ENVIRONMENTAL POLLUTION
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2023
·
IF 8.9
Xiaolong Yu,Xu Jin,Meng Li,Yuanyuan Yu,Hang Liu,Rujin Zhou,Aiguo Yin,Junyi Shi,Jianteng Sun,Lizhong Zhu
Recently, sodium percarbonate (SPC) as a solid substitute for H 2 O 2 has aroused extensive attention in advanced oxidation processes . In current work, the degradation kinetics and mechanisms of antibiotic sulfamethoxazole (SMX) by ultraviolet (UV) driven SPC system were explored. The removal efficiency of SMX was enhanced as the increasing dosage of SPC. Moreover, hydroxyl radical (•OH), carbonate radical (CO 3 •− ) and superoxide radical (O 2 •− ) were verified to be presented by scavenger experiments and •OH, CO 3 •− exhibited a significant role in SMX degradation. Reactions mediated by these radicals were affected by anions and natural organic matters, implying that an incomplete mineralization of SMX would be ubiquitous. The screening four intermediates and transformation patterns of SMX were verified by DFT analysis. Metabolomic analysis demonstrated that a decreasing negative effect in E. coli after 24 h exposure was induced by intermediates products. In detail, SMX interfered in some key functional metabolic pathways including carbohydrate metabolism , pentose and glucuronate metabolism, nucleotide metabolism, arginine and proline metabolism, sphingolipid metabolism, which were mitigated after UV/SPC oxidation treatment, suggesting a declining environmental risk of SMX. This work provided new insights into biological impacts of SMX and its transformation products and vital guidance for SMX pollution control using UV/SPC technology .
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Dongdong Liu,Xiuming Liu,Kuanjun Fang,Jixian Gong,Shuai Zhang,Xiran Qiao,Jinkun Wang,Tianning Wang,Enzheng Xing
The use of auxiliaries for textile dyeing and printing and the release of residual dyeing liquor cause enormous harm to the environment, while the single function of dyed fabrics hinders their development in more advanced fields. In this work, zeolitic imidazolate framework-8 (ZIF-8) nanocrystals were grown in situ on carboxymethyl cotton fabric to absorb acid dyes without auxiliaries. To further improve its durability and color fastness, polymethylhydrosiloxane (PMHS) hydrophobic coating was used to protect its surface. The as-prepared cotton fabrics exhibited a K/S value of 21.78, a hydrophobic angle of 160.2° and a UPF value close to 50+. They showed high stability under various environmental conditions, which provided a simple and enviromental way to prepare multifunctional dyed textiles. The high hydrophobic angle of the fabric offered excellent adsorption of oil agent in the oil–water mixture, and the oil–water separation efficiency can still reach more than 95% even after 20 cycles, indicating that the fabric also had promising applications in the treatment of oiled wastewater.
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CHEMOSPHERE
·
2019
·
IF 5.108
Ruijie Xie,Gaoyuan Liu,Dingping Liu,Shimin Liang,Dongxue Lei,Hanying Dong,Haibao Huang,Dennis Y.C. Leung
The traditional treatment processes for volatile organic compounds (VOCs) removal generally suffered several disadvantages, such as secondary air-pollutants. To overcome these issues, wet scrubber coupled with heterogeneous UV/Fenton was developed for gaseous VOCs (i.e. toluene) removal. ZSM-5 supported iron oxide (Fe/ZSM-5) was prepared as a multifunctional catalyst for activation of H 2 O 2 and enhancement of gas-liquid mass transfer. Toluene was removed efficiently by this coupled process with the removal efficiency of 85% during 120 min. Many intermediates were detected in the solution by GC-MS while no intermediates were observed in the outlet gas, suggesting that wet scrubber coupled with heterogeneous UV/Fenton could significantly reduce secondary air pollutants . The possible mechanism of toluene oxidation was proposed including the physical adsorption by Fe/ZSM-5 and OH oxidation. This study provides an environmentally benign and highly efficient chemical scrubbing process for gaseous VOCs removal.
