ELECTROPHORESIS
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2018
·Vol. 39
·期 14
·1771-1776
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IF 2.569
Mei-E Yue,Qiaoyan Lin,Jie Xu,Ting-Fu Jiang
An ionic liquid-based headspace in-tube liquid-phase microextraction (IL-HS-ITLPME) in-line coupled with CE is proposed. The method is capable of quantifying trace amounts of phenols in environmental water samples. In the newly developed method, simply by placing a capillary injected with ionic liquids (IL) in the HS above the aqueous sample, volatile phenols were extracted into the IL acceptor phase in the capillary. After extraction, electrophoresis of the phenols in the capillary was carried out. Extraction parameters such as the extraction time, extraction temperature, ionic strength, volume of the sample solution, and IL types were systematically investigated. Under the optimized conditions, enrichment factors for four phenols were from 1510 to 1985. The proposed method provided a good linearity, low limits of detection (below 5.0 ng/mL), and good repeatability of the extractions (RSDs below 6.7%, n = 6). This method was then utilized to analyze two real environmental samples of Xiaoxi Lake and tap water, obtaining acceptable recoveries and precisions. Compared with the usual HS-ITLPME for CE, IL-HS-ITLPME-CE is a simple, low cost, fast, and environmentally friendly preconcentration technique.
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ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Chenlu Pu,Hongli Zhao,Yayun Hong,Qiliang Zhan,Minbo Lan
In this work, we presented a facile elution-free method for ultrasensitive enrichment of glycopeptides using two kinds of novel Ce-metal-organic frameworks (Ce-MOF) post-modified with hyaluronic acid (Ce-MOF@HA) and glutamic acid (Ce-MOF@Glu). Both of the synthesized materials remained stable in the loading buffer to enrich glycopeptides selectively and degrade in the eluent to release captured glycopeptides. Due to the dissolution of materials, the elution step of the enrichment process is omitted, resulting in an extremely high sensitivity (detection limit, 0.5 fmol/μL). Meanwhile, Ce-MOF@HA and Ce-MOF@Glu also possessed excellent selectivity with molar ratios of IgG and BSA digests being 1:1000 and 1:500, respectively. Noticeably, the practical applicability of the obtained materials was inspected by analyzing the glycopeptides enriched from human serum (2 μL) by nano-LC-MS, in which 434 N-glycopeptides from 182 N-glycoproteins (by Ce-MOF@HA) and 328 N-glycopeptides from 135 N-glycoproteins (by Ce-MOF@Glu) were detected, respectively. This work provides a new method to simplify the process of glycopeptides enrichment and also paves a novel way for the enrichment of trace targets from complex matrices.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Jiali Xue,Kuibao Zhang,Zongsheng He,Wenwen Zhao,Weiwei Li,Dayan Xie,Haibin Zhang
Simulated radioactive soil waste has been immobilized rapidly by self-propagating high-temperature synthesis (SHS) using CuO as the oxidant. CeO 2 was incorporated into the soil waste as the surrogate of radioactive actinide nuclides. The phase composition, microstructure, elemental distribution, density and chemical durability of obtained waste forms have been characterized. These results show that the radioactive soil waste forms were successfully prepared with zirconolite (2M-CaZrTi 2 O 7 ), soil (SiO 2 ) and Cu as the main phases. Simulated nuclide Ce was successfully immobilized in the solidified zirconolite-rich ceramic body. Moreover, the radioactive soil waste solidified body exhibits excellent chemical durability. The normalized leaching rates (42 d) of Si and Ca are in low values of 4.1 × 10 −3 and 2.5 × 10 −3 g m −2 d −1 , while that of Ce is kept as 10 −4 − 10 −6 g m −2 d −1 within 42 days. This result indicates a potential application of SHS for the safety disposal of radioactive contaminated soil waste.
