SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Chengfang Zhang,Zhenyu Song,Chao Li,Qinglong Liu,Jingchun Tang
In the actual polluted environment, the composite pollution system was usually composed of heavy metals and organic pollutants, especially Cr(VI) and chlorophenols often co-existed in industrial wastewater. In this study, a composite material consisting of multilayer graphene carbon shells coated with nZVI (gBC@nZVI) with various excellent properties was applied to deal with the composite system of Cr(VI) and 2,4-dichlorophenol (2,4-DCP) coexisting in the wastewater, and the intrinsic mechanism for the simultaneous removal of heavy metals and organic pollutants was systematically investigated. The results showed that in the composite pollution system (Cr(VI) = 20 mg/L, 2,4-DCP = 15 mg/L), complete removal of Cr(VI) could be achieved in 60 min, while 2,4-DCP achieved 95.2 % removal, with the contribution of oxidative degradation being 76.4 %. It was found that during the efficient adsorption and reduction of Cr(VI) by gBC@nZVI, the generation of the metastable intermediate Cr(V) was verified by probe compounds, electron spin resonance and UV–visible spectroscopy, and further experiments demonstrated that the generation of •OH was closely related to Cr(V) and promoted the oxidative degradation of the coexisting 2,4-DCP. Quenching experiments with the addition of specific scavengers indicated that •OH was the active species directly dominating the oxidative degradation of 2,4-DCP, whereas Cr(V) was indirectly involved in the degradation of 2,4-DCP by promoting the generation of •OH. In addition, the increase of solution pH negatively affected the degradation of 2,4-DCP in the composite polluted system, mainly due to the hindered generation of •OH in the alkaline environment. This work provided theoretical support for the promising application of gBC@nZVI in real environments contaminated with a combination of Cr(VI) and chlorophenols.
研究领域:
环境科学
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水处理技术
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污染控制
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Huazangnaowu Bai,Ruiqi Qiao,Fang Xiao,Jiawen Li,Baiyi Zu,Zhenzhen Cai
Due to the severe interference from analogues such as hydrochloric acid, it is of great significance to establish a highly reliable technique to enhance the discrimination ability toward diethyl chlorophosphate (DCP). Here, based on the electrophilicity of DCP, a series of zero-background fluorescence Schiff base materials with different densities of C═N bonds as recognition sites were designed and synthesized by modulating the chain length. It is found that the increase of the C═N bond density and the specific surface area could improve the collision efficiency with DCP, thereby improving the response speed. When the density of C═N bonds is 3.86 × 1021/cm3 and the specific surface area is 128.5 m2/g, DFDBA-POP demonstrated a more superior sensing performance toward the target analyte, including the ability to detect gaseous DCP, a rapid response (1 s), and superior selectivity even in the presence of 15 kinds of interferents including the very similar hydrochloric acid. Moreover, the practicality of DFDBA-POP was further verified by a DFDBA-POP solid-state sensor, which is capable of specifically identifying gaseous DCP. The present nonfluorescent Schiff base materials design and modulation strategy would open up a new gate for the rational design of high-performance fluorescent materials to detect and discriminate trace hazardous substances with similar structures and properties.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
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IF 4.019
Xinyue Gu,Jie Mei,Jiahao Lai,Siying Lv,Jing Yang,Shihai Cui,Sen Chen
In view of the deterioration of the environment and the shortage of resources, it is necessary to develop efficient photocatalysts for the degradation of organic pollutants. Herein, a novel and environmentally friendly ZnNb 2 O 6 /g-C 3 N 4 heterojunction nanocomposite was synthesized by calcination-hydrothermal method successfully. The chemical and physical capabilities of the material were characterized by various kinds of analytical instruments. Compared with ZnNb 2 O 6 and g-C 3 N 4 , ZnNb 2 O 6 /g-C 3 N 4 showed the strongest photocatalytic activity. The nanomaterial was used in the removal of the pollutant 2,4-DCP. The effects of degradation conditions were discussed including component ratio, material dosage, initial analyte concentration, pH and salinity. After 180 min’ simulated sunlight illumination, the removal efficiency of 2,4-DCP (10 mg/L) reached 95.7% under the optimum condition. Furthermore, the possible photocatalytic mechanisms were discussed according to four aspects: (i) The conformation of the active species; (ii) The calculation of valence and conduction band; (iii) The analysis Z-scheme heterojunction mechanism; (iv) The speculation of feasible photocatalytic paths. In conclusion, the ZnNb 2 O 6 /g-C 3 N 4 (ZC-7) nanocomposite has the least recombination rate of electron-hole pairs and the highest photocatalytic efficiency.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Guoguan Liu,Shan Zhong,Lishan Zhang,Hangyu Shi,Qian Zhang,Xuan Ru,Yifu Li
This work successfully synthesized Bi@Bi 2 WO 6 with oxygen vacancies (OVs) through chemical etching and systematically revealed the coupling mechanism between OVs and piezoelectric effects. In the piezo-photocatalytic degradation of 2,4-dichlorophenol (2,4-DCP), the 0.1al-BBW sample exhibited the best performance, with an apparent rate constant of 0.05468 min −1 . ERS and PFM characterizations revealed that abundant OVs were introduced by etching, leading to lattice modification and improved piezoelectric polarization. According to density functional theory (DFT) results, the piezoelectric field optimizes charge localization at OVs, strengthens band coupling, reduces carrier recombination, and facilitates the activation of H 2 O and O 2 . Furthermore, Mott-Schottky results and stress-induced simulations (0–8 %) confirmed that both piezoelectric polarization and OVs contribute synergistically to energy band restructuring. Pathway analysis showed that 1 O 2 and h + were the dominant reactive species driving the two main routes of 2,4-DCP decomposition. Overall, this work offers mechanistic insights into OVs coupling with piezoelectric and presents a viable strategy for designing advanced piezo-photocatalysts with multifunctional capabilities.
