Environmental Science-Water Research & Technology
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2022
·Vol. 8
·期 11
·2744-2760
·
IF 5.819
Ziru Li,Xia Yuan,Huili Tang,Xu Jiang,Chunge Wu,Lu Zheng,Erdeng Du,Mingguo Peng
The UV/chlorine process was utilized to degrade a common quinolone, ciprofloxacin, in water. Ciprofloxacin removal was high at 92.2% in 100 s, with a first-order rate constant of 0.0026 s−1 during the process. The degradation of ciprofloxacin was found to be positively related to UV intensity and chlorine dosage and negatively related to ammonia concentration. According to FMO, MSPA, CDFT, and topological quantum chemical analysis, the N6 or N7 atoms are the most vulnerable to electrophilic or radical attacks in the piperazine ring ciprofloxacin structure, indicating the most likely reactive sites for the initial reaction. 21 degradation products were identified, including 19 products by HRMS LC–MS and 2 by GC–MS. These intermediates were mainly produced through the following three pathways: the piperazine ring's cleavage, hydroxyl addition, and defluorination reaction. Both the acute toxicity tests and ECOSAR prediction illustrated that the ecological risks cannot be effectively removed due to the production of more toxic intermediates during the degradation process.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Haochen Zhang,Zhuoyu Li,Xiaoqun Zhou,Xiaohui Lu,Haiteng Gu,Jun Ma
The UV/chlorine (UC) system is a homogeneous advanced oxidation process with increasing attention in water decontamination . The addition of TiO 2 is a newly found strategy to enhance the generation of hydroxyl radical (HO • ) and chlorine radical (Cl • ) in the UC system. However, the crucial role of chlorine oxide radical (ClO • , generated by the reactions of HO • and Cl • with chlorine) on pollutant degradation , has not been noticed in UV/chlorine/TiO 2 (UCT), the heterogeneous photocatalytic system for chlorine activation. Herein, the role of ClO • in UCT was clarified through quenching experiments combined with model simulations during carbamazepine degradation. Tert -butyl alcohol completely inhibited while bicarbonate only partly suppressed carbamazepine degradation in UCT, indicating the important role of ClO • . The second-order reaction rate constant between ClO • and carbamazepine ( k ClO•,carbamazepine ) was fitted to be (1.21 ± 0.08) × 10 7 M −1 s −1 by the kinetic model, which avoided the influence of carbonate radical (CO 3 •− ), whose contribution couldn't be excluded during k ClO•,carbamazepine determination in commonly used competitive kinetic methods with bicarbonate. With the obtained k ClO•,carbamazepine , model simulation suggested that ClO • contributed about 50 % to carbamazepine degradation in UCT, and its concentration was less affected under varied conditions (solution pH, chlorine, bicarbonate, and chloride concentration) to keep an efficient carbamazepine degradation. On the contrary, pollutant degradation dominated by HO • in UCT was largely inhibited with the increase of pH, chlorine, and bicarbonate concentration. In addition to the promotion of degradation efficiency, less disinfection byproducts and lower energy requirement were found in UCT compared with UC. Furthermore, UCT could maintain satisfactory degradation efficiency and energy saving in ground water and surface water samples. Results of this study unraveled the crucial role of ClO • for pollutant degradation in UCT, and showed bright prospects and great potentials of the system in water treatment .