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TALANTA
·
2017
·
IF 4.162
Pan Fang,Jian-Zhang Pan,Qun Fang
In this paper, we describe a robust sheath flow-based CE-MS interface with minimal interface dead volume based on an extended pattern. A 20 µm i.d. × 90 µm o.d. fused-silica capillary with a chemically-etched thin-wall tip (30 µm o.d.) was used as the separation capillary as well as electrospray emitter, and a 200 µm i.d. × 375 µm o.d. capillary with a tapered tip (40 µm o.d.) was used as the sheath flow capillary. An extendable sheath-flow interface mode was adopted by decreasing the thickness of separation capillary tip and extending the separation capillary tip out from the sheath flow capillary tip, and allowing the sheath flow to be transferred to the separation capillary tip along its outer surface, forming a surface sheath flow to mix with sample flow at the separation capillary tip. Such a strategy could significantly reduce the interface dead volume and thus improve the CE separation efficiency and detection sensitivity, as well as evidently enhance the working reliability of the CE-MS interface. We investigated various factors affecting the interface performance, including capillary extending distance, emitter diameters, sheath flow capillary shape , and sheath flow rate . Under the optimized conditions, a minimal interface dead volume of ca. 4 pL was obtained which is the smallest one compared with previously-reported sheath flow-based CE-MS interfaces. The feasibility and applicability of the present CE-MS interface were demonstrated in the separation of a peptide mixture with high separation efficiency of 2.07–3.38 µm plate heights and good repeatabilities (< 6.1% RSD, n = 5). We except such a simple and robust interface could provide a possible solution for the development of commercial CE-MS interfaces differing from the currently-used ones, and has the potentials to be applied in routine analytical laboratories for various studies such as proteomics, metabolomics, or single cell analysis.
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CATALYSIS COMMUNICATIONS
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2017
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IF 3.33
Baohuai Zhao,Rui Ran,Li Sun,Zesheng Yang,Xiaodong Wu,Duan Weng
A high-surface-area La-Ce-Mn mixed oxide was synthesized by citrate method, with further acid etching to dissolve the La 3 + ions in the lattice. The acid etching process efficiently improved the specific surface area, increased the ratios of Mn 4 + /Mn n + , Ce 3 + /Ce n + , O α /O tot , and enhanced the oxygen mobility of the catalyst, which were responsible for the superior catalytic performance. Compared to the pristine La 0.8 Ce 0.2 MnO 3 + δ catalyst, the etched one could convert CO and C 3 H 8 more efficiently, with 90% conversion of CO and C 3 H 8 at only 73 and 196 °C, respectively. Such superior catalytic performance made it possible to be used for automotive emission control during cold-start period.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zunchang Gao,Yanqing Wei,Xin Tian,Yang Liu,Xin Lan,Dawei Zhang,Shuaiyuan Han,Pengfei Huo
The synthesis of novel Ce/Fe bimetallic metal–organic frameworks (Ce/FcDA/FA-MOFs) via an innovative hydrothermal method is reported. This method utilizes Ce as the central metal and 1,1′-ferrocene dicarboxylic acid (FcDA) and formic acid (FA) as ligands. Optimization of hydrothermal time, feed ratio, and the addition of FA yielded Ce/FcDA/FA-MOFs with ideal ortho -dodecahedral hierarchical configurations. Comprehensive characterization via FT-IR, XRD, SEM, EDS, XPS, and N 2 adsorption/desorption analyses elucidated the influence of FA on morphology and chemical structure. Phosphate adsorption tests on Ce/FcDA/FA-MOFs revealed sustained strong selectivity and adsorption capacity, even in the presence of coexisting anions and variations in pH. Kinetic, thermodynamic, and isothermal simulations indicated spontaneous, efficient, and heat-absorbing phosphate adsorption properties on Ce/FcDA/FA-MOFs. Fitting parameters from the Langmuir adsorption model demonstrated a maximum adsorption capacity of up to 530.25 mg g −1 , attributed to physical/chemical adsorption during the reaction. Furthermore, investigation into the adsorption mechanism of Ce/FcDA/FA-MOFs on phosphate through FT-IR, XRD, and XPS analyses of the adsorbed samples revealed a complex process involving the electrostatic mutual attraction of outer-sphere entities and ligand exchange in the inner-sphere. This study advances our understanding of Ce/FcDA/FA-MOFs as effective adsorbents for phosphate and contributes to the development of environmentally sustainable materials with potential applications in water treatment.
