Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Ao Sun,Yingqing Zhan,Wei Yang,Qingying Feng,Hongyu Dong,Ximin Chen,Yiwen Chen
The super-wetting polymer-based membrane has displayed promising application in the oily wastewater purification because of its unique anti-fouling feature. However, the creep of micro-/nano- structure on surface of membrane and wettability attenuation under harsh conditions would lead to the decrease of separation flux and efficiency, which posed a huge challenge to the membrane technology . In this study, we prepared the super-hydrophilic and underwater super-oleophobic polymer composite membrane through the one-step biomimetic deposition of sodium alginate , dopamine, and SiO 2 nanoparticles onto the surface of poly (aryl ether nitrile) (PEN) membrane with wavy rough structure. Typically, the effect of physical confinement, dopamine with strong adhesion, and the co-deposition of polydopamine and sodium alginate coatings endowed the composite membrane with durable super-wetting property (water contact angle: 0° and underwater oil contact angle: 153°) and oil repellent behavior. Hence, when separating different surfactant-stabilized oil-in-water emulsions, as-prepared PEN composite membrane showed high separation flux of 762.81 ± 28.37 L·m −2 ·h −1 (847.5 ± 31.52 L·m −2 ·h −1 ·bar −1 ) and rejection ratio of 99.51 ± 0.16 %. Furthermore, the efficient separation performance and super-wetting feature of composite membrane could be retained even treating in the conditions of 4 M HCl/80 ℃ and 1 M NaOH/80 ℃, which exhibited potential application for purification of oily wastewater containing different oil/water emulsions under harsh environments.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Chenjie Wei,Rongrong Qiang,Ligang Lin,Yixin Gao,Shuyan Ma,Xihang Zhang,Xiaojun Huang
Desalination of brackish water and purification of drinking water still pose several challenges. Combination of in-situ hydrolysis and condensation of tetraethyl orthosilicate (TEOS) in polyamic acid (PAA) solution along with imidization reaction provide a novel polyimide/SiO 2 (PI/SiO 2 ) membrane. This is the first synthesis of a PI nanofiltration (NF) membrane with three-dimensional (3D) water channels, ultra-thin skin layer (30 ± 2 nm), and high flux at low operating pressure, by one-step phase inversion method. There was no additional requirement of an acid, since PAA served as a catalyst. The SiO 2 cross-linked network provided the skeletal support, due to hydrogen bonding between PAA-PI and silicon hydroxyl groups. The fabricated PI/SiO 2 membrane demonstrated a water contact angle of 45°, pore size of 1.05 ± 0.15 nm, Zeta potential of −30 mV, and tensile strength of 2.24 MPa when under optimized conditions. The loose PI/SiO 2 NF membrane exhibited salt rejection in the sequence of Na 2 SO 4 (87%)>MgSO 4 (67%)>NaCl (41%)>MgCl 2 (37%), which was consistent with size exclusion and Donnan exclusion effects. In particular, the water flux of 20.4 L/(m 2 h bar) was about 4–15 times higher than that of universal PI-NF membranes. The membrane also exhibited excellent stability for over six days when used for separation. Furthermore, the membrane showed excellent dye (Rose Bengal (RB), Brilliant Blue G (BBG), Amido Black (AB)) rejection of over 90%. To conclude, this work paves a new pathway for the fabrication of PI-NF membranes for efficient NF separation.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sibo Zhao,Hengbin Mao,Weishan Ma,Mingliang Li,Shao Gang,Bingbing Fan,Hailong Wang,Hongliang Xu,Hongxia Lu