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ACS Omega
·
2022
·
IF 4.132
Jiamei Xiang,Ruixue Li,Xiang Long,Shaogui Wu,Jiayang Wang,Zhuo Wang
In this work, ultrabright fluorescent carbon dots (U-CDs) were synthesized by using a strict twice iterative optimization strategy. Their relative photoluminescence (PL) quantum yield is close to 100%, exceeding most of the reported fluorescent CDs and greatly boosting the practical applications of fluorescent CDs in many fields. Then serving as fluorescent anti-counterfeiting ink was taken as an example to briefly introduce the application of the U-CDs. The PL emission of the U-CDs is quenched at the range of pH < 4 or pH > 11 and restored at the range of pH = 5–10. This pH-sensitive PL feature allows the U-CDs to be used as fluorescent ink for pH and UV dual information encryption. The written or printed information is invisible under daylight but visible under UV light. After acid treatment or alkali treatment, the information is invisible even under a UV lamp but visible after neutralization treatment. This work provides a standardized scheme for optimizing the synthesis conditions of fluorescent CDs and paves the way for large-scale production of high-performance fluorescent CDs.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Lei Wang,Xiaodong Liu,Peng Qi,Jun Sun,Shengling Jiang,Hongfei Li,Xiaoyu Gu,Sheng Zhang
The chitosan (CS) transparent film has attracted much attention in food and medicine packaging areas due to their biodegradability and good availability. A novel carbon quantum dots compound containing nitrogen and phosphorus (NP-CQDs) was obtained by reacting citric acids , with urea and phytic acids . The density of the film was increased, and the water vapor permeation was reduced by the presence of NP-CQDs. The introduction of 4 wt% NP-CQDs increased the water contact angle of the CS film from 79.2° to 105.8°. The shielding on UV-A and UV-B transmittance was increased with the NP-CQDs loading. The film containing 4 wt% NP-CQDs blocked more than 90.2% UV-A and 96.5% UV-B; however, it only blocked 26.8% visible light. It also exhibited better antibacterial activity to both E . coli and S . aureus than the control CS film. This work provided a feasible way to prepare multifunctional bio-safe film.
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Science China-Technological Sciences
·
2021
·Vol. 65
·期 1
·179-190
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IF 3.572
Qi YuHao,Zheng JunPing
A wearable UV sensor is designed to realize UV detection and a warning effect on people’s excessive UV exposure. It is noteworthy that the photoelectric system and supporting material of the most conventional sensor are separated. The unstable connection between the two components and the complicated construction method makes the sensor susceptible to external motion interference and prone to failure. Herein, we developed a unique photo response mode of the UV sensor based on a novel photo responsive material. An azobenzene-containing polydimethylsiloxane (Azo-PDMS) film was prepared as the outer layer of the sensor. It integrated the functions of photo response source, support and protection, which realized the direct contact and rapid response to the UV light source. Carbon nanotube (CNT), wrapped in the middle of Azo-PDMS films as an inner layer, transformed the photomechanical response signal into the photoelectric signal. The photo response mode endows the sensor with excellent anti-motion interference capabilities and a true sense of UV-strain synchronous monitoring performance, which is of great significance to the practical application of wearable devices. In addition, based on the excellent properties of Azo-PDMS, the sensor can also protect the human body from UV damage, self-repair after fracture, and realize personalized customization through 3D printing. It makes a breakthrough in the design and construction of wearable UV sensors and paves a new way to optimize sensor photo response modes.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Yuerong Yang,Yu Lu,Yinchuan Liu,Yu Pan,Hongjuan Ma,Linjuan Huang,Zhongfu Wang
Yak milk (YM) has higher protein content than other bovine milk (BM) varieties. The bioactivity of milk glycoproteins is related to N / O -glycans. We qualitatively and quantitatively compared the N / O -glycome of YM and BM glycoproteins using stable isotope labeling combined with hydrophilic interaction chromatography and electrospray ionization mass spectrometry. We identified 79 and 78 N -glycans in YM and BM, respectively. Two N -glycans (H4N5F1A1; H5N4F1) were exclusive to YM. The content ratios of different types of N -glycans differed significantly between YM and BM, with sialylated N -glycans 2.33 times more abundant in YM. Five and seven O -glycans were detected in YM and BM, respectively. Two O -glycans (H1N2; H1N2A1) were exclusive to BM. The bi-sialylated O -glycan, H1N1A2, accounted for 56.1% of O -glycans in YM; it was 5.97 times more abundant in YM than in BM (equal volume basis). This study provides a theoretical basis for the future utilization of YM as a functional food.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaobin Zhan,Xuning Zhang,Zhiyong Liu,Chen Chen,Lingxian Kong,Shulan Jiang,Shuang Xi,Guanglan Liao,Xingyue Liu
All-inorganic CsPbCl3 perovskite in ultraviolet (UV) detection is drawing increasing interest owing to its UV-matchable optical band gap, ultrahigh UV stability, and superior inherent optoelectronic properties. Almost all of the reported CsPbCl3 photodetectors employ CsPbCl3 nano- or microstructures as sensitive components, while CsPbCl3 polycrystalline film-based self-powered photodetectors are rarely studied on account of the terrible precursor solubility. Herein, a novel sequential vapor-deposition technique is demonstrated to fabricate CsPbCl3 polycrystalline film for the first time. High-quality CsPbCl3 films with excellent optical, electronic, and morphological features are obtained. A self-powered photodetector based on the CsPbCl3 film is constructed without any charge transport layer, showing a high UV detection performance. A thin p-type PbS buffer layer is further introduced to passivate the surface defects of the CsPbCl3 layer and decrease the interfacial energy barrier by forming a type-II heterojunction, contributing to a faster hole extraction rate and a suppressed dark current level. The best-performing device achieves an ultrafast response time of 1.92 μs, an ultrahigh on/off ratio of 2.22 × 105, and a responsivity of 0.22 A/W upon 375 nm UV illumination at 0 V bias. This comprehensive performance is the best among all of the CsPbCl3 photodetectors reported to date. The as-prepared photodetectors also present an eminent UV irradiation and long-term durability in ambient air. Furthermore, a large-area and uniform 625-pixel UV image sensor is fabricated and attains a prominent imaging capability. Our work opens a new avenue for the scalable production of CsPbCl3-based optoelectronics.
