MICROCHEMICAL JOURNAL
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2019
·
IF 3.206
Liyang Du,Xuedong Wang,Tingting Liu,Jieyi Li,Junxia Wang,Ming Gao,Huili Wang
Herein, we developed a novel three-layer nanocomposite for adsorption/extraction of organophosphorus pesticides in fruit juice samples. This magnetic nanocomposite was fabricated by coating polydopamine and Mg/Al layered double hydroxides onto NiFe 2 O 4 nanoparticles , which overcomes the shortcomings of low surface area and easy agglomeration associated with conventional Fe-based crystal nanoparticles. Additionally, the higher dispersibility of polydopamine and larger specific surface area of Mg/Al layered double hydroxides are conducive to rapid dispersion and efficient adsorption of organophosphorus pesticides by the synthesized nanocomposites, thereby greatly improving the efficiency of magnetic solid-phase extraction. The extraction method based on as-synthesized nanocomposites provided average extraction recoveries of 84.9% for methamidophos , parathion and phoxim , an increase of ca. 30% and 19% over those of NiFe 2 O 4 and NiFe 2 O 4 @polydopamine, respectively. The main operational parameters were firstly screened and then optimized using Plackett-Burman and central-composite design, respectively. Under optimized conditions, this proposed method yielded low detection limits (0.06–0.13 μg L − 1 ) and high intra- and inter-day precisions (2.7–4.5%). Average extraction recoveries for organophosphorus pesticides were 81.8–94.4% in grape, apple, orange, peach and mango fruit juices. To sum up, it integrates highly efficient preconcentration/extraction/dispersion, as well as rapid separation/collection into one synchronous step, satisfies the technical requirement of modern analytical pretreatment and thus enriches the multi-functional application of Fe-based nanoparticles.
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Nanomaterials
·
2018
·Vol. 8
·期 2
·113
·
IF 3.504
Lijun Wang,Yusen Wang,Xiaoxia Wang,Xiaolan Feng,Xiao Ye,Jie Fu
Layered double hydroxides (LDHs) have been widely used as an important subset of solid base catalysts. However, developing low-cost, small-sized LDH nanoparticles with enhanced surface catalytic sites remains a challenge. In this work, silica aerogel (SA)-supported, small-sized Mg–Al LDH nanosheets were successfully prepared by one-pot coprecipitation of Mg and Al ions in an alkaline suspension of crushed silica aerogel. The supported LDH nanosheets were uniformly dispersed in the SA substrate with the smallest average radial diameter of 19.2 nm and the thinnest average thickness of 3.2 nm, both dimensions being significantly less than those of the vast majority of LDH nanoparticles reported. The SA/LDH composites also showed large pore volume (up to 1.3 cm3·g) and pore diameter (>9 nm), and therefore allow efficient access of reactants to the edge catalytic sites of LDH nanosheets. In a base-catalyzed Henry reaction of benzaldehyde with nitromethane, the SA/LDH catalysts showed high reactant conversions and favorable stability in 6 successive cycles of reactions. The low cost of the SA carrier and LDH precursors, easy preparation method, and excellent catalytic properties make these SA/LDH composites a competitive example of solid-base catalysts.Keywords:layered double hydroxides;nanocatalysts;mesoporous silica;support;solid base
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Ziqiang Ai,Changqing Liu,Qiwu Zhang,Jun Qu,Zhao Li,Xiaoman He
In this study, a mechanochemical route to promote the adsorption of the precursor of Zn-Al layered double hydroxide (LDH) was introduced, in which ZnO and SiO 2 were added to Zn basic carbonate and Al hydroxide that were first dry milled into an activated state as a precursor for a LDH phase. The samples prepared in this way were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Scanning electron microscopy (SEM). The precursors showed a high adsorption rate when added with the oxides. 10% addition of ZnO gave a maximum MO removal efficiency of 96.91% (193.82 mg/g at initial MO concentration of 160 mg/L), 16.46% higher than the sample without addition. Addition of SiO 2 at 25% allowed MO removal efficiency reaching 88.90% (222.25 mg/g, at initial MO concentration of 200 mg/L), 19.26% higher than the no additive sample. The improvement in the adsorption performance could be attributed to the effective dispersion of the precursor's agglomeration phenomenon. Discussion was performed based on the characterized features of the samples and fitting results on several adsorption models.
