ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Shuaipeng Wang,Jinyue Dai,Na Teng,Jingyuan Hu,Weiwei Zhao,Xiaoqing Liu
Using renewable resources to synthesize a mechanically robust and self-healing UV-curable material is very important for the development of sustainable coatings. In this study, two kinds of UV-curable monomers synthesized from renewable feedstock, malic acid–glycidyl methacrylate (MG) and citric acid–glycidyl methacrylate (CG), were obtained under solvent-free conditions. As a result of high cross-linking density and abundant hydrogen bonds formed in networks, the cured MG and CG show high glass transition temperature, tensile strength, and modulus comparable to or better than those of the UV-curable material prepared from commercial bisphenol A epoxy acrylate (BPAEA). Meanwhile, taking advantage of −OH groups and the increase in ester concentration at elevated temperatures, the efficient self-healability of cured resins can be accomplished without an external catalyst through dynamic transesterifications. In this work, the cured MG and CG exhibit great potential in advanced coating applications, which introduces the first UV-curable materials with an integration of high mechanical performance and catalyst-free self-healing properties, obtained from bioresources.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Shishun Wang,Congwei Luo,Fengxun Tan,Xiaoxiang Cheng,Qiao Ma,Daoji Wu,Peijie Li,Fumiao Zhang,Jun Ma
The efficiency of Congo red (CR) removal by low-pressure ultraviolet photolysis of nitrate (UV/NO 3 − ) process was investigated in this study. Results showed that CR degradation through direct UV (254 nm) photolysis could be ignored, but CR was obviously removed in UV/NO 3 − process. Moreover, the contributions of UV, NO 2 and OH to the degradation of CR were explored to be roughly 0.63%, 17.46% and 81.90%, respectively. In addition, the observed pseudo-first-order rate constants for the degradation of CR ( k obs ) were assessed by the effects of different water matrices and operation conditions, including NO 3 − dosage, CR concentration, solution pH, chloride ion (Cl − ), natural organic matter (NOM) and carbonate/bicarbonate (CO 3 2− /HCO 3 − ). The k obs was increased by nearly 12.9 times with the addition of NO 3 − dosage from 1 mM to 200 mM due to the generation of more active components (e.g., OH and NO 2 ). Higher doses of CR reduced the k obs , which could be attributed to the filter effects of CR on UV irradiation. Although the photolysis of NO 3 − could be expedited under acidic conditions, the k obs was decelerated because of the protonation of CR (pKa = 4.1, 25 °C). While in alkaline conditions, the k obs was also reduced as the decrease in redox potential of OH. The presence of Cl − (0–7 mM) exhibited no scavenging effect on the k obs , which suggested the secondary radicals (i.e., chlorine radicals (e.g., Cl , Cl 2 − )) could oxidize CR effectively. NOM restricted the degradation of CR significantly, resulting from the filter effects of NOM ( ε = 0.11 L mgC −1 cm −1 ) on UV and the effects of radical scavenging. The k obs was improved obviously with the participation of CO 3 2− /HCO 3 − (0–7 mM), ascribing to the oxidation of carbonate radical (CO 3 − ) and the increased steady state concentration of NO 2 . The degradation of CR in UV/NO 3 − process has the potential for practical applications in real water. Furthermore, eight intermediates were proposed by Liquid chromatography-tandem mass spectrometry (LC-MS/MS). Hydroxylation, nitrification and other aromatic products in the reaction of CR with OH and/or NO 2 were readily produced by H-abstraction, addition reaction and electron transfer.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Qing Liu,Yu Qing Yang,Xingfu Wang,Weidong Song,Xingjun Luo,Jiaqi Guo,Jiang Shi,Chuan Cheng,Dongyang Li,Longfei He,Kai Li,Fangliang Gao,Shuti Li
ABSTRACT In recent years, the combination of perovskites with other materials to improve the photoelectric performance has received widespread attention. In this work, we demonstrate a hybrid heterostructure photodetector with the combination of GaN microwire array and perovskite. Compared to perovskite and GaN microwire array photodetectors, the hybrid CH 3 NH 3 PbI 3- x Cl x /GaN microwire array photodetector exhibits more excellent photoelectric performances in a wide detection range from ultraviolet to visible. Under 325 nm laser irradiation, the hybrid photodetector generates a large photocurrent (1.04 ×10 -5 A), a high on/off ratio (>10 4 ), a fast response time (raise time of 0.66 ms and decay time of 0.71 ms), and higher responsivity , detectivity. Meanwhile, when the perovskite is combined with the GaN microwire array, the device also has a higher photocurrent, on/off ratio, and faster photoresponse compared with the perovskite photodetector in the visible light region. This is interpreted as the effective separation photogenerated carriers at the hetero-interface, and the directional transfer of carriers within the one-dimensional GaN microwire array. This study sheds light on fabricating high-performance heterostructures photodetectors.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
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IF 5.774
