SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Yajie Qian,Jing Zhang,Yalei Zhang,Jiabin Chen,Xuefei Zhou
In this study, a newly emerging oxidant nanoscale calcium peroxide (nCaO 2 ) was synthesized to degrade 2,4-dichlorophenol (2,4-DCP). nCaO 2 was prepared from nanoscale Ca(OH) 2 and H 2 O 2 and confirmed to be less than 150 nm in diameter and 62.23 m 2 · g −1 in specific surface area (SSA). For treating 2,4-DCP, the optimal ratio between Ca(OH) 2 and H 2 O 2 was 1:5. Compared with conventional CaO 2 , nCaO 2 was found to be more efficient for destructing 2,4-DCP. 2,4-DCP was completely degraded in 5 d by nCaO 2 while only 75.0% 2,4-DCP was destructed by conventional CaO 2 . The effects of solution pH and water matrix, including SO 4 2− , HCO 3 − and humic acid (HA) were examined. The reactive species in nCaO 2 system was investigated by photoluminescence (PL) technique and the quenching experiments. Results showed that hydroxyl radical (OH ) was the dominant reactive species for destructing 2,4-DCP. The major oxidation products identified in this study were 2-chlorophenol (2-CP), 4-chlorophenol (4-CP), phenol and benzoquinone (BQ). Our works gave an important insight into the use of nCaO 2 to degrade some organic contaminants which might provide some references for the application of nCaO 2 in chlorophenols contaminated groundwater remediation.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2017
·
IF 3.648
Hongmei Zhang,Yanqing Wang,Haidan Zhu,Zhenghao Fei,Jian Cao
Triclocarban (TCC) is an antibacterial agent in antibacterial personal care products. Human serum albumin (HSA) is the transport protein with the ligand binding properties. The current study was undertaken to identify the binding mechanism of TCC with HSA by using biophysical methods . The fluorescence and UV–vis spectral results showed that the fluorescence quenching of HSA by TCC was static quenching by the formation of HSA-TCC complex. The binding constants were obtained by molecular modeling and fluorescence quenching, and the results indicated the existence of strong interaction between HSA and TCC with binding constant K b ~ 10 5 L/mol. TCC can enter into the binding pocket of domain II of HSA by mainly hydrophobic and hydrogen bonds forces. The conformations of TCC and HSA are all changed during the binding interaction of them. We hope that this work will provide some useful information for understanding the activity and mechanism of antibacterial agent with the transport protein.
研究领域:
生物化学
·
药理学
✓ 已验证
DOI
高影响因子
Journal of Applied Spectroscopy
·
2025
·
IF 1
Han Dan,Niu Xiaoxue,Wang Jing,Yan Zihong
Zr and Cl double-doped carbon dots (Zr/Cl-CDs) were prepared by a one-step hydrothermal method using citric acid, urea, and ZrCl 4 as precursors. Zr/Cl-CDs were characterized by ultra-violet-visible spectroscopy (UV-Vis), transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy (XPS). Experimental analysis revealed that the average size of Zr/Cl-CDs was 2–3 nm, while XPS analysis revealed the presence of C–Cl and Zr–O bonds. The fluorescence quantum yield of the final CDs was 17.5% at the excitation of 360 nm. In addition, Zr/Cl-CDs exhibited excellent performance in the detection of rutin with a concentration of 30–110 and 100–160 μmol/L, respectively. Linear correlation coefficients (R 2 ) were 0.9931 and 0.9962. The underlying mechanism was that rutin had an excellent quenching effect on the emission of the Zr/Cl-CDs as the fluorescence intensity exhibited a good linear relationship between rutin concentration and fluorescence intensity. These findings provide a new strategy for synthesizing double-doped CDs for rutin detection.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2024
·Vol. 31
·期 3
·1005-1014
·
IF 2.5
Han Song,Wang Yanqing,Xu Yanru,Wu Jinlong