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JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Kening Sun,Jia Liu,Jie Feng,Hong Yuan,Minjie He,Chunming Xu,Zhenhua Wang,Wang Sun,Jinshuo Qiao
B-site substituted Sr 2 Fe 1.4 X 0.1 Mo 0.5 O 6-δ (SFXM, X = Bi, Al and Mg) are evaluated as anode materials for hybrid direct carbon fuel cells (HDCFCs). The structure, morphology, conductivity and catalytic activity of the as-prepared SFXM anode are systematically investigated. Under a reducing atmosphere, the exsolution of metallic Fe from the SFXM perovskite lattice are demonstrated by the XRD , SEM and TEM observations. Further element valence analysis on reduced SFXM suggests the X doping significantly alters the Fe 3+ /Fe 2+ and Mo 6+ /Mo 5+ ratio, and thus beneficial to the intrinsic conductivity of SFXM. All these advantages are responsible for the good electrochemical performances of SFXM anodes. Meanwhile, among these SFXM anodes, the conductivity, catalytic activity and electrochemical performance all obey the order of SFBM > SFAM > SFMM. The maximum power densities of the La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3 electrolyte supported single cell with SFBM as the anode reaches 399, 287 and 141 mW cm −2 at 800 °C, 750 °C and 700 °C, respectively. Such designed B-site substitution perovskites have great potential to be applied as HDCFC anode materials.
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RSC Advances
·
2015
·Vol. 5
·期 55
·43906-43916
·
IF 3.84
Zakir Hussain,Li Daosheng,Li Xi,Kang Jianxiong
A study has been designed for a fluoride adsorbent synthesized by a co-precipitation approach of Mg(II), Al(III) and La(III) salts (MAL) in 2 : 1 : 2 ratios. The prepared material illustrated relatively stable fluoride adsorption potential and an amorphous structure at temperatures lower than 600 °C. The defluoridation capacity of a 2 g L−1 adsorbent dose at room temperature was observed to be between 24.08 to 98.28% for a 10 and 20.66 mg L−1 fluoride solution in a broad pH range (2 to 12), while for a 45.45 mg L−1 solution, it varied between 26.49 to 80.42%. The adsorption process on MAL was endothermic in nature (−ΔG), follows pseudo second order kinetics (R2 = 0.999) and best fitted with a Langmuir sorption isotherm model (R2 = 0.9985). The prepared material was characterized by XRD, SEM, BET, EDX, FTIR and XPS, whereas contact times, sorption kinetics, dosage and the effect of major co-existing anions were carried out for the optimization of the adsorbent. In addition to amphoteric behavior of Al(III) in the composite material, the effect of fluoride concentration and sorbent quantity in a batch process appeared to be important factors in maintaining the near neutral pH of the treated water. Similarly, one other factor, flow rate was found to affect the pH in the column adsorption process. Regeneration of up to 95.71% of the fluoride loaded adsorbent was achieved with a methanol and HCl mixture. The results showed that Al(III) acted as amphoteric reagent and keeps the pH within drinking water range or near neutral.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Jian Jian,Kuiyi You,Qing Luo,Hongxu Gao,Fangfang Zhao,Pingle Liu,Qiuhong Ai,He’an Luo
Developing an economic and efficient approach for the production of adipic acid is a grand challenge in the chemical industry. Toward this goal, we report a simple method for selective synthesis of adipic acid from cyclohexane with NO2 by using Ni–Al–VPO/MCM-41 as catalyst. The physical-chemical properties of supported Ni–Al–VPO/MCM-4 catalysts were characterized, the reaction conditions were optimized, and the reusability of the catalyst was examined. The results showed that the supported 30%Ni–Al–VPO/MCM-41 catalyst exhibited excellent catalytic performance with 65.1% of cyclohexane conversion and 85.3% of selectivity toward adipic acid, especially, its catalytic performance was still stable after five runs. Maybe this developed method has potential industrial application prospects for production of adipic acid.
