Journal of Water Process Engineering
·
2022
·
IF 7.34
Jie Wang,Yang Liu,Lei Feng,Yue Wang,Hui Jia
It is important to regulate the in-situ generated iron(III) (hydr)oxides with the function of adsorption/coagulation during ferrate (Fe(VI)) oxidation and hydrolysis which was beneficial for removal of natural organic matter (NOM). This study investigated the effect of UV activation on the Fe(VI) hydrolysis and Fe(III) flocculation performance. Results indicated UV activation can effectively improve the protein and humic acid(HA) removal in natural surface water. In situ UV differential absorption spectroscopy showed that UV effectively activated the hydrolysis of Fe(VI), which converted Fe(VI) into intermediate high-valence iron with higher reactivity, and promoted polynuclear Fe-Hydroxide and iron(III) (hydr)oxide (PnFe-H), which improved the oxidation and flocculation of pollutants. With the radical species analysis, UV activation promoted the generation of Fe(IV) and H 2 O 2 , which greatly increased the generation rate of superoxide radicals (O 2 •- ) and hydroxyl radicals (•OH). Furthermore, the structure analysis of the hydrolysate proved that UV enhanced the hydrogen bond and produced a large number of polar hydroxyl groups combined with iron ions, which further triggered the conversion of Fe(III) into amorphous Fe-hydroxide and ferrihydrite with large specific surface area and high surface activity. Meanwhile, the aggregation behavior and interaction energy of Fe-(oxy)hydroxide indicated that the lower free energy obtained in UV-activation system and increased the aggregation. This study clarified new insights on UV-activated ferrate, which can expand our understanding on ferrate applications in water purification processes.
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JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
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2021
·Vol. 36
·期 12
·2735-2743
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IF 4.023
Mengtian Li,Yi Luo,Zhirong Zou,Fujian Xu,Xiaoming Jiang,Xiandeng Hou
An ultraviolet light emitting diode (UV-LED) array chip as the irradiation source for nano-TiO2 catalyzed photochemical vapor generation (PCVG) was combined with a hollow electrode point discharge microplasma optical emission spectrometer (HEPD-OES) to realize instrumental miniaturization, and utilized for quantitative analysis of trace selenium (Se). Under the irradiation of the UV-LED array chip, Se(IV) and Se(VI) could be effectively converted into volatile species in a miniature quartz coil coating with nano-TiO2 on its inner wall as a photocatalyst. Meanwhile, volatile analyte species were totally guided into the hollow electrode and transported into the inside of micro-discharge plasma for excitation and enhanced sensitivity. Experimental conditions of PCVG and HEPD-OES were investigated in detail using an analytical line of Se at 203.98 nm through the peak area integrated for quantitation. Under optimized experimental conditions of 0.6 mL sample volume, 10% (v/v) acetic acid, 370 nm and 50 W LED, and 75 s UV irradiation, Se(IV) and Se(VI) could be detected with the same LODs, 3.9 μg L−1 and 4.1 μg L−1, respectively. The accuracy of the proposed method was validated by the analysis of the Certified Reference Materials (CRMs, GBW(E)080395 and BWB2427-2016) and real water samples. With the advantages of high compatibility, high efficiency, small size and low power consumption, the integration of UV-LED array chip based PCVG and HEPD-OES would be beneficial to fabricate miniaturized and portable devices for field analysis.
