SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Maoquan Wu,Yang Yang,Shouchun Ma,Xu Guo,Haochen Yu,Yaodan Cao,Jie Wu,Li Liu,Tongjie Yao
Designing and developing efficient photocatalysts for H 2 evolution and simultaneous oxidation of benzyl alcohol (BA) in aqueous environments provides a cutting-edge strategy for green synthesis. Nevertheless, the photocatalysts suffer from the low photoconversion efficiency because of the sluggish dynamics and repaid recombination of photogenerated charge carriers, which hindering their widespread applications. To address the limitation, a multifunctionnal sulfur vacancies (SVs) modified ZIS-Vs@NIS S-scheme heterojunction with a strong interfacial electric field effect was synthesized to use photocatalytic H 2 production and BA oxidation, simultaneously. Experimental analysis supports that the synergistic effect of SVs and S-scheme heterojunction engineering result in a suitable energy band structure alignment and larger Fermi level potential difference. Those factors can realize effective charge transfer and separation, and enhance the photocatalytic performance. As anticipated, ZIS-Vs@NIS exhibited a superior photocatalytic performance with H 2 and benzaldehyde (BAD) yields up to 168.1 and 146.1 μmol under the simulated solar-light irradiation for 1.0 h, respectively, which are approximately 13.3 and 11.8 times higher than pristine ZIS. Moreover, the photocatalytic H 2 evolution coupled with BA oxidative dehydrogenation mechanism via S-scheme heterojunction over ZIS-Vs@NIS is also demonstrated in detail.
研究领域:
材料科学
·
环境科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Jianfeng Li,Shujuan Guo,Zhaozan Xu,Jianguo Li,Zihe Pan,Zhiping Du,Fangqin Cheng
In order to reduce the wetting and fouling propensity of polyvinylidene fluoride (PVDF) membrane during coking wastewater treatment by membrane distillation, two kinds of omniphobic PVDF composite membranes were prepared by coating SiO 2 nanoparticles on PVDF membrane surface via electrostatic adsorption or chemical bonding respectively, and subsequently fluorination. The coated SiO 2 nanoparticles observed as amounts of nano-scale protrusions by scanning electron microscope constructed a re-entrant structure and enhanced membrane surface roughness . The omniphobicity of the modified membranes was confirmed by high contact angles (> 150°) for water, diiodomethane and ethylene glycol on the membrane surface. The omniphobic layer with SiO 2 nanoparticles coated via chemical bonding was more stable than electrostatic adsorption. Both the omniphobic PVDF membranes exhibited stable and high rejections of the inorganic and organic contaminants, which were determined by conductivity, total organic carbon and three-dimensional excitation-emission fluorescence spectroscopy of the distillate. The modified omniphobic membranes also showed much less flux decline than the pristine PVDF membrane in direct contact membrane distillation tests (120 h), suggesting their excellent anti-fouling performance. This study indicates that coating silica nanoparticles via chemical bonding is an effective and promising method to fabricate omniphobic PVDF membrane for coking wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2025
·
IF 7.1
Minghua Liu,Ran Bi,Guang Wang,Donghui Han,Zhuang Wang,Juan Wu,Ping Ding,Ye Wu,Shou Yang,Qi Yu
The widespread use of titanium dioxide (TiO 2 NPs) and zinc oxide nanoparticles (ZnONPs) in sunscreens necessitates a deeper understanding of their size-dependent aquatic toxicity and interaction mechanisms. This study systematically evaluates the individual and combined effects of TiO 2 NPs (5-10, 40, 100 nm) and ZnONPs (30, 50, 90 nm) on Chlorella vulgaris , integrating physicochemical behavior, oxidative stress responses, and interaction effects. ZnONPs exhibited 5.0–12.6 times higher toxicity than TiO 2 NPs, with EC 50 values of 55.9–77.0 mg L -1 for ZnONPs versus 385.8–704.3 mg L -1 for TiO 2 NPs. Smaller TiO 2 NPs (5–10 nm) showed greater toxicity ( EC 50 = 385.8 mg L -1 ) than larger ones (704.3 mg L -1 for 100 nm), while larger ZnONPs (90 nm) released 40% more Zn 2+ ions than smaller ones (20% for 30 nm). Joint toxicity presented was antagonistic at high concentrations but synergistic at low ( EC 5 ) and environmental levels ( p < 0.05). Small-sized mixtures (10 nm TiO 2 NPs + 30 nm ZnONPs) and large-sized mixtures (100 nm TiO 2 NPs + 90 nm ZnONPs) elevated malondialdehyde (MDA) levels by 1.8-fold compared to individual treatments. After 48 h depuration, reductions in MDA and superoxide dismutase (SOD) activities suggested cellular self-recovery, except the medium-sized mixtures remained persistent reactive oxygen species (ROS) depletion and impaired enzymatic recovery at specific concentration levels. These results provide new insights into nanoparticle toxicity mechanisms, underscoring that synergistic effects at environmentally realistic concentrations (ng L -1 to μg L -1 ) may pose unanticipated ecological risks to primary producers and disrupt aquatic food webs.
