SURFACE & COATINGS TECHNOLOGY
·
2019
·
IF 3.192
Kai An,Cai Long,Yi Sui,Yongquan Qing,Guangzhen Zhao,Zhenqiang An,Linshan Wang,Changsheng Liu
Superhydrophobic coatings have been developed widely, because of their self-cleaning, anti-fouling, and anti-icing properties. However, there are critical challenges in terms of poor durability in harsh environments. Herein, we report an effective and simple strategy for large-scale fabrication of durable superhydrophobic composite coating , based on polydimethylsiloxane filled with fluoroalkyl silane functionalized cerium dioxide . The obtained composite coating showed satisfactory water repellency with water contact angle of 161 ± 2° and sliding angle of 4 ± 1°, mainly attributed to the construction of multilevel micro/nano scale structure. Such coatings possessed outstanding chemical stability, self-cleaning property, and adhesion strength . Notably, the coating was UV resistant and mechanically robust, which could also retain good superhydrophobicity after 240 h of UV irradiation, 30 abrasion cycles, and scratching, and could be applied to a variety of substrate surfaces. In addition, according to electrochemical test results, the superhydrophobic composite coating showed excellent corrosion barrier and active corrosion inhibition effect, due to synergy between trapped air films and cerium dioxide. These multiple key properties integrated into our superhydrophobic composite coating are expected to provide a wide range of applications in various extreme outdoor environments.
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高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2019
·Vol. 304
·期 4
·1800685
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IF 3.038
Haikun Zhu,Lijuan Chen,Chong Zhang,Muhammad Atif,Kai Gong,Chaoshi Chen,Yanmei Wang
A series of the copolymer, poly(styrene-random-glycidyl methacrylate) (P(St-r-GMA)), is synthesized by free radical polymerization, and characterized by 1 H NMR spectroscopy and gel permeation chromatography. The various substrates are then modified by P(St-r-GMA) under ultraviolet (UV) irradiation. Subsequently, the poly(2-methyl-2-oxazoline) (PMOXA) based coatings are prepared by anchoring amino-terminated PMOXA onto the P(St-r-GMA) modified surfaces through the reaction between the amino group of PMOXA and epoxy group of P(St-r-GMA). The results of ellipsometry, X-ray photoelectron spectroscopy, atomic force microscopy, and water contact angle reveal that PMOXA-based coatings can be prepared successfully on the substrates through UV-crosslinked P(St-r-GMA) as anchoring coatings. Besides, the PMOXA-based coatings display not only a superior antifouling property but long-term stability as well. Furthermore, the location of the coating formed on the substrate can be well controlled through selecting the site of UV irradiation, which can be utilized for the selectivity of protein adsorption (or resistance) on special devices.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Hao Yang,Ping He,Henglun Cheng,Baoqing Shentu
To promote the anti-aging performance of thermoplastic vulcanizates (TPVs) versus ultraviolet (UV)/O3 exposure, a nano-TiO2-loaded antioxidant (TiO2-KH570-MB) was prepared by a thiol–ene reaction between 2-mercaptobenzimidazole (MB) and modified nano-TiO2 (TiO2-KH570). Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis demonstrated the chemical linkage between MB and modified nano-TiO2, and the loading amount of MB was approximately 5.19 wt %. The contact angle test showed that the surface hydrophobicity of TiO2-KH570-MB was significantly increased due to the immobilization of MB. Scanning electron microscopy revealed that TiO2-KH570-MB was uniformly distributed in the TPV matrix. The anti-aging property of TPV compounds was tested in the device with high-intensity ultraviolet radiation and high-concentration ozone. The effects of UV/O3 comprehensive aging on the TPV compounds were evaluated by means of the variations of surface morphology, tensile test, hardness, gel content, and carbonyl index with aging time. On the basis of the aging behavior, we concluded that TPV/TiO2-KH570-MB exhibited excellent stability against UV/O3 aging, due to the homogeneous dispersion, low level of migration, and low volatility of TiO2-KH570-MB.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Tiansheng Chen,Jingshuai Ma,Qianxin Zhang,Zhijie Xie,Yongqin Zeng,Ruobai Li,Haijin Liu,Yang Liu,Wenying Lv,Guoguang Liu
