ACS ES&T Water
·
2022
·
IF 0
Shuangling Xie,Jiale Du,Xuan Huang,Ailiang Gu,Shengqiong Fang,Riri Liu,Dong Zou,Jiuyang Lin,Ming Xie,Shuaifei Zhao,Wenyuan Ye
Membrane distillation (MD) has been widely used for resource recovery from high-salinity wastewater, due to its superior technical merits of high separation efficiency and potential integration of low-grade heat. Herein, a robust superhydrophobic PVDF membrane prepared by spray-coating of fluorinated silica nanoparticles was employed to treat highly saline dye wastewater by MD. Specifically, impacts of operation conditions, including temperature difference, feed flow-rate, salinity, dye concentration, and dye species, on MD performance of the fabricated superhydrophobic PVDF membrane were comprehensively investigated. The increase of temperature difference and feed flow-rate had a positive effect on the MD flux of the membrane. Conversely, the rise in salinity and dye concentration induced an adverse impact on the MD flux. Furthermore, the superhydrophobic PVDF membrane showed a strong robustness in treating complex streams, as demonstrated by consistently stable MD flux using various dye/NaCl mixed solutions. Due to the robust surface superhydrophobicity, the fabricated PVDF membrane exhibited impressive antiwetting and antifouling properties against highly saline dye wastewater, consistently stable permeation flux, and high dye/salt removal efficiency (>99.99%). Moreover, the superhydrophobic membrane showed a high water recovery (90%) from highly saline dye wastewater with a slight reduction (13.4%) in permeation flux during a 39 h MD filtration. These results signify the promising practicability of the fabricated superhydrophobic PVDF membrane in sustainable management of highly saline dye wastewater via MD.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2022
·Vol. 26
·期 7
·e202200631
·
IF 2.551
Yue Yu,Zhongwu Lv,Haijun Zhong,Wei Bai,Min Ji
Graphical A supported bi-sulfate catalyst Fe x Zn y /SiO 2 was prepared for isobutene selective oligomerization to obtain higher C 8 = yield. The catalytic performance of Fe x Zn y /SiO 2 were superior to the supported single-sulfate catalysts (Fe x /SiO 2 or Zn y /SiO 2 ) because of the synergetic effect of the Brönsted and Lewis acid sites and the electron-donating Fe 2+ species. Among them, the Brönsted and Lewis acid sites can trigger the oligomerization of isobutene by forming carbocation intermediate and the Fe 2+ is easy to give electron to inhibit the growth of carbon chain and thus form isooctane. Isobutene dimerization is an important route to properly utilize mixed C 4 and further produce isooctane with a high-octane number to replace MTBE in gasoline. A highly selective catalyst, which is effective for isobutene dimerization but ineffective for other olefins in the C 4 mixture, is necessary for industrial implementation. In this work, a series of supported metal sulfate catalysts Fe x Zn y /SiO 2 were prepared and characterized by XRD, SEM, N 2 physical adsorption-desorption, NH 3 -TPD, Py-FTIR, and XPS. Fe 0.2 Zn 1.8 /SiO 2 can achieve isobutene conversion up to 89 % with 0 % conversion of n -butene, and the selectivity of isooctenes (C 8 = ) product is 57 % (10 h on stream). Furthermore, isobutene conversion can sustain above 80 % after 50 h. It is found that these supported catalysts contain Zn 2+ , Zn + , Fe 3+ , and Fe 2+ species, and there is a synergetic effect between Zn 2+ and Fe 2+ . Zn 2+ is beneficial to improve the conversion of isobutene, and Fe 2+ facilitates the formation of C 8 = , resulting in a high C 8 = yield.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 46
·22143-22150
·
IF 3.925
Yanwen Guo,Xingjian Liu,Bing Hu
A novel supported deep eutectic solvent (DES) TBAB/PEG-200 was prepared by loading DES TBAB/PEG-200 onto mesoporous silica by the sol–gel method. The properties of the supported deep eutectic solvent TBAB/PEG-200 were characterized by FT-IR, XRD, SEM, BET analysis, and TG. The adsorption oxidation desulfurization system was studied using environmentally friendly H2O2 as an oxidant and typical heterocyclic sulfide dibenzothiophene (DBT) was dissolved in n-octane as a simulated oil. After the optimization of preset experimental parameters, the DBT content in the simulated oil could be removed deeply and effectively under the optimal reaction conditions m(25%-DES/SiO2) = 0.20 g, T = 60 °C, O/S = 14, t = 60 min. The catalyst was reused more than 9 times with no significant decrease in the desulfurization rate. Finally, the possible adsorption oxidative desulfurization mechanism was proposed.
