Xiaofei Liu
The potential application prospects of conductive hydrogel-based flexible sensors in many emerging electronic devices have prompted intensive research on flexible hydrogel strain sensors to meet the needs of different application scenarios. Herein, by simply immersing PVA organohydrogel compounded with cellulose nanofibers (CNFs) and α-zirconium phosphate (α-ZrP) nanosheets in tannic acid (TA)/NaCl/water solvent, we prepared an organohydrogel strain sensor with excellent mechanical properties , anti-freezing and water-retention properties, transparency and UV filtration, and excellent strain sensing properties. The addition of CNFs and α-ZrP nanosheets could synergistically improve the mechanical properties of the organohydrogel and contributed to the enhancement of electrical conductivity with little effect on the transparency of the organohydrogel. TA was used as a physical cross-linking agent to further improve the strength of the organohydrogels (tensile strength of 5.37 MPa, toughness of 29.06 MJ/m 3 , elongation at break of 1057%) and as a UV filtering component to impart nearly 100% UV filtering performance to the organohydrogel. In addition, the organohydrogel exhibited an extremely wide linear (R 2 = 0.995) sensing range (650%), high sensitivity (GF = 2.78) and excellent cycling stability as a strain sensor to detect human motion. This integrated high-performance TA-PVA/ZC organohydrogel shows great potential for flexible sensors.
✓ 已验证
产品关联
DOI
高影响因子
PLoS One
·
2021
·Vol. 16
·期 10
·e0258483
·
IF 3.24
Wenping Dong,Chuanxi Yang,Lingli Zhang,Qiang Su,Xiaofeng Zou,Wenfeng Xu,Xingang Gao,Kang Xie,Weiliang Wang
This study investigates the degradation of nifedipine (NIF) by using a novel and highly efficient ultraviolet light combined with hydrogen peroxide (UV/H 2 O 2 ). The degradation rate and degradation kinetics of NIF first increased and then remained constant as the H 2 O 2 dose increased, and the quasi-percolation threshold was an H 2 O 2 dose of 0.378 mmol/L. An increase in the initial pH and divalent anions (SO 4 2- and CO 3 2- ) resulted in a linear decrease of NIF (the R 2 of the initial pH, SO 4 2- and CO 3 2- was 0.6884, 0.9939 and 0.8589, respectively). The effect of monovalent anions was complex; Cl - and NO 3 - had opposite effects: low Cl - or high NO 3 - promoted degradation, and high Cl - or low NO 3 - inhibited the degradation of NIF. The degradation rate and kinetics constant of NIF via UV/H 2 O 2 were 99.94% and 1.45569 min -1 , respectively, and the NIF concentration = 5 mg/L, pH = 7, the H 2 O 2 dose = 0.52 mmol/L, T = 20 ℃ and the reaction time = 5 min. The ·OH was the primary key reactive oxygen species (ROS) and ·O 2 - was the secondary key ROS. There were 11 intermediate products (P345, P329, P329-2, P315, P301, P274, P271, P241, P200, P181 and P158) and 2 degradation pathways (dehydrogenation of NIF → P345 → P274 and dehydration of NIF → P329 → P315).
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Zequn Sun,Fan Li,Kai Shi,Yiyan Gao,Lijie Duan,Guanghui Gao
Despite the significant advancements in hydrogel materials, contemporary hydrogel contact lenses still need to protect against ultraviolet rays. This study explores the impact of silane-modified silica nanoparticles (SMSi nanoparticles) and N-vinylpyrrolidone (NVP) on the properties of hydroxyethyl methacrylate (HEMA) corneal contact lenses. The average diameter of SMSi nanoparticles was 300 ± 100 nm, and in situ copolymerization was employed to create poly(HEMA-NVP-SMSi) hydrogel contact lenses. The enhanced ultraviolet–visible (UV)-absorbing hydrogel materials were analyzed for their structural, optical, and performance properties, including water content, oxygen permeability, and stability. The findings indicated that NVP increased the hydrophilicity of the material while the silica nanoparticles effectively absorbed ultraviolet rays and underwent modifications to reduce aggregation. Moreover, the oxygen permeability of the hydrogel lenses is more than double that of pure pHEMA lenses, demonstrating excellent stability and safety.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Jiazhao Yang,Fan Liu,Changshun Zhou,Hejie Li,Gaolin Yang,Shiyuan Fang,In-Seop Lee,Yi Liu,Hao Bai,Cen Chen
The modification of 3D printed porous titanium (Ti), especially for the internal pore structure , is critical and has received more attention to promoting its osteogenesis for clinical use. Ultra-violet (UV) responsive chitosan (CSMA), as an injectable filling material, was firstly incorporated into porous Ti, and then CSMA was in-situ mineralized by carbon oxide (CO 2 ) diffusion (CSMA/CaCO 3 ). Their physical-chemical and biological properties were investigated in vitro . CaCO 3 crystals within CSMA hydrogels were successfully deposited into pores of porous Ti, which exhibited favorable biocompatibility. Ti implants filled with CSMA/CaCO 3 promoted adhesion and proliferation of bone mesenchymal stem cells (BMSCs). Moreover, Ti implant filled CSMA/CaCO 3 hydrogels could increase alkaline phosphatase (ALP) activities, up-regulate osteopontin (OPN) and osteocalcin (OCN) expression levels, and enhance extracellular mineralization. 3D printed porous Ti filled with mineralized UV-responsive chitosan hydrogel could promote proliferation and osteogenesis of BMSCs, and have great potential for the modification of porous Ti implants in bone tissue engineering.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）