SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Weiran Zhou,Yuchen Geng,Tao Zhou,Yu Wang,Huazhang Zhao,Xiaohui Wu,Jianfeng Li
Membrane distillation (MD) technology has shown unique advantages in treating saline organic wastewaters, however, improving membrane materials of anti-wetting/fouling properties is still agap for the large-scale application. In this study, a non-fluorinated composite membrane showing both good amphiphobic properties and high flux was synthesized by feasible electrostatic attraction. Characterizations indicated that SiO 2 nanoparticles were successfully loaded on the PVDF membrane (SiO 2 /PVDF) surface to form a multi-level rough amphiphobic structure, with contact angles of water and ethylene glycol as 139° and 128°, respectively. In MD tests, the SiO 2 /PVDF membrane exhibited a stable flux of 15 LMH with 3.5 wt% NaCl and 19.5 LMH with 50 mg/L kerosene. Notably, after a 24-hour continuous test, the flux remained above 9 LMH for NaCl and 11 LMH for kerosene, with salt rejection rates exceeding 98 %, indicating excellent anti-fouling characteristics. This study is expected to provide a feasible membrane modification for MD process in treating high saline organic wastewater.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xuerui Zhang,Shuo Wang,Yixin Ren,Xiaoting Fu,Xiaodong Bi,Xia Wang,Ru-Song Zhao
Fluorine-functionalized covalent organic frameworks (F-COFs), owing to their multiple interactions such as F-F forces and hydrophobicity, have been widely used as candidate materials for stationary phases and other analytical purposes. How to incorporate F-COFs with a silica matrix (SiO 2 ) through a low-energy consumption method, and investigating the chromatographic properties for pharmaceutical targets, is of vital importance and requires significant further research. In this study, pentafluorophenyl (PFP) was used as a functional group to prepare PFP-COF@SiO 2 at room temperature through two distinct synthetic approaches. The resulting PFP-COF@SiO 2 materials, designated as I and II, were systematically characterized, and their chromatographic performances, influential factors, and retention mechanisms were investigated. These two COF materials demonstrated similar material properties and effective separation towards phenolic acids, alkaloids and antiviral drugs. The results indicated that the designed two synthetic routes were to some extent tolerable and compatible with the order of reagent addition. This work offers a novel method for preparing PFP-COF@SiO 2 stationary phases oriented for pharmaceutical chromatographic applications.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xubao Jiang,Diankai Zhang,Yujun Wang,Ruiqing Wang,Xiang Zheng Kong,Xiaoli Zhu,Shusheng Li,Xiangling Gu
Raspberry-like microspheres have been widely used as superhydrophobic materials, photonic crystals, drug carriers, etc. Nevertheless, their preparation methods, usually consisting of multiple steps, are generally time- and energy-consuming. Herein raspberry-like SiO2@polyurea microspheres (SiO2@PUM) are readily prepared via a one-step precipitation polymerization of isophorone diisocyanate in a H2O/acetone mixture with the presence of SiO2 particles. The sphere size, surface roughness, and SiO2 content of SiO2@PUM are easily adjustable by varying the experimental conditions. TEM and SEM observations reveal that the final SiO2@PUM exhibits a core–shell structure, with polyurea (PU) in the core and SiO2 particles as the shell. In the process, the SiO2 particles were initially located on the PUM surface as a monolayer. With the reaction proceeding, the monolayer of SiO2 particles became thicker, forming a thicker layer of SiO2 particles on PUM due to the accumulation of SiO2 particles, leading to a multilayer structure of SiO2 particles on the shell of SiO2@PUM. The formation mechanism of the raspberry-like SiO2@PUM was thoroughly discussed and ascribed to electrostatic attraction between the positively charged PU and negatively charged SiO2 particles. Once dried, SiO2@PUM was superhydrophobic and turned hydrophilic if water-wetted. Using a layer of SiO2@PUM, effective separation with good reusability for a variety of oil–water mixtures was achieved regardless of the oil density and types of oil–water emulsions. This work presents a novel protocol for the preparation of raspberry-like microspheres with tunable wettability via a rapid and green process, and the resulting microspheres are highly effective for the separation of diverse types of oil–water mixtures.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PEDOSPHERE