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MATERIALS & DESIGN
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2016
·
IF 3.997
Yuhua Zhu,Xueming Li,Daixiong Zhang,Hebin Bao,Yuanjie Shu,Xiaogang Guo,Yanjun Yin
Al/MoO 3 nanoenergetic films (nEFs) were successfully prepared by the electrophoretic deposition (EPD) method. Polyethylenimine (PEI) was used to modify the surface charge of Al and MoO 3 particles for the first time. In particular, the zeta potentials of Al/MoO 3 were varied from negative value to highly positive one, which could contribute to the co-deposition of Al and MoO 3 particles on the cathode. In addition, an effective adsorption of PEI on the particles was demonstrated by the FT-IR result. The kinetics of EPD process were investigated in this paper that the linear relationship of the equivalence ratio in the deposited film (Φ d ) to that in suspension (Φ s) was observed for Al/MoO 3 nEFs. Furthermore, The FESEM , EDS and XRD analysis showed that Al/MoO 3 nEFs were homogeneous mixed and composed of Al and MoO 3 . The DSC and combustion processes results indicated that the exothermic behaviors were affected by the molar ratio of the fuel (Al) to the oxidizer (MoO 3 ) in Al/MoO 3 nEFs, and reached to the maximum of 3419 J/g and the most violent combustion as the Φ s was 1.6, respectively. Al/MoO 3 nEFs with excellent performance could lead to advances in the microelectro mechanical system technologies.
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JOURNAL OF POWER SOURCES
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2017
·
IF 6.395
Wei-Lin Pang,Xiao-Hua Zhang,Jin-Zhi Guo,Jin-Yue Li,Xin Yan,Bao-Hua Hou,Hong-Yu Guan,Xing-Long Wu
Recently, sodium-ion batteries (SIBs) have been considered as the promising alternative for lithium-ion batteries. Although layered P2-type transition metal oxides are an important class of cathode materials for SIBs, there are still some hurdles for the practical applications, including low specific capacity as well as poor cycling and rate properties. In this study, the electrochemical properties of layered Mn-based oxides have been effectively improved via Al doping, which cannot only promote the formation of layered P2-type structure in the preparation processes but also stabilize the lattice during the successive Na-intercalation/deintercalation due to suppression of the Jahn-Teller distortion of Mn 3+ . Among the as-prepared series of Na 2/3 Mn 1- x Al x O 2 ( x = 0, 1/18, 1/9, and 2/9), Na 2/3 Mn 8/9 Al 1/9 O 2 with x = 1/9 exhibits the optimal doping effect with the best electrochemical properties, in terms of the highest specific capacity of 162.3 mA h g −1 at 0.1 C, the highest rate capability, and the best cycling stability in comparison to the undoped Na 2/3 MnO 2 and the other two materials with different Al-doped contents. Both cyclic voltammetry at varied scan rates and galvanostatic intermittent titration technique disclose the optimal electrode kinetics (the highest Na-diffusion coefficient) of the best Na 2/3 Mn 8/9 Al 1/9 O 2 .
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2013
·
IF 3.365
Sen Lin,Lei Shi,Hongpeng Zhang,Na Zhang,Xianfeng Yi,Anmin Zheng,Xuebing Li
Al-SBA-15 containing plug structures inside straight channels have been hydrothermally synthesized through a one-step synthesis strategy in an environmentally friendly acid-free medium. The effects of steaming, alkali, and acid post-treatments on the structural properties were investigated by powder X-ray diffraction (XRD), nitrogen adsorption–desorption at 77 K, transmission electron microscopy (TEM), scanning electron microscopy (SEM), FT-IR spectrum, 27 Al MAS NMR, and inductively coupled plasma (ICP) analyses. The presence of the plugs can significantly enhance structural stability against steaming or alkali post-treatments. Acid post-treatment can be a very simple and convenient technique for adjusting the textural properties of plug-containing Al-SBA-15, and especially for optimizing the accessibility to active sites. Acid post-treatment at the low temperatures of 313 and 323 K results in the formation of a larger specific surface area (905 m 2 /g) and pore volume (0.94 cm 3 /g) through an “open door” effect in the plugs, without eliminating any of the plugs from the channels. In particular, nearly half of the secondary micropores on the pore walls were preserved. In contrast, raising the acid post-treatment temperature further to 333 and 343 K caused a “closed doors” effect through the blockage of pores in the plugs by the extracted fragments. After loading with nickel, the catalyst exhibited a higher yield of C 10+ olefins in ethylene oligomerization , and more importantly, after steaming and acid post-treatments at higher temperatures, the samples showed shape selectivity for the C 16 olefin.
