SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Pengwei Yan,Jimin Shen,Shuyu Wang,Yanchi Zhou,Jing Kang,Lei Yuan,Lanbo Bi,Yabin Li,Zhonglin Chen
CuO as a heterogeneous catalyst was synthesized by calcination method and characterized via various technologies. A series of metal oxides were synthesized by the same process to compare the catalytic performance. The CuO activated peroxymonosulfate (PMS) catalytic system can effectively degrade 2, 6-dichlorophenol (2,6-DCP). The effect of the calcination temperature on CuO performance was investigated, which showed that the catalytic performance was the highest at a calcination temperature of 400 °C. The effect of various factors such as catalyst dose, PMS dose, solution pH, NOM concentration and inorganic ions (Cl − , NO 3 − , SO 4 2− and HCO 3 − ) on the removal of 2, 6-DCP were probed. SO 4 − and OH play the predominant role for the degradation of 2, 6-DCP. According to the kinetic calculation of the quantitive experiment by nitrobenzene and benzoic acid, the generation concentrations of OH and SO 4 − can reach 5.92 × 10 −13 mol/L and 7.92 × 10 −13 mol/L, respectively. The degradation mechanism of 2, 6-DCP main including OH substitution for Cl atom, ring-opening and mineralization.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Zongtang Liu,Congcong Ding,Pingting Gao,Yunxia Xu,Yufeng Sun,Xiaoju Wen,Jingtao Dai,Zhenghao Fei
For the first time, the dechlorination of 2,6-dichlorophenol (2,6-DCP) by carbon nanotubes supported Fe/Ni nanoparticles (CNTs-Fe/Ni) was studied to explore the practicability of environmental remediation. Removal capacity of CNTs-Fe/Ni for 2,6-DCP was enhanced obviously compared to Fe/Ni due to reduced aggregation of Fe/Ni nanoparticles .The removal efficiency increased as the increase of CNTs-Fe/Ni dosage and Ni loading, whereas it decreased as the increase of 2,6-DCP concentration. Weak acidic condition was considered to be advantageous to 2,6-DCP dechlorination. The dechlorination kinetics results suggested that the 2,6-DCP removal by CNTs-Fe/Ni accorded with pseudo-first-order equation. Moreover, carbon nanotubes as support accelerated the mass transfer of 2,6-DCP from solution to catalyst surface and promoted the formation of atomic hydrogen, which also led to an enhancement of reactivity of CNTs-Fe/Ni on removing 2,6-DCP.
研究领域:
环境科学
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纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Mengyu Zhu,Jun Lu,Linchang Dong,Shuheng Hu,Shuchuan Peng,Chengzhu Zhu
The possible photochemical transformation pathways of chlorophenols (2, 6-dichlorophenol and 2-chlorophenol) with superoxide anion radical (O 2 ·− ) were studied by steady-state irradiation and 355 nm laser flash photolysis technique. O 2 ·− was generated by irradiating riboflavin O 2 -saturated solution with an UVA light (maximum at 365 nm). The steady-state experimental results suggested that the transformation efficiency of chlorophenols improved with the increase of the initial riboflavin concentration and solution initial pH value, while the increase of chlorophenols concentration would inhibit the photochemical reaction. The second-order rate constant of the reaction of O 2 ·− with 2, 6-DCP phenoxyl radical (2, 6-DCP · ) and 2-CP phenoxyl radical (2-CP · ) were determined as (8.39 ± 0.99) × 10 9 L mol −1 s −1 and (5.17 ± 0.68) × 10 9 L mol −1 s −1 by laser flash photolysis techniques, respectively. The transformation of chlorophenols was accompanied by the formation of Cl − induced by superoxide radicals after the mixed riboflavin and chlorophenols solution with UVA irradiation. The main conversion products of the reaction between 2, 6-DCP and O 2 ·− were identified by GC-MS, as 2-chlorophenol, 2, 6-dichloro-1, 4-benzoquinone, 2, 6-dichloro-hydroquinone and 3-chlorocatechol, while 2-CP with O 2 ·− was 2-chloro-1, 4-benzoquinone, 2-chlorohydroquinone and phenol, respectively. The transformation pathways of 2, 6-DCP and 2-CP with O 2 ·− were also proposed.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Jinyue Zhang,Dandan Wang,Yue Li,Junfu Wang,Dan Bai,Chuanwei Zhou,Jiawei He,Shuyun Shi,Hongji Li