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CHEMOSPHERE
·
2024
·
IF 8.1
Linxin Zheng,Ningchao Zheng,Zhizeng Pan,Guang Gao,Chao He,Xinran Mou,Xiangbiao Yin,Shunyan Ning,Mohammed F. Hamza,Yuezhou Wei
Efficient recovery of uranium from wastewater and seawater provides an important guarantee for the sustainable growth of nuclear energy. Herein, we skillfully use the alkali etching method to construct CeO 2 hollow spheres rich in Ce–OH groups for the removal and recovery of uranium from water matrixes. It is found that the CeO 2 exhibits fast adsorption kinetics (equilibrium time within 10 min) and moderate adsorption capacity (143.1 mg/g), and the removal efficiency of low concentration uranium (0.1 g/L and 1 g/L) reaches 100% within 1 min of adsorption. Moreover, the adsorption of uranium by CeO 2 is almost unaffected by common anions and cations in the environment, even if the concentration of anions is 1000 times that of uranium. More importantly, the CeO 2 can enrich uranium concentration in seawater by 167.9 times and the recovery rate reaches 83.9%. Mechanistic studies reveal that the adsorption of uranium by CeO 2 is mainly attributed to the rich Ce–OH groups on the surface of CeO 2 , resulting in the rapid adsorption of U(VI) and mainly forms a single-bridge model. The findings of this study provide a green and efficient path for the removal and recovery of uranium from wastewater and seawater.
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ELECTROPHORESIS
·
2013
·Vol. 34
·期 6
·846-853
·
IF 3.261
Haizhi Zhang,Li Qi,Ying Shen,Juan Qiao,Lanqun Mao
Amino acid ionic liquids (AAILs) with l -lysine ( l -Lys) as anion were synthesized and applied as new chiral ligands in Zn(II) complexes for chiral ligand-exchange CE. After effective optimization, baseline enantioseparation of seven pairs of dansylated amino acids was achieved with a buffer of 100.0 mM boric acid, 5.0 mM ammonium acetate, 3.0 mM ZnSO 4 , and 6.0 mM [C 6 mim][ l -Lys] at pH 8.2. To validate the unique behavior of AAILs, a comparative study between the performance of Zn(II)- l -Lys and Zn(II)-[C 6 mim][ l -Lys] systems was conducted. In Zn(II)-[C 6 mim][ l -Lys] system, it has been found that the improved chiral resolution could be obtained and the migration times of the three test samples were markedly prolonged. Then the separation mechanism was further discussed. The role of [C 6 mim][ l -Lys] indicated clearly that the synthesized AAILs could be used as chiral ligands and would have potential utilization in separation science in future.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 17
·
IF 1.64
Fang Ping Wang,Jun Ying Zhang,Hu Po Mu,Wan Xia Li,Ting Yuan,Xin Zhen Du
A pH-sensitive hydrogel [P(CE- co -DMAEMA- co -MEG)] was synthesized by the free-radical crosslinking polymerization of N,N -dimethylaminoethyl methacrylate (DMAEMA), poly(ethylene glycol) methyl ether methacrylate(MPEG-Mac) and methoxyl poly(ethylene glycol)-poly(caprolactone)-methacryloyl methchloride (PCE-Mac). The effects of pH and monomer content on swelling property, swelling and deswelling kinetics of the hydrogels were examined and hydrogel microstructures were investigated by SEM. Sodium salicylate was chosen as a model drug and the controlled-release properties of hydrogels were pilot studied. The results indicated that the swelling ratios of the gels in stimulated gastric fluids (SGF, pH = 1.4) were higher than those in stimulated intestinal fluids (SIF, pH = 7.4), and followed a non-Fickian and a Fickian diffusion mechanism, respectively. In vitro release studies showed that its release rate depends on different swelling of the network as a function of the environmental pH and DMAEMA content. SEM micrographs showed homogenous pore structure of the hydrogel with open pores at pH 1.4. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40737.