研究领域:
材料科学
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环境科学
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纳米技术
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催化
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理论化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2014
·Vol. 90
·期 5
·947-954
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IF 2.494
Yunfang Chen,Jianzhang Fang,Shaoyou Lu,Weicheng Xu,Zhang Liu,Xiaoxin Xu,Zhanqiang Fang
BACKGROUND Chlorophenols (CPs) are organic pollutants and are most widespread in the aqueous environment. Photocatalytic degradation of organic compounds has been extensively studied as a potential technology for water treatment. In this study, BiOI/Bi 2 WO 6 hierarchical heterostructure with flower-like morphology was synthesized by a facile method using a one-step hydrothermal approach. The catalytic activities of the photocatalysts were tested by the degradation of 2,4-DCP under visible-light irradiation and the photocatalysis mechanism of BiOI/Bi 2 WO 6 was investigated. RESULTS The as-prepared catalysts exhibited the characteristic peaks of BiOI and Bi 2 WO 6 . The photocatalytic activities, which were evaluated by degradation of 2,4-DCP under visible light irradiation, were enhanced significantly by BiOI/Bi 2 WO 6 hierarchical heterostructures with different molar ratios of BiOI to Bi 2 WO 6 . CONCLUSIONS BiOI/Bi 2 WO 6 hierarchical heterostructure significantly enhanced the photocatalytic activity. The optimum percentage of BiOI was 10%. The optimal initial pH value of 2,4-DCP was determined to be pH 8. The possible reaction mechanisms were discussed on the basis of the calculated energy band positions. © 2014 Society of Chemical Industry
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Wenjie Zhu,Hong Qian,Shengya Cao,Wei Xia,Xilong Wang,Jing Jin,Xin Wang,Hao Zhang,Dongsheng Liu,Ying Chen
Background The early detection of Hepatocellular Carcinoma (HCC) is crucial for improving patient survival rates.Early diagnosis of HCC can significantly enhance treatment outcomes and reduce disease progression. Antigen detection of tumor markers is one of the important diagnostic methods for HCC. However, Traditional antigen detection methods often rely on heavy detection equipment, involve lengthy turnaround times, and must be conducted in laboratory settings. Therefore, there is a clear need for a portable, low-skill, rapid sample-to-result detection method for early HCC biomarkers. Results We propose a new platform based on electrowetting-on-dielectric digital microfluidic(EWOD-DMF) for the detection of early-stage HCC biomarkers, enabling the quantitative measurement of Alpha-Fetoprotein (AFP), the proportion of AFP-L3 in total AFP (AFP-L3%), and Des-Gamma-Carboxy Prothrombin (DCP). First, serum samples are processed through the microfluidic system, achieving the separation of AFP-L3 within 10 min. Next, immunoassays are performed within 15 min, using magnetic particles to capture biomarkers such as AFP, AFP-L3, and DCP, followed by enzymatic reactions that generate detectable signals. Each chip can simultaneously detect three biomarkers from five different samples, allowing for a total of fifteen targets to be tested, with only approximately 2.4 μL of serum required for each biomarker detection. Ultimately, data are analyzed with dedicated software to quantitatively measure the HCC biomarkers. The detection limits for AFP or AFP-L3 and for DCP are 0.24 ng/mL and 1.89 ng/mL, respectively. Significance This study presents a EWOD-DMF platform for early-stage HCC diagnosis, capable of simultaneously detecting multiple samples and biomarkers, thus improving detection efficiency and diagnostic accuracy. Moreover, the platform has POCT capability, with advantages in portability and cost-effectiveness, providing clinicians and primary healthcare institutions with a fast and convenient solution for early-stage HCC diagnosis.