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CELLULOSE
·
2021
·Vol. 28
·期 9
·5923-5935
·
IF 5.044
Yang Yingying,Zhang Shiyu,Huang Wei,Guo Zengpei,Huang Jingjing,Yang Hongjun,Ye Dezhan,Xu Weilin,Gu Shaojin
In this study, a multifunctional cotton fabric with durable superhydrophobic, antibacterial, and UV resistance properties was prepared by in situ growth of zeolitic imidazolate framework-67 on cotton fabric surface, followed by polydimethylsiloxane modification. The as-obtained multifunctional cotton fabric not only showed superhydrophobicity with a water contact angle of 153.0° ± 2.7°, but also displayed good UV resistance with a UV protection factor value of 32. Furthermore, the as-obtained cotton fabric exhibited excellent antibacterial activities against S. aureus and E. coli . Besides, the as-prepared multifunctional cotton fabric had good resistance to mechanical abrasion. Consequently, this multifunctional fabric could be potentially applied to antibacterial and anti-ultraviolet field. Graphic abstract
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Materials Today Chemistry
·
2021
·
IF 8.301
Zongjie Zhang,Balaji Devakumar,Shaoying Wang,Liangling Sun,Nan Ma,Wei Li,Xiaoyong Huang
White light-emitting diodes (LEDs) with high color rendering index (CRI) and low correlated color temperature (CCT) are desirable for next-generation solid-state lighting. In this work, we demonstrated an efficient near-UV-excited cyan-emitting phosphor based on Ce 3+ -doped Ca 2 LuHf 2 Al 3 O 12 (CLHAO) garnet , which could be used to cover the cyan gap for fabricating high-CRI warm-white LEDs. We found that the CLHAO:Ce 3+ samples exhibited a broad excitation band in the 300–450 nm wavelength range peaking at 400 nm, and upon 400 nm excitation they showed broad cyan emission bands in the 420–600 nm spectral region with peak positions ranging from 477 to 493 nm. The optimal CLHAO:0.02Ce 3+ sample had CIE color coordinates of (0.160, 0.255), and its internal and external quantum efficiencies were measured to be 84.3% and 60.8%, respectively. Impressively, the luminescence intensity of CLHAO:0.02Ce 3+ sample at 423 K still remained at 62% of the initial value at 303 K, and the chromaticity shift was calculated to be as low as 1.7 × 10 −2 , revealing its high thermal stability and color stability at a higher temperature. Finally, a warm-white LED device (CCT = 3,194 K) was fabricated by combining CLHAO:0.02Ce 3+ cyan phosphors with commercial blue/green/red tricolor phosphors, showing bright white-light emission with a high CRI of 89.4, which was superior to that of another warm-white LED device (CRI = 83.2) fabricated without CLHAO:0.02Ce 3+ cyan phosphors. These outstanding luminescence properties of CLHAO:Ce 3+ cyan phosphors illustrated that they offer a new feasible approach for the production of high-CRI warm-white LEDs toward high-color-quality solid-state lighting.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Nan Ma,Wei Li,Balaji Devakumar,Zongjie Zhang,Xiaoyong Huang
White light-emitting diodes (LEDs) are widely used in lighting and display devices, and the exploration of phosphors with excellent luminescence performance and good stability is the key to the development of white LEDs. In this work, we reported novel near-UV-excited green-emitting Ca 2 LuHf 2 (AlO 4 ) 3 :Ce 3+ ,Tb 3+ garnet phosphors with efficient Ce 3+ → Tb 3+ energy transfer. The CLHA:Ce 3+ ,Tb 3+ green phosphors were successfully synthesized by a high-temperature solid-state method, and the phosphors were characterized by X-ray diffraction, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, elemental mapping, photoluminescence excitation and photoluminescence spectra, the Commission International de I’Eclairage (CIE) chromaticity coordinates, quantum efficiency and temperature-dependent emission spectra. Due to the spin-allowed 4f → 5d transition of Ce 3+ ions, the CLHA:Ce 3+ ,Tb 3+ phosphors exhibited a strong broad excitation band in the 300–470 nm near-ultraviolet (near-UV) range. Under 408 nm excitation, the CLHA:Ce 3+ ,Tb 3+ phosphors showed strong green light with emission center at 543 nm. The mechanism of energy transfer from Ce 3+ to Tb 3+ ions was attributed to quadruple-quadruple interaction. Impressively, the internal quantum efficiency and external quantum efficiency of the optimal CLHA:0.02Ce 3+ ,0.5Tb 3+ green phosphors were measured to be 77.1% and 55.8%, respectively. Finally, using the CLHA:0.02Ce 3+ ,0.5Tb 3+ phosphors as green-emitting color converter, a near-UV-pumped white LED device was fabricated, and under 80 mA driving current the LED device demonstrated bright warm-white light with high color rendering index (93.7), low correlated color temperature (3574 K), CIE chromaticity coordinates (0.3922, 0.3633), and high luminous efficacy (29.35 lm/W).
