Frontiers in Chemistry
·
2019
·
IF 3.782
Li Zhanyi,Liu Guoguang,Su Qing,Lv Chunyan,Jin Xiaoyu,Wen Xiaoqing
Naproxen (NPX) is one of the most common pharmaceutical and personal care products found in surface water, which is recalcitrant to degradation by biological treatment or complete removal via traditional sewage treatment processes. In this study, nanoscale γ-FeOOH was synthesized and characterized by X-ray diffraction, scanning electron microscopy, surface analysis, and analysis of the forbidden bandwidth. Under UV irradiation, γ-FeOOH had the capacity to rapidly photodegrade NPX. The photodegradation rate of NPX was dependent on the concentration of γ-FeOOH in solution, initial NPX concentration, and pH. By increasing the concentration of γ-FeOOH, the NPX photodegradation rate was increased and then remained stable. Furthermore, the highest photodegradation rate for NPX was observed under acidic conditions. Through the analysis of the active substances (such as h+, e−, OH, 1O2, and O2·-) by electron spin resonance, the photocatalytic mechanism of NPX degradation on γ-FeOOH was determined to be semiconductor photocatalysis.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiaoyu Wang,Yadan Feng,Li Zhang,Iryna Protsak,Raiyanur Jamali,Yanxiang Shu,Preeti Pal,Zhen Wang,Jintao Yang,Dong Zhang
Development of ultraviolet (UV) curing technique has greatly expanded the preparation and application of polymer composite coatings due to its unique characteristics of high efficiency curing and controllable operation. However, the inevitable hazards of high pressure mercury lamps , as well as difficulty resulting from large amount of heat release when coating products, greatly limit the practical application and development of such curing coatings. Herein, a series of novel controllable, fast-cured coatings filled with high mineral contents were successfully designed and synthesized based on progressive ultraviolet light emitting diode (UV-LED) technology with ultra-low energy consumption. Due to the addition of a large number of opaque mineral particles, a new polymerization mechanism for the system was proposed and verified. Inorganic particle fillers (μm-level) can produce various degrees of reflective or refractive points, thus effectively reducing the barrier effect of the filling particles and realizing a much deeper solidification. Silver nanoparticles (AgNPs) were then combined with this composite material to fabricate a long-term antibacterial interior wall base-coating without interference with the curing effects. More importantly, the various effects of reactants of polymeric composite coatings with high inorganic mineral content for such UV-LED curing systems (365 nm) were brought to as comprehensive a conclusion as possible. This coating remained stable over a 15-week period against bacteria with the bactericidal coefficient of approximately 99.5% for E. coli and about 97% for S. aureus . We believe that proposed applicable polymerization mechanism will greatly enrich the current UV polymerization system, especially for polymer composite material with high mineral contents, and our designed wear resistance, high-hardness, and long-term antibacterial coating will also have great application prospects in many practical fields.
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FOOD HYDROCOLLOIDS
·
2022
·
IF 11.504
Jingjing Ding,Yunxing Li,Qiubo Wang,Linqian Chen,Yi Mao,Jie Mei,Cheng Yang,Yajuan Sun
Herein, we reported the use of natural, renewable, and food-grade Spirulina protein isolate nanoparticles (SPI NPs) as effective particle stabilizers for Pickering high internal phase emulsions (Pickering-HIPEs). SPI NPs were prepared using a straightforward antisolvent technique and characterized using dynamic light scattering (DLS), and zeta potential measurement as well as scanning electron microscopy (SEM). SPI NPs were afterward used as sole stabilizers to prepare the oil-in-water (O/W) HIPEs, the effects of oil content, particle concentration, and pH of aqueous phase on the microstructure, stability, and rheological behaviors of the resulting Pickering-HIPEs were investigated. The Pickering-HIPEs generated showed a self-supporting gel network, a high oil content (up to 85 vol %), and extraordinary storage stability after prolonged storage and UV exposure. Concurrently, the Pickering-HIPEs provided good UV protection for a variety of photosensitive compounds, including β -carotene, vitamin E , and limonene. These findings would not only advance the development of biocompatible particle stabilizers for Pickering-HIPEs in cosmetic, food , and pharmaceutical industries, but they would also provide a guidance for the protection of photosensitive compounds.
