Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Xin Li,Yuling Shan,Xiaolei Zhang,Shilei Zhao,Wenlong Yu,Yibin Liu,Hongrui Shang,Peilong Tang,Shusen Wang,Junwei Ding
Both increasing emission of chlorophenol chemicals and plastic waste pollution are severe global environmental challenges, which is worth being explored to respond with a "waste eliminated by waste" coupling treatment strategy. Herein, we propose a one-step recyclable nano-MgO template strategy to prepare in-situ N, O-doped novel porous carbon coral reefs (PCNCR) directly derived from the mixture of real waste PET and melamine formaldehyde resin. The template precursor can be conveniently recycled by facile acetic acid pickling, vacuum evaporation and drying, and the whole preparing process does not involve any toxic solvents, massive consumption of pore-forming agents, or discharge of salty wastewater. The obtained PCNCRs have hierarchical porous structures and abundant N, O-doped species, and the textural parameters can be modulation linearly by varying the mass ratio of magnesium acetate to mixed waste plastics. The optimized PCNCR-1.25 exhibited remarkable adsorption capacity for chlorophenol contaminants (777.5 mg/g for 4-Chloro-3,5-dimethylphenol, PCMX and 538.74 mg/g for 4-Chloro-3-methylphenol, PCMC) in aqueous solution. Adsorption isotherm fitting studies revealed chlorophenol contaminants tended to be rapidly adsorbed on the PCNCR surface in the form of monolayer. And the system reached adsorption equilibrium at about 15 min, which was described by linear driving force model. Reusability test verified that PCNCR-1.25 had excellent adsorption stability for chlorophenol in continuous adsorption-regeneration cycles. DFT calculation illustrated the enhancement of chlorophenol adsorption by heteroatom species, especially nitrogen dopants. This work highlighted a low-cost and sustainable approach to defuse the dual environmental threat of chlorophenol emissions and plastic waste pollution simultaneously.
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Analytical Methods
·
2021
·Vol. 13
·期 11
·1404-1411
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IF 2.896
Wenxue Xu,Yufeng Hu,Minghuo Wu,Enming Miao,Hao Zhou,Xuwang Zhang,Jingjing Zhan
A method consisting of solid-phase isotope dansylation (derivatization with dansyl chloride) and liquid chromatography-high resolution mass spectrometry (LC-HRMS) was developed for the quantitative analysis of phenolic compounds (phenols) in environmental samples. A magnetic-HLB (hydrophilic lipophilic balanced) material was synthesized and applied as an adsorbent in magnetic solid-phase extraction (MSPE) for the enrichment of the analytical targets. Furthermore, with the solid-phase isotope labeling, the desalting and removal of labeling residuals could be simplified over conventional in-solution labeling. In addition to overcoming the matrix effect by isotope dansylation, the sensitivity for the analysis of phenols by LC-HRMS was remarkably improved by over 100-fold. The method was systematically verified, and good accuracy (86.5–104.9%) and precision (<8.6% and <11.4% for intra- and inter-day, respectively) were achieved for the tested 15 phenols. The limits of detection (LODs) of this method were estimated to be 0.2–5 ng L−1 and 5–100 ng kg−1 in estuary water and sediment samples, respectively. With this method, samples collected from the Daliao River estuary (Panjin, China) were analyzed. It was found that all of the targeted phenols were detected at concentrations ranging from unquantifiable to 485 ng L−1 (the total concentration of analytes found in each sample were in the range 822–957 ng L−1) and unquantifiable to 1368 ng kg−1 (the total concentration of analytes found in each sample were in the range 2251–2992 ng kg−1) in water and sediment, respectively.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2017
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IF 3.981
Xinhong Yu,Wei Zhou,Zilin Chen
Layered double hydroxides (LDHs) have gained much attention in absorption and extraction fields due to their special structure and properties like high porosity, large surface area and excellent anion exchange capacity. However, LDHs are rarely used in capillary electrochromatography (CEC) by date due to the lack of appropriate immobilization method. In this work, by utilizing the unique coordination bonding between metal ions on LDHs and catechol groups on polydopamine layer, a polydopamine modification method was developed for in situ immobilization of LDHs on the inner surface of fused silica capillary. The formation of CoAl-LDHs on polydopamine-immobilized capillary has been characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. The CoAl-LDHs-modified open-tubular capillary exhibited good separation performance towards neutral compounds by cation-π interaction and hydrophobic interaction. More interestingly, by virtue of the coordination interaction between metal ions on LDHs layer and phenolic hydroxyl groups, the LDHs-modified capillary has shown good separation efficiency towards various phenolic compounds. Repeatability of the column was studied, with the relative standard deviations for intra-day, inter-day and column-to-column lower than 4.3%.
