SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Min-Yong Lee,Wen-Long Wang,Zi-Bin Xu,Bei Ye,Qian-Yuan Wu,Hong-Ying Hu
Dodecyltrimethylammonium chloride (DTAC) is a quaternary ammonium compound (QAC) that is a widespread contaminant in environmental media and therefore of increasing concern. The synergistic effect with UV irradiation and persulfate (UV/PS) was used to degrade DTAC . The removal of DTAC was 91% with the PS dosage of 75.6 μM (UV/PS) and UV fluence of 870 mJ·cm −2 . The second-order rate constants of DTAC with HO and SO 4 − were determined to be k HO , DTAC (4.2 ± 0.18) × 10 9 M −1 s −1 and k SO 4 ∙− , DTAC (2.5 ± 0.27) × 10 9 M −1 s −1 , respectively. The contributions of HO and SO 4 − to DTAC degradation in the UV/PS were found to be 30% and 62% at pH 7, respectively. The contributions of SO 4 − and HO were not significantly influenced by acidic medium (pH 3–pH 7), whereas they were significantly affected by basic medium (pH 7–pH 11). The wastewater matrixes of HCO 3 − , Cl − and humic acid inhibited the DTAC elimination, whereas NO 3 − and SO 4 2− had no significant impact on its elimination. Moreover, the k obs,DTAC in the reverse osmosis influent (ROI) and reverse osmosis concentrate (ROC) were examined to be 0.04 to 0.1 min −1 and 0.02 to 0.05 min −1 , respectively, as the PS dosage increased from 18.9 to 113.4 μM. The inhibitive effects of matrix in ROI and ROC was 70% and 81%, respectively. The contribution of radical scavenging effect by matrix ROI and ROC was more significant to DTAC degradation than UV scattering effect in ROI and ROC matrices. A UV fluence of 1305 mJ·cm −2 was necessitated for complete detoxification and DTAC solution by UV/PS.
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Nanomaterials
·
2019
·Vol. 9
·期 2
·220
·
IF 4.034
Guanjie Xing,Xiaoli Liu,Simeng Hao,Xiaohong Li,Louzhen Fan,Yunchao Li
Benefiting from their ultra-small diameters and highly structural anisotropies, ultrathin semiconductor nanowires (USNWs) are well-known for their fascinating physical/chemical properties, as well as their promising applications in various fields. However, until now, it remains a challenge to synthesize high-quality USNWs with well-controlled diameters and lengths, let alone the exploration of their size-dependent properties and applications. To solve such a challenge, we report herein a ligand-induced low-temperature precursor thermolysis route for the controlled preparation of ultrathin ZnS nanowires, which is based on the oriented assembly of the in-situ formed ZnS clusters/tiny particles. Optimized synthetic conditions allowed the synthesis of ZnS nanowires with a diameter down to 1.0 nm and a length approaching 330 nm. The as-prepared ultrathin ZnS nanowires were then intensively examined by morphological, spectroscopic and electrochemical analytical means to explore their size-dependent optical absorption properties, photocatalytic activities and band-edge energy levels, as well as their underlying growth mechanism. Notably, these USNWs, especially for the thinnest nanowires, were identified to possess an excellent performance in both the selective absorption of ultraviolet (UV) light and photocatalytic degradation of dyes, thus enabling them to serve as longpass ultraviolet filters and high-efficiency photocatalysts, respectively. For the ultrathin ZnS nanowires with a diameter of 1.0 nm, it was also interesting to observe that their exciton absorption peak positions were kept almost unchanged during the continuous extension of their lengths, which has not been reported previously.Keywords:ultrathin semiconductor nanowires;size-controlled synthesis;size-dependent optoelectronic properties
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Analytical Methods
·
2018
·Vol. 10
·期 11
·1325-1330
·
IF 2.073
Yong Zhang,Zhizhong Zou,Guixing Chou
To quickly determine the amounts of kirenol, darutoside and darutigenol in Herba Siegesbeckiae using HPLC, the efficiency of sample cleanup with different solid phase extraction methods was systematically investigated. The results showed that a polymer based strong anion exchange (P-SAX, 200 mg/6 mL) sorbent could separate and enrich diterpenoids providing rapid determination without impurity interference. In this paper a new HPLC-UV method using a core–shell column (Boltimate C18 3.0 × 100 mm, 2.7 μm) for the quantitative determination of three diterpenoids was developed. Under optimum experimental conditions, P-SAX pretreatment with a core–shell analytical column exhibited satisfactory results in the determination of diterpenoids in Herba Siegesbeckiae with recovery rates of 95–102%, relative standard deviations below 1.1%, a limit of quantitation as low as 0.1 6 μg mL−1, and a short analytical runtime of 8 min. Finally, the proposed method was successfully applied in the profiling of diterpenoids in Herba Siegesbeckiae from different regions.