·
2024
·
IF 5.2
Yue CAI,Lirong PU,Lianzhou SHEN,Xinghao WANG,Zhaoyue SUN,Guodong FANG,Dongmei ZHOU,Yunjiang YU,Juan GAO
Silica nanoparticles (nSiO 2 ) have attracted considerable attention in agricultural practices. However, their effects on polycyclic aromatic hydrocarbon (PAH) accumulation in plants remain largely unknown. Thus, this issue was tracked here with a 30-d pot experiment with foliar spraying different sizes of nSiO 2 (100 mg L -1 , 10 mL) on Amaranthus tricolor L. (amaranth). Results showed that 30 nm and 100 nm nSiO 2 increased phenanthrene (PHE) contents in amaranth leaves by 242% ± 88.4% and 158% ± 29.6%, respectively, which was more significant than 2 µm particles (96.0% ± 29.2%). Metabolomics indicated that compared to nSiO 2 , 2 µm SiO 2 more significantly boosted oxidative defense in amaranth leaves, enhanced cell membrane fluidity, and upregulated amino acid metabolism, glycolysis, and gluconeogenesis. In addition, the upregulation of discriminating metabolites was the most significant in 2 µm SiO 2 -treatment, followed by 100 nm and 30 nm. This is mainly because nSiO 2 promoted amaranth growth and decreased average PHE content per unit biomass, namely “dilute effect”. Thus, slighter metabolic disturbances were observed in 30 nm and 100 nm SiO 2 -treated group. The present study revealed the possibility of PAHs accumulation enhancement in vegetables with nSiO 2 foliar spayed. The results of this study provide theoretical guidance regarding to particle size selection for the safe agricultural application of nSiO 2 in PAHs-contaminated areas.
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Bao Guo,Hongjun Kang,Xinzhi Wang,Yitong Duan,Xiaotong Li,Baiqi Gao,Zhiqiang Wang,Yang Li,Songtao Lu,Xiaohong Wu
Addressing the issue of dust deposition on photovoltaic (PV) panels is of profound scientific significance and practical value for enhancing PV power generation. Transparent superhydrophobic coating is expected to be applied in the self-cleaning of PV panels. However, developing the transparent superhydrophobic dust removal coatings remains a challenge. Herein, we developed a highly transparent F-SiO 2 coating with dual self-cleaning and dust removal functions, composed of polydimethylsiloxane (PDMS) and SiO 2 . The coating demonstrates a high transmittance of 97 %. After self-cleaning and dust removal tests, conversion efficiency of F-SiO 2 coated PV decreased by only 0.03 % and 0.01 %, respectively, demonstrating excellent self-cleaning and dust removal performance. Additionally, the F-SiO 2 exhibits high stability. Mechanism analysis of dust removal performance reveals that the decreased effective dielectric constant from the porous structure and the reduced actual contact area between the particles and the superhydrophobic surface, thereby effectively reduces the van der Waals force between dust and coating. This work provides a novel strategy to prepare self-cleaning and dust removal coatings on PV cover plate.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Sheng-Jin He,Jia-Pei Chen,Wei-Ming Guo,Xiu-Bing Chen,Huan Zhou,Chuang-Tian Zhan,Shi-Kuan Sun,Yun Li,Li-Xiang Wu,Jia-Xiang Xue,Hua-Tay Lin
In this study, CaO–Al 2 O 3 –MgO–SiO 2 glass was utilized to join SiC after surface polishing and etching, without the application of pressure. To join polished SiC at 1250 °C using CaO–Al 2 O 3 –MgO–SiO 2 glass proved unsuccessful. However, when polished SiC was joined at 1350 °C, the joint shear strength was 108.0 ± 15.5 MPa. Etching polished SiC with a NaOH–K 3 [Fe(CN) 6 ] solution effectively removed surface carbon, resulting in numerous micro-pits, that increased the joining area and improved the wettability of CaO–Al 2 O 3 –MgO–SiO 2 glass. The joint strengths of etched SiC joined at 1250 °C and 1350 °C were 29.0 ± 11.6 MPa and 125.1 ± 19.6 MPa, respectively. After ablation at 1200 °C for 10 min, the retained strength of the etched joints (joined at 1350 °C) was 61.9 ± 4.0 MPa, whereas the strength of the polished joints decreased to only 36.6 ± 10.7 MPa. Surface etching demonstrates the potential to significantly enhance the strength and high-temperature resistance of SiC joints.