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WATER AIR AND SOIL POLLUTION
·
2022
·Vol. 233
·期 10
·1-13
·
IF 2.984
Wu Zuwei,Ye Yuanyao,Cai Tingting,Jiang Wei,Ren Yongzheng,Liu Dongqi,Zhang Tiancheng,Zhang YanRong
Rainwater has been used in areas that have limited water resources. In this scenario, ultraviolet (UV) disinfection is often used to improve the quality of rainwater before its reuse. However, the technology is weakened by photoreactivation and dark repair for promoting the regrowth of microbes in treated rainwater. In this work, a system integrating UV and self-doped TiO 2 nanotube arrays (the UV-TiO 2 system) was used to solve the issue. The effects of the power of UV lamps, pH value, the area of TiO 2 nanotube arrays, biomass concentration, humic acid, sulfate, and nitrate concentration on the disinfection effect of the two systems were also studied. To achieve the standard of drinking water quality, the single UV system and UV-TiO 2 system needed 17 s and 12 s respectively for the rainwater treatment at medium biomass concentration. Increasing the area of TiO 2 nanotube arrays would improve UV-TiO 2 disinfection efficiency. Furthermore, the UV-TiO 2 system could better adapt to the changes in biomass concentration and low pH conditions than the UV system. The total colony count disinfected by the UV system was approximately 3.2 times higher than that by the UV-TiO 2 system after 8-h exposure to fluorescence light. The experimental results showed that the UV-TiO 2 system was better than the UV system in terms of disinfection, faster and more efficient inactivation, and inhibition of photoreactivation and dark repair.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Jingcheng Liu,Jun Hu,Jian Li,Yue Zhang,Xiaojie Li
Two different polyurethane acrylates (PUA) were synthesized from CO 2 -polyol (PPC2000), hydroxyethyl acrylate (HEA), and isophorone diisocyanate (IPDI), or hexamethylene diisocyanate (HMDI). The successful synthesis of the PUA was confirmed with Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance ( 1 H NMR), and gel permeation chromatography (GPC). Then, a series of UV-curable strippable coatings were prepared using the synthesized PUA, photo-initiators and reactive diluents. The mechanical properties , double bond conversion, peel strength of the coatings were characterized. The results revealed that the double bond conversion rate of this series of UV-curable strippable coatings were more than 94 %, and the 180° peel strength of the coating was as high as 2.57 N/cm. In addition, the surface decontamination performance of the different coatings were studied, the results showed that the coatings could remove upwards of 90 % of the contaminants from some of the tested substrates.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Dong Lulu,Yao Zhenxing,Sun Shaohua,Wang Mingquan,Jia Ruibao
UV/peroxymonosulfate (UV/PMS) is a promising advanced oxidation technology in water treatment. This study aimed to investigate the impact of UV/PMS on humic acid (HA) and the influence of PMS dosage, pretreatment time, pH pretreatment, nitrate, nitrite, ammonium, and bicarbonate influencing factors on disinfection byproduct (DBP) formation during post-chlorination. With increased PMS dosage or pretreatment time, the UV/PMS treatment significantly reduced ultraviolet absorbance and increased mineralization. It altered the fractional constituent as humic substances were gradually transformed into building blocks and low-molecular-weight acids. However, most DBP formation increased initially and then decreased after subsequent chlorination. Rising nitrate or nitrite concentrations markedly promoted halonitromethane (HNM) formation. The presence of ammonia had a more significant impact on dichloroacetonitrile (DCAN) formation. Bicarbonate in UV/PMS pretreatment increased carbonated disinfection byproduct (C-DBP) formation, whereas it had a negligible impact on nitrogenous disinfection byproduct (N-DBP) formation. The present study revealed the impact of a series of influencing factors on DBP formation in UV/PMS reaction systems, providing comprehensive insights on applying UV/PMS in actual practice.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xin Zhang,Ruirui Cui,Min Zhang,Chaoyong Deng
The development of white light emitting diodes (WLEDs) prepared with tricolor phosphors is limited by issues such as reabsorption, difficulty in controlling sample proportions, low thermal stability, etc . This study synthesized a series of single-host Ca 2 GdNbO 6 : x Dy 3+ (CGNO: x Dy 3+ ) phosphors using High-temperature Solid-state Reaction. Then the structure characteristics, luminescence, thermal stability, and morphology were analyzed in detail. The results showed that all the samples, emitted white light superposed by the blue at 483 nm and the yellow light at 575 nm under near-ultraviolet excitation, exhibit good quantum yield, excellent optical properties, and good moisture resistance. Besides, the CIE chromaticity coordinates (CIE) and luminous pictures of CGNO: x Dy 3+ phosphors both at 352 nm and 389 nm were investigated. Then, the properties of LED devices obtained by coating the aforementioned phosphors on 365 nm and 395 nm chips were characterized. The research confirmed that CGNO: x Dy 3+ are potential single-host white light phosphors in the field of lighting.