Contamination with β-blockers such as propranolol (PRO) poses a potential threat to human health and ecological system. The present study investigated the kinetics and mechanisms of PRO degradation by UV-activated persulfate (UV/PS) oxidation. Here, the experimental results showed that the degradation of PRO followed pseudo-first-order reaction kinetics, the degradation rate constant ( k obs ) was increased dramatically with increasing PS dosage or decreasing initial PRO concentration. And increasing the initial solution pH could also enhance the degradation efficiency of PRO. Radical scavenging experiments demonstrated that the main radical species was sulfate radicals (SO 4 •− ), with hydroxyl radicals (HO·) playing a less important role. Meanwhile, the second-order rate constants of PRO degradation with SO 4 •− and HO· were determined to be 1.94 × 10 10 M −1 s −1 and 6.77 × 10 9 M −1 s −1 , respectively. In addition, the presence of natural organic matter (NOM) and nitrate anion (NO 3 − ) showed inhibitory effect on PRO degradation, whereas bicarbonate anion (HCO 3 − ) and chlorine anion (Cl − ) greatly enhanced the degradation of PRO. Moreover, the transformation products of PRO were identified by applying ultra performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UPLC/Q-TOF-MS) technique. Molecular orbital calculations were used to estimate the reaction site of PRO with radicals, simultaneously. Hence, the transformation pathways including hydroxylation, dehydration, naphthalene ring opening, and the cleavage of aldehyde groups were proposed. This work enriches the mechanism of PRO degradation under UV/PS system on the basis of results obtained by experimental characterization and Gaussian theoretical calculation.
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PubMed
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 23
·6681-6690
·
IF 5.726
Jie Wang,Zhenyu Ge,Linjuan Pei,Peng Kong,Ruiyi Wang,Pengqi Zhu,Meixian Liu,Xianmo Gu,Zhanfeng Zheng
A high aniline yield was achieved by the combination of near-UV light as the driving force of nitrobenzene reduction and a ZnNb2O6 surface as the product-selective controller. Here, a ZnNb2O6 fibre, having a wide band gap and both acidic and basic sites, was exploited by a novel ion-exchange method to study the effect of the surface acidity and basicity of catalysts on the product selectivity under near-UV light irradiation without the interference of photo-generated carriers. ZnNb2O6 showed the highest aniline yield compared to Nb2O5 and ZnO. The results of experimental and theoretical calculations confirmed that the acidic sites on the surface of ZnNb2O6 promoted the breakage of the N–O bond in the intermediate phenylhydroxylamine while the basic sites were attached to the dissociated hydrogen of isopropyl alcohol, resulting in high aniline selectivity.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
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IF 3.927
Huiming Xiang,Yisheng Shao,Naiyun Gao,Xian Lu,Na An,Chaoqun Tan,Zhaofang Zheng
The degradation of diuron by chlorination and UV/chlorine process and the formation of disinfection by-products (DBPs) was investigated in this study. The degradation of diuron followed the pseudo first-order kinetics model. In UV/chlorine process, hydroxyl radical were proved to provide more contribution in the oxidation. The degradation kinetics increased with the increasing of chlorine dosage and the decreasing of natural organic matter (NOM) dosage. However, the degradation pathways were defined using high performance liquid chromatography coupled with a TSQ Quantum quadrupole mass spectrometer (HPLC-ESI/MS). The formation of DBPs after chlorination and chloramination was defined using gas chromatography with elect ion capture detector (GC-ECD) and gas chromatography–mass spectrometer (GC–MS). Several kinds of DBPs including chloroform (TCM), 1,1-dichloroacetone (1,1-DCP), 1,1,1-trichloroacetone (1,1,1-TCP), trichloronitromethane (TCNM), dichloroacetamide (DCAcAm) and trichloroacetamide (TCAcAm) was identified in this study.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Kunlin Chen,Jianlin Zhou,Fangqing Ge,Run Zhao,Chaoxia Wang
Fabrication of smart fabrics using a simple and scalable method is a big challenge, and this paper is aimed at developing a facile approach for the preparation of smart fabric coatings. The coating was formed on the fabric using pH-responsive polyurethane (pH-PU) and fluorated octavinyl polyhedral oligomeric silsesquioxane (F-OV-POSS) by UV curing. These obtained fabric coatings exhibited durable superhydrophobicity and self-cleaning ability even under some harsh environments, such as mechanically damaged, seawater and UV-irradiation. Due to the protonation and deprotonation of the pH-PU along with the changing of pH value, the wettability of fabric coating could be changed between the superhydrophobicity and underwater superoleophobicity by regulating pH value, and oil or water is able to be separated from an oil/water mixture. In addition, the damaged fabric coatings could restore their special wettability through simply heating, because fluorocarbon chains of F-OV-POSS in the coatings easily migrated to the outer surface of coatings. It is expected that this smart self-healing fabric coating with durable self-cleaning and oil/water separating performance would be a good case for practical applications in energy saving and sustainable development.