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高影响因子
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 4
·2500-2511
·
IF 5.2
Ning Guo,Zifan Tang,Jiaming Sun,Yulong Wang,Lili Li,Junguo Gao
In this paper, SiO 2 particles with three particle sizes of 60 nm, 2 μm, and 25 μm were added as fillers into the composites prepared by epoxy resin and micron silicon carbide to investigate the mechanism of SiO 2 particle size on the nonlinear electrical conductivity and breakdown characteristics of the composites. Compared with SiC/EP composites, the smaller the added SiO 2 particle size, the lower the current density at high fields and the higher the breakdown field strength of SiO 2 /SiC/EP composites. The nonlinear coefficients of SiO 2 /SiC/EP composites increased slightly with the addition of 1phr 25 μm SiO 2 and 4phr 2 μm SiO 2 , and the breakdown field strengths were increased by 55.36% and 66.77%, respectively. The SiO 2 /SiC/EP composites with the addition of 4phr 60 nm SiO 2 particles showed the most significant attenuation of the conductivity current and the most prominent enhancement of the breakdown field strength, but the nonlinear coefficient was reduced by 24.6%. With the increase of SiO 2 doping amount, compared with the composites with the same particle size and low doping amount, the larger the SiO 2 particle size, the decrease of the current density of the composites under high field intensity is more obvious, and the dielectric constant drops even more.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Wei Xie,Yulong Ju,Jian Zhang,Yiwen Yang,Yanbo Zeng,Hailong Wang,Lei Li
A magnetic Fe 3 O 4 @SiO 2 @MIPIL fluorescent sensor for the determination of imidacloprid (IMD) with high sensitivity and specificity was prepared through surface molecular imprinting technology on the surface of Fe 3 O 4 @SiO 2 by using dialkenyl ionic liquid (C) as a fluorescent polymer monomer . The as-prepared sensor was characterized by thermogravimetric, FT-IR, SEM, TEM, and nitrogen adsorption-desorption analysis. Results showed that IMD rapidly quenched the fluorescence of the sensor within 1 min and had an excellent linear relationship to the fluorescent quenching intensity of the sensor within the range of 1–1000 nM (IMD). The LOD was 0.3 nM (S/N = 3). The sensor had a specific response to IMD and was used to detect IMD in actual spiked environmental water and food samples with satisfactory result.
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PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Tian Hao,Yao Wang,Miaorong Zhang,Zhipeng Liu,Jixian Liu,Linjun Huang,Jie Li,Yao Peng,Jianguo Tang
The graphene oxide-silica, GO-SiO 2 (GS) nanoparticles synthesized by in-situ hydrolysis were grafted with block polymers polyethylene glycol (PEG) and low-molecular polyethylene terephthalate (LPET) using 3-isocyanatopropyltrimethicone (IPTES) as a bridge to prepare the additive GS-IPTES plus PEG-LPET (GSIP). This grafting process was confirmed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The GSIP of various contents was used as reinforcing fillers to prepare PET/GSIP composite by melt blending. The crystallization and mechanical properties of the PET/GSIP composite were dramatically enhanced with the addition of small amounts of GSIP. Compared with pure PET, the crystallization temperature of PET/GSIP was increased by 41 °C at 1 wt.% addition of GSIP. Moreover, the highest tensile strength was 91.2 MPa and the highest modulus was 14.7 GPa at 0.8 wt.% addition. The crystalline and mechanical properties improvements were attributed to the synergistic effects of GS and block polymer chains.