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Water
·
2023
·Vol. 15
·期 20
·3670
·
IF 3.4
Xiaosong Zha,Shuren Wang,Deyu Zhang
N-nitrosodimethylamine (NDMA), as an emerging nitrogenous disinfection byproduct, is strictly controlled by multiple countries due to its high toxicity in drinking water. Advanced reduction processes (ARPs) are a new type of water treatment technology that can generate highly reactive reducing radicals and make environmental contaminants degrade rapidly and innocuously. In this study, a systematic investigation on the kinetics of the NDMA degradation via the chosen UV/sulfite ARP and the impacts of some key parameters of reaction system was conducted. The results indicated that the UV/sulfite ARP was an efficient and energy saving method for the reductive degradation of NDMA. A total of 94.40% of NDMA was removed using the UV/sulfite ARP, while only 45.48% of NDMA was removed via direct UV photolysis under the same reaction conditions. The degradation of NDMA via the UV/sulfite ARP followed pseudo-first-order kinetics. Increasing both the UV light intensity and sulfite dosage led to a proportional increase in the NDMA removal efficiency. The alkaline condition favored the degradation of NDMA, with the removal efficiency increasing from 21.57% to 66.79% within the initial 5 min of the reaction when the pH increased from 3 to 11. The presence of dissolved oxygen substantially decreased the removal efficiency of NDMA due to the formation of oxidizing superoxide radicals, which competed with NDMA by capturing the reducing active radicals during the reaction. An analysis of the degradation products indicated that several refractory intermediates such as dimethylamine, methylamine and nitrite were completely decomposed via the UV/sulfite ARP, and the final degradation products were formate, ammonia and nitrogen.Keywords:N-nitrosodimethylamine;UV/sulfite ARP;reductive degradation;influencing factors;mechanism
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiujuan Lin,Yaoting Zhao,Chao Wang,Wenlong Li,Rui Guo,Xiaofang Zhang,Feng Yu,Gensheng Dong,Chungang Li,Shifeng Huang
1-3 piezoelectric composites, as materials with integrated structural/functional characteristics, are typically used to manufacture ultrasonic transducers. As a core sensitive element, the structural dimensions as well as the molding quality of the 1–3 piezoelectric array, will directly affect the transducer's operating performance. In this paper, an improved soft mold process is proposed to prepare lead zirconate titanate (PZT) microscale 1–3 piezoelectric arrays by a soft mold combined with UV curing process. Firstly, the rheological behavior of PZT ceramic suspension and the preparation process of polydimethylsiloxane (PDMS) soft mold were studied. The surface contact angle of the Si master mold modified by trimethylchlorosilane (TMCS) was significantly increased, facilitating the peeling of the PDMS soft mold from the Si master mold surface, thus improving the surface quality of the PDMS soft mold. Then, the sintering process, microstructure, and electrical properties of microscale 1–3 piezoelectric arrays were systematically investigated. The perpendicularity and integrity of the piezoelectric arrays were improved by an optimized sintering process, and the arrays had micropillar diameters as small as 8 μm and aspect ratios over 7.5. The electrical properties of the piezoelectric composites with thicknesses of 55 μm and 42 μm were analyzed to obtain their resonant frequencies f s of 33.8 MHz and 41.3 MHz, respectively. The developed novel soft mold process can realize the preparation of microscale 1–3 piezoelectric arrays with fine structure and large aspect ratios, which are expected to fabricate high-frequency ultrasonic transducers.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Ruixing Gu,Yan Lv,Hao-Yang Mi,Jian Han,Chongzhao Zhang,Chuntai Liu,Changyu Shen
