INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
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2023
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IF 1.5
Jialong Zhu,Kaixuan Fang,Mengdi Zhang,Huixuan Chen,Mengfei Zhou,Xiaofang Sun
In this study, the kinetics and mechanism of UV/O 3 synergistic oxidative digestion of dissolved organic phosphorus (DOP) were investigated, focusing on the ozone direct oxidation and hydroxyl radical oxidation parts of glufosinate and triphenyl phosphate (TPhP). The p-chlorobenzoic acid (p-CBA) was selected as the probe compound, and two kinds of reaction kinetic models were proposed by competitive kinetic method with R ct according to the different scale of rate constants of hydroxyl radical oxidation. Under the condition of weakly alkaline (pH = 9.0) and weakly acidic environment (pH = 5.0), the second-order rate constants of glufosinate and TPhP was determined indirectly to be k o 3/glufosinate = (2.903 ± 0.247)M −1 s −1 and k o 3/TPhP = (3.307 ± 0.204) M −1 s −1 by ozone direct oxidation, and k ·OH/glufosinate = (1.257 ± 1.031) × 10 9 M −1 s −1 and k ·OH/TPhP = (7.120 × 10 8 ± 0.963) M −1 s −1 by hydroxyl radical oxidation, respectively. The comparison of the contribution levels of the two parts to the digestion process showed that the contribution levels in the digestion of glufosinate and TPhP processes both the contribution of ·OH were higher than those of ozone, 86.3% and 72.6%, respectively.
研究领域:
环境科学
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化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2022
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IF 8.431
Yingzi Lin,Junjie Chen,Hao Li,Lei Chen,Baoling Yuan,Chunyan Shi,Siwen Li,Gen Liu,Yuefeng Xie
Acid red 73 (AR73) is a representative dye pollutant that poses a threat to the environment and human health. Effectively removing this type of pollutant by conventional processes is difficult. However, this study found that compared with UV/PDS, UV/O 3 , and PDS/O 3 , UV/O 3 /PDS composite system had the highest degradation effect on AR73. The degradation efficiency in the composite system reached 97.61% within 30 min, and the synergistic coefficients in the composite system were all greater than 1. In the UV/O 3 /PDS system, ·OH was the main free radical that mainly degrades AR73. The increase of PDS dosage promoted the degradation of AR73, but the increase of O 3 dosage was difficult to greatly improve the degradation of AR73 effect. The kinetic model of the apparent reaction rate was determined. The UV/O 3 /PDS system can efficiently degrade AR73 in a wide range of substrate concentrations and pH levels, and at the same time showed good adaptability to various concentrations of anions (Cl − , CO 3 2− , SO 3 2− , and C 2 O 4 2− ). Under raw water quality, the degradation effect of AR73 was still as high as approximately 90%. The theoretical attack site was obtained by DFT calculation , and the possible degradation pathway of AR73 was proposed based on the GC-MS spectrum and UV–Vis absorption spectrum . The attack of –N N- by ·OH, SO 4 − , and O 3 was proposed to be the main possible degradation pathway for AR73. Therefore, this study further improves the understanding of the UV/O 3 /PDS system and shows the potential applicability of this system in the treatment of dye wastewater.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Jie Wang,Haibao Liu,Yue Gao,Qinyan Yue,Baoyu Gao,Bo Liu,Kangying Guo,Xing Xu
Advanced oxidation processes (AOPs) such as ozonation and Fenton processes are widely used in the treatment of high-salt wastewater. The UV/O 3 pressurization process was designed and applied at the pilot-scale for treatment of actual high-salt textile wastewater. The UV/O 3 pressurization process achieved the highest decolorization (85 %) and chemical oxygen demand (COD Cr , 43.2 %) removal efficiency at an O 3 dosage of 200 g·t −1 and a pressure of 0.2 MPa. Compared to ordinary ozonation, the UV/O 3 pressurization process improved the solubility and gas-liquid mass transfer efficiency of O 3 in wastewater and generated a large number of O 3 microbubbles. Hydroxyl radical (·OH), superoxide radicals (O 2 · − ) and single oxygen ( 1 O 2 ) all played a significant role on the removal of pollutants in wastewater during the UV/O 3 pressurization process. The reverse osmosis (RO) process was used to evaluate the effect of UV/O 3 pressurization and Fenton pre-oxidation processes on the desalination process as the last process in treating high-salt organic wastewater. The pre-oxidation processes improved the initial RO water flux . Compared with the Fenton process, the UV/O 3 pressurization process had less membrane fouling (thin fouling layer vs thick fouling layer), and final water flux (59.4 LMH) was higher than that of Fenton process (34.9 LHM). The total dissolved solids (TDS), Cl − and SO 4 2− of the effluent from UV/O 3 pressurization process (37.2, 7.6 and 3.0 mg·L −1 ) were better than that of Fenton process (65.7, 13.9 and 7.1 mg·L −1 ). Therefore, the UV/O 3 pressurization process without secondary pollution is more suitable for the advanced treatment of high-salt organic wastewater than the Fenton process.
