Foods
·
2023
·Vol. 12
·期 15
·2875
·
IF 5.2
Yibo Dong,Xiaolong Yao,Wanping Zhang,Xiaomao Wu
3,4-dichloroaniline (3,4-DCA) and 3,5-dichloroaniline (3,5-DCA) are, respectively, the primary metabolites deriving from the breakdown of phenylurea herbicides and dicarboximide fungicides in both soils and plants, whose residues in vegetable products have a heightened concern considering their higher health risks to humans and greater toxicity than the parent compounds in the environment. In this study, a sensitive high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method was developed for the simultaneous determination of 3,4-DCA and 3,5-DCA residues in chive products based on the optimization of HPLC-MS/MS chromatographic and mass-spectrometric conditions using the standard substances and the modified QuEChERS preparation technique. The preparation efficiency of 3,4-DCA and 3,5-DCA from chive samples showed that acetonitrile was the best extractant. The combination of the purification agent graphite carbon black + primary secondary amine and the eluting agent acetonitrile + toluene (4:1,v/v) had a satisfactory purification effect. The linear correlation coefficients (R2) were more than 0.996 with the six concentration range of 0.001–1.000 mg/L for 3,4-DCA and 3,5-DCA. The limit of detection and limit of quantitation of this method was 0.6 and 2.0 µg/kg for 3,4-DCA, as well as 1.0 and 3.0 µg/kg for 3,5-DCA, respectively. The matrix effect range of 3,4-DCA and 3,5-DCA in chive tissues was from −9.0% to −2.6% and from −4.4% to 2.3%, respectively. The fortified recovery of 3,4-DCA and 3,5-DCA in chive samples at four spiked levels of 0.001–1.000 mg/kg was 75.3–86.0% and 78.2–98.1%, with the relative standard deviation of 2.1–8.5% and 1.4–11.9%, respectively. The limit of detection (LOD) and limit of quantification (LOQ) of the method were 0.6, 2.0, and 1.0, 3.03 for 4-DCA and 3,5-DCA, respectively. This study highlights that the analytical method established here can efficiently and sensitively detect residues of 3,4-DCA and 3,5-DCA residues for monitoring chive products. The method was successfully applied to 60 batches of actual vegetable samples from different regions.Keywords:3,4-dichloroaniline;3,5-dichloroaniline;simultaneous determination;UPLC-MS/MS;chive
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2014
·Vol. 31
·期 12
·2192-2197
·
IF 1.241
Anjum Muhammad Naveed,Zia Khalid Mahmood,Zhu Lihua,Haroon-ur-Rashid,Ahmad Mirza Nadeem,Zuber Mohammad,Tang Heqing
Self-assembled hollow microspheres poly( o -chloroaniline) (POC) have been synthesized by simple oxidative polymerization of o -chloroaniline using camphor-sulfonic acid (CSA) as dopant acid and ammonium persulfate (APS) as oxidant. The POC microspheres were characterized by means of FTIR, XRD and SEM analysis. Adsorption characteristics of POC spheres were studied by using methyl orange (MO) as adsorbate. It was found that adsorption of MO by POC was better described by pseudo-second-order kinetics than any other kinetic model, such as the pseudo-first-order and intra-particle diffusion models. Langmuir adsorption isotherm model was the best to fit experimental data. The results showed that hollow microspheres of POC can be used as novel and low-cost adsorbent for removal of organic dye from waste water.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Yanmei Yuan,Hong Tao,Jinhong Fan,Luming Ma
Compared with heavy metal catalysts, persulfate (PS) activated with iron-based materials for controlling refractory organic pollutants are more effective, environment-friendly, and safe to human health. However, Fe 2+ application is limited to acidic conditions, and Fe 0 is not thermodynamically stable in water. Ferrous sulfide (FeS) ore particles are large-sized, low-purity, crystallized iron-based materials that are inexpensive and readily available. In this work, FeS is proposed as an alternative electron donor to activate persulfate and degrade p -chloroaniline (PCA). The effects of initial solution pH, FeS dose, and persulfate concentration on PCA degradation and total organic carbon (TOC) removal were examined at 20 ± 5 °C in batch experiments. Cl − , SO 4 2 − , and Fe 3+ ions were the main inorganic products used to investigate the oxidative mechanism in the present system. Compared with Fe 2+ , FeS could serve as a continuous-releasing source of dissolved Fe 2+ and surface bound Fe 2+ , with PCA removal increasing by 80% at pH 7.0 for a 1 h reaction. In contrast with Fe 0 , recycling of Fe 3+ to Fe 2+ can prevent excessive Fe 2+ consumption and Fe 3+ accumulation. The