Co-reporter:Xuemei Wang, Huan Wang, Pengfei Huang, Xiaomin Ma, Xiaoquan Lu, Xinzhen Du
Journal of Chromatography A 2017 Volume 1479(Volume 1479) pp:
Publication Date(Web):6 January 2017
DOI:10.1016/j.chroma.2016.12.010
•A order mesoporous polymers with Ia-3d bicontinuous cubic structure was synthesized.•The novel materials was prepared on the stainless steel wire as SPME fiber.•The fiber was used for the determination of seven chlorophenols in water samples.•The developed method was simple, fast, sensitive, and accurate.A superior solid-phase microextraction (SPME) fiber-coating material, three dimensional order mesoporous polymers with Ia-3d bicontinuous cubic structure (3D-OMPs) was in situ coated on a stainless steel wire by solvent evaporation induced self-assembly (EISA) and thermo-polymerization. Fourier-transform infrared spectrometry (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), small-angel X-ray diffraction (SAXRD), N2 adsorption-desorption transmission, and thermogravimetry analysis (TGA) were applied to the characterization of the synthesized 3D-OMPs coating. The performance and feasibility of the homemade fiber was evaluated through direct immersion (DI) SPME followed by high-performance liquid chromatography-UV detector (HPLC-UV) for the simultaneous extraction of seven chlorophenols in water samples. Under the optimum conditions, the prepared fiber exhibited excellent extraction properties as compared to three commercial fibers, the DI-SPME-HPLC-UV method showed low limits of detection (0.32–1.85 μg L−1), wide linear ranges (5.0–1000 μgL−1), and acceptable reproducibility (relative standard deviation, RSD < 7.6% for one fiber, RSD < 8.9% for fiber to fiber). Moreover, the method was further successfully applied to the analysis of seven CPs in real samples with good recoveries (80.5–99.5%) and satisfactory precisions (RSD < 9.2%). It was confirmed that the proposed method has high sensitivity, outstanding selectivity and good reproducibility to the determination of trace CPs in the environmental water.
Co-reporter:Xuemei Wang, Pengfei Huang, Xiaomin Ma, Huan Wang, Xiaoquan Lu, Xinzhen Du
Talanta 2017 Volume 166() pp:300-305
Publication Date(Web):1 May 2017
DOI:10.1016/j.talanta.2017.01.067
•Novel magnetic core-shell mesoporous molecularly imprinted polymers were prepared.•The unique materials have specific selectivity and high adsorption capacity toward TBBPS.•The proposed method will be applied for determination of specific toxic substances in real samples.Novel magnetic mesoporous molecularly imprinted polymers (MMIPs) with core-shell structure were prepared by simple surface molecular imprinting polymerization using tetrabromobisphenol-S (TBBPS) as the template. The MMIPs-TBBPS were characterized by fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption transmission, and vibrating sample magnetometry. The resultant MMIPs-TBBPS were successfully applied magnetic solid-phase extraction (MSPE) coupled with HPLC determination of TBBPS in spiked real water samples with recoveries of 77.8–88.9%. The adsorption experiments showed that the binding capacity of MMIPs-TBBPS to TBBPS and six structural analogs were significantly higher than that of the magnetic nonimprinted polymers (MNIPs). Meanwhile, the MMIPs-TBBPS possessed rapid binding affinity, excellent magnetic response, specific selectivity and high adsorption capacity toward TBBPS with a maximum adsorption capacity of 1626.8 µg g−1. The analytical results indicate that the MMIPs-TBBPS are promising materials for selective separation and fast enrichment of TBBPS from complicated enviromental samples.