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Materials
·
2021
·Vol. 14
·期 22
·7002
·
IF 3.623
Jiayi Chen,Kuang Wang,Jialong Tian,Wenhui Yu,Yujie Chen,Na Li,Zhenming Qi,Chunxia Wang
In this work, a visible-light-driven BiOCl/Bi2WO6photocatalyst was obtained via a facile hydrothermal method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS), ultraviolet/visible light diffuse reflection spectroscopy (UV/Vis), and photocurrent (PC). BiOCl/Bi2WO6was modified with (3-chloro-2-hydroxypropyl) trimethyl ammonium chloride to obtain the cationized BiOCl/Bi2WO6. Cotton fabric was pretreated with sodium hydroxide (NaOH) and sodium chloroacetate solution to obtain carboxymethylated cotton fabric, which was further reacted with cationized BiOCl/Bi2WO6to achieve finished cotton fabric. The cotton fabrics were characterized by Fourier-transform infrared spectroscopy (FT-IR), XRD, SEM, and EDS. The photocatalytic activity of the BiOCl/Bi2WO6photocatalyst and cotton fabrics was assessed by photocatalytic degradation of MB (methylene blue) solution under simulated visible light. The self-cleaning property of cotton fabrics was evaluated by removing MB solution and red-wine stains. Results revealed that the coated cotton fabrics exhibited appreciable photocatalytic and self-cleaning performance. In addition, anti-UV studies showed that the finished cotton fabrics had remarkable UV blocking properties in the UVA and UVB regions. Therefore, the finished cotton fabric with BiOCl/Bi2WO6can provide a framework for the development of multifunctional textiles.Keywords:BiOCl/Bi2WO6;cotton fabric;UV shielding;photocatalysis;self-cleaning
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PROGRESS IN ORGANIC COATINGS
·
2021
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IF 5.161
Jia Huang,Jinshuai Zhang,Guoqiang Zhu,Xixi Yu,Yun Hu,Qianqian Shang,Jianqiang Chen,Lihong Hu,Yonghong Zhou,Chengguo Liu
Development of self-healing UV-curable coatings from biorenewable resources is of great significance for sustainable development and environmental protection. In this work, a biobased UV-curable oligomer was firstly synthesized by ring-opening reaction of epoxidized rubber seed oil with glycidyl methacrylate-modified itaconic acid precursor. Chemical structure of the obtained oligomer was then characterized by FT-IR, 1 H NMR, and gel permeation chromatography . Subsequently, a series of UV-curable coatings were prepared by co-photopolymerization of the oligomer with the hydroxyethyl methacrylate diluent. UV-curing behaviors, biobased contents, and ultimate properties such as thermal, mechanical, and coating properties were studied. Furthermore, dynamic transesterification reactions were activated at elevated temperatures in the presence of a Zinc catalyst, thus self-healing, shape memory, malleable, and recyclable properties were further investigated. Notably, the obtained UV-curable coatings demonstrated good self-healing properties (86–100% at 200 °C for 30 min), high biobased contents (45.4–72.3%), and high performance (tensile strength and glass transition temperature up to 22.4 MPa and 119.2 °C, respectively).