PS activation mechanism was affected by the initial solution pH. And the application ranges of pH for PCA fast degradation was from 3.0 to 7.0 in the tested pH values of 3.0–11.0 and nearly complete degradation of PCA (>99%) was observed at 150 min, PCA degradation increased as the FeS dose and persulfate concentration increased. PCA removal, dechlorination, and TOC removal reached over 99% within 60, 210, and 500 min, respectively. Generation of small amounts of amorphous iron oxide precipitants on the residual FeS surface was, observed and FeS recyclability was conducted preliminarily. These findings suggest that FeS can function as an effective persulfate activator for PCA control.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Chenhui Yao,Yongqing Zhang,Meimei Du,Xiaodong Du,Shaobin Huang
Persistent organic pollutants (POPs) are widely distributed and have significant negative environmental impacts. Advanced oxidation processes (AOPs) based on sulfate radicals produced from persulfate (PS) have attracted considerable attention for the degradation of POPs, however, there are several disadvantages with these radical activation systems. This study examined the degradation of p -chloroaniline (PCA) by persulfate (PS) activated with activated carbon (AC). The effects of initial pH and dosage of AC were also investigated. Results showed that AC exhibits good catalytic activity toward PS. Increasing AC dosage significantly improved the PCA degradation rate but PCA removal was not obviously influenced by initial pH ranging from 3 to 9. PS activation in the PS/AC system was a non-radical process as demonstrated by (i) ethanol and tert -butyl alcohol having little effect on PCA removal and (ii) Electron Paramagnetic Resonance results showing no radicals signals in the PS/AC system. Results also demonstrated that TOC could be removed in PS oxidation and PCA dechlorination was rapid (in the initial 30 min). The three major intermediates identified during the PCA degradation in the non-radical oxidation process were N-(4-chloro-phenyl)-benzene-1,4-diamine, 4-chloro-phenyl-diazene and hydroquinone and two pathways of PCA degradation was proposed. This study proposes a new insights into the mechanism of PS activation by AC and an efficient method for POPs removal.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Mian Hu,Xiaotong Huang,Letao Sun,Weicheng Zheng,I-Ming Chou,Libo Wu,Jinling Wan,Zhiyan Pan,Junliang Wang
Catalytic oxidation of o -chloroaniline ( o- ClA) in hot compressed water (HCW) was investigated in a fused quartz tube reactor (FQTR) to determine the effects of catalyst, temperature, oxygen stoichiometric ratio (OSR) and reaction time on o- ClA mineralization, total nitrogen (TN) removal rate and nitrogen-containing products distribution. The results showed that o -ClA can be effectively degraded in HCW. With the increased of OSR, retention time and temperature or added of Mn 2 O 3 as catalyst, the mineralization rate of o -ClA and the removal rate of TN increased. Ammonia-N was the main nitrogen-containing intermediate product of o -ClA degradation, however, when the oxidant was excessive, ammonia-N was oxidized to form nitrate-N. Althought the catalytic effect of Mn 2 O 3 on the mineralization of o -ClA was not outstanding, it promoted the removal of ammonia-N from the benzene ring, improved the degradtion of ammonia-N, and inhibited the production of nitrate-N. GC–MS analyzed results indicated that o -chlorophenol was the main degradation intermediate product of o -ClA in HCWO process. Meanwhile, the potential degradation pathway of o -ClA was proposed. This work thus provides basic knowledge about o -ClA catalytic oxidation removal in HCW process.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Shizong Wang,Jianlong Wang
Chloroaniline is a typical organic pollutant in chemical wastewater, which cannot be effectively removed in conventional wastewater treatment processes . In this study, ionizing radiation was used as advanced treatment process to degrade 2-chloroaniline (2-CA). The results showed that 10 mg/l of 2-CA could be completely degraded at 1 kGy. The required dose for completely degrading 2-CA by radiation increased when its initial concentration increased. Solution pH affected 2-CA degradation by changing the radiation-chemical yield of reactive species. Chloride ions (10 and 100 mM) had not obvious influence on 2-CA degradation. Hydrogen radicals, hydrated electrons and hydroxyl radicals , all contributed to the degradation of 2-CA, but with different degradation mechanisms. Hydrogen radicals and hydrated electrons could initiate reductive dechlorination of 2-CA, while hydroxyl radicals can degrade 2-CA by hydroxylation. 