研究领域:
医学工程
·
肿瘤学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Peng He,Jianyu Zhu,Yaozong Chen,Fang Chen,Jinglei Zhu,Mengfei Liu,Ke Zhang,Min Gan
Organic pollutants and heavy metals often coexist in wastewater, their simultaneous and effective removal from wastewater has a particular significance for environmental remediation. In this study, pyrite (FeS 2 ), the most abundant iron mineral in the Earth’s crust, was selected as a catalyst to activate persulfate for the simultaneous removal of 2,4-dichlorophenol (2,4-DCP) and Cr(VI), two common contaminants in wastewater. The results indicated that 76.2% of 2,4-DCP and 80.1% of Cr(VI) were simultaneously removed within 120 min in the pyrite/persulfate system. The simultaneous removal efficiency of 2,4-DCP and Cr(VI) by the pyrite/persulfate system was influenced by the contaminant concentration, solution pH and organic acids. The radicals SO 4 ·− and ·OH were detected as the oxidative species in the pyrite/persulfate combined system using electron spin resonance (ESR) spectroscopy, and quenching experiments with methanol and tert-butanol indicated that SO 4 ·− played a predominant role in the degradation of 2,4-DCP. The radicals (SO 4 ·− and ·OH) produced from the activation of persulfate by pyrite principally contributed to 2,4-DCP disintegration, while the removal of Cr(VI) was primarily attributed to the reduction ability of pyrite. Experiments and density functional theory (DFT) calculation results indicated that Fe is the main catalytic site, and the reductive sulfides of the pyrite surface mediated Fe 2+ recovery as donors during reaction processes. This work presented a ubiquitous natural sulfide mineral with excellent catalytic performance in the heterogeneous persulfate activation, implying a new strategy in wastewater treatment for simultaneous removal of heavy metal and organic compounds.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Xiaobo Wang,Shuailiang Wang,Kunzhu Huang,Zhiguo Liu,Yongju Gao,Wenbin Zeng
A novel nanosensor based on upconversion nanoparticles, NaYF 4 : Yb, Tm@NaYF 4 , covalently conjugated with fluorogen Rhodol (Rhodol-UCNPs) for the sensitive and point-of-care detection of organophosphonate nerve agent mimic DCP has been fabricated. This nanosensor exhibited upconversion luminescence turn-on and ratiometric detection ability of DCP with satisfactory response speed (within 40 s) and a detection limit of 0.21 μM. Under a 980 nm laser excitation, the blue emission of UCNPs was quenched due to the luminescence resonance energy transfer (LRET) between Rhodol and Tm 3+ doped UCNPs, while the presence of DCP led to the suspension of LRET, as a result, significant fluorescence recovery of UCNPs could be observed. Furthermore, we have developed paper-based devices for the point-of-care detection of DCP with naked eyes, both the color change and the blue fluorescence recovery could inform us the presence of DCP. Such convenient detection strategies have the potential to provide us early warnings of the existence possibilities of any risks from OP nerve agents and thus ensure us of our public security.
研究领域:
生物传感
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分析化学
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公共安全
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Zhefei Zhao,Xuyao Yao,Linlin Zhang,Minhao Chen,Xingyu Luo,Ruopeng Yu,Yinghua Xu,Youqun Chu,Xinbiao Mao,Huajun Zheng
Electrochemical selective dechlorination for the synthesis of high value-added chemical products is an economical and promising technology. Although silver (Ag) electrode is the most representative catalyst in most electrocatalytic dehalogenation reactions, the selectivity for specific reaction needs to be improved. In this framework, AgCu bimetallic electrocatalysts were designed for the selective dechlorination of 4-amino-3,5,6-trichloropyridine carboxylic acid (4-N-3,5,6-TCP) to 4-amino-3,6-dichloropyridolinic acid (4-N-3,6-DCP). The optimum Ag 16 Cu 4 electrode exhibits excellent performance with 99.0% selectivity and 98.8% yield of 4-N-3,6-DCP, surpassing the pure Ag electrode. The combined results of experimental measurements and theoretical calculations indicated that the introduction of Cu modulates the electronic structure of Ag, which not only promoted the transfer of charges, but also reduces the energy barrier of the rate-determining step (the C H formation). In addition, the practicality and scalability of this system was evaluated using a flow-cell reactor. This study demonstrates that AgCu bimetallic catalyst plays a crucial role in determining the selectivity and activity in the electrochemical dechlorination of 4-N-3,5,6-TCP and displays the prospective applications.