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WATER RESEARCH
·
2019
·
IF 7.913
Shuhui Sun,Shu Wang,Yuxuan Ye,Bingcai Pan
Considerable amount of phosphorous is present as organic phosphonates (usually in the form of metal complexes, e.g., Ca(II)-phosphonate) in domestic and industrial effluents , which cannot be effectively removed by traditional processes for phosphate. Herein, we employed a proprietary process, i.e., Fe(III) displacement/UV irradiation/co-precipitation (denoted Fe(III)/UV/NaOH), to enable an efficient removal of Ca(II)-phosphonate complexes from water. The combined process includes three basic steps, i.e., Fe(III) replacement with the complexed Ca(II) to form Fe(III)-phosphonate of high photo-reactivity, UV-mediated degradation of Fe(III)-phosphonate to form phosphate and other intermediates, and the final phosphorous removal via co-precipitation at pH = 6. The operational conditions for the combined process to remove a typical phosphonate Ca(II)-NTMP (nitrilotrismethylenephosphonate) are optimized, where ∼60% NTMP is transformed to phosphate with the total phosphorous reduction from 1.81 mg/L to 0.17 mg/L. Under UV irradiation, the cleavage of NTMP is identified at the C-N and C-P bonds to form the intermediate products and phosphate in sequence. Also, the combined process is employed for treatment of two authentic effluents before and after activated sludge treatment, resulting in the phosphorous drop from 4.3 mg/L to 0.23 mg/L and from 0.90 mg/L to 0.14 mg/L respectively, which is much superior to other processes including Fenton/co-precipitation. In general, the combined process exhibits great potential for efficient removal of phosphonates from contaminated waters .
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Qi Qiang,Jiaxiang Qin,Yi Ma,Zenglin Wang,Chuan Zhao
Fabrication of stable and functional patterns on the surface of PTFE remains a great technical challenge owing to its inertness and high hydrophobicity. Here, we report for the first time the fabrication of functional micropatterns on the PTFE surface by selectively irradiating plasma-treated PTFE coated with the monomer solution. A series of uniform highly dense poly(dopamine methacrylamide) (denoted as PDMA) line patterns with line/pitch widths of 20/20 and 50/50 μm are fabricated on the surface of PTFE (denoted as PDMA-p/PTFE) using dopamine methacrylamide (DMA) as the monomer. Surface graft copolymerization occurs and is attributed to the universal adsorption of DMA and the low grafting energy barrier, compared with the polymerization energy barrier, which is also demonstrated by the DFT calculations. Further, robust well-defined metal Ag or Cu patterns with strong adhesion strength are fabricated on the surface of the PTFE film by electroless deposition and are demonstrated for applications in flexible electronics. The approach is demonstrated to be versatile for fabrication of PDMA micropatterns onto a wide range of polymeric substrates, including polypropylene and acrylonitrile butadiene styrene.
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REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Lin Guan,Yongqi Yang,Fei Jia,Guanghui Gao
Photochromic hydrogels have attracted considerable attention owing to their potential application in optical devices. However, the weak mechanical properties severely limited their applications. Here, a novel photochromic hydrogel with high transparency, high stretchability and rapid photochromic responsiveness has been successfully designed and prepared by introducing a redox photochromic material (Mo) into the hybrid hydrogel. The photochromic hydrogel with rapid photochromic response achieved discoloration process within only 3 s and the fading process could be easily performed under the air environment. Moreover, the ability to rewrite and erase optical information have been implemented on the photochromic hydrogels. Therefore, this strategy of photochromic hydrogel would contribute to design a new generation of optical display devices.