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Shang Li,Yi Tao,Guo-Hua Dao,Hong-Ying Hu
The risk of harmful algal blooms (HABs) in the water recharged with reclaimed water is a bottleneck for water reuse . The suppression effects and mechanisms of the combination of UV-C and berberine on Microcystis aeruginosa and Scenedesmus obliquus in reclaimed water were investigated. Mono UV-C irradiation at 75 mJ cm −2 could suppress the growth of M. aeruginosa for 7 d and that at 90 mJ cm −2 could suppress the growth of S. obliquus for 5 d. UV-C irradiation combined with 0.2–2 mg L −1 berberine lengthened the inhibition period of M. aeruginosa to 10- > 22 d and that of S. obliquus to 7- > 22 d and induced more rapid lethal effects on the harmful microalgal cells, in significant synergetic patterns. The combination of UV-C and berberine suppressed total, intracellular and extracellular microcystin-LR (MC-LR) more effectively and decreased the MC-LR quota significantly, which further reduced the risks of microcystin production and release. Furthermore, synergetic mechanisms of the combined treatments were systematically investigated from the aspects of photosynthetic system (photosynthetic activity and pigments), metabolic activity (ATP and membrane potential), oxidation stress (reactive oxygen species (ROS) and glutathione (GSH)), and apoptosis-like cell death (phosphatidylserine (PS) ectropion, caspase-3 activity and terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) positive rate). The combination treatment provided a joint attack of UV-C and berberine on photosynthetic transport chain of photosynthetic system II (PS II), and a synergetic pathway to achieve more severe disruptions in energy metabolism as well as aggravated oxidative stress . The accumulated ROS enhanced increases in programmed cell death (PCD) indicators of both microalgal species, which contributed to the enhancement effects on growth suppression. The results showed that the combination treatment achieved lower dose requirements of both UV-C irradiation and berberine for inducing the same inhibition effects on microalgal cells, which was promising to be applied in the HABs control of reclaimed water.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Jingyu Xu,Weiming Liu,Jinghui Zhou,Yue Kong,Mingzhu Gong,Masod Almajarsh,Xiaozhou Zhao,Xing Wang
Personal multifunctional protective mask is becoming an effective and convenient device for maintaining human health. When used in a normal environment, it can prevent the spread of respiratory viruses and bacteria, and absorb UV rays. When used in extreme environments full of iodine vapor, it can effectively absorb iodine vapor. Herein, an eco-friendly multifunctional nanofiber membrane with rapid sterilization ability, ultraviolet absorption and iodine vapor trapping capacity was prepared using lignin and polyvinylpyrrolidone as raw materials through electrostatic spinning technology. The results showed that PVP-WSL and PVP-IL have bactericidal rates of 21.86% and 34.08% for E. coli , 30.27% and 52.64% for S. aureus , respectively. These mask barriers have good UV resistance performance (the UV transmittance was lower than 0.015%) and effective trapping capacity of iodine vapor (the iodine maximum trapping capacity of the PVP-WSL and PVP-IL nanofiber membranes were equally determined to be 294 mg/g and 225 mg/g, respectively). In addition, these membranes have strong thermal stability (initial thermal decomposition temperature was higher than 350 °C) and mechanical properties (tensile strength higher than 1.07 MPa). This work fully meets the requirements of public health protection for degradable and high-performance media and is ideal for multifunctional personal protective equipment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yuxuan Ren,Zhe Ling,Caoxing Huang,Chenhuan Lai,Qiang Yong