研究领域:
环境科学
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水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
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2020
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IF 5.778
Jie Wang,Haibao Liu,Defang Ma,Yan Wang,Guangping Yao,Qinyan Yue,Baoyu Gao,Shue Wang,Xing Xu
In this work, the combined ultraviolet ozone process (UV/O 3 ) was applied for organic contaminant (Reactive Blue K-GL, RB) degradation in high salinity . The degradation rates of RB in both O 3 and UV/O 3 systems were enhanced by NaCl (the k increased from 0.080 to 0.116 to 0.132 and 0.267 min −1 respectively), while mineralization rate varied at different salt conditions. In addition, UV irradiation promoted the degradation efficiency of RB with the presence of salt. Singlet oxygen ( 1 O 2 ) was the primary active species in the UV/O 3 system. The quenching experiments and signal intensity of 1 O 2 corresponded well to the mineralization of RB. Under conditions of high salinity and high pH, O 3 has high mass transfer coefficient (k La , 3.303 min −1 ) and self-decomposition (k d , 0.600 min −1 ), which further promoted the formation of 1 O 2 for mineralization of RB. Furthermore, UV/O 3 system was efficient in real textile wastewater treatment (COD Cr removal rate 91.7% and decolorization rate 98.7%).
研究领域:
环境科学
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水处理
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污染物降解
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
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2009
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IF 3.054
Shuang Song,Zhiwu Liu,Zhiqiao He,Yu Li,Jianmeng Chen,Chaolin Li
Biocides usually persist during municipal sewage treatment and are subsequently distributed into aquatic environments. To explore the capability of advanced oxidation processes for the rapid removal of biocides, we examined the total organic carbon (TOC) reduction of 4-chloro-3,5-dimethylphenol (PCMX) with a combination of UV/O 3 . Moreover, the related important parameters, including the mass transfer coefficient and light utilization efficiency, in PCMX degradation were determined. The UV/O 3 experimental results showed a pronounced synergistic effect, leading to the nearly complete elimination of TOC within 75 min. Thus, the effect of operating variables was investigated as a function of pH, ozone dosage, bulk temperature and the initial concentration of PCMX. The efficiency of PCMX mineralization increased with an increase in ozone dose up to 3.1 g h −1 , and a decrease in the initial concentration from 250 to 100 mg L −1 . The optimal pH value was 4.0, and the preferred bulk temperature was 20 °C on the basis of the influence of temperature on reaction rate and ozone solubility. The major aromatic intermediates identified by gas chromatography/mass spectrometry were 2,6-dimethylbenzene-1,4-diol, 2,6-dimethylbenzo-1,4-quinone, 2,6-bis(hydroxymethyl)benzo-1,4-quinone, and 2,6-dimethylbenzo-1,4-aldehyde. Quantitative determination of related carboxylic acid and inorganic anions was done by ion chromatography . On the basis of the identified reaction products, a possible degradation pathway for the UV/O 3 oxidation of PCMX in aqueous media is proposed.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Yin Xu,Ying Wu,Wei Zhang,Xiaohui Fan,Yan Wang,Hui Zhang
Sucralose (SUC) is ubiquitously present in aquatic ecosystems in many parts of the world, owing to its widespread usage and ineffective elimination in wastewater treatment plants. This study investigated the mineralization of SUC in aqueous solution via UV/O 3 process and found that SUC can be mineralized efficiently. Effect of several operating parameters like solution pH, O 3 concentration, gas flow rate and initial SUC concentration, on TOC removal were explored. Results indicated that the mineralization efficiency of SUC reached almost 90% in 120 min after UV/O 3 treatment at neutral pH. The intensity of hydroxyl radicals generated in sole O 3 and UV/O 3 processes were compared using the fluorescence spectra analysis. Toxicity tests carried out using Daphnia Magna indicated that the UV/O 3 process under the used experimental conditions was much more effective in the detoxification of the SUC solution than sole O 3 process. The presence of inorganic anion like NO 3 − exhibited an enhancement on the mineralization rate, while Cl − showed some positive effect at low concentration (1 mM) but inhibited SUC mineralization at higher concentrations (10–200 mM). Finally, the intermediates produced in UV/O 3 process were identified by LC-MS analysis and a possible transformation pathway was briefly discussed.