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高影响因子
GREEN CHEMISTRY
·
2022
·Vol. 24
·期 5
·2240-2248
·
IF 11.034
Yanlong Qi,Ruilin Feng,Shijun Liu,Long Cui,Quanquan Dai,Chenxi Bai
Functionalized monomers are of utmost importance in producing new polymers and smart materials. Herein, a two-step approach involving heterogeneous catalysis was developed to produce a functionalized monomer (2-vinylfuran) from bio-based furfural, giving an overall yield of 89%. Economic analysis suggests that this facile approach incurs much lower costs, and its practicality improves the availability of 2-vinylfuran. This is due to the delicate structure of the optimized 4Na5Ce/SiO2, where Na species are present at the oxygen vacancies of the ceria that protect the catalyst structure from collapse, and the catalyst consequently displays excellent performance. Density functional theory (DFT) calculations revealed that the reaction occurs on the Na and Ce species. The adsorption of a furan group onto Na led to side reactions, which were suppressed in the presence of Ce, resulting in higher selectivity. Finally, a polymer based on 2-vinylfuran was prepared, which shows good surface properties and thermodynamic stability.
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高影响因子
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
·
2022
·Vol. 61
·期 18
·e202117201
·
IF 16.823
Jiaqi Si,Guofeng Zhao,Weidong Sun,Jincun Liu,Cairu Guan,Yong Yang,Xue-Rong Shi,Yong Lu
Graphical For the oxidative coupling of methane (OCM) reaction, the MnO x -Na 2 WO 4 /SiO 2 catalyst enriched with Q 2 units in the SiO 2 carrier achieves 23 % CH 4 conversion and 72 % C 2–3 selectivity at 660 °C. A large number of Q 2 units in MnO x -Na 2 WO 4 /SiO 2 is a trigger for markedly lowering the light-off temperature of the Mn 3+ ↔Mn 2+ redox cycle because of the easy formation of MnSiO 3 . Oxidative coupling of methane (OCM) catalyzed by MnO x -Na 2 WO 4 /SiO 2 has great industrial promise to convert methane directly to C 2–3 products, but its high light-off temperature is the most challenging obstacle to commercialization and its working mechanism is still a mystery. We report the discovery of a low-temperature active and selective MnO x -Na 2 WO 4 /SiO 2 catalyst enriched with Q 2 units in the SiO 2 carrier, being capable of converting 23 % CH 4 with 72 % C 2–3 selectivity at 660 °C. From experiments and theoretical calculations, a large number of Q 2 units in the MnO x -Na 2 WO 4 /SiO 2 catalyst is a trigger for markedly lowering the light-off temperature of the Mn 3+ ↔Mn 2+ redox cycle involved in the OCM reaction because of the easy formation of MnSiO 3 . Notably, the MnSiO 3 formation proceeds merely through the SiO 2 -involved reaction in the presence of Na 2 WO 4 : Mn 7 SiO 12 +6 SiO 2 ↔7 MnSiO 3 +1.5 O 2 . The Na 2 WO 4 not only drives the light-off of this cycle but also gets it working with substantial selectivity toward C 2–3 products. Our findings shine a light on the rational design of more advanced MnO x -Na 2 WO 4 based OCM catalysts through establishing new Mn 3+ ↔Mn 2+ redox cycles with lowered light-off temperature.