Co-reporter:Xuemei Wang, Huan Wang, Muxin Lu, Ruiju Teng, Xinzhen Du
Materials Chemistry and Physics 2017 Volume 198(Volume 198) pp:
Publication Date(Web):1 September 2017
DOI:10.1016/j.matchemphys.2016.12.017
•A magnetic graphene/mesoporous silica with hierarchical bridge-pore structure was synthesized.•The unique materials solve a problem of graphene retrieval or separation from solution.•The novel composites exhibited superior adsorption capacity for toxic pesticides.Novel phenyl-modified magnetic graphene/mesoporous silica (MG-MS-Ph) composites with hierarchical bridge-pore structure were successfully synthesized. The magnetic graphene (MG) as bridge were obtained by one-step solvothermal approach and then phenyl-functionalized mesoporous silica (MS-Ph) as pore modified the MG surfaces through one-pot facile strategy. The resulting MG-MS-Ph exhibited large surface area (446.5 m2g−1), highly ordered mesopores with uniform pore size (2.8 nm) and pore volume (0.32 cm3g−1) and higher saturation magnetization (25 emu g−1). These wonderful features made MG-MS-Ph as a promising magnetic solid-phase extraction adsorbent for the removal of pesticides from wastewater. Batch adsorption studies indicated that the novel composites exhibited superior adsorption capacity of pesticides compared with other adsorbents including Activated carbon, Multi-walled carbon nanotube and Single-walled carbon nanotube. Therefore, MG-MS-Ph as a low cost and efficient adsorbents for the removal of toxic pesticides would be economically and technically feasible.Download high-res image (253KB)Download full-size image
Co-reporter:Xuemei Wang, Muxin Lu, Huan Wang, Pengfei Huang, Xiaomin Ma, Chun Cao and Xinzhen Du
New Journal of Chemistry 2016 vol. 40(Issue 7) pp:6308-6314
Publication Date(Web):09 May 2016
DOI:10.1039/C5NJ03652F
Graphene aerogel–mesoporous carbon (GA–MC) composites with three-dimensional (3D) hierarchical nanostructures were synthesized using a nanocasting technique. The honeycomb-like GA–MC composites exhibited very high surface areas (728.3 m2 g−1), and ultra large pore sizes (48 nm) and pore volumes (0.96 cm3 g−1) due to the synergistic combination of the advantages of both macro-porous graphene aerogels and the meso-pores of mesoporous carbon. These wonderful features made GA–MC a promising enrichment material for SPME fiber coating. Under the optimum conditions, the home-made fiber (GA–MC) was successfully applied to extract BFRs in real wastewater samples and ideal results were obtained with recoveries of 74.6–96.2%. The new fibers demonstrated excellent enrichment capabilities compared to commercial polydimethylsiloxane (PDMS) and polyacrylate (PA) fibers for six brominated flame retardants (BFRs). The ideal extraction performance of the novel graphene aerogel–mesoporous composites creates new opportunities for SPME applied in environmental analysis.
Co-reporter:Xuemei Wang;Huan Wang;Muxin Lu;Xiaomin Ma;Pengfei Huang;Xiaoquan Lu;Xinzhen Du
Journal of Separation Science 2016 Volume 39( Issue 9) pp:1734-1741
Publication Date(Web):
DOI:10.1002/jssc.201600148
Three-dimensional graphene-supported mesoporous silica@Fe3O4 composites (mSiO2@Fe3O4-G) were prepared by modifying mesoporous SiO2-coated Fe3O4 onto hydrophobic graphene nanosheets through a simple adsorption co-condensation method. The obtained composites possess unique properties of large surface area (332.9 m2/g), pore volume (0.68 cm3/g), highly open pore structure with uniform pore size (31.1 nm), as well as good magnetic separation properties. The adsorbent (mSiO2@Fe3O4-G) was used for the magnetic solid-phase extraction of seven pesticides with benzene rings in different aqueous samples before high-performance liquid chromatography. The main parameters affecting the extraction such as adsorbent amount, volume of elution solvent, time of extraction and desorption, salt effect, oscillation rate were investigated. Under the optimal conditions, this method provided low limits of detection (S/N = 3, 0.525–3.30 μg/L) and good linearity (5.0–1000 μg/L, R2 > 0.9954). Method validation proved the feasibility of the developed adsorbent, which has a high extraction efficiency and excellent enhancement performance for pesticides in this study. The proposed method was successfully applied to real aqueous samples, and satisfactory recoveries ranging from 77.5 to 113.6% with relative standard deviations within 9.7% were obtained.
Co-reporter:Xuemei Wang, Muxin Lu, Huan Wang, Yifei Pei, Honghong Rao, Xinzhen Du
Separation and Purification Technology 2015 Volume 153() pp:7-13
Publication Date(Web):16 October 2015
DOI:10.1016/j.seppur.2015.08.030
•A 3D graphene aerogels–mesoporous silica materials were successfully fabricated.•The novel materials exhibited superior absorption capacity for four phenols even though at low or trace concentrations.•The low-cost and environmental friendly adsorbent with highly removal efficiency could be applied to the real wastewater.Three-dimensional (3D) graphene aerogels–mesoporous silica (GAs–MS) frameworks were successfully fabricated. The interconnected macropores were obtained from hydrothermally assembled 3D GAs, while the mesopores were generated by the silica uniformly grown on the surface of graphene. The resulting GAs–MS exhibited narrow mesopore size distribution (1.87 nm), high surface area (1000.80 m2 g−1), and hierarchical macro- and mesoporous structures. These wonderful features made GAs–MS as a promising adsorbent for the removal of hazardous phenols from wastewater. The adsorption study implied that the novel materials exhibited superior adsorption capacity of phenols to such as phenol, catechol, resorcinol and hydroquinone, with removal efficiencies of 68.6%, 86.6%, 91.1% and 94.7%, respectively.
Co-reporter:Xuemei Wang;Yifei Pei;Muxin Lu;Xiaoquan Lu;Xinzhen Du
Journal of Materials Science 2015 Volume 50( Issue 5) pp:2113-2121
Publication Date(Web):2015 March
DOI:10.1007/s10853-014-8773-3
Novel graphene oxide-ordered mesoporous silica materials with two-dimensional mesoporous structure and large surface area were successfully fabricated through sol–gel and self-assembly methods. The synthesized materials were characterized by small-angle X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption–desorption. By taking advantage of the excellent properties, the hybrid materials were employed as the adsorbent for removal of heavy metals in environmental waters by adsorption separation—inductively coupled plasma mass spectrometry. The results showed that the materials exhibited superior adsorption capacity, the removal efficiencies for As, Cd, Cr, Hg, and Pb reached 97.7, 96.9, 96.0, 98.5, and 78.7 %, respectively. The facile, low-cost, and environmental friendly synthesis method as well as highly efficient adsorption ability made it become a promising adsorbents for the removal of toxic heavy metals at low or trace concentrations from wastewater.