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Kai Cui,Jiaming Yang,Yuli Jing,Junwen Chen,Chen Zhao,Peng Wu,Xiaohong Li
Sustainability issues have led to a gradual market expansion for the 1,4-butanediol (BDO) monomer of the biodegradable plastics to replace conventional plastics. Maleic anhydride (MA) can be derived from the oxidation of bio-based furfural or fructose. Although the hydrogenation of MA can produce a series of products, including succinic anhydride (SA), γ-butyrolactone (GBL), BDO and tetrahydrofuran (THF), the one-pot deep hydrogenation of MA to BDO or THF under mild conditions has been rarely reported in the literature until now. Herein, we report the production of BDO from the one-pot deep hydrogenation of MA over a Cu–0.03Mo/SiO2 catalyst, achieving 100% MA conversion and 88.3% BDO yield. The Cu–0.03Mo/SiO2 catalyst also showed good long-term stability without obvious loss in activity or BDO selectivity during a 160 h time-on-stream test. Doping Mo to Cu/SiO2 catalysts in an optimal amount adjusted the distribution of Cu0/Cu+ species and modulated the interaction of Cu–SiO2 and surface acidity, so that the activation of hydrogen, MA and relevant intermediates can become balanced, in addition to the restriction of side-reactions. This study provides potential for the green synthesis of BDO with non-precious Cu-based catalysts.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Chen Cui,Yunfeng Fan,Yaxuan Chen,Renlong Wei,Jie Lv,Meng Yan,Dechen Jiang,Zhimin Liu
Cyanidin-3- O -glucoside (C3G), a natural antioxidant, plays multiple physiological or pathological roles in maintaining human health; thereby, designing advanced sensors to achieve specific recognition and high-sensitivity detection of C3G is significant. Herein, an imprinted-type electrochemiluminescence (ECL) sensing platform was developed using core-shell Ru@SiO 2 -CMIPs, which were prepared by covalent organic framework (COF)-based molecularly imprinted polymers (CMIPs) embedded in luminescent Ru@SiO 2 cores. The C3G-imprinted COF shell not only helps generate a steady-enhanced ECL signal, but also enables specific recognition of C3G. When C3G is bound to Ru@SiO 2 -CMIPs with abundant imprinted cavities, resonance energy transfer (RET) behavior is triggered, resulting in a quenched ECL response. The constructed Ru@SiO 2 -CMIPs nanoprobes exhibit ultra-high sensitivity, absolute specificity, and an ultra-low detection limit (0.15 pg mL −1 ) for analyzing C3G in food matrices. This study provides a means to construct an efficient and reliable molecular imprinting-based ECL sensor for food analysis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2017
·
IF 2.942
Yanwei Hu,Ziyu Liu,Yurong He
Boiling heat transfer is widely used in energy power equipment, while the poor thermal property conventional fluids cannot meet the increase of heat transfer demand. The addition of nanoparticles into base fluids can modify the properties of base fluids and is a potential way to improve heat transfer characteristics. In present work, amorphous SiO 2 nanoparticles with an average size of 98 nm were synthesized via Stober process. And they were added into water with different mass fractions to investigate the pool boiling heat transfer characteristics. The heat transfer coefficient and critical heat flux were analyzed. Results show that the heat transfer coefficient of all fluids increases rapidly in the natural convective region but then rises gradually in the nucleate boiling region. Moreover, owing to the deposition of SiO 2 nanoparticles, the heat transfer coefficients of SiO 2 -H 2 O nanofluids are lower than that of the base fluid and reduce as the concentration increase. On the other hand, because of the wettability improvement of the heating wire surface caused by the deposition of SiO 2 nanoparticles, the critical heat fluxes of nanofluids are higher than that of the base fluid. When the concentration is 0.081%, the critical heat flux achieves a peak improvement of approximately 68.8%.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Yongsheng Tan,Qi Li,Liang Xu,Chikezie Chimere Onyekwena,Tao Yu,Lifeng Xu