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INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Bin Liang,Jiong Zhao,Gu Li,Yuekun Huang,Zhuohong Yang,Teng Yuan
With the growing depletion of fossil energy and the unceasing joint efforts to maintain sustainable development, bio-based materials are appealing for academic and industrial researchers because they possess the merits of environmental friendliness and renewability. In this study, a tung-oil-based derivative, tung-maleic anhydride (TMA), which was prepared from methyl eleostearate and maleic anhydride, reacted with epichlorohydrin to synthesize epoxidized tung-maleic anhydride (ETMA) after the hydrolysis of anhydride. Furthermore, ETMA was chemically modified by pentaerythritol triacrylate to obtain hexa-functional epoxidized tung-maleic anhydride acrylate prepolymers (PETMA). The chemical structure of the resultant prepolymers was confirmed by FT-IR and 1 H NMR, while the rheological behavior of prepolymers was investigated by using a rheometer. Also, the curing efficiency of different photoinitiators on PETMA prepolymers was investigated, and the result revealed that the tung oil-based prepolymers could be rapidly cured with 3.0 wt% photoinitiator PI-819 under a UV lamp with 5 kW light intensity within 45 s. Furthermore, various reactive diluents were used to be cured with PETMA prepolymers, and the thermomechanical properties, mechanical properties, volume shrinkage, swelling property, and general performances of the resultant UV-cured films were investigated. DMA results revealed that, among the films cured by the reactive diluents with same functionality, reactive diluents with a higher T g resulted in a higher T g toward the resultant cured films. The crosslinking density ( ν e ) of the films cured with various reactive diluents was determined by the double bond density, leading to the fact that the films cured with bi-functional reactive diluents exhibited a higher crosslinking density than the ones cured with mono-functional reactive diluents. TGA results showed that high crosslinking density facilitated improving the thermal stability of the cured films, while the steric structure in film matrix exerted adverse effect on thermal stability. Besides, tensile test indicated that high crosslinking density and steric structure facilitated the enhancement of mechanical properties toward the resultant films. More strikingly, all UV-cured films possessed excellent hardness, high glossiness and remarkable water resistance, and these high-performance bio-based UV-curable films are promising for widespread applications.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Haiying Chen,Jiemin Liu,Yipu Pei,Peng Zhao,Yan Zhang,Luchun Yan,Tongwang Zhang,Wenhui Li,Chuandong Wu,Muhammad Hussain
For the UV/Fenton treatment of waste gas, low solubility of volatile organic compounds (VOCs) was a significant factor of limiting gas–liquid mass transfer and thus restricted the removal efficiency. In this study, synergistic effect of UV/Fenton oxidation and mass transfer enhancement with addition of activated carbon (AC) was observed through a drastic improvement of n-octane removal in a bubble column reactor. Firstly, the effect of AC on mass transfer was investigated. Result revealed that the addition of AC could change bubble behavior and largely enhance the mass transfer efficiency (volumetric mass transfer coefficient ( k L a ) increased from 0.0057 to 0.14 s −1 as 0–0.1% AC was added) due to the particle shuttle effect. Then AC was introduced into the UV/Fenton reaction system, and the removal efficiency of n-octane had been remarkably improved (maintained above 50% in 60 min with addition of 0.04% AC, compared with below 10% in 20 min for the UV/Fenton alone). Moreover, we comprehensively detected the concentration of residual reactants, intermediates, final products and hydroxyl radicals in the gas and liquid phase. Results indicated that addition of AC could mildly and stably generate hydroxyl radicals (10 −8 M), and the mass balance showed that the mineralization efficiency had increased from 42.4% to 57.9%. For theoretical calculations, the value of the cooperation factor raising from 0.5 to 11.7 in 40 min could offer direct evidence for confirming the synergistic effect. Finally, the reaction pathways of n-octane in UV/Fenton or AC-UV/Fenton were proposed. It can be induced that the latter ones were more likely to first break the C C bond and then oxidize into small molecules acids or CO 2 .
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Water Reuse
·
2024
·Vol. 14
·期 3
·342-354
·
IF 4.3
Liu Z.,Xu M. Y.,Yin H.,Xie C. W.,Liu Q.,Liu H. T.,Liang S. Y.,Li J. K.,Zhang T. Y.,Li T.,Hu H. Y.,Xu B.