Co-reporter:Xuemei Wang;Muxin Lu;Yifei Pei;Xiaoquan Lu;Xinzhen Du
Journal of Porous Materials 2015 Volume 22( Issue 1) pp:83-90
Publication Date(Web):2015 February
DOI:10.1007/s10934-014-9875-7
Two novel mesoporous cellular foams (MCFs) materials with well-defined large and aerogel-like mesostructure were successfully synthesized using tetraethyl orthosilicate as silica source, cyclohexane (CHE) as a swelling agent and triblock copolymer Pluronic P123 and F68 as a template, respectively. The effect of CHE on the expansion of the framework were characterized in detailed by small-angle X-ray diffraction, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption–desorption. The results showed that CHE was an effective swelling agent on the pore size of MCFs. All as-prepared materials were employed as the adsorbent to brominated flame retardants (BFRs) from environmental water samples. The adsorption study indicated the new materials exhibited superior adsorption capacity, the removal efficiencies of MCF-1-1.5 for seven BFRs reached 81.4–95.2 % in industrial wastewater. The recoveries of method were in the range of 86.3–105.7 % for Xiaoqing River sample and 74.6–114.6 % for chemical plant wastewater sample.
Co-reporter:Xuemei Wang, Honghong Rao, Xiaoquan Lu, Xinzhen Du
Talanta 2013 Volume 105() pp:204-210
Publication Date(Web):15 February 2013
DOI:10.1016/j.talanta.2012.11.074
Octyl-functionalizd mesoporous SBA-15 was first used as precursor and selective stationary phase to prepare solid-phase microextraction (SPME) fiber by using the sol–gel technique. The new SPME coating possessed honeycomb-like porous structure and rough surface and showed excellent chemical stability and longer life span (over 200 cycles of usage). The performance of the octyl-SBA-15-coated fiber was tested through extraction of eight polycyclic aromatic hydrocarbons (PAHs). The results showed that the home-made SPME fiber exhibited higher extraction efficiency compared with the commercial SPME (30 μm and 100 μm PDMS) fibers. For PAHs analysis, the new fiber showed good precision (<4.8%), low detection limits (0.024–0.050 μg/L), and wide linearity (0.1–200 μg/L) under the optimized conditions. The repeatability of fiber-to-fiber and batch-to-batch was 3.2–8.4% and 4.4–9.5%, respectively. The method was applied to simultaneous analysis of eight PAHs with satisfactory recoveries in different spiking levels, which were 85.7–103.4% (10 μg/L) and 87.0–107.2% (50 μg/L) for water samples and 76.2–89.0% (10 μg/g) and 75.6%–91.2% (50 μg/g) for soil samples, respectively.Highlights► Octyl-functionalizd mesoporous SBA-15 was firstly used as SPME coating. ► The home-made SPME fiber was prepared by the sol–gel technology. ►New coating had excellent adsorption and separation ability to PAHs.
Co-reporter:Xue-Mei Wang;Xin-Zhen Du;Hong-Hong Rao ;Xiao-Quan Lu
Journal of Separation Science 2010 Volume 33( Issue 20) pp:3239-3244
Publication Date(Web):
DOI:10.1002/jssc.201000287
Abstract
A novel mesoporous-coated stainless steel wire microextraction coupled with the HPLC procedure for quantification of four polycyclic aromatic hydrocarbons in water has been developed, based on the sorption of target analytes on a selectively adsorptive fiber and subsequent desorption of analytes directly into HPLC. Phenyl-functionalized mesoporous materials (Ph-SBA-15) were synthesized and coated on the surfaces of a stainless steel wire. Due to the high porosity and large surface area of the Ph-SBA-15, high extraction efficiency is expected. The influence of various parameters on polycyclic aromatic hydrocarbons extraction efficiency were thoroughly studied and optimized (such as the extraction temperature, the extraction time, the desorption time, the stirring rate and the ionic strength of samples). The results showed that each compound for the analysis of real water samples was tested under optimal conditions with the linearity ranging from 1.02×10−3 to 200 μg/ L and the detection limits were found from 0.32 to 2.44 ng/ L, respectively. The RSD of the new method was smaller than 4.10%.
![Zinc, [5,10,15,20-tetraphenyl-21H,23H-porphinato(2-)-κN21,κN22,κN23,κN24]-, (SP-4-1)-](/data/chemimg/478800/14074-80-7.png)
![Zinc, [5,10,15,20-tetraphenyl-21H,23H-porphinato(2-)-κN21,κN22,κN23,κN24]-, (SP-4-1)-](/data/chemimg/478800/14074-80-7_b.png)