Yu-qiong Gao,Jin-qiang Zhou,Jia Zhang,Cong Li,Nai-yun Gao,Da-qiang Yin
The pollution of aquatic bodies in the natural environment by pharmaceuticals has become a matter of increasing concern. In this study, we investigated the effects of the various influencing factors on the degradation of phenacetin (PNT) and its disinfection byproduct formation potentials (DBPFPs) by UV/persulfate (UV/PS) treatment. We first examined the effects of factors such as the PS concentration, pH, HCO 3 – , NO 3 – , NO 2 – , and natural organic matter (NOM) on the PNT degradation kinetics. The PNT degradation rate exhibited a positive correlation with the PS concentration. The PNT degradation rate was also pH-dependent, and it was highest under mild-alkalinity conditions. The presence of NO 3 – , NO 2 – , and NOM all inhibited PNT degradation, whereas HCO 3 – slightly accelerated PNT degradation. We next adopted LC/MS/MS to identify the degradation products of PNT, and the possible degradation pathways were proposed accordingly. The effects of UV/PS pretreatment on the DBPs from chlorination exhibit a close relationship with the abovementioned factors influencing the PNT degradation performance. Upon prolonging the pretreatment time and increasing the PS concentration, it was observed that trichloromethane (TCM) formation continuously decreased, while dichloroacetonitrile (DCAN) and trichloronitromethane (TCNM) exhibited patterns of increase and subsequent decrease in concentration. Mild alkalinity enhanced TCM formation and largely restrained DCAN and TCNM formation. Additionally, the presence of NOM enhanced TCM formation, while HCO 3 – hardly affected DBP formation. Meanwhile, NO 2 – profoundly affected the formation of TCNM. Therefore, these factors influencing PNT degradation by UV/PS should be carefully considered when integrating such technology as an alternative pretreatment for PNT-polluted water before disinfection.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2020
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IF 6.444
Qianfan Zhou,Kunpeng Qian,Jianhui Fang,Miao Miao,Shaomei Cao,Xin Feng
With the mushrooming of smart electronic devices, ultrathin Ti 3 C 2 T x MXene based EMI shielding materials with long term durability have aroused much interest. Herein, 2D Ti 3 C 2 T x /g-C 3 N 4 heterojunction films were firstly assembled using cellulose nanofibrils (CNF) as green binder via a solution-based pressured-filtration process. The heterojunction film with Ti 3 C 2 T x /g-C 3 N 4 mass ratio of 5:1 (28.20 µm in thick) exhibited distinguished performance with EMI shielding effectiveness of 42.99 dB in X-band and high tensile strength of 23.85 MPa. Specially, the generation of photo-electrons from g-C 3 N 4 nanosheets reduced TiO 2 into lower valence states under 365 nm UV light-irritation, resulting in lower loss on electrical conductivity as well as EMI shielding performance compared to their unilluminated counterparts. The reduction on TiO 2 offered by the g-C 3 N 4 enables the heterojunction film to be considered as a promising alternative EMI shielding material for future potential applications, because it can run long time just need UV light modulation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Bingqing Wang,Tao Fu,Baohua An,Yong Liu
Sulfate radicals-based advanced oxidation process (SRAOP) has received increasing attention in the wastewater treatment area because sulfate radicals have high redox potential. The key for SRAOP is to develop high efficient catalysts that can effectively and stably activate persulfate (PS) to produce sulfate radicals. Cu 2 O is a good activator of PS and photo-catalyst. However, its catalytic activity is relatively low because of the poor stability and the recombination of electron and holes. In theory, Cu 0 can reduce Cu 2+ to form Cu + , which can decrease the recombination of electron and holes from the Cu 2 O by the formation of heterojunction. In this study, Cu 0 -Cu 2 O was synthesized by a simple ball-milling method. The as-prepared Cu 0 -Cu 2 O was characterized and used to activate PS for sulfamerazine (SMZ) degradation by means of UV illumination. In the Cu 0 -Cu 2 O/PS/UV system, the removals of 100% SMZ and 30% TOC within 30 min were achieved, respectively, and the removal efficiency of SMZ decreased by only 12.2% after 5 cycles. The high efficiency and good catalytic stability of Cu 0 -Cu 2 O for the activation of PS were due to that Cu 0 and photo-induced electron of Cu 2 O promoted the conversion of Cu 2+ to Cu + . Quenching experiments demonstrated that the hydroxyl radicals and sulfate radicals contributed to SMZ degradation. However, the concentrations and fractions of radicals was affected by the initial pH of solution. Nine intermediate products were identified, and the degradation pathways were proposed, including the fission of sulfur and nitrogen bond, the oxidation of methyl group and the hydroxylation of benzene ring. The effects of initial pH, PS concentration, Cu 0 -Cu 2 O dosage and SMZ initial concentration on the degradation of SMZ were investigated. This study provided an effective catalyst that could simultaneously activate PS and utilize UV to form photo-induced electron, which could enhance the degradation and mineralization of organic pollutants.