研究领域:
环境科学
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水处理工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2026
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IF 6.6
Wendi Huang,Beibei Huang,Jingjun Bi,Junzhou Chen,Yufan Chen,Jianjun Yang,Jian Zhong,Ping Liu,Qingguo Gao
Recently, tellurium (Te), a p-type semiconductor material, has attracted tremendous interest in electronics and large-scale integrated circuits owing to its high hole mobility and excellent air stability. Although evaporated Te thin films have shown great potential for large-scale p-type transistors, further research is needed to improve the quality of Te thin films and enhance their electrical performance. In this work, we demonstrate that a simple ultraviolet/ozone (UV-O 3 ) pretreatment of Si/SiO 2 substrates can significantly reduce surface roughness and improve crystallinity in TeO x /Te films, as confirmed by grazing-incidence X-ray diffraction (GIXRD), Raman spectroscopy and atomic force microscopy (AFM). The improved structural properties lead directly to a remarkable improvement in device electrical performance. The hole mobility of devices fabricated on UV-O 3 -pretreated substrates increases markedly from 27.4 cm 2 /V·s to 75.8 cm 2 /V·s compared with those on untreated substrates. In addition, the subthreshold swing, hysteresis, contact resistance, interface trap state density and threshold-voltage stability under both negative bias stress (NBS) and positive bias stress (PBS) are all substantially improved. This work provides a simple and easily implementable approach to enhance the electrical performance of p-type Te-based transistors, offering valuable guidance for their application in next-generation electronics.
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Luxi Zou,Yan Wang,Chou Huang,Bingbing Li,Jinze Lyu,Shuo Wang,Hui Lu,Ji Li
The kinetic and pathway of meta-cresol (m-cresol) degradation were studied by persulfate oxidation through UV/ozone activation (UV/O 3 –Na 2 S 2 O 8 ) to improve m-cresol removal to eliminate ecological risks. Experimental results showed that the degradation effect of m-cresol with an initial concentration of 50 mg/L was 99.8% in 30 min under the optimization conditions. The reaction kinetic model in the UV/O 3 –Na 2 S 2 O 8 system shows that the initial pH value, the respective ozone, and the persulfate dosage were positively correlated with the degradation rate constant value ( k ). The apparent degradation rate of m-cresol in the UV/O 3 –Na 2 S 2 O 8 system was 0.2216 min −1 , and the synergy factor ( f ) was larger than 1, thereby demonstrating a synergistic effect of UV, ozone, and persulfate. The dominant free radicals in the system were sulfate radical (SO- 4·) and hydroxyl radical (·OH), and the contribution ratio of SO- 4· to m-cresol degradation was higher than ·OH. The degradation process of m-cresol by UV/O 3 − Na 2 S 2 O 8 was mainly through the electrophilic addition reaction to substitute the ortho- and para-positions of the hydroxyl group on the benzene ring, followed by the ring-opening reaction and mineralization of the aliphatic compound to achieve the complete degradation of m-cresol.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
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2018
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IF 3.193
Hao Yang,Hui Zhang,Henglun Cheng,Baoqing Shentu
Nano-TiO 2 immobilized antioxidant (TiO 2 -KH550-AG) was prepared to improve the ageing resistance of thermoplastic vulcanizate (TPV) exposed to UV/O 3 . TiO 2 nanoparticles were firstly modified with 3-aminopropyltriethoxysilane (KH550) and then reacted with the antioxidant , 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid (AG), through the acyl chloride reaction followed by the amidation. FT-IR, XPS and TGA measurements confirmed that the antioxidant (AG) was chemically immobilized onto the nano-TiO 2 surfaces. TPV/TiO 2 -KH550-AG nanocomposites were prepared by melt mixing. SEM observation showed that TiO 2 -KH550-AG was homogeneously dispersed into the matrix of TPV. The UV/O 3 ageing test of the samples was carried out in the environment with constant UV intensity of 1.40 mW/cm 2 and ozone concentration of 100 ± 4 mg/m 3 . The ageing resistance behavior of the TPV/TiO 2 -KH550-AG nanocomposites was evaluated by the changes of surface morphology , mechanical properties and carbonyl index during the UV/O 3 ageing test. It was observed that the TPV/TiO 2 -KH550-AG exhibited high stability during the process of UV/O 3 ageing. The results revealed that the anti-ageing efficiency of TiO 2 -KH550-AG was superior to the mixture of the corresponding AG and modified TiO 2 , owing to the better dispersion and migration resistance of TiO 2 -KH550-AG.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
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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.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）