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
·
IF 3.764
Qiuyu Tang,Qian Li,Yunhan Luo,Xun Pan,Zhenhao Xi,Ling Zhao
Acrylated epoxidized soybean oil (AESO) as a biobased curable oligomer with different functionalities and poly(octamethylene maleate (anhydride) citrate) (POMaC) as a biobased unsaturated monomer with polar groups were both synthesized. The chemical structures of POMaC and AESO were confirmed by Fourier transform infrared (FT-IR) and 1H nuclear magnetic resonance (1H NMR) spectroscopies. Then POMaC was used to copolymerize with AESO to prepare a series of high biobased content coatings via an ultraviolet (UV) curing process. The thermomechanical properties and coating properties in terms of hardness, adhesion, and water contact angle (WCA) were also investigated. The results show that AESO/POMaC coating has improved thermal stability and improved hardness compared with bare AESO-based coating. Furthermore, the adhesion of AESO/POMaC was markedly improved by 290%. The mechanism of adhesion enhancement was investigated by the combination of experiment and simulation. The decreased water contact angle represents the enhanced surface free energy of AESO/POMaC, and the molecular dynamics simulation results show higher binding energy and more hydrogen bonds of AESO/POMaC with the substrate. These results confirm that the polar groups and high soft-segment content of AESO/POMaC coating could strongly interact with the surface and could provide more adhesion contact area, which is responsible for the increased adhesion under dry and wet conditions. This work illustrates the potential of POMaC, as a renewable alternative component for the development of high-performance AESO-based green coatings in the future.
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Journal of Water Process Engineering
·
2020
·
IF 3.465
Zhuang Lin,Wenlei Qin,Lei Sun,Xiangjuan Yuan,Dongsheng Xia
The degradation of Bisphenol A (BPA) in the vacuum ultraviolet/ ultraviolet/ peroxymonosulfate (VUV/UV/PMS) process based on a mini-fluidic VUV/UV photoreaction system has been comprehensively investigated focusing on the degradation performances and kinetics in this study. With 20 min reaction at pH 7.0 in VUV/UV/PMS process, the removal efficiency and the apparent degradation rate constant ( k app ) of BPA were > 95.2 % and 0.145 min −1 (R 2 = 0.9935). In addition, the impacts of operational parameters and co-existing constituents on BPA degradation are systematically evaluated. Importantly, the effective degradation of BPA (> 96.1 % at least) achieved at the test pH conditions (5–11) after 30 min reaction and achieved the highest BPA removal rate at pH = 11 (0.243 min −1 , R 2 = 0.9952). The electron paramagnetic resonance and radical scavenger experiments confirmed that both hydroxyl radical ( OH) and sulfate radical (SO 4 − ) are the predominant reactive radicals in VUV/UV/PMS process. The second-order reaction rate constants of BPA with OH and SO 4 − under different pH conditions were determined to be 0.74–1.86 × 10 10 M −1 s −1 and 2.92–5.01 × 10 9 M −1 s −1 via the competition kinetics. Meanwhile, the relative contribution rate of OH decreased from 97.2 %–33.1 % with the increasement of pH from 5.0 to 11.0, while the relative contribution rate of SO 4 − rose from 1.7 % to 48.9 %. The present study demonstrated that the VUV/UV/PMS process, as a new advanced oxidation process, has potential applications for micropollutants removal in water.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 14
·50135
·
IF 2.52
Fei Meng,Yaseen Muhammad,Yuting Ye,Jiaqi Ji,Hua Tao,Junxian Huang,Zhaorong Zhu,Jing Li
This study reports the application of UV induced “thiol-ene click reaction” by coupling the covalent bonds of venyl-terminated dendritic polyester (VTDP) and polyester (PET) fiber and resulting in the fabrication of hyperbranch-structured PET named as VTDP-PET fiber. The PET fiber or VTDP-PET fiber as additives were blended with styrene-butadiene-styrene modified asphalt (SBSMA) to prepare fiber/SBSMAs. Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectrometry, and X-ray photoelectron spectroscopy characterizations indicated that VTDP-PET fiber was linked with spherical three-dimensional dendritic molecular structure. Cone penetration, dynamic shear rheometer, multistress creep recovery, and thermogravimetric analysis tests showed that VTDP-PET/SBSMA exhibited enhanced resistance to flow, viscoelasticity, resistance against rutting, and thermal stability as compared to those of PET/SBSMA. The newly designed PET fiber and VTDP-PET fiber can be envisioned as effective alternative candidate for the fabricated of modified SBSMA with enhanced performances for practical applications in construction and highway industries.
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