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Nanoscale Advances
·
2020
·Vol. 2
·期 3
·1333-1339
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IF 0
Ye Zhang,Qi You,Weichun Huang,Lanping Hu,Jianfeng Ju,Yanqi Ge,Han Zhang
It is widely known that the excellent intrinsic electronic and optoelectronic advantages of bismuthene and tellurene make them attractive for applications in transistors and logic and optoelectronic devices. However, their poor optoelectronic performances, such as photocurrent density and photoresponsivity, under ambient conditions severely hinder their practical application. To satisfy the demand of high-performance optoelectronic devices and topological insulators, bismuth telluride nanoplates (Bi2Te3 NPs) with different sizes, successfully synthesized by a solvothermal approach have been, for the first time, employed to fabricate a working electrode for photoelectrochemical (PEC)-type photodetection. It is demonstrated that the as-prepared Bi2Te3 NP-based photodetectors exhibit remarkably improved photocurrent density, enhanced photoresponsivity, and faster response time and recovery time in the UV-Vis region, compared to bismuthene and tellurene-based photodetectors. Additionally, the PEC stability measurements show that Bi2Te3 NPs have a comparable long-term stability for on/off switching behaviour for the bismuthene and tellurene-based photodetectors. Therefore, it is anticipated that the present work can provide fundamental acknowledgement of the optoelectronic performance of a PEC-type Bi2Te3 NP-based photodetector, shedding light on new designs of high-performance topological insulator-based optoelectronic devices.
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PubMed
CHEMOSPHERE
·
2020
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IF 5.778
Ruihan Xiong,Zhuojun Lu,Qian Tang,Xueling Huang,Huazhen Ruan,Wei Jiang,Yiqun Chen,Zizheng Liu,Jianxiong Kang,Dongqi Liu
This study reports on the propranolol (PRO) degradation performance and product toxicity of an ultraviolet light-emitting diode (UV-LED)/chlorine process. The effects of experimental parameters including solution pH, chlorine dosage, and water matrix constituents on PRO removal were evaluated. Up to 94.5% of PRO could be eliminated within 15 min at a PRO-to-chlorine molar ratio of 1:4. The overall removal efficiency of PRO was non-pH dependent in the range of 5–9, while the initial rate was accelerated under alkaline conditions. The presence of Cl − /HCO 3 − had little influence on the PRO degradation, whereas either humic acid or NO 3 − had an obvious inhibitory effect. Radical scavenger experiments showed that both HO and Cl primarily contributed to the PRO degradation, and electron paramagnetic resonance data demonstrated the generation of 1 O 2 . The transformation of PRO during this process led to five detected products, which exhibited a higher acute toxicity than the parent compound according to the bright luminescent bacillus T3 method. It is worth mentioning that under the same ultraviolet illumination intensity, the degradation of PRO under UV-LED/chlorine gave a better performance than UV 254 /chlorine, but the EEO of the former is obviously higher than the latter. So further research is required on improving the electric current to photon conversion efficiency for UV-LED. Additionally, the UV-LED/chlorine system was effective in the degradation of other drugs including sulfamethoxazole, oxytetracycline hydrochloride, and gatifloxacin, suggesting the possible application of the UV-LED/chlorine process for the removal of pharmaceuticals during wastewater treatment .
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 7
·51634
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IF 3.125
Xianghui Dai,Xia Yu,Jian Zheng,Xiaoxu Yang,Jianjun Pan,Xiaoting Zhang,Jie Min
The resorcinol diglycidyl acrylate (RDA) is firmly introduced to the surface of polyester (PET) fibers by a simple dip-rolling and baking method, and a free radical polymerization reaction is initiated on the surface of PET fabrics under ultraviolet light (UV) light to obtain three hydrogel layers with different structure, including polyacrylamide (PAAM), polyacrylic acid (PAAC) and poly-N-isopropylacrylamide (PNIPAAM). It is shown that the pretreatment-UV grafting method can be used to obtain hydrogel layers with porous structure on the surface of PET fabric, and all three hydrogel layers have better frictional properties than kelp. Among them, the friction coefficient of PET-PAAM surface can reach 0.02, which is 17% of the friction coefficient of kelp surface and 83% lower than that of the untreated PET fabric surface, giving the PET fabric surface excellent interfacial drag reduction characteristics. It can be applied to the surface of underwater activity equipment as well as ships to improve moving efficiency and reduce energy consumption.