All-inorganic halide perovskite nanocrystals (NCs) have attracted much attention in many fields. However, the poor stability of NCs and the toxicity of Pb have greatly hindered their practical applications. Reducing the proportion of Pb with the concept of high-entropy and coating NCs with an outer layer have been regarded as effective strategies to solve the problems. Herein, We have successfully synthesized the all-inorganic high-entropy dual-phase Cs(Pb 1/5 Mn 1/5 Ni 1/5 Zn 1/5 Cd 1/5 )Br 3 /Cs(Pb 1/5 Mn 1/5 Ni 1/5 Zn 1/5 Cd 1/5 ) 2 Br 5 (Cs‘B’Br 3 /Cs‘B’ 2 Br 5 ) perovskite NCs with good luminescence properties by a high-energy ball milling method; On the basis of which, Cs‘B’Br 3 /Cs‘B 2 ’Br 5 NCs are coated with SiO 2 and EVA resin. Due to the amorphous SiO 2 protection, the Cs‘B’Br 3 /Cs‘B 2 ’Br 5 @SiO 2 NCs maintained 93% of their emission intensity after 90 days compared to their uncoated counterparts. The PL intensity of Cs‘B’Br 3 /Cs‘B 2 ’Br 5 NCs /EVA was significantly enhanced by a factor of 4.7 for compared to the uncoated NCs. In addition, the PL emission intensity of the Cs‘B’Br 3 /Cs‘B 2 ’Br 5 NCs /EVA remained 93.7% after 90 days, and the emission peak intensity remained approximately 63% after 8 h of placement in an enclosed environment at 80% humidity through the dense polymer chains and the hydrophobic nature of the film. Finally, the film could expand its application prospects in the field of flexible device.
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JOURNAL OF CATALYSIS
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2019
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IF 7.723
Yuli Wei,Zhiwang Yang,Guohu Zhao,Wu Yang
Carbon nanotube sieves (CNTs-S) with a flutelike shape were synthesized by cutting and perforating using a chemical oxidation etching method. Using the obtained CNTs-S as a hard template, SiO 2 -coated CNTs-S dual pore structures (CNTs-S@SiO 2 ) were formed. Finally, tungstophosphoric acid was supported on CNTs, CNTs-S, and CNTs-S@SiO 2 matrices by the incipient wetness method to obtain the corresponding supported catalysts PW 12 /CNTs, PW 12 /CNTs-S, and PW 12 /CNTs-S@SiO 2 . The results showed that obtained 30%PW 12 /CNTs-S and 30%PW 12 /CNTs-S@SiO 2 catalysts in 30 wt% dipping solution had the best catalytic performance for Baeyer–Villiger oxidation of cyclic ketones by H 2 O 2 . The conversion of cyclohexanone was 94% and 91%, respectively, in 5 min under microwave irradiation. Cyclopentanone and adamantanone approached quantitative conversion and the selectivity of corresponding lactones reached 100%. The dual pore structure catalyst showed very excellent cyclic stability.
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MOLECULES
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2018
·Vol. 23
·期 7
·1554
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IF 3.098
Mijun Peng,Huan Li,Ruiqing Long,Shuyun Shi,Hanjun Zhou,Shuping Yang
Magnetic porous molecularly imprinted polymers (MPMIPs) for rapid and efficient selective recognition of chlorogenic acid (CGA) were effectively prepared based on surface precipitation polymerization using CGA as template, 4-vinylpyridine (4-VP) as functional monomer, and mesoporous SiO2(mSiO2) layer as sacrificial support. A computational simulation by evaluation of electronic binding energy is used to optimize the stoichiometric ratio between CGA and 4-VP (1:5), which reduced the duration of laboratory trials. The porous MIP shell and the rid of solid MIPs by magnet gave MPMIPs high binding capacity (42.22 mg/g) and fast kinetic binding (35 min). Adsorption behavior between CGA and MPMIPs followed Langmuir equation and pseudo-first-order reaction kinetics. Furthermore, the obtained MPMIPs as solid phase adsorbents coupled with high performance liquid chromatography (HPLC) were employed for selective extraction and determination of CGA (2.93 ± 0.11 mg/g) in Duzhong brick tea. The recoveries from 91.8% to 104.2%, and the limit of detection (LOD) at 0.8 μg/mL were obtained. The linear range (2.0–150.0 μg/mL) was wide withR2> 0.999. Overall, this study provided an efficient approach for fabrication of well-constructed MPMIPs for fast and selective recognition and determination of CGA from complex samples.Keywords:surface precipitation polymerization;mesoporous SiO2;selective extraction;chlorogenic acid;Duzhong brick tea