MIPs and surface enhanced Raman scattering (SERS) technology are combined to construct a new type of sensor for selective detection of chlorophenols. The SERS substrates are synthesized by loading Ag nanoparticles on MIL-101 (Fe). Then, the Ag@MIL-101 (Fe)@MIPs is obtained by precipitation polymerization with using 2,6-DCP as the template and acrylamide as the functional monomer. The synthesized MIL-101 (Fe) is found to be an octahedral structure. The prepared Ag@MIL-101 (Fe)@MIPs shows huge SERS activity. In the range of 10 −3 -10 −9 mol/L, the prepared sensor for detecting 2,6-DCP has a linear relationship between SERS intensity at the peak of 1575 cm −1 and 2,6-DCP concentration, the detection limit is 4.5 nmol/L, and the imprinting factor is 2.2. The sensor is used for actual sample analysis, with a recovery rate of 96.58%–105.56%, and a relative standard deviation (R 2 ) of 1.355%–3.861%. The metal MOF-based nanocomposite prepared in this study can be used as a promising SERS substrate material. This method which is combined by MIPs and SERS provides a new detection method for the detection of 2,6-DCP and other chlorophenols, and expandes new technical fields.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Xiyue Wang,Shang Gao,Junfu Wang,Xinying Fan,Chi Song,Chuanwei Zhou,Shuyun Shi,Dandan Wang,Hongji Li
In this work, a novel sensor for selective detection of 2,6-dichlorophenol (2,6-DCP) is developed by combining the selectivity of molecular imprinting technology (MIPs) with the sensitivity of SERS technology. In order to enhance SERS activity of the substrate, Ag nanoparticles are loaded on Ta 2 O 5 particles by means of photodeposition. The synthesized Ta 2 O 5 @Ag is combined with MIL-101 (Fe) to enrich more target molecules and reduce the limit of detection. Finally, Ta 2 O 5 /Ag/MIL-101(Fe)@MIPs (TAM@MIPs) is synthesized by precipitation polymerization for selective detection of 2,6-DCP. When the concentration of 2,6-DCP changes between the range of 10 −2 ∼ 10 −9 M, the Raman intensity and concentration present a good linear relationship. The correlation coefficient (R 2 ) is 0.9969 and the limit of detection (LOD) of 2,6-DCP is 10 −9 M. Furthermore, Under UV-irradiation, the TAM@MIPs also presents photocatalytic performance, which can effectively degrade the organic interfering molecule adsorbed on its surface and present high-efficiency reproducibility. This method broadens the application field of SERS detection and provides a new procedure for the phenolic pollutant detection.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2017
·Vol. 49
·期 2
·222-229
·
IF 2.969
Hongji Li,Zirun Wang,Xiaonan Wang,Jiaqi Jiang,Jiahong Zheng,Yongsheng Yan,Chunxiang Li
In this study, a novel detection method based on the technique of surface enhanced Raman scattering (SERS) was presented. Firstly, the homogeneous Ag particles were prepared and CdTe quantum dots were modified on the surface of Ag particles to synthesize the Ag/CdTe heterostructures as the SERS substrate. Then 2,6-DCP was chosen as the template molecule and combined the technique of atom transfer radical polymerization to prepare Ag/CdTe/molecular imprinted polymers (MIPs). Through characterization analysis, it was proved that the Ag/CdTe/MIPs exhibited splendid SERS properties and selectivity. Under the optimal condition, it was presented good linear relationship (R 2 = 0.96) between the Raman signal (at 1596 cm −1 ) and the concentration of the templates, and the detection limit was determined as 10 −9 mol L −1 . It was envisaged that the sensitivity of SERS coupled with the selective properties of MIPs could induce a promising chemosensor for practical applications.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Hongji Li,Yan Wang,Yue Li,Yu Qiao,Lihui Liu,Qingwei Wang,Guangbo Che
This study describes the preparation of a novel multilayer sensor based on molecularly imprinted polymers (MIPs) for the detection of trace-level chlorophenols by surface-enhanced Raman scattering (SERS). Composites of SiO 2 /reduced graphene oxide/gold (SiO 2 /rGO/Au, SGA) are chosen as the SERS substrates. The fabricated composites are able to enhance the SERS sensitivity, and the addition of MIPs improves the selectivity of traditional SERS substrates. Furthermore, the sensor's detection sensitivity and selectivity are improved by including two functional monomers , namely methacrylic acid (MAA) and acrylamide (AM) containing different functional groups. Finally, in to more effectively balance the selectivity of MIPs shell and the sensitivity of SERS detection, the prepared substrates are surface-modified with polydopamine (pDA) and prepared by atom transfer radical polymerization (ATRP). It is confirmed that the prepared SGA-MIPs exhibits relatively good sensitivity and selectivity in the detection of chlorophenols. Importantly, all the investigations are conducted in environmentally friendly aqueous solution, which enables scaling-up without causing pollution.
研究领域:
分析化学
·
环境科学
·
纳米技术
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）