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NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 40
·期 2
·1878-1881
·
IF 3.086
Yong Cui,Zhe Zhang,Xu Du,Wei Liu,Yulin Deng,Shi Liu,Gang Wang
CuIn0.9R0.1(S,Se)2 (R = Al, Ni, Co) thin films were obtained via a solution process based on homogeneous precursor solutions and selenization. The as-prepared thin films were characterized by XRD, EDS and SEM. The CdS buffer layer was deposited by a solution process on the CuIn0.9R0.1(S,Se)2 (R = Al, Ni, Co) thin films, and Mo/CuIn0.9R0.1(S,Se)2 (R = Al, Ni, Co)/CdS/i-ZnO/ITO/Al thin-film solar cells were fabricated. The efficiencies of the as-fabricated CuIn0.9R0.1(S,Se)2 (R = Al, Ni, Co) thin-film solar cells were 4.33%, 2.38% and 1.98%, respectively.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yeming Huang,Jingxuan Zhang,Renhong Wang,Bing Gao,Ruyi Miao,Sirun Zhang,Dunju Wang
Improving the energy release efficiency of aluminium powders in weaponry is essential. In this study, uniform core-shell Al@(PFDTES/GAP) was prepared by hydrolyzing PFDTES and co-reacting it with GAP on aluminum powder. It showed better thermal reaction, combustion and energy release. The thermal properties of Al@(PFDTES/GAP) exhibit a significant aluminum-fluorine exothermic phenomenon in DSC, with a 4.9 % increase in exothermic heat in the combustion test compared to raw-Al. For the samples blended with PTFE, Al@(PFDTES/GAP)/PTFE demonstrated excellent performance in terms of increased heat release (increased by 28.0 %) in DSC, higher heat release (increased by 10.2 %) in the heat of combustion test, larger combustion flame area and faster combustion speed (the time reduced by 20.0 %) in the air, compared with that of raw-Al/PTFE. In conclusion, this method is simple and effective to enhance the energy release of aluminium powder, which is of great significance for improving the energy of weapons and equipment.
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TALANTA
·
2024
·
IF 5.6
Shanshan Zhou,Jialin Li,Jun Zeng,Yuewen Huang,Bin Wang
This study developed a novel organic-inorganic hybrid composite, shortly as GO-PEG-LDHs, by self-assembly of exfoliated Mg–Al layer double hydroxide (LDHs) on the polyethylene glycol (PEG) grafted graphene oxide (GO) to achieve the selective adsorption of hemoglobin (Hb). The prepared GO-PEG-LDHs has a hierarchical structure with a homogeneous loading of exfoliated LDHs nano-sheets on its surface. The adsorption test reveals that GO-PEG-LDHs exhibits an adsorption efficiency of 95.03% for Hb and 3.45% for bovine serum albumin (BSA). The adsorption of Hb follows the Langmuir model, with an ultrahigh adsorption capacity of 55248.6 mg/g, which is higher than any previously reported materials. Meanwhile, the adsorbed Hb can be efficiently recovered through elution with a 50 mM Tris-HCl buffer, with an elution efficiency of 80.77%. Circular dichroism (CD) spectra indicate no conformational change for Hb during the process of adsorption/desorption. Furthermore, the composite demonstrates the ability to selectively isolate Hb in the presence of interfering protein BSA, indicating its potential for practical applications.
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高影响因子
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