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PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2014
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IF 3.107
Qing Shen,Hon-Yeung Cheung
A solid-phase extraction (SPE) procedure, using titania-coated silica (TiO2/SiO2) core–shell composites as the sorbent, combined with a liquid chromatography–tandem mass spectrometry (LC–MS/MS) method was developed for extraction, visualization, and quantification of phospholipids in shrimp waste (Litopenaeus vannamei). The SPE protocol was optimized, and the best conditions were pH 5 of the loading solvent, 10% aqueous methanol as the washing solvent, and 1.0 mL of chloroform/methanol (1:2, v/v) as eluting solvents. Afterward, the eluate was separated on a diol hydrophilic interaction chromatography (HILIC) column. A total of 69 phospholipid species were identified and determined. The results indicated that, in comparison to previously published methods, this strategy was cost-effective and efficient in extraction, characterization, and determination of phospholipids. Meanwhile, phospholipids were abundant in shrimp waste, most of which contained unsaturated fatty acyl chains, such as 18:3 [α-linolenic acid (ALA)], 20:5 [eicosapentaenoic acid (EPA)], and 22:6 [docosahexaenoic acid (DHA)]. The successful application of this strategy paves the way for full use of traditionally discarded shrimp wastes.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 61
·56353-56364
·
IF 3.289
Meng Shen,Guozheng Liang,Aijuan Gu,Li Yuan
Outstanding antibacterial activity, low polymerization shrinkage and high mechanical properties are key requirements for dental resin composites (DRCs), however, they are difficult to be simultaneously obtained, and becomes the bottleneck for developing DRCs. Herein, a new kind of functional zinc oxide whisker (ZnOw) with CC bonds, coded as SK-ZnOw, was synthesized by grafting SiO2 on the surface of ZnOw using the Stöber method. Then SK-ZnOw was embeded into commercial dental resin (dimethacrylate resin, UBT) to fabricate a novel kind of DRCs (SK-ZnOw/UBT). The structure and comprehensive performances including degrees of conversion, polymerization shrinkages, antibacterial activity and mechanical properties of SK-ZnOw/UBT composites were systematically investigated. The results show that SK-ZnOw/UBT composites have simultaneously excellent and durable antibacterial activity, higher mechanical properties and lower polymerization shrinkages than both UBT resin and ZnOw/UBT composites. Especially, for the SK-ZnOw/UBT composite containing 20 wt% SK-ZnOw, its antibacterial rate and that of sample after storage in distilled water at 37 °C for 20 days are as high as 98.1% and 93.7%, respectively; moreover, its flexural strength, flexural modulus and Vickers hardness are about 1.3, 1.1 and 1.4 times those of corresponding values of ZnOw/UBT composite with 20 wt% ZnOw. Meanwhile the polymerization shrinkage of the former is only 0.8 times of that of the latter, clearly demonstrating that the bottleneck of traditional DRCs in literature has been solved. The outstanding performances of SK-ZnOw/UBT composites suggest that the method provided herein is facile and effective to develop novel functional fillers and high performance DRCs.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yingjie Ma,Baolei Liu,Dewen Sun,Dongfang Wang,Yabin Ma,Qianping Ran