研究领域:
环境科学
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材料科学
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电化学工程
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Jian Wu,Dajun Ren,Shuqin Zhang,Wenting Liu,Xiaoqin Zhang,Xiangyi Gong
Organic pollutants in aqueous solutions may potentially be adsorbed on biochar. In this study, biochar was derived from the pyrolysis of chitosan at 800°C. The removal rate of 2,4-dichlorophenol (DCP) exceeded 80%. Investigations by Fourier transform infrared spectroscopy and Brunauer– Emmett–Teller indicated that the adsorption of organic pollutants on biochar tends to be a physical process. The optimized pH was 5. All three isotherm models involved (Freundlich, Koble–Corrigan, and Henry) could describe the adsorption process of 2,4-DCP well on chitosan-biochar, which was non-uniform surface adsorption in a diluted solution. The adsorption was an endothermic process. It took 40 min to reach the adsorption equilibrium, and kinetics of the Elovich equation and intraparticle diffusion (IPD) model indicated that the adsorption rate at the rapid adsorption stage was simultaneously controlled by surface diffusion and IPD and that at slow adsorption stage was controlled by surface diffusion. The ionic strengths suggested that electrostatic interaction was not the dominant mechanism during this process.
研究领域:
环境科学
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环境工程
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材料科学
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污染控制化学
·
吸附技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Kejian Li,Yang Yang,Aziz-Ur-Rahim Bacha,Yiqing Feng,Saira Ajmal,Iqra Nabi,Liwu Zhang
Halogenated organic compounds (HOCs) like chlorophenols (CPs) are one of persistent organic pollutants in environment, and it is an urgent issue to remove HOCs efficiently because they are detrimental to aquatic organisms and human beings. Electrocatalytic hydrodechlorination (ECH) technique has been widely studied to deal with chlorophenols. However, litter attention has been paid to the further treatment of the dechlorination product phenol. Meanwhile, photoelectrocatalysis is regarded as a promising method for contaminants elimination and water splitting using inexhaustible solar energy. Therefore, this study proposed a photoelectrochemical reductive hydrodechlorination and sequential oxidation method for thorough degradation of 2,4-dichlorophenol (2,4-DCP) using WO 3 /Mo-doped BiVO 4 as photoanode and Pd/Ni foam as cathode. Several factors such as Pd-loading amount, initial pH, overpotential, and Cl − that would influence the efficiency of 2,4-DCP hydrodechlorination and phenol oxidation have been investigated in detail. The 2,4-DCP could be completely hydrodechlorinated to phenol, and removal efficiency of the obtained phenol reached ~45% for 4 h reaction under optimized conditions. Additionally, there was no secondary chlorinated pollutant generated during the oxidation process even though the existence of Cl − . Lastly, the possible mechanism and degradation pathway were also explored based on LC-MS. This study proposed an efficient and environmental-friendly technique for complete degradation of chlorophenols, which might be also suitable for other HOCs and would be industrialized with the help of further studies.
研究领域:
环境科学
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电化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Minghui Wang,Mei Zhang,Zhuoyu Wen,Chaoqun Li,Shilin Zhao,Jun Ma,Yang Liao,Xiaoting Li
Chlorophenols have been frequently detected in the environment, posing potential threats to both the natural ecosystem and human health. Semiconductor photocatalytic degradation of chlorophenols has become a prominent research focus. However, the development of high-performance and stable photocatalysts remains challenging. In this work, the nitrogen-modified ceria (N-CeO 2 ) was optimally prepared by microwave-assisted method and utilized for photocatalytic degradation of 2,4-DCP. The CeO 2 photocatalyst with 10% nitrogen doping (10% N-CeO 2 ) prepared under the optimal condition (microwave power of 560 W for 2 min and calcination temperature of 400 °C for 2 h) degraded 2,4-DCP with the highest removal efficiency of 93.51%. It was identified that the optimally prepared 10% N-CeO 2 photocatalyst had the nanometer size with surface imperfections and increased BET surface, and showed strongest photocurrent response and lowest charge transfer resistance among all the prepared materials. Additionally, an analysis of the band gap structure revealed that the band gap of 10% N-CeO 2 decreased from 3.05 eV (for pure CeO 2 ) to 2.42 eV, resulting in enhanced light absorption capacity. The radical trapping experiments and electron paramagnetic resonance (EPR) proved that the active species contributed to the degradation of 2,4-DCP mainly as •OH, •O 2 - . The potential photocatalytic degradation mechanism of 2,4-DCP was a continuous dechlorination and hydroxylation process with complete mineralization of the pollutant to CO 2 and H 2 O. This work can provide a feasible way to prepare high-efficiency nitrogen-doped ceria photocatalysts with great potential for the removal of chlorophenols.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）