Anti-ultraviolet material with cost-effectiveness, environmental friendliness, and multifunction is urgently needed to address the serious problem of ultraviolet radiation . However, traditional anti-ultraviolet products based on plastics are unsustainable and harmful to the environment. Herein, the cellulose films with a sandwich structure using a surface assembly technique were reported. Natural L -phenylalanine was grafted onto cellulose nanofibrils via amidation to enhance their UV-shielding property. To address the hydrophilic nature and limited mechanical strength of cellulose films, we employed octadecyltrichlorosilane and 4ARM-PEG-NH 2 for hydrophobic coating and mechanical reinforcement, respectively. In addition to providing complete UV resistance in the wavelength range of 200–320 nm, sample OPT5 exhibited significantly improved tensile stress, Young's modulus , and toughness, measuring 174.09 MPa, 71.11 MPa, and 295.33 MJ/m 3 , respectively. Furthermore, due to the presence of antibacterial amine groups, the modified film demonstrated a satisfactory inhibitory effect on the growth of Escherichia coli and Bacillus subtilis . Compared to natural cellulose films, the hydrophobically modified material achieved a contact angle of up to 121.1°, which enabled efficient separation of oil-water mixtures with a maximum separation efficiency of 93.87 %. In summary, the proposed TOCNF-based UV-shielding film with multifunctionality holds great potential for replacing petrochemical-derived plastics and serving as an applicable and sustainable membrane material.
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CARBON
·
2023
·
IF 10.9
Xiao Gong,Qingqing Xu,Xiaona Chen,Fanchao Meng,Hangxiang Wang
In this age of technology, people are inevitably surrounded by electronic devices and light-emitting devices, but the radiation generated by these devices is very harmful to humans. Therefore, it is crucial to develop a stable absorbing material with efficient absorption capacity for UV and high-energy blue light (HEBL). In this paper, we report that carbon nanodots (CDs) with strong absorption peaks in the UV and HEBL can be rapidly synthesized in large scale by simply heating urea and citric acid at high temperature under atmospheric pressure without using any solvents. Interestingly, the large-scale prepared CDs possess green fluorescence emission upon excitation in both the UV and HEBL regions, exhibiting good photoconversion ability. Furthermore, ultrahigh efficient UV and HEBL shielding films can be prepared by embedding the CDs in a carboxymethyl cellulose matrix. By characterizing their transmission and absorption spectra , it can be found that the cellulose films containing 0.2 wt% CDs achieve almost complete shielding of UV-A, UV-B, and HEBL with a guaranteed visible light (550 nm) transmission rate of 80% or above. Finally, this cellulose film was further attached to a light-emitting diode (LED) chip to investigate its practical use in the field of UV and strong blue light shielding.
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JOURNAL OF SUPERCRITICAL FLUIDS
·
2023
·
IF 3.9
Wei Guo,Ben Li,Haijun Chi,Zhongliang Jiang,Liu Qing Wei,Edward D. Ramsey
Two flow selection interfaces have been developed for connecting single or linked reactors with on-line SFC equipped with UV/Vis diode-array (DAD) and mass spectrometer detectors coupled in series (SFC-DAD-MS). This process analytical technology system, enabled the study of reactions performed in supercritical fluid carbon dioxide (SF-CO 2 ). Each interface is designed to obtain on-line samples at different reaction progress points. Three single stage electrophilic annulation reactions performed in SF-CO 2 using aniline, indole and pyrrole as amine reactants to synthesize N-heterocyclic products within a stirred continuous flow reaction vessel containing montmorillonite K-10 catalyst were monitored. Also, both stages of a two step synthetic procedure conducted within two connected continuous flow reaction coil systems were monitored using on-line SFC-DAD-MS. The first step involved a Knoevenagel reaction in SF-CO 2 that provided a continuous feed to perform a second stage acetylation reaction. Use of on-line SFC-DAD-MS enabled early detection and characterization of unexpected by-products.