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PubMed
高影响因子
Chemosensors
·
2022
·Vol. 10
·期 5
·170
·
IF 4.229
Henggan Li,Feiming Li,Yipeng Huang,Linchun Zhang,Min Ye,Jingwen Jin,Xi Chen
In this study, CsPbBr3@SiO2perovskite nanocrystal composites (CsPbBr3@SiO2PNCCs) were synthesized by a benzyl bromide nucleophilic substitution strategy. Homogeneous halide exchange between CsPbBr3@SiO2PNCCs and Cl−solution (aqueous phase) was applied to the determination of Cl−in sea sand samples. Fast halide exchange with Cl−in the aqueous phase without any magnetic stirring or pH regulation resulted in the blue shift of the photoluminescence (PL) wavelength and vivid PL color changes from green to blue. The results show that the PL sensing of Cl−in aqueous samples could be implemented by using the halide exchange of CsPbBr3@SiO2PNCCs. A linear relationship between the PL wavelength shift and the Cl−concentration in the range of 0 to 3.0% was found, which was applied to the determination of Cl−concentration in sea sand samples. This method greatly simplifies the detection process and provides a new idea for further broadening PL sensing using the CsPbBr3PNC halide.Keywords:CsPbBr3perovskite nanocrystal composites;colorimetric sensing;photoluminescence wavelength shift;sea sand;Cl−
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Qian Zhang,Zhiwei Guo,Yujie Yang,Yanxiang Li,Chuanfang Yang,Wangliang Li
Surfactants in ultra-low sulfur diesel (ULSD) can improve the stability of the emulsified water droplet by forming a thin film at the water-fuel interface. Emulsified water droplets block the oil spray nozzle and break down the engine, which need to be removed. For colliding emulsified water droplets, surfactant film with high viscoelastic modulus provides an obstacle to their coalescence. Micro/nanosized-SiO 2 particles were added into ULSD to interrupt the arrangement of the surfactant film. After adding with 20 nm SiO 2 , the interfacial tension of water-monoolein-ULSD increased from 16.0 mN/m to 21.4 mN/m, and its viscoelastic modulus decreased from 17.1 mN/m to 10.9 mN/m, a decrease of 36.3%. It proved that the addition of nanosized SiO 2 into water-monoolein-ULSD system increased the interfacial tension and reduced the viscoelastic modulus of the monoolein film. However, after adding nanosized SiO 2 , the viscoelastic modulus of the water-PETO-B-ULSD layer had no significant changes. Therefore, we concluded that 20 nm SiO 2 disturbed the dense packing of monoolein as its adsorption to surfactants and the electrostatic repulsion force between them and the hydrophobic group, resulting in a decrease in elastic modulus . However, PETO-B had a complex branched structure leading to a loose packing, which had unoccupied adsorption sites and barely affected by the intrusion of 20 nm SiO 2 . Therefore, this research provided a strategy to add nanosized-SiO 2 into W/O emulsions containing monoolein-like surfactant to reduce its stability.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Jiahui Lu,Nan Sheng,Chunyu Zhu
Phase change materials (PCMs) using metals/alloys have been concerned for medium temperature solar thermal storage and waste heat recovery. However, the PCMs may leak due to the solid-liquid phase change, which greatly limits the use of metallic PCMs. In this study, we report the synthesis of microencapsulated PCMs (MEPCMs) using metallic Sn as PCM core and a sol-gel coated SiO 2 as shell. The as-coated microcapsules are further undergone a high temperature heat treatment at oxygen/nitrogen atmosphere. Due to the self-repairing effect, the cracked microcapsules can be sealed and stabilized, thereby forming high stabilized MEPCMs over 100 cycles. The melting point and latent heat of the Sn@SiO 2 –O 2 microcapsules were around 233 °C and 56 J g -1 respectively, while the values were around 233 °C and 58 J g -1 for Sn@SiO 2 –N 2 microcapsules, similar to the theoretical values of metallic Sn. The successfully prepared Sn@SiO 2 MEPCMs could find wide applications in medium temperature thermal energy storage .
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Mengmeng Yang,Zhaofeng Chen,Lixia Yang,Yang Ding,Xiaoyang Chen,Manna Li,Qiong Wu,Tianlong Liu
Environmental noise has been regarded as major noise pollution with severe hazards to human physical and mental health. The common commercial fiber sound-absorption materials have insufficient low frequencies wave absorbing and fire-resistant ability, limiting their wide application. To solve these problems, a novel strategy combining flexible nanofibers and rGO/MXene nanosheets was proposed to fabricate rGO/MXene/SiO 2 nanofibers composite aerogel with hierarchically porous structure, which possessed an extremely low density of 9.8 mg/cm 3 and superior low-frequency sound absorption ability (NRC value of 0.51). The obtained composite aerogel possessed a large deformation up to 80% (corresponding compressive stress of 17 kPa) and quickly recovered. In addition, the as-prepared aerogel could be easily produced on a large scale, providing a reference for the development of new generation of sound-absorbing products.
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高影响因子
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