Bulk polytetrafluoroethylene (PTFE) foam is a great potential oil–water separation material, owing to the high hydrophobicity and lipophilicity property. However, the technique of fabricating PTFE foam with low cost, controllable porosity and high mechanical strength remains an urgent requirement due to its high chemical inertness induced limitation. A kind of bulk PTFE foam material is prepared by cold pressing co-sintering method, employing sodium chloride (NaCl) as pore forming agent. SEM measurements reveal that the size and distribution of pore structure are mainly determined by the particle size and content of NaCl, because the migration and diffusion behaviors of PTFE particles suffer from more inhibition induced by increased NaCl particles during sintering. The PTFE foam with uniformly distributed pore structures can be obtained from composite mixed with 70 wt% NaCl and 30 wt% PTFE, with a low thermal conductivity as low as 0.069 W/(m K). With the decrease of PTFE content in raw composite, the density and mechanical properties of PTFE foam gradually declines. However, the tensile strength remains as low as 0.2 MPa, with an elongation rate of 21%, which guarantees the required mechanical strength avoiding being broken when use as a bulk oil absorption material. Remarkably, the PTFE foam shows a strong hydrophobicity, with a mean water contact angle of 137°, and with a mean surface roughness of 4.41 μm. It exhibits separation efficiency larger than 99% in 30 cycles, with separation flux larger than 4000 L/m 2 /h within 15 cycles, indicating excellent recyclability and stability. The PTFE foam sample also shows desirable continuous separation performance for oil/water mixture. The proposed bulk PTFE foam with low manufacturing cost and stable chemical and mechanical properties will provide data and theoretical support for the material applied in oil/water separation and thermal-protective coating.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2017
·
IF 2.813
Ling Zhang,Xue Liu,Rui-Xia Yang,Nian-Yu Huang,Wei-Qiao Deng
Covalent triazine-based frameworks (CTFs) are important microporous materials with a wide range of applications. Here, we demonstrate an environmentally benign and economic synthetic pathway to CTFs. The monomers used for CTFs, aromatic nitriles , were obtained by cyanation using nontoxic potassium hexacyanoferrate(II) in place of commonly used toxic cyanides. Then, the CTFs were synthesized by trimerization of the corresponding cyano monomers in molten zinc chloride . A series of CTFs was synthesized, and the highest Brunauer-Emmett-Teller surface area measured in this series was 2404 m 2 /g. Among the synthesized CTFs, CTF DCP exhibited excellent CO 2 adsorption properties, with a CO 2 uptake of 225 mg/g at 0 °C.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ChemistryOpen
·
2017
·Vol. 7
·期 2
·136-143
·
IF 2.918
Ling Li,Shu Wang,Hongxia Lan,Guiyi Gong,Yifan Zhu,Yu Chung Tse,Keith Man-Chung Wong
Graphical Get the picture : A series of rhodol derivatives with extended π conjugation are reported to give selective sensing properties. Those functionalized with a phenyl isothiocyanate group can serve as a fluorescent probe for bioimaging of endogenous HClO within HeLa cells. Two sensors, 1 with a spirolactone group and 2 with a spirolactam group containing a phenyl isothiocyanate moiety, based on rhodol, were designed and synthesized in order to obtain materials with excellent optical properties for the detection of environmentally and biologically important Hg 2+ and hypochlorous acid (HClO) ions. The crystal structure of 1 revealed two moieties, a rhodamine-like portion with a spirolactone and a fluorescein-like portion without a spirolactone. In the absence of analyte, 1 produced an optical output with a maximum absorption and emission at 475 and 570 nm, respectively, which was attributed to the fluorescein-like moiety without a spirolactone. In contrast, the rhodamine-like moiety containing a spirolactone was activated by the addition of H + or Hg 2+ ions, and 1 yielded new absorption and emission peaks at 530 and 612 nm, respectively. Further functionalization with a phenyl isothiocyanate group afforded 2 , a fluorescent probe for HClO. High selectivity and sensitivity towards the hypochlorite ion were anticipated, owing to the stoichiometric and irreversible formation of a thiosemicarbazide group, which led to dramatic fluorescence responses. With good functionality at physiological pH, probe 2 was successfully used to image HClO in HeLa cells.