6-amino-1,4-cyclohexadiene and chlorobenzene were the main intermediate products of 2-CA degradation in the hydrogen radicals or hydrated electrons dominant process; while o-hydroxyaniline and nitroso-chlorobenzene were the main intermediate products in the hydroxyl radicals dominant process. The solution toxicity after radiation treatment varied with the initial concentration of 2-CA and the absorbed dose. In the actual chemical wastewater, 2-CA can be effectively removed by radiation, even in the presence of high concentration of chloride ions (about 2800 mg/l). The solution toxicity of actual wastewater decreased with the increase of adsorbed dose. This study provided an insight into the 2-CA degradation by radiation, and demonstrated that radiation could be an alternative option for the treatment of chloroaniline-containing chemical wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 22
·11294-11300
·
IF 8.867
Xin Li,Yue Wang,Liqun Li,Wenqing Huang,Zicheng Xiao,Pingfan Wu,Wenbo Zhao,Wei Guo,Peng Jiang,Minghui Liang
Two types of model Pt–Cu catalysts are designed and prepared to explore the contribution of the geometric and electronic effects from copper to the catalytic performance of Pt nanoparticles in the selective hydrogenation of p-chloronitrobenzene (p-CNB). One model Pt–Cu catalyst (called Cu/C–Pt) is Pt nanoparticles deposited on ultra-small copper particle-decorated activated carbon, and the other is copper particle-decorated Pt/C catalyst (called Pt/C–Cu). Cu/C–Pt catalyst has an activity lower than that of Pt/C, but the selectivity of the desired product p-chloroaniline (p-CAN) on the Cu/C–Pt catalyst is much higher than that on Pt/C. On the Pt/C–Cu catalyst, p-CNB cannot be completely converted into p-CAN. The dechlorination rates of p-CAN on Cu/C–Pt catalysts are three orders of magnitude lower than that on Pt/C. More interestingly, the dechlorination reaction of p-CAN on Pt/C–Cu cannot be observed. High resolution TEM images of our Pt–Cu catalysts show that Pt nanoparticles keep their crystalline structure after incorporation with copper. The dispersions of Pt in 2Pt/C, 5Cu/C–2Pt, and 2Pt/C–5Cu reach 0.106, 0.083 and 0.027, respectively (the numbers before Pt and Cu represent their percentages), revealing that Pt nanoparticles in Cu/C–Pt have a larger exposed surface than those in Pt/C–Cu. It can be deduced that copper mainly exerts an electronic effect on the catalytic performance of Pt nanoparticles in Cu/C–Pt. On the other hand, the geometric effect on Pt from copper in Pt/C–Cu leads to not only a low dispersion of Pt nanoparticles but a weak activity in catalytic hydrogenation of p-CNB and dechlorination of p-CAN. The interaction between Pt nanoparticles and Cu nanoparticles at room temperature is also discussed.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Kaihua Pan,Weihao Zhu,Yanni Huang,Changchang Wang,Hongfei Liu,Qian Li,Qian Zhu,Junqiang Hu,Mingliang Zhang,Jiguo Qiu,Xin Yan,Qing Hong
3,5-Dichloroaniline (3,5-DCA) is extensively used in synthesizing dicarboximide fungicides, medical compounds and dyes. Due to its widespread use in agriculture and industry, 3,5-DCA is often detected in groundwater, wastewater, sediments and soil, posing great risk to animals and humans. However, the genes and enzymes involved in 3,5-DCA degradation remain unidentified. In this study, 3,5-DCA-degrading activated sludge was obtained through 90 days of alternating anaerobic-anoxic acclimation. Microbial community analysis and further study revealed that Dehalobacter sp. DH-1 (OTU10) can convert 3,5-DCA to 3-chloroaniline anaerobically. Pseudomonas sp. DCA-1 (OTU58) can degrade 3,5-DCA, 3-chloroaniline and 2,5-dichloroaniline aerobically. Two gene clusters, ddoA1A2A3A4 and ddoBCDE , responsible for 3,5-DCA degradation, were identified via transcriptome analysis and heterologous expression. The dioxygenase genes of cluster ddoA1A2A3A4 convert 3,5-DCA to 3,5-dichlorocatechol, while those of cluster ddoBCDE mineralize the latter. Ultimately, the iprodione-degrading gene cluster ipaH-ddaH-duaH (responsible for sequential hydrolysis of the dicarboximide fungicide iprodione to 3,5-DCA) was introduced into strain DCA-1 to construct a genetically engineered microorganism, named strain IHC-DCA-1, that is capable of completely degrading iprodione. This study reveals the degradation mechanism of 3,5-DCA and provides potential strains to remediate 3,5-DCA and iprodione in the environment.