Membrane fouling is a prominent issue that affects the stable and efficient operation of reverse osmosis (RO) in reused water treatment. In this study, a zero-discharge RO system was adopted to treat the ultrafiltration permeate from a steel plant with the combined multi-wavelength UV-LED/chlorine process, focusing on organic structure modification and membrane fouling control. The results showed that the UV-LED/chlorine process could not only efficiently remove the dissolved organic carbon and the total nitrogen of the RO influent but also alter the organic substances from large molecules to small ones. In addition, the longer wavelength of a 295 nm UV-LED/chlorine process exhibited a greater RO permeate flux of 158 LMH, as compared to the shorter wavelength of 255 nm with the flux of 152 LMH. Moreover, compared to the single-wavelength, the dual-wavelength UV-LED/chlorine process played a more significant role in RO filtration performance, which induced a looser and thinner foulant structure, resulting in an 8% larger permeate flux and recovery at 275 + 295 nm than at 295 nm. This study demonstrated that the combined UV-LED/chlorine process could effectively alleviate RO membrane fouling. Our findings can provide theoretical and technical support for the sustainable development of membrane-based reused water treatment in the steel industry. Multi-wavelength UV-LED/chlorine process was effective for the pretreatment of RO for steel reused water treatment. UV-LED/chlorine process could oxidize organics to enhance RO filtration. Longer wavelength UV-LED/chlorine process was more favorable for organics removal and RO fouling control. Dual-wavelength UV-LED/chlorine pretreatment can induce less RO membrane fouling as compared to single wavelength.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
·
IF 7.435
Shenyu Lan,Ya Xiong,Shuanghong Tian,Jinxi Feng,Tianyao Xie
A new insight into the degradation of CuEDTA with UV/H 2 O 2 was performed. It was found that the degradation was an UV-enhanced self-catalytic process with two main stages. The first was the induction stage in which cupric ions were produced in CuEDTA degradation with UV photolysis or/and H 2 O 2 oxidation . The second was the photo-catalytic degradation stage in which CuEDTA was oxidized by UV-enhanced cupric ion-based Fenton process. The degradation efficiency reached as high as 82.2% during 18 min, being 37.4 times higher than the efficiency sum of single H 2 O 2 oxidation and single UV photolysis. The enhancement effect can be contributed to the synergetic interaction between H 2 O 2 , cupric ion and UV, specially, to the excellent photo-activity of copper-peroxide intermediates. One of them was identified to be CuO 2 by analysis of its CE-C 4 D electropherograms, UV–vis adsorption spectra, FT-IR spectra, Raman spectra, especially XPS spectra. The enhancement mechanism was experimentally confirmed to be due to the acceleration of Cu(II)-to-Cu(I) transform by the photolysis of copper-peroxide intermediates, leading to the increasing CuEDTA degradation.
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Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Fei Kong,Xiao Huang,Danyang Yue,Jun Pan
Cancer is a leading fatal disease worldwide. To increase its therapeutic efficiency, more effective with less side effect and patient acceptable administration approach is expected. Moreover, modification of tumor microenvironment is proved to be operative recently. In this paper, a nanocarrier named LDEDDS was developed for intelligent tropical administration of skin cancer, along with removal of hydrophobic cancerous secretion to change tumor microenvironment. It was made by coating of amphipathic polymer P(BA- co -HBA) on docetaxel (TXT, a model hydrophobic anticancer drug) loaded Fe 3 O 4 @ZnO. Results showed that an optimal loading rate of TXT in Fe 3 O 4 @ZnO was 89.75 ± 0.15%, corresponding to loading capacity of 17.95 ± 2.97% when the mass ratio of Fe 3 O 4 @ZnO to TXT was 1:20. The LDEDDS had a narrow distribution size of 115.8 nm in average and was superparamagnetic. Without UV radiation, it had low TXT release (< 7% in 48 h) and cytotoxicity (< 14% in 96 h) to both the normal and carcinoma skin cells. While under a UV with a dose much lower than physiological dose of normal sunlight, LDEDDS released around 60% and 90% of TXT in 1 and 48 h. 1 h UV treated LDEDDS removed up to 62% of cancer secreted epidermal growth factor (EGF), a model hydrophobic secretion in 96 h. Consequently, 1 h UV treated LDEDDS inhibited up to 60% of the growth of skin cancer cells in 96 h, overriding those effects of the same concentration of TXT in in vitro cellular experiments. This is the first study to change tumor microenvironment by removal of cancerous secretion and is proved to be effective. Along with the superparamagnetic property, which provides potential for concentrating, increasing penetration and internalization into cancerated cells as well as removing from body under an external magnetic field, we predict LDEDDS will have potential applications in clinic skin cancer therapy.