研究领域:
化学
·
生物医学
·
分析化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ziwei Guo,Gui Yang,Yang Wu,Juan Long,Huan He,Xiaomin Ren,Bin Huang,Xuejun Pan,Yujun Liang
Defect engineering offers a feasible avenue to ameliorate the photocatalytic activities of semiconductors, but the traditional preparation processes for introducing the defects would destroy the pristine morphology of the materials. Herein, a controllable defect engineering on CeO 2 nanodots loaded Bi 4 TaO 8 Cl perovskite nanosheets was approached to synthesize well-defined CeO 2 /Bi 4 TaO 8 Cl (CE-BTC) heterojunction with stable oxygen vacancies (OVs) via a molten-salt-mediated strategy. Due to the coexistence of OVs and Ce 4+ /Ce 3+ redox couple, the photo-Fenton degradation rate of ofloxacin by optimal CE-BTC heterojunction (0.09610 min −1 ) was 7.78 and 4.98 times higher than that by individual Bi 4 TaO 8 Cl and CeO 2 , respectively. Moreover, the CE-BTC also exhibited excellent degradation performance towards other antibiotics including norfloxacin, ciprofloxacin, tetracycline, and sulfamethoxazole, while maintaining good recyclability and stability. The high efficiency of CE-BTC was also attributed to its enhanced light-harvesting capability, low photogenerated carrier recombination, and minimal electron transfer resistance. Mechanism study indicated that ⋅OH and ⋅O 2 – were the dominant reactive species, whereas h + also participated in the removal of ofloxacin with a lower contribution. This study demonstrated the enormous potential of CE-BTC heterojunction in the degradation and risk control of antibiotics, providing a promising strategy for designing highly dispersed heterojunction catalysts with surface defects.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Zhengyuan Zhou,Jingyao Huang,Guilu Zeng,Rumin Yang,Zhiqiang Xu,Zhikang Zhou,Shuguang Lyu
S(IV)-based advanced oxidation process has been applied for contaminants remediation. However, as a traditional source of sulfite (SO 3 2− ), Na 2 SO 3 is extremely soluble in water, resulting in a high concentration of SO 3 2− to quench the generated reactive oxygen species (ROS). In this work, CaSO 3 was introduced instead of Na 2 SO 3 for its slow-released SO 3 2− ability and Fe(III)/CaSO 3 system was established for the removal of trichloroethylene (TCE) and other organic contaminants. The degradation efficiency of TCE reached 94.0% and TCE could be completely dechlorinated and mineralized, while the removal of other contaminants was all over 85.0% at the optimal tested conditions. Through EPR detection, ROS scavenging and probe tests, and quantification of ROS amounts, it was concluded that the dominant ROS in Fe(III)/CaSO 3 system were SO 4 − · and 1 O 2 , of which the transformation mechanism of SO 4 − · to 1 O 2 was revealed and demonstrated comprehensively. The synergistic contaminants degradation performance in different sulfur-iron-containing systems and in the presence of oxidants was evaluated. The effects of various solution conditions were assessed and Fe(III)/CaSO 3 system was of higher resistance on complex solution matrixes, suggesting the broad-spectrum and application perspective for the remediation of complex contaminants in actual water.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Yuanxi Huang,Haoyu Xu,Baiyang Chen,Huimei Pan,Zechao Qiu
Haloacetaldehydes (HALs) are a type of disinfection byproducts (DBPs) frequently found in disinfected drinking water, and their effective control is important to safeguard human health. To evaluate the appropriateness of using ultraviolet technology for drinking water treatment, this study comparatively examines the photolysis of three chlorinated HALs (Cl-HALs), including monochloroacetaldehyde (MCAL), dichloroacetaldehyde (DCAL), and trichloroacetaldehyde (TCAL), under varying operational and environmental conditions by 254 nm ultraviolet (UV 254 ). Results show that they can be degraded within 2 h at an initial concentration of 20 μg/L with pseudo-first-order reaction rates ranked as MCAL > DCAL > TCAL. Chloride was the major product and total organic carbon decreased substantially, indicating that UV irradiation of Cl-HALs mainly underwent mineralization. MCAL was not formed during photolysis of DCAL or TCAL, suggesting that the carbon-chloride bonds in Cl-HALs were cleaved simultaneously rather than sequentially. In terms of influencing factors, adding free chlorine into solution apparently enhanced Cl-HALs photolysis, whereas increasing Cl-HALs dosage, nitrate, bromide, or iodide inhibited Cl-HAL photolysis. Under their combined effects, the photolysis rates of Cl-HALs dosed into tap and swimming pool waters were lower than those dosed into ultrapure water. These findings hence provide insights for better understanding the treatability of UV 254 for Cl-HALs control.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Murtaza Ali,Da-Wen Sun,Jun-Hu Cheng,Okon Johnson Esua
The effects of combined treatment (PAL-U) of plasma-activated liquid (PAL) including plasma-activated water (PAW) and plasma-activated buffer solution (PABS) and ultrasound (U) for the degradation of chlorothalonil fungicide on tomato fruit was investigated. Distilled water and buffer solution were activated by radiofrequency plasma jet for durations of 1, 3, 5, and 10 min to obtain PAL 1 to PAL 10 . Fruits were immersed in PAL for 15 min and also in distilled water with sonication for 15 min for individual treatments, and in PAL with sonication for 15 min for combined treatments. The maximum chlorothalonil fungicide residues were reduced by 89.28 and 80.23% for PAW 10 -U and PABS 10 -U, respectively. HPLC-MS characterization revealed chlorothalonil degradation pathway and formation of 2,4,5-trichloroisophthalonitrile, 2,4-dichloroisophthalonitrile, 4-chloroisophthalonitrile, isophthalonitrile and phenylacetonitrile as degradation products. Treatments also showed no negative effects on tomato quality. Therefore, PAL and PAL-U treatments could serve as effective methods for degrading pesticides on tomatoes.