SiO2/Fe3O4 hybrid wall microcapsules containing a paraffin core were successfully fabricated by Pickering emulsion template self-assembly and sol–gel technologies. The walls of these microcapsules were embedded with different dosages of Fe3O4 nanoparticles due to the effect of Fe3O4 Pickering emulsion of different concentrations. The resultant microcapsules exhibited a regular spherical morphology and a rough outer surface compared with that of the SiO2 wall. Thermal analysis indicated that the encapsulation efficiency (Een), thermal energy-storage efficiency (Ees), and thermal conductivity of paraffin@SiO2/Fe3O4 hybrid wall microcapsules prepared with 0.01 mol/L Fe3O4 Pickering emulsion [Pa@SiO2/Fe3O4-Ms (0.01)] increased by 16.71%, 16.88%, and 28.4% compared with those of paraffin@SiO2 microcapsules (Pa@SiO2-Ms), respectively. The phase-change temperatures and enthalpy of Pa@SiO2/Fe3O4-Ms (0.01) with an 80–100 μm particle size range changed little after 300 thermal cycles. At the same time, these microcapsules were introduced into water-based acrylic resin paint to prepare phase-change composite protective coatings (PCCPCs) and exhibited excellent thermoregulatory performance. The real-time temperature difference and temperature ramp rate of PCCPCs incorporating 5 wt % (80–100 μm) Pa@SiO2/Fe3O4-Ms (0.01) increased by 4.6 °C and decreased by 2.45 °C/min compared to that of the pure coating, respectively. Meanwhile, the fluctuation amplitude and fluctuation frequency of the average temperature on the back side of 5 wt % (80–100 μm) Pa@SiO2/Fe3O4-Ms (0.01)-PCCPCs decreased by 3.8 °C and extended by 395 s compared to that of the pure coating under one heating and cooling cycle, respectively. This study will provide great potential applications for addressing the risk of shrinkage deformation and cracking of the protected concrete substrates under high-frequency and large temperature difference conditions.
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高影响因子
Analytical Methods
·
2025
·
IF 2.6
Zheng Chang,Zhenyuan Duan,Junpeng Li,Xiangze Meng
In this study, hemin-functionalized polyethyleneimine/silica nanoparticles (hemin/PEI/SiO2 NPs) served as an electrochemical label for ultrasensitive detection of prostate-specific antigen (PSA), a clinically important prostate cancer biomarker. A poly(thionine)/carbon nanotube (PTh/CNTs) multilayer film was fabricated on a glassy carbon electrode (GCE) via integrated electropolymerization and electrostatic layer-by-layer (LbL) assembly, forming a {PTh/CNTs}2/PTh modified GCE with abundant amino groups. PSA capture antibodies (Ab1) were then covalently immobilized on the modified electrode through glutaraldehyde (GA) crosslinking, leveraging the film's surface-exposed amino groups. Furthermore, hemin/PEI/SiO2 NPs were synthesized through amine-carboxyl interactions between carboxyl groups of hemin and amine groups of PEI/SiO2 NPs. The immunosensor assembly employed a sandwich-type electrochemical platform using PSA detection antibody (Ab2)-conjugated hemin/PEI/SiO2 NPs. The specific antibody-antigen binding enables efficient electron transfer across the nanoscale spacing (several nanometers) between hemin/PEI/SiO2 NPs and the {PTh/CNTs}2/PTh multilayer film. In this architecture, CNTs serve as excellent electron mediators, significantly facilitating electron transport. Moreover, the high-density immobilization of hemin on PEI/SiO2 NPs significantly amplifies the electrochemical redox currents of the multilayer film through proximity effects. This enhanced electrical signal enables highly sensitive detection of target protein antigen–antibody binding events. Consequently, by correlating the enhanced reduction peak current of the immunosensor with PSA concentration, highly sensitive detection of PSA at various concentrations can be achieved. Under optimized conditions, it exhibited a linear response to logarithmic PSA concentrations (0.01 pg mL−1 to 100 pg mL−1, R = 0.9963), with an ultralow detection limit of 3.0 fg mL−1 (S/N = 3). Furthermore, the immunosensor demonstrated outstanding analytical performance in human serum samples (96.0–103% recovery, n = 3), confirming its high accuracy for clinical applications.