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IONICS
·
2018
·Vol. 25
·期 4
·1607-1615
·
IF 2.347
Lu Yang,He Ke-Wu,Zhang Shu-Jian,Zhou Yu-Xiang,Wang Zhen-Bo
An all-solid-state polymer electrolyte has been prepared by polymerizing a monomer ethoxylated trimethylolpropane triacrylate (ETPTA) using ultraviolet irradiation (UV-curing) into crystal electrolyte (referred to as UV-PCCE) in this paper, which has the merit of outstanding interfacial compatibility with electrode materials. Otherwise, on account of the appearance of a unique plastic-crystalline phase, this polymer electrolyte presents a great electrochemical window (4.78 V vs Li/Li + ) and a high ionic conductivity at ambient temperature. The cell of LiFePO 4 /UV-PCCE/Li displays a high initial discharge capacity of 147.1 mAh g −1 at 0.5 C and 118.0 mAh g −1 at a rate of 8.0 C at room temperature. At the same time, it may deliver a high initial discharge capacity of 150.0 mAh g −1 and the coulombic efficiency approximate 100% over 120 cycles at 2.0 C at 55 °C. Its superior performances demonstrate that the UV-PCCE-based electrolyte via an ultraviolet irradiation is applied to the actual, which can be used for high-performance lithium-ion batteries. This technology can also be compatible with existing lithium-ion battery equipment.
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RSC Advances
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2019
·Vol. 9
·期 1
·450-459
·
IF 3.049
Zhikai Wei,Peng Li,Muhammad Hassan,Pu Wang,Cong Xu,Long-Fei Ren,Yiliang He
Photovoltaic wastewater contains a large amount of thiourea that cannot be directly treated by biological methods because of its biotoxicity. In this study, a novel O3/H2O2 + BiPO4/UV synergy technique was used as a pre-treatment process to degrade thiourea. The effects of H2O2 and catalyst loading were investigated, and the transformation pathway of thiourea was predicted based on the intermediates detected by UPLC-Vion-IMS-QToF. The synergy technique degraded 89.14% thiourea within only 30 min, and complete degradation occurred after 150 min. The TOC removal of O3/H2O2 + BiPO4/UV was 1.8, 1.5, and 1.9 times that of O3/H2O2 and BiPO4/UV/H2O2 single processes and O3/H2O2 + UV process, respectively, which was due to the synergy between H2O2 residues and BiPO4. In addition, thiourea was mainly degraded by ·OH into thiourea dioxide and melamine (polymerized by other intermediates) and then further degraded into biuret and methyl carbamate by the holes of BiPO4, followed by complete mineralization into H2O and CO2. These results confirm that the O3/H2O2 + BiPO4/UV synergy technique is a promising option for the degradation of thiourea.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 17
·47428
·
IF 1.901
Zhihao Liang,Xiaomei Wang,Liangting Feng,Xuefen Wu
A novel solder resist ink for inkjet printing containing the ultraviolet (UV) and thermal dual curing oligomer is introduced in this work. Three kinds of acrylic monomers for the synthesis of the oligomer are successful prepared and their structures are determined by Fourier transfer infrared. Both UV curing process and thermostability are monitored under UV differential scanning calorimetry and thermogravimetric analysis. For the photoreaction process, the oligomer using Lauryl methacrylate as the material of copolymerization possesses the highest reactivity and conversion of carbon–carbon double bond. Besides, this kind of oligomer also owns excellent thermostability, just losing 5.9% of its weight at 288 °C. The solder resist inks containing the oligomers and jetting by the inkjet printer are tested with the adhesion, soldering resistance, and other performances, presenting the outstanding heat resistance and wide application prospects. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47428.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 7
·5877-5897
·
IF 2.993
Zhang Jiancheng,Li Liping,Guo Ruilu,Zhou Haorui,Li Zhiming,Chen Guangxin,Zhou Zheng,Li Qifang
Methacryloxypropyl-polyhedral oligomeric silsesquioxane (MAP-POSS) was photopolymerized with the tri- or tetra-functional thiol monomer in different stoichiometry. A novel inorganic–organic methacrylate hybrid material with highly cross-linked network and high performance was synthesized by UV-initiated thiol–ene click chemistry. SEM–EDAX images and XRD diffractograms showed that no agglomeration of MAP-POSS was observed, indicating MAP-POSS dispersed uniformly in the hybrid materials. Real-time FTIR was employed to monitor the conversion of thiol and methacrylate as a function of irradiation time, and the results revealed that highly thiolated monomer could promote the conversion of methacrylate effectively because of stronger chain propagation capability. The TGA indicated that the hybrid materials had high thermal stability of which the onset decomposition temperature rose to 350 °C, approximately 50 °C higher than that of the traditional UV-cured epoxy acrylate/triethylene glycol dimethacrylate (EA/TEGDMA, 70:30 w/w) resin. The highest glass transition temperature ( T g ) of the hybrid materials was 76.2 °C. Compared with traditional EA/TEGDMA resins, the novel hybrid materials consisted of MAP-POSS had fast curing rate, high mechanical properties and thermal stability which made the wider practical applications of UV-cured hybrid materials feasible.