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JOURNAL OF STEROID BIOCHEMISTRY AND MOLECULAR BIOLOGY
·
2023
·
IF 4.1
Mengyun Wang,Yang Yu,Yunbing Tang,Chengshuang Pan,Qianjin Fei,Zhiyan Hu,Huitao Li,Yang Zhu,Yiyan Wang,Ren-shan Ge
Benzophenone (BP) ultraviolet (UV) -filters have been widely used to prevent adverse effects of UV. Whether they can disrupt gonadal steroidogenesis remains unclear. Gonadal 3β-hydroxysteroid dehydrogenases (3β-HSD) catalyse the conversion of pregnenolone to progesterone . This study explored the effect of 12 BPs on human, rat, and mouse 3β-HSD isoforms , and analysed the structure-activity relationship (SAR) and underlying mechanisms. The inhibitory potency was BP-1 (IC 50 , 5.66 ± 0.95 μM) > BP-2 (5.84 ± 2.22 μM) > BP-6 (185.8 ± 115.2 μM) > BP3-BP12 on human KGN 3β-HSD2, BP-2 (5.90 ± 1.02 μM) > BP-1 (7.55 ± 1.26 μM) > BP3-B12 on rat testicular 3β-HSD1, and BP-1 (15.04 ± 5.20 μM) > BP-2 (22.64 ± 11.81 μM) > BP-6（125.1 ± 34.65 μM）> BP-7 (161.1 ± 102.4 μM) > other BPs on mouse testicular 3β-HSD6. BP-1 is a mixed inhibitor of human, rat, and mouse 3β-HSDs, and BP-2 is a mixed inhibitor of human and rat 3β-HSDs and a noncompetitive inhibitor of mouse 3β-HSD6. 4-Hydroxyl substitution in the benzene ring plays a key role in enhancing potency of inhibiting human, rat, and mouse gonadal 3β-HSDs. BP-1 and BP-2 can penetrate human KGN cells to inhibit progesterone secretion at ≥ 10 μM. Docking analysis revealed that the 4-hydroxyl group of BP-1 and BP-2 forms hydrogen bonds with residue Ser123 of human 3β-HSD2 and residue Asp127 of rat 3β-HSD1. In conclusion, this study demonstrates that BP-1 and BP-2 are the most potent inhibitors of human, rat, and mouse gonadal 3β-HSDs and that there is a significant SAR difference.
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Polymers
·
2019
·Vol. 11
·期 9
·1397
·
IF 3.164
Luwei Zhang,Haijuan Kong,Mengmeng Qiao,Xiaoma Ding,Muhuo Yu
Aramid fibers (AFs) with their high Young′s modulus and tenacity are easy to degrade seriously with ultraviolet (UV) radiation that leads to reduction in their performance, causing premature failure and limiting their outdoor end use. Herein, we report a method to synthesize nano-SiO2on AFs surfaces in supercritical carbon dioxide (Sc-CO2) to simultaneously improve their UV resistance, thermal stability, and interfacial shear strength (IFSS). The effects of different pressures (10, 12, 14, 16 MPa) on the growth of nanoparticles were investigated. The untreated and modified fibers were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). It was found that the nano-SiO2-decorated fibers exhibited improvement of thermal stability and mechanical properties, and the IFSS of the nano-SiO2modified fibers increases by up to 64% compared with the untreated fibers. After exposure to 216 h of UV radiation, the AFs-UV shows a less decrease in tensile strength, elongation to break and tensile modulus, retaining only 73%, 91%, and 85% of the pristine AFs, respectively, while those of AFs-SiO2-14MPa-UV retain 91.5%, 98%, and 95.5%. In short, this study presents a green method for growing nano-SiO2on the surface of AFs by Sc-CO2to enhance the thermal stability, IFSS, and UV resistance.Keywords:aramid fiber;nano-SiO2;supercritical CO2;thermal stability;interfacial shear strength;UV resistance
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