研究领域:
环境科学
·
微生物学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Yongqing Zhang,Hien Phuong Tran,Xiaodong Du,Imtyaz Hussain,Shaobin Huang,Shaoqi Zhou,William Wen
In recent years, persulfate activation systems have received increasing attention due to their high oxidation reactivity when removing environmental pollutants. Pyrite, the most common metal sulfide on Earth’s surface, can supply abundant Fe 2+ for persulfate activation. The role of the generated reactive oxygen species (ROS) in persulfate-pyrite systems however, is not fully understood. In this study, batch experiments were used to investigate p -chloroaniline (PCA) degradation by a pyrite-persulfate system. The effects of pyrite dosage, pH, temperature, air conditions (aerobic vs. anaerobic) and pyrite particle size on PCA degradation were examined. Radical detection was conducted using electron paramagnetic resonance (EPR) methods. Results from the EPR spectra indicated that PCA degradation was achieved by sulfate radical and hydroxyl radical oxidation. Aerobic conditions were more beneficial to PCA degradation than anaerobic conditions due to the generated superoxide radicals (O 2 − ) that activated the persulfate to produce more sulfate radicals (SO 4 − ). PCA degradation also increased with higher pyrite doses and under acidic conditions (pH 3.0 and 5.0). PCA was removed completely at pH 3.0 after 60 min. Temperature increase from 10 to 50 °C significantly promoted PCA degradation. These findings provide new understanding of the mechanism involved in pyrite activation of persulfate which can be used to improve PCA degradation by pyrite-persulfate systems.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 7
·3879-3886
·
IF 1.093
Liu Baoliang,Yang Bing,Sun Meiyu,Qian Xiangli,Zhang Qikun
In this study, a Pt loaded active carbon fiber (Pt/ACF) catalyst was prepared by immobilizing Pt nanoparticles on ACF. The catalyst accelerated hydrogenation of p-chloronitrobenzene (p-CNB) to p-chloroaniline (p-CA) at lower temperature and atmospheric pressure,
resulting in approximately 100% yield and selectivity. Several factors that affect p-CA yield were investigated. The nitro reduction rate reached 100% under the optimal reaction conditions, indicating excellent selectivity of the prepared catalyst. This process will overcome the environmental
pollution problems associated with the traditional process, and is a green synthetic process.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2018
·
IF 5.08
Xiuyan Wang,Yanyan Cao,Husheng Yan
Chlorambucil, a chemotherapeutic agent, is usually administered orally to treat chronic lymphocytic leukemia and some other types of cancers in regimens of conventional and metronomic chemotherapies. However, the hydrolytic instability of chlorambucil is a major limitation in achieving the optimum therapeutic performance. In this work, mesoporous polymeric microspheres were prepared by free radical suspension copolymerization of methyl acrylate and divinylbenzene in the presence of porogen. Chlorambucil was loaded into the mesoporous polymeric microspheres through adsorption of the drug in aqueous media with high loading capacity up to more than 350 mg/g. Chlorambucil-loaded mesoporous polymeric microspheres showed sustained release property in media simulating gastrointestinal fluids, with nearly zero order release kinetics. Furthermore, the mesoporous polymeric microspheres as carriers greatly stabilized chlorambucil against its hydrolysis. The hydrolyzation percentage of chlorambucil that was adsorbed on the microspheres after incubation for 36 h in media simulating gastrointestinal fluids was less than 10%, while more than 90% of free chlorambucil hydrolyzed after incubation in the same media for 4 h. The chlorambucil-loaded mesoporous polymeric microspheres may be used as oral sustained release formulations, especially as oral formulations for the application in metronomic chemotherapy.
研究领域:
药剂学
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Haibo Li,Zujin Yang,Jingnan Zhang,Yongchao Huang,Hongbing Ji,Yexiang Tong
Semiconductor photocatalysis is a promising method to remove the harmful compounds into harmless molecules. Herein, In-doped BiOI (In-BiOI) photocatalysts with highly exposed dominant {001} facets were synthesized through a facile hydrothermal method. The XRD, SEM and TEM determinations revealed the high crystallinity structure of the samples, and the XPS results confirmed the doping of In. The In-BiOI nanosheets exhibited a higher activity in the photodegradation of p -chloroaniline (PCA) than that of pristine BiOI, among which the In-2 BiOI sample (feed mole ratio of In:Bi = 2%) possessed the best performance. Doping with In didn’t alter the structure, morphology, specific surface area or light absorption capacity of BiOI, but significantly improved its charge separation efficiency and transport capability, which were verified by the results of the lower PL emission, larger photocurrent intensity and smaller arc radius of EIS plots. More importantly, the mechanism of photocatalytic degradation is studied systematically, revealing that O 2− and h + were the major reactive species during the photodegradation process. Finally, the possible role of In-doping in enhancing the photocatalytic performance of BiOI is proposed.
研究领域:
材料科学
·
环境科学
✓ 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）