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PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Daidong Wei,Bing Liao,Jianheng Huang,Min Zhang,Hao Pang
Thiol-ene click reactions are more oxygen tolerant alternative to the conventional (meth)acrylate chemistry that is frequently used for the rapid production of photopolymerized networks with numerous desirable properties. To attain a high curing efficiency while maintaining the advantages of thiol-ene systems, a castor oil-based hyperbranched urethane acrylate was employed in this work as a primary oligomer for UV-curable coating formulation. Subsequently, a tetrathiol monomer (PETMP) was introduced into the coating formulation to obtain a thiol-ene system. The effects of PETMP loadings on the UV-curing kinetics and final polymer properties were systematically investigated. Consequently, thiol-ene based films with excellent flexibility and water resistance were obtained as a result of the high efficient thiol-ene photopolymerization. The double bond conversion of the thiol-ene system was found to increase with the addition of more PETMP. Impressively, with the incorporation of 5 wt% PETMP, the resultant UV-cured film had the best acid resistance and exhibited a double bond conversion of 93.6%, a pencil hardness of 6H, a water absorption of 0.76%. Additionally, all of the prepared films were completely transparent and possessed good microstructures. These thiol-ene based films may provide insight into the preparation of high-performance UV-curable coatings with excellent flexibility.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Jue Yu,Lan Li,Yong Qian,Hongming Lou,Dongjie Yang,Xueqing Qiu
Lignosulfonate (LS), one type of industrial lignin and natural macromolecular sun blocker, was applied to modify TiO2 via one-pot hydrothermal esterification. The reaction mechanism and composite structure of LS@TiO2 were investigated by DLS, TEM, AFM, TG, UV, FTIR, XPS, XRD, ESR, and contact angle measurements. The results show that the esterification modification occurred between the carboxyl groups of lignin and the hydroxyl groups on the surface of TiO2. Lignosulfonate of 3.4 wt % with a thickness of 13 nm effectively coated the normal TiO2, and the LS@TiO2 composites were nanoscale with an average size of 119 nm. Hydroxylated TiO2 particles were more reactive, and the contents of LS on TiO2 were processed by 0.1 and 1 M HCl and increased to 5.0 wt % (LS@TiO2-0.1M) and 6.0 wt % (LS@TiO2-1M), respectively. Chemically coated LS not only improved the dispersibility of TiO2 in the substrates, but also significantly boosted its UV-blocking ability. Therefore, TiO2@LS nanocomposites were applied as the sole active in the pure cream and the sunscreen performance was compared with that of TiO2. The sun protection factor (SPF) values of creams containing 5, 10, and 20 wt % LS@TiO2 were 16, 26, and 48, respectively. They were 30–60% higher than those of the creams containing the same amount of TiO2. The sunscreen performance of LS@TiO2 improved with LS content. The SPF value of pure cream containing 10 wt % LS@TiO2-1M reached 50+. The possible UV-blocking enhancement mechanism of LS@TiO2 was also revealed. Preparation of LS@TiO2 nanocomposites provides a facile and green way for value-added utilization of lignin biomass and highly efficient UV-blocking of nano-TiO2 materials.
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