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SURFACE & COATINGS TECHNOLOGY
·
2018
·
IF 2.906
Guangming Pan,Xinyan Xiao,Zhihao Ye
A durable and stable polydimethylsiloxane (PDMS) - copper stearate (CuSA 2 ) superhydrophobic coating has been fabricated on cotton fabric by a simple in-situ growth and dip-coating method. The surface morphology , roughness and composition of the superhydrophobic coating were analyzed by SEM, 3D optical profiler and FT-IR, respectively. The prepared cotton fabric (C-fabric) showed good superhydrophobicity (WCA ~ 158°) and a satisfactory chemical stability against strong acidic/alkali solution and various solvents. The C-fabric retained superhydrophobicity with WCA above 150° after 24 h ultraviolet (UV) irradiation, 10 times of mechanical abrasion and 12 h ultra-sonication treatment. The obtained C-fabric also possessed anti-fouling property for various common household liquids (coke, juice, tea, ink, coffee and milk) with CA above 144°. Furthermore, the C-fabric can be applied to the separation of oil/water mixture with separation efficiency of more than 96%.
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高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Lingfei Ma,Chaoyi Wang,Haipu Li,Fangyuan Peng,Zhaoguang Yang
Geosmin (GSM) and 2-methylisoborneol (2-MIB) are two common odor compounds in drinking water . In this paper, the performance of UV/chlorine was compared with that of chlorine and UV to degrade GSM (100 ng L −1 ) and 2-MIB (100 ng L −1 ) in water. UV/chlorine was further exploited, and a steady-state kinetic model was used to conduct a detailed study on efficiency, rate, reactive species and pathway. The results showed that UV/chlorine greatly could improve the removal ratio to 90% within 5 min, from approximately 20% with only UV or dark chlorine in 60 min. The removal ratio and rate depended on UV light intensity , free chlorine dosage, reaction time and water quality parameters (e.g. pH, concentrations of HCO 3 − and Cl − ). Among these factors, the first two obviously could accelerate the rate and increase the ratio. The degradation was also significantly improved in an acidic condition, while alkaline conditions and HCO 3 − had inhibitory effects, and Cl − created no difference. Contributions of OH and Cl to the degradation of 2-MIB and GSM were further revealed, and OH was found to be the most important reactive species. In the UV/chlorine process, 6 degradation byproducts of 2-MIB, including 1 alcohol, 2 ketones, and 3 olefins , were identified, and 14 degradation byproducts of GSM, including 6 ketones, 1 aldehyde, 2 alcohols, 3 naphthenes , and 2 olefins, were found by using solid-phase microextraction coupled to gas chromatography-mass spectrometry. The possible degradation pathways of GSM and 2-MIB in UV/chlorine thus were proposed.