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JOURNAL OF CHROMATOGRAPHY A
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2025
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IF 4
Ning Zhu,Zhichen Liu,Qiulin Zhang,Man He,Beibei Chen,Bin Hu
3D printing is an additive manufacturing technology based on digital model files. 3D printing has become a popular manufacturing tool in various fields. Stereolithography offers a series of advantages compared to its counterparts, such as smooth prints, appropriate resolution in all the axes, acceptable organic solvent compatibility and sufficient tightness to the flowing of solutions/solvents at moderate/high pressure. Thus, this work used stereolithography and clear resin (polymethyl methacrylate resin and epoxy resin) to prepare stir bars’ coatings, which reduced the size of the fabricated stir bar (1 mm) and no swelling property in organic solvents. In this work, three types of structures were designed as the coatings of stir bars, which were solid, discal, and lattice coatings with equal mass (0.13 g). Because of the largest surface area, lattice coatings were chosen to be make clear resin stir bars. The clear resin stir bars were used for stir bar sorptive extraction and combined with high performance liquid chromatography to develop a new method, which was successfully applied to detect four chlorophenols in environmental water samples. Compared with the previous work using melt deposition modeling 3D printing, this work could print hollow structures with higher precision. The stir bars could have higher rotational speed (700 rpm vs 350 rpm), smaller desorption volume (500 μL vs 2 mL), and shorter extraction time (60 min vs 90 min). The stir bars also had excellent mechanical performance and long lifetimes of up to 160 times. LODs of this method were between 0.30 μg/L (2-CP) and 0.97 μg/L (2,4,6-TCP) (S/N=3), which were below the concentration limits of surface water samples. Relative standard deviations of the stir bars were 1.4-3.9% (n=7, c=10 μg/L).
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ORGANIC ELECTRONICS
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2015
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IF 3.827
Zhangping Xu,Xiaoming Chen,Sai Mi,Jianming Zheng,Chunye Xu
A series of solution-processable red-to-transmissive electrochromic polymers P1, P2 and P3 were designed and synthesized through chemical oxidative copolymerization approach, wherein the mole ratio of 3,4-di(2-ethylhexyloxy)thiophene to 3,4-ethylenedioxythiophene) were 6:1, 2:1 and 1:1, respectively. Their maximum absorption wavelength in the neutral state vary with incorporation ratio of 3,4-ethylenedioxythiophene, giving rise to tunable colors. All polymers exhibit decent solubility in conventional organic solvents , high optical contrast ranging from 51% to 57% and good stability. These excellent comprehensive electrochromic performances make them as promising candidates for large area electrochromic device applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2016
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IF 3.299
Yue Zhang,Zhiyong Li,Huiyong Wang,Xiaopeng Xuan,Jianji Wang
Phenolic compounds are an important class of compounds for organic chemical industry. In their traditional production processes, strong acid and base have to be used for the separation of phenolic compounds from oils, which often causes serious environmental problems. In this work, choline derivative salts [N 1,1, n C 2 OH]Cl ( n = 1, 4, 6, 8) have been used as new extractants for the separation of 26 kinds of phenolic compounds from model oil (toluene) by forming deep eutectic solvents (DESs). It is found that only 16 kinds of phenolic compounds can be removed from toluene with single-step removal efficiency from 28.1% to 94.7%, strongly depending on the chemical structure of phenolic compounds. The nature, position and number of substituent groups in the phenolic compounds have a great effect on their removal efficiency. Far infrared spectroscopy and density functional theory calculations indicate that hydrogen bonds formed between –OH of the phenolic compounds and anion of the choline derivative salts is the main driving force for such DES-based separation. The correlation observed experimentally between structure of phenolic compounds and their removal efficiencies has been discussed from hydrogen bonding in DESs, electrostatic interaction of cation and anion of the choline salts, and solvation of the phenolic compounds and choline salts in the oil.
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高影响因子
ANALYST
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2013
·Vol. 139
·期 1
·242-250
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IF 3.969
Juan Zhang,Wenpeng Zhang,Tao Bao,Zilin Chen
A novel capillary with hydroxyapatite (HAP) as the stationary phase was prepared for open-tubular capillary electrochromatography (OT-CEC). To immobilize HAP, a mussel-inspired polydopamine method was utilized to modify the capillary firstly, generating a polydopamine layer; and then a layer of HAP would be formed on the polydopamine layer by a biomineralization process, to produce a HAP-modified capillary (HAP@capillary). Scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS) provided evidence of nanostructured HAP grown on the surface of the capillary wall. The electroosmotic flow (EOF) characteristic of the HAP@capillary was investigated by varying the percentage of acetonitrile and pH value of the buffer with thiourea as a marker, and a pH-dependent EOF from anode to cathode was observed. The HAP@capillary exhibits high column efficiency for methylbenzene, up to 151 138 plates per meter. Different kinds of compounds including alkylbenzenes, phenols and amines have been successfully separated by the HAP@capillary in CEC mode. The HAP@capillary also possessed good separation ability in capillary liquid chromatography (CLC) mode because of the relatively large ratio of HAP in the capillary; however, the separation efficiency was not as good as that in CEC mode. The reproducibilities of the HAP@capillary were evaluated, and the relative standard deviations were found to be lower than 5%.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Yang Zheng,Tongkui Yue,Guanghui Cui,Yi Sun,Wei Liu,Jun Liu,Zhanpeng Wu
The interfacial interaction between fibers and polyphosphazene is a crucial factor for efficient ablative resistance. Herein, a series of polyphosphazenes with aryloxy and substituted-aryloxy side groups were designed and synthesized, guided by molecular dynamics simulation. Effects of the type and position of the substitutions on properties of polyphosphazenes such as glass transition temperature (Tg) were investigated. The introduction of polar chlorine-substituted side groups increases the interfacial interaction of polyphosphazenes with fibers, as evidenced by the binding energy and the number of hydrogen bonds, and the composites exhibited enhanced mechanical and ablative properties. The linear ablation, mass ablation, and charring rate of the composite reach 0.0148, 0.041, and 0.088 mm/s, respectively, which is superior to the composites using conventional rubbers as the matrix. These results make the chlorinated polyphosphazene a competitive candidate for thermal protection under the high-temperature service environment of vehicles and rockets.
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危险品化学品经营许可证（带存储）