With the rapid development of multi-function touch panels, more requirements are raised for touch screens including anti-smudge, anti-fingerprint, and high wear resistance, hardness, and UV resistance. Herein, ladder-like poly(2-(3,4-epoxycyclohexyl)ethyltrimethoxy- co -1H,1H,2H,2H-perfluorodecyltriethoxysilsesquioxane)s (LPEFSQs) were synthesized by the sol-gel reaction of 2-(3,4-Epoxycyclohexyl)ethyltrimethoxysilane (ECTMS) with 1H,1H,2H,2H-Perfluorodecyltriethoxysilane (PFDTES) to reduce the surface energy of the coating. The incorporation of fluorine chains resulted in an improvement of water contact angle from 77.1° to 115.5°, and oil contact angle from 35.4° to 94.7°, respectively. The omniphobic property rendered the coating excellent anti-smudge and anti-fingerprint properties while maintaining an extraordinary visible light transparency of 90.1 %. A proper PFDTES fraction of 5 % and the curing agent of I-250 are desired for the coating to simultaneously realize excellent pencil hardness of 6H, anti-smudge, and wear resistance performance. The optimized LPEFSQ coating could withstand a steel wool abrasion for 500 cycles. In addition, the developed LPEFSQ coating maintained excellent omniphobicity when subjected to ultraviolet (UV) irradiation for 200 h demonstrating excellent UV resistance. Therefore, this work provides insights into the synthesis of multifunctional coatings integrated with high transparency, wear resistance, and hardness as well as anti-smudge, and anti-fingerprint properties for touch screens.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 45
·e54643
·
IF 3
Jing Chen,Bengang Li,Xiaofeng Ma,Shuai Zhou,Qun Gu,Hua Bian,Zhenyang Luo
The flexibility and functionality of conductive hydrogels are crucial to applications under various scenarios and complex environments. Due to single functionality and weakness in mechanical properties, the application of conductive hydrogels in flexible wearable devices remains a challenge. In this study, lignin-graft-poly(acrylic acid) (LPAA) was incorporated into acrylamide (AM)/sodium chloride (NaCl) solution to fabricate composite conductive hydrogels. NaCl enhanced the conductivity of hydrogels. The hydrogen-bond crosslinking network was formed by adding LPAA into the hydrogel, which enhanced the mechanical properties of the hydrogel (the tensile strength was 96 kPa and the compressive strength was 0.54 MPa). With LPAA added, the adhesion of hydrogels was improved to 11.3 kPa on glass, 14.2 kPa on plastic, and 17.3 kPa on metal. LPAA also provided excellent UV shielding ability (99.95%) for hydrogels while maintaining good transparency. The conductive hydrogels with good sensitivity (Gauge Factor = 2.51, 100%–500%) and stability can be used as strain sensors for monitoring physical activity. It is expected to be a candidate material for future flexible wearable electronic devices.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shengfa Deng,Heng Guo,Jianfeng Yan,Dezhi Zhu,Jiaqun Li,Ming Qiao,Jiawang Xie
Photodetectors are widely used in optoelectronic applications such as remote controlling, optical communication, and intelligent manufacturing. Multi-wavelength response capability can expand the application scenarios of a photodetector. However, responding to and recognizing multiple bands is still challenging for a photodetector. Here, we develop a dual-mode photodetector that can respond to and recognize near-infrared (NIR) and ultraviolet (UV) light with the assistance of a machine-learning model. A hybrid laser processing method was proposed to fabricate this photodetector based on the polyimide substrate. This method uses femtosecond laser and continuous wave laser to induce the formation of carbon and zinc oxide composite material in different forms. The femtosecond laser-processed area and the continuous wave laser-processed area realized stable NIR light detection and UV light detection, respectively. Recognition of the type of incident light was realized with the assistance of a machine-learning classification model. The proposed hybrid laser processing method combines the characteristics of two kinds of lasers and provides new insights into fabricating dual-mode photodetector. This photodetector could advance the development of dual-mode photodetection and has application potential in many fields like wearable devices and smart clothing.
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