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Food Analytical Methods
·
2016
·Vol. 10
·期 1
·111-117
·
IF 2.167
Liu Qi,Wang Li,Hu Jie,Miao Yanni,Wu Zixue,Li Jianrong
A rapid and sensitive analytical method for the determination of main organic acids in wines was developed by capillary electrophoresis (CE) with indirect UV detection. Separation parameters including the pH of electrolyte, chromophore, and its concentration were optimized. The results showed that the optimal electrolyte for the separation of organic acids consisted of 10 mmol L −1 2, 4-dihydroxybenzoic acid (DHBA) at pH 3.6 containing 0.4 mmol L −1 cetyltrimethlammonium bromide (CTAB). DHBA as chromphore was selected based on the close mobility to the analyte and relatively large molar extinction coefficient. The method showed good linearity with limits of detection (LOD), ranging from 0.5 to 7.5 mg L −1 . The relative standard deviation (RSD) of interday precisions for the peak area and the migration time were less than 7.2 and 0.8 %, respectively. The recoveries of the analyte in Chinese rice wine sample were between 90.3 and 106.9 % with RSD ranging from 1.4 to 8.9 %. The method was successfully applied to the commercial rice wine and beer samples with dilution and filtration.
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EUROPEAN POLYMER JOURNAL
·
2014
·
IF 3.242
Bolin Li,Xiaolin Lu,Yonghao Ma,Zhan Chen
A novel thermo- and pH-responsive poly(acrylic acid) (PAA)/poly(4-vinylpyridine) (P4VP) aqueous material with an upper critical solution temperature (UCST) was developed in this study. It was found that the formation of the aqueous complex material was caused by the deprotonation of pyridinium groups of P4VP molecules and consequent hydrogen bonding formation between pyridine and carboxylic groups. This aqueous material exhibited significant reversible transition behaviors between the turbid colloidal and transparent solution states upon altering the pH and temperature values. Furthermore, the correlation between the solution pH and the upper critical solution temperature (UCST) enables us to design responsive aqueous materials with a broadly adjustable transition temperature range.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2017
·
IF 2.603
Xiao Zhao,Youfa Xu,Lifang Zhang,Chunmei Wang,Chunna Guo,Chenzhong Fei,Keyu Zhang,Xiaoyang Wang,Yingchun Liu,Mi Wang,Wenli Zheng,Feiqun Xue
Ethanamizuril (EZL) is a novel anti-coccidial triazine synthesized by the Shanghai Veterinary Research Institute of the Chinese Academy of Agricultural Sciences. As a novel coccidiostat, it is essential to study its residue in food animal tissues. In this study, a reliable UPLC method for the determination of ethanamizuril (EZL) and one of its metabolites (M3) in chicken muscle, skin and fat, liver, and kidney samples was developed. Analytes were extracted using acetonitrile and 10% sodium carbonate solution, defatted by n -hexane, and further purified by using an Oasis MCX cartridge. The calibration curves for both test compounds were linear in all tissue matrices we tested: muscle, skin and fat, liver and kidney. The mean relative recoveries of EZL and M3 were from 87.3% to 103.2% between all tissue samples. The inter-day and intra-day relative standard deviations were within 15% and 20%, respectively. This method is accurate, reproducible and is ready to be field-tested.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Jialin Liang,Fang Yuan,Ting Liu,Chenguang Qian,Zhangshuo Song,Lijuan Wei,Chunquan Li,Zhiming Sun
Photothermal catalytic oxidation is a promising and sustainable method for the degradation of indoor formaldehyde (HCHO). However, the excessively high surface temperature of existing photothermal catalysts during catalysis hinders the effective adsorption and degradation of formaldehyde under static conditions. Catalyst loading and oxygen vacancies (OVs) modulation are commonly employed strategies to reduce the photothermal catalytic temperature and enhance the efficiency of photothermal catalytic oxidation. In this work, a p-n type CuO/TiO 2 heterojunction is successfully loaded onto diatomite using a wet precipitation method. Under the irradiation of a 300W xenon lamp, the prepared composite material achieved a 100% removal rate of HCHO within 2 h, with a 98% conversion rate to CO 2 , surpassing the performance of both individual photocatalysts and thermocatalysts. Additionally, by adjusting conditions such as light irradiation and temperature, we have demonstrated that this material exhibits synergistic photothermal catalytic properties. Based on HRTEM, XPS, Raman, and EPR analyses, the introduction of diatomite as a catalyst support was shown to effectively increase the number of OVs. Experimental results, along with O 2 -TPD, photoelectrochemical characterization, and radical detection, demonstrate that the presence of OVs enhances the oxidative efficiency of both photocatalysis and thermocatalysis, as well as the UV–Vis-IR photothermal catalytic performance. The ternary composite material generates weak hydroxyl ( • OH) and superoxide ( • O 2 − ) radical under high-temperature with dark conditions, indicating its catalytic oxidation activity under this condition. The increase in temperature and the expansion of the spectral range both enhance the generation of these radicals. In summary, this work demonstrates that the use of diatomite as a support increases the material's specific surface area and OVs content, thereby enhancing adsorption and photothermal catalysis. It elucidates the enhanced catalytic degradation mechanism of this mineral-based photothermal catalyst.
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危险品化学品经营许可证（带存储）