Nanoparticles effectively enhance the CO2 geological storage capacity by altering wettability during CO2–brine–rock interactions, which significantly impacts the CO2 residual trapping and migration in reservoirs. However, the effect of nanoparticles on CO2–brine–rock interactions in carbonate formations is poorly understood. Therefore, in this study, the impact of SiO2 nanoparticles (SNPs) on CO2–brine–rock interactions was evaluated under supercritical CO2 conditions (60 °C and 12 MPa) by analyzing wettability, conducting X-ray diffraction, scanning electron microscopy analyses, measuring weight loss, and performing low-field nuclear magnetic resonance (LFNMR) tests. The results indicated that (a) both CO2–brine–rock interactions and SNPs–CO2–brine–rock interactions can alter the wettability of carbonate rock surfaces from oil-wet to water-wet and that the carbonate rock became more water-wet after SNPs addition; (b) CO2–brine–rock interactions primarily involved the dissolution of calcite in carbonate rocks under acidic conditions, but SNPs–CO2–brine–rock interactions were more intense; (c) based on LFNMR analysis, the pores of the carbonate core in this study were divided into small pores (T2 < 5 ms) and large pores (T2 > 5 ms), with CO2–brine–rock interactions occurring mainly in the large pores of the carbonate cores but with enhanced interactions in small pores; (d) CO2 solubility in solution after CO2–brine–rock interactions increased with increasing pressure and eventually reached equilibrium, and this trend was observed both in the CO2–brine–rock system and the SNPs–CO2–brine–rock system. However, the CO2 solubility in the SNPs–CO2–brine–rock system was greater than that in the CO2–brine–rock system.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Jinglei Cui,Yujun Cui,Jingjing Tan,Huirong Zhang,Mengyuan Gu,Long Huang
Volatile organic compounds (VOCs) are one of the main pollutants produced in industrial processes. Catalytic oxidation is an effective method to eliminate VOCs, and the key lies in designing efficient metal catalyst. In this work, Pd-Pt/SiO 2 bimetallic catalysts were designed and prepared by the immobilization method, and their performances for toluene oxidation were evaluated. The addition of Pt into the catalyst elevated markedly the reduction of Pd active sites, leading to abundant electron-deficient Pd 0 and electron-rich Pt 0 in the Pd 2 Pt 1 catalyst, which were confirmed by TEM, CO pulse adsorption and in-situ XPS. As revealed by O 2 -TPD and toluene-TPD characterization, the cooperative effect of electron-deficient Pd 0 and electron-rich Pt 0 in Pd 2 Pt 1 catalyst facilitated the activation of O 2 and toluene, thus enhanced greatly its activity. A conversion of 90% (T 90 ) for toluene was achieved over Pd 2 Pt 1 catalyst at 165 ℃, and the apparent activation energy ( E a ) over Pd 2 Pt 1 catalyst was lower than that over other Pd-Pt bimetallic and monometallic Pd or Pt catalysts. Additionally, the reaction mechanism was studied by In - situ DRIFTS, the results showed that the toluene oxidation passed successively benzyl alcohol, benzaldehyde, benzoic acid and maleic anhydride , then maleic anhydride was further oxidized to CO 2 and water.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Zihao Guo,Zhihao Sun,Peng Wang,Jingyu Bi,Guangshen Li,Jianshu Wang,Ying Sha,Zhicheng Shi,Lei Qian
In this work, a negatively charged SiO 2 inner shell and a positively charged polyethylene imine (PEI) outer shell have coated onto a Ba 0.5 Sr 0.5 TiO 3 (BST) nanoparticle to fabricate core-double shell structure with a built-in electric field. This innovative structure is subsequently incorporated into poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) and polymethyl methacrylate (PMMA) hybrid organic matrix to prepare composite films with enhanced dielectric energy storage properties. The SiO 2 inner shell effectively mitigates the uneven electric field distribution caused by dielectric constant mismatch, and the PEI organic outer shell is designed to enhance the interfacial compatibility. Additionally, the dual shell structure exhibits a significant synergistic effect resulting from the built-in electric field, which successfully impedes the acceleration of internal charges and growth of electrical trees. COMSOL Multiphysics simulation results confirm that the core-double shell structure effectively alleviates the electric field distortion, leading to improved breakdown strength. Notably, the composite film demonstrates an energy storage density of 12.72 J/cm 3 under an electric field of 498.96 kV/mm with a low loading of 0.5 wt%, achieving 1.98 times that of the pure matrix. These findings provide valuable insights and directions for advanced polymer-based composite dielectric films with high energy storage densities.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）