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ELECTROPHORESIS
·
2014
·
IF 3.161
Ying Feng,Tingting Wang,Zhengjin Jiang,Bezhan Chankvetadze,Jacques Crommen
A series of eight chiral β-blocker drugs, acebutolol, atenolol, carazolol, carteolol, carvedilol, propranolol, sotalol, and talinolol, have been enantioseparated using two single-component anionic β-CD derivatives, namely heptakis (2,3-di- O -methyl-6-sulfo)-β-CD (HDMS-β-CD) and heptakis (2,3-di- O -acetyl-6-sulfo)-β-CD (HDAS-β-CD), in aqueous CE and NACE. The influence of the nature of substituents (methyl or acetyl) in positions 2 and 3 on the CD derivatives and of the electrophoretic medium (water or methanol) on the enantioselectivity and enantiomer affinity pattern (EAP) of these structurally related compounds was systematically studied. All eight β-blockers could be enantioseparated at least partially in the four CE systems, except sotalol with HDMS-β-CD in NACE. In general, lower affinity and enantioselectivity were obtained in the presence of HDMS-β-CD compared to HDAS-β-CD. Reversals of EAPs were observed for all compounds. EAPs toward these two CDs were found to be opposite to each other in NACE for all compounds except carvedilol and in aqueous CE for atenolol, carteolol, talinolol, and sotalol. It is particularly noteworthy that opposite EAPs were also observed using the same CD derivative when the aqueous BGE was replaced with the methanolic one: for carazolol, carvedilol, and propranolol in the presence of HDMS-β-CD and for acebutolol and carvedilol with HDAS-β-CD.
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Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Yueyue He,Huaigang Cheng,Zihe Pan,Xiangping Zhang
Heterogeneous catalysts can avoid the problem of difficult separation and recovery of homogeneous catalysts in transesterification reactions, but there is a lack of basis for process optimization because the quantitative influence mechanism of supports is not clear. In this work, we firstly attempt to make a comprehensive comparation on the effect of potassium fluoride (KF) catalysts on various supports (carbonates and oxides of cerium, magnesium and calcium) on the transesterification reaction, especially on the kinetics. According to the results, oxide-supported catalysts are significantly more active than carbonate-supported catalysts because they have more active sites. When oxides were used as supports, KF/MgO exhibited good activity because of its stronger basicity and higher number of active sites on the surface. Under the same process conditions, the stability time of KF/CeO 2 , KF/CaO and KF/MgO catalysed transesterification reaction was 240 min, 90 min and 30 min, respectively. KF/MgO achieved a conversion of 68.0 %. The activation energies of the KF/CeO 2 , KF/CaO and KF/MgO catalysed transesterification reaction were 22.22 kJ/mol, 15.93 kJ/mol and 15.80 kJ/mol, respectively. The surface alkalinity of KF/MgO increased the frequency of molecular collisions of the reactants and exhibited a faster reaction rate.
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Journal of Energy Chemistry
·
2024
·
IF 14
Yongchao Yao,Shengjun Sun,Hui Zhang,Zixiao Li,Chaoxin Yang,Zhengwei Cai,Xun He,Kai Dong,Yonglan Luo,Yan Wang,Yuchun Ren,Qian Liu,Dongdong Zheng,Weihua Zhuang,Bo Tang,Xuping Sun,Wenchuang (Walter) Hu
Electrocatalytic hydrogen production from seawater holds enormous promise for clean energy generation. Nevertheless, the direct electrolysis of seawater encounters significant challenges due to poor anodic stability caused by detrimental chlorine chemistry. Herein, we present our recent discovery that the incorporation of Ce into NiFe layered double hydroxide nanosheet array on Ni foam (Ce-NiFe LDH/NF) emerges as a robust electrocatalyst for seawater oxidation. During the seawater oxidation process, CeO 2 is generated, effectively repelling Cl − and inhibiting the formation of ClO − , resulting in a notable enhancement in the oxidation activity and stability of alkaline seawater. The prepared Ce-NiFe LDH/NF requires only overpotential of 390 mV to achieve the current density of 1 A cm −2 , while maintaining long-term stability for 500 h, outperforming the performance of NiFe LDH/NF (430 mV, 150 h) by a significant margin. This study highlights the effectiveness of a Ce-doping strategy in augmenting the activity and stability of materials based on NiFe LDH in seawater electrolysis for oxygen evolution.
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