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MACROMOLECULAR BIOSCIENCE
·
2021
·Vol. 21
·期 11
·2100189
·
IF 4.979
Xiao-Pei Li,Lin Zou,Oluwatosin David Abodunrin,Xiao-Wei Wang,Ning-Ping Huang
Three-dimensional (3D) cell culture using hydrogel scaffolds can closely resemble the natural extracellular matrix (ECM), which offers appropriate mechanical support for cells and regulates cellular behavior. In this study, a bacterial transpeptidase sortase A (SA) is used to prepare enzymatically cross-linked methacrylated hyaluronic acid (HA) peptides (HAMA-P) hydrogel, which reveals fast gel kinetics under high SA cross-linking concentrations and can be used as an injection hydrogel for tissue repair or extrusive 3D bioprinting. Furthermore, methacrylated gelatin (GelMA) is introduced to build the hybrid hydrogel (HAMA-P-GelMA) with double cross-linking of enzyme-UV, which has shown proper physical properties (mechanical properties, swelling, degradation rate, etc.) of the hydrogel matrix, and displayed desirable effects on cell viability, adhesion, and cell spreading, when compared to GelMA or HAMA-P single-network hydrogels. The HAMA-P-GelMA hybrid hydrogels provide a favorable 3D milieu for cell growth and can be used as a 3D bio-ink or a carrier of stem cells/cytokines for injectable tissue repair and filling.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 4
·51561
·
IF 3.125
Zengshe Liu,Daniel A. Knetzer,Jifu Wang,Fuxiang Chu,Chuanwei Lu,Paul D. Calvert
In this research, a 3D printing technique was employed for processing biobased composites of polyacrylated epoxidized soybean oil (AESO) with modified ethyl cellulose macromonomer (ECM). In this 3D printing process, objects are built in a layer-by-layer fashion by depositing formulated liquid solutions on a platform and rapidly transformed into a solid film cured by UV light. The sustainable materials consisting of ECM and AESO biopolymer were examined for their physical and thermal properties. Samples with different ECM and AESO weight ratios were prepared. Tensile test results showed the ECM-AESO composites had higher strength and stiffness than AESO alone. Their tensile strengths with ECM weight contents from 30 wt.% to 5 wt.% are between 11.5 MPa and 5.9 MPa and Young's moduli are between 167 MPa and 56 MPa, compared to AESO polymer itself with 4.3 MPa and 27.4 MPa, respectively. Further, the glass transition temperatures of all ECM-AESO composites were increased from 57.4 to 82.2°C, compared to AESO polymer itself with 47.1°C. Thermal properties of the ECM-AESO composites are stable up to 325°C. These materials may be of great environmental interest because these composites consist of high amounts of agricultural resources.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Zhuozhi Ouyang,Shuxing Li,Manyi Zhao,Quzong Wangmu,Rui Ding,Chuanqi Xiao,Xuetao Guo
Microplastics (MPs) experienced different aging processes in environment. Literatures about effect of artificially-accelerated aging on MPs behavior are still insufficient. The accelerated process induced by ultraviolet(UV)-activated persulfate (PS) is a promising technology for obtaining different aged MPs to understand long-term aging behavior. In the work, the aging behavior of polyvinyl chloride (PVC) accelerated by UV/PS system were investigated. It exhibited a dechlorination with 58.495 ± 6.090 mg/L Cl - release after 35 h UV-activated PS (0.01 M) process. The treatment led to significant alternations on surface morphology and chemical feature of PVC. The crystallinity was increased, and average size was reduced from 154.11 µm to 119.28 µm with aging time. Subsequently, many smaller size particles were produced. Furthermore, the process induced the breaking of backbone. Simultaneously, more oxygen-containing functional groups were identified. The oxidation reaction accelerated by sulfate radical (SO 4 •− ) and reactive oxygen species (ROS) was predominant, which immensely promoted aging process. Sustained high levels of free radical contributed to production of alcohols and carboxylic acids short chain organics. The study explored aging behavior of PVC accelerated by UV/PS system, which could be helpful for understanding environmental behavior and providing further information to assess potential risks of MPs.
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高影响因子
危险品化学品经营许可证（带存储）