研究领域:
食品科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ying Yan,Qinxue Yang,Qigao Shang,Jing Ai,Xiaofang Yang,Dongsheng Wang,Guiying Liao
Metals doped carbon nitride (CN) is considered as a class of promising efficient catalysts for peroxymonosulfate (PMS) activation in water purification. Herein, ruthenium doped carbon nitride (CNRu) was synthesized via a facile one-pot method, and CNRu was in form of Ru–N 2 that could efficiently activate PMS for DCF degradation and detoxification via nonradical pathway. DCF was completely removed within 10 min under the optimized condition in a wide working pH range of 3.00–9.00, while other traditional transition metals (e.g. Fe, Co, Ni, Cu) doped CN showed negligible removal of DCF due to adsorption rather than activation of PMS, which was demonstrated by DFT calculations. CNRu showed high stability and reusability after seven cycles and very few Ru leaching was detected in DCF degradation process. Ru was highly dispersed in form of Ru–N bond via coordinating to pyridine nitrogen, and the electron defect transfer between Ru and coordinated N, rather than redox cycle of Ru, mediated superoxide radicals (O 2 •− ) evolution, which was further hydrolyzed into singlet oxygen ( 1 O 2 ) and responsible for DCF removal. Thus, the CNRu/PMS system showed high tolerance to inorganic anions. Much lower toxic intermediates/products than DCF were obtained via the strong electrophilic attack reaction between 1 O 2 and DCF in CNRu/PMS system. This study displayed a new practical application prospect of ruthenium-based materials for high-efficient removal and detoxification of DCF from wastewater.
研究领域:
环境科学
·
催化材料
·
水处理技术
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Wei Xiang,Tao Zhou,Yifan Wang,Mingjie Huang,Xiaohui Wu,Juan Mao,Xiejuan Lu,Beiping Zhang
This study has demonstrated that hydroxylamine (HA) could greatly enhance Cu nanoparticles (nCu) in activating molecular oxygen and significantly elevate the diclofenac (DCF) degradation rate about two orders of magnitude in neutral circumstances. Effects of several important parameters on the DCF degradation such as nCu loading, HA dosage, pH and reaction temperature were investigated in the nCu/HA/O 2 system. Multiple examinations revealed that the reactive Cu(III) species instead of OH• would be predominant in the nCu/HA/O 2 system, despite their similar DCF degradation pathways. Based on a HA-enhanced copper cycle depending on the pristine Cu 0 @Cu(I) (hydro)oxides core-shell structure, the heterogeneous-homogeneous reaction mechanism was proposed. It included solid-liquid interfacial and bulk reactions, e.g. heterogeneous activation of O 2 by Cu(I) to produce H 2 O 2 and homogeneous Cu(I)-catalytic generation of Cu(III) from H 2 O 2 . Further quantitative investigation of the main reactive species in the cycle revealed that the Cu(I) regeneration instead of the O 2 activation would be rate-limited. Besides, nCu could be recycled to effectively degrade DCF in four consecutive cycles in the raw neural nCu/HA/O 2 system. It suggested that the nCu/HA/O 2 system with a more efficient copper cycle would be a good alternative Fenton-like system in treating neutral recalcitrant organic wastewaters.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
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