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JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Yunxuan Chen,Jun Nan
Membrane fouling has always been a problem hindering the practicability of ultrafiltration . Direct regulation of the structure of the cake layer formed by rapid deposition of flocs as a “secondary barrier” in the in-line coagulation ultrafiltration (C-UF) process has acquired importance as a research topic in comparison to membrane modification and standard coagulation ultrafiltration. In this study, membrane fouling was controlled in the C-UF process via coagulation/nano-scale Fe 3 O 4 load (C/FL-UF) and coagulation/nano-scale Fe 3 O 4 @SiO 2 load (C/FSL-UF). The promotion effects of these two processes (C/FL-UF and C/FSL-UF) on the reduction of membrane fouling and improvement of water quality were systematically studied employing simulated surface water. Floc characteristics, XDLVO theory, and the Hermia model, etc were employed to explain the optimization of cake layer. For coagulation/Fe 3 O 4 load, the floc size was large and loose, whereas, for coagulation/Fe 3 O 4 @SiO 2 load with high recoverability., the floc size was slightly loose. The newly constructed cake layer had improved porosity, structural stability and capacity of water transport. Meanwhile, decrease of unit adhesion free energy and secondary minimum depth along with the substantial increase of energy barrier between the reconstructed cake layers and membranes or colloids explained the mechanism of reduced membrane fouling from the surface energetics. The gradual decrease of water contact angle and the optical images proved that the affinity of the cake layer was significantly reduced. Hermia model further validated the accuracy of this study in controlling membrane fouling by regulating the formation of the cake layer. Finally, the study concluded by analyzing the practicability and efficacy of the procedure to further elucidate the applicability of this research.
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Energy & Environmental Science
·
2012
·Vol. 5
·期 3
·6104-6110
·
IF 9.61
Yanfeng Gao,Shaobo Wang,Hongjie Luo,Lei Dai,Chuanxiang Cao,Yiliao Liu,Zhang Chen,Minoru Kanehira
Vanadium dioxide is a key material for thermochromic smart windows that can respond to environmental temperature and modulate near infrared irradiation by changing from a transparent state at low temperature to a more reflective state at high temperature, while maintaining visible transmittance. VO2 thermochromism is commonly used in films on glass that function as smart windows. Flexible VO2 nanocomposite foils are able to combine the intrinsic properties of VO2 nanoparticles with the added functionalities contributed by nanoscale and interface effects, such as increased visible transparency and infrared modulation ability. These foils are promising for applications in construction and automotive glasses to increase energy efficiency. However, VO2 nanoparticles may be unstable, and they are difficult to prepare in stable dispersive suspensions. In this paper, we report a novel all-solution process that can be used to prepare transparent, stable and flexible VO2-based composite films. These films exhibit UV-shielding properties and an excellent temperature-responsive thermochromism in the near infrared region. A typical film has a solar modulation efficiency of 13.6%, which is the highest value for VO2 thermochromic films with comparable visible transmittance. Coating the VO2 nanoparticles with a thin SiO2 shell significantly improved their anti-oxidation and anti-acid abilities. This result represents an important breakthrough in VO2 thermochromism, and it may have applications for near infrared modulation of glass used in construction or cars.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Qing Shu,Xinyuan Liu,Yanting Huo,Yuhui Tan,Caixia Zhang,Laixi Zou
A novel solid Brönsted-Lewis acid catalyst La-PW-SiO 2 /SWCNTs (single-wall carbon nanotubes) was synthesized from the synergistic modification of H 3 PW 12 O 40 (HPW) by single-walled carbon nanotubes functionalized with sidewall hydroxyl groups (SWCNTs–OH) and La 3+ via sol–gel method. The freshly prepared catalyst was characterized by several methods, and the catalytic activity and stability of it were studied from the esterification of oleic acid and methanol. Results showed that the highest conversion of oleic acid was 93.1% (mass) and maintained as high as 88.7% (mass) after six cycles of La-PW-SiO 2 /SWCNTs. The high catalytic activity and stability of La-PW-SiO 2 /SWCNTs can be attributed to the strong electron withdrawing effect of La 3+ on π bond of SWCNTs , because it can facilitate the formation of a large number of strong Lewis acid sites. Therefore, the reduction of catalytic activity of a solid acid catalyst due to the fact that hydration reaction of its Brönsted acid sites can be effectively reduced. La-PW-SiO 2 /SWCNTs can be an efficient and economical catalyst, because it shows good catalytic activity and stability.
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危险品化学品经营许可证（带存储）