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PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2018
·
IF 2.955
Fei Rao,Yuhe Chen,Xiping Zhao,Hanjiang Cai,Neng Li,Yongjie Bao
Benzotriazole (BTZ), benzophenone (BP), nano-TiO 2 (NTiO 2 ), and nano-ZnO (NZnO) are potential components of UV protection coatings due to being UV light absorbers. Herein, the UV-protective effects of four acrylic coatings containing individual organic and inorganic UV light absorbers and another four coatings containing both types of absorbers were determined by employing accelerated bamboo aging tests. Although organic absorbers decomposed during aging, their degradation rate decreased in the presence of inorganic absorbers. Moreover, individual organic absorbers were better suited for color stabilization than inorganic ones, with the best bamboo surface photostability enhancement achieved by BTZ-containing coatings (BTZ, BTZ-NZnO, and BTZ-NTiO 2 ). Furthermore, strong synergistic effects were detected for BTZ-NZnO and BTZ-NTiO 2 , whereas an antagonistic effect was observed for BP-NTiO 2 and BP-NZnO. Thus, combinations of organic and inorganic UV light absorbers efficiently inhibited the degradation of the former, with the performance of clear coatings determined by the type of the organic absorber.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Shaolong Yang,Zhitao Han,Xinxiang Pan,Bojun Liu,Dongsheng Zhao
UV/chlorine has attracted much attention in flue gas and water treatment fields in recent years. However, only a few studies highlighted gas pollutants removal performance of UV/chlorine method in real water. In this study, nitrogen oxide (NO x ) removal using UV-irradiated electrolyzed seawater (UV/electrolyzed seawater) was explored under simulated seawater environment in a semi-batch photochemical reactor. Comparison experiments between UV/H 2 O 2 and UV/chlorine in both freshwater and seawater systems were performed. Results showed that NO removal efficiency in UV/chlorine freshwater system was higher than those in UV/chlorine seawater system, due to radical scavenging effects of water matrices in seawater. Several strong reactive radicals (e.g., OH, Cl, OCl, ClOH − ) yielded from UV/chlorine system were considered to contribute to NO x removal, among which the role of OH radical was confirmed by radical-trapping experiments. The alkalinity of the seawater adversely impacted contributions of these reactive radicals to NO x removal, which caused a sharp drop in NO x removal efficiencies. Comparatively, the chloride ion in seawater had slight influences on NO x removal efficiencies of UV/electrolyzed seawater. Then, optimization of NO x removal efficiencies against three key variables (active chlorine concentration, UV irradiation dose, and initial pH) was investigated in simulated seawater using Design Expert Software. A regression model of NO x removal efficiency was obtained with satisfactory accuracy. Results indicated that active chlorine concentration and UV irradiation dose significantly influenced NO x removal efficiencies, compared with pH effects. Furthermore, NO x removal mechanisms involved in reactive radicals were discussed for UV/electrolyzed seawater method. Due to pH-dependent characteristics of both active chlorine species and carbonate species in electrolyzed seawater, NO x removal pathways by UV/electrolyzed seawater were different as the environment changed from acid to alkalinity.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2018
·Vol. 26
·期 12
·4311-4320
·
IF 1.971
Wu Chengyi,Zhang Xu,Li Cong,Cheng Chao,Zheng Yin
A novel sodium alginate-grafted poly(acrylic acid)/graphene oxide (NaAlg-g-PAA/GO) composite hydrogel was prepared via ultraviolet irradiation, and characterized by infrared spectroscopy spectrometer. X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. It was employed to adsorb NH 4 + from aqueous solution and used as slow-release nitrogen fertilizers (SNFs). Result indicated that the adsorption process for NH 4 + reached equilibrium within 50 min, with the adsorption capacity of 6.6 mmol g −1 even if 30 wt% GO was incorporated. The results of adsorption kinetic and isotherm were well described by the pseudo-second-order and Freundlich model. The thermodynamics analysis showed the adsorption process was spontaneous. The study indicated excellent water-holding ratio of soil with 2 wt% SNFs was 81.2%, and nitrogen release was up to 55.1% within 40 days in soil. Overall, NaAlg-g-PAA/GO could be considered as an efficient adsorbent for the recovery of nitrogen with the agronomic reuse as a fertilizer.
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