研究领域:
环境毒理学
·
纳米毒理学
·
水生生态学
·
藻类学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2025
·
IF 1
Yuansheng Tang,Wentian Zheng,Wei Bi,Guangxing Yang,Zibo Wang,Fengmi Zeng,Xianhui Li
Liquid-liquid membrane contactors (LLMC) and Gas-liquid membrane contactors (GLMC) have emerged as promising candidates for energy-efficient ammonia recovery, leveraging their unique interfacial transport characteristics and superior thermal/chemical stability. However, critical knowledge gaps persist in their mass transfer resistance and operational parameter sensitivity during ammonia absorption. This study conducts a systematic comparative analysis of LLMC and GLMC systems through integrated mass transfer modeling and experimental validation under equivalent operating conditions. Results showed that higher pH value was beneficial to the increase of ammonia absorption rate and the reduction of ammonia mass transfer in the LLMC system, whereas the GLMC showed stronger dependence on the feed flow velocity. The long-term stability testing demonstrated that the LLMC was more suitable for the treatment of wastewater with higher ammonia concentration, whereas the GLMC had an advantage for treating wastewater with lower ammonia concentration particularly under the intermittent operation. This work provides guidance in selection criteria for membrane contactor implementation, advancing the development of precise-controlled ammonia recovery systems in wastewater treatment.
研究领域:
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2024
·
IF 7
Zhe Li,Xiaosui Luo,Abid Naeem,Zhengji Jin,Qiong Li,Yongmei Guan,Lihua Chen,Weifeng Zhu,Liangshan Ming
Polyvinylpyrrolidone K30 was used as the templating agent, and ammonium bicarbonate was used as the pore-forming agent to make porous mannitol and porous lactose by the template and pore-forming agent method, respectively. Compared with the template method, the porous particles prepared by the pore-forming agent method have larger pore diameter (320.276 nm and 250.528 nm) and specific surface area (1.018 m 2 /g and 0.913 m 2 /g). The molecular docking results showed that mannitol/lactose interacted with curcumin and adhered to each other through hydrogen bonding. The adsorption kinetics process of porous mannitol and porous lactose prepared by template agent, pore-forming agent and curcumin were different. Among the curcumin-loaded porous particles prepared by the two methods, the curcumin-loaded porous lactose prepared by the pore-forming agent method had the fastest release rate and the highest cumulative release rate (95 %). Curcumin releases consistent with the Peppas release kinetics model and the diffusion mechanism.
研究领域:
药剂学
·
生物材料学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2017
·
IF 4.162
Fei Wang,Fan Yang,Yang Tian,Jiawei Liu,Jiwei Shen,Quan Bai
A stoichiometric displacement model for retention (SDM-R) of small solutes and proteins based on hydrophilic interaction chromatography (HILIC) was presented. A linear equation that related the logarithm of the capacity factor of the solute to the logarithm of the concentration of water in the mobile phase was derived. The stoichiometric displacement parameters, Z (the number of water molecules required to displace a solute from ligands) and lg I (containing a number of constants that relate to the affinity of solute to the ligands) could be obtained from the slope and the intercept of the linear plots of lg k' vs. lg[H 2 O]. The retention behaviors and retention mechanism of 15 kinds of small solutes and 6 kinds of proteins on 5 kinds HILIC columns with different ligands were investigated with SDM-R in typical range of water concentration in mobile phase. A good linear relationship between lg k' and lg[H 2 O] demonstrated that the most rational retention mechanism of solute in HILIC was a stoichiometric displacement process between solute and solvent molecules with water as displacing agents, which was not only valid for small solutes, but also could be used to explain the retention mechanism of biopolymers in HILIC. Comparing with the partition and adsorption models in HILIC, SDM-R was superior to them.
研究领域:
分析化学
·
生物化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2014
·
IF 6.007
Ze’ai Huang,Qiong Sun,Kangle Lv,Zehui Zhang,Mei Li,Bing Li
In this paper, effect of contact interfaces of high-energy TiO 2 , (1 0 1) and (0 0 1) facets, with g-C 3 N 4 on the photocatalytic activity of g-C 3 N 4 /TiO 2 hybrid was studied using TiO 2 hollow nanobox (TiO 2 -HNB) assembly from high-energy TiO 2 nanosheets (TiO 2 -NS) as model. The prepared photocatalyst was characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscopy (SEM), nitrogen sorption , Fourier transform infrared spectroscopy (FT-IR), diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectrometer (XPS). The photoreactivity of the photocatalyst was evaluated by measure the formation rate of photo-induced hydroxyl radicals ( OH) using coumarin as a probe molecule and photocatalytic degradation of Brilliant Red X3B (an anionic dye) under UV irradiation ( λ = 365 ± 10 nm). It was found that g-C 3 N 4 /TiO 2 -HNB forms direct Z-scheme photocatalytic system, which shows superior enhancement on the photocatalytic activity of TiO 2 than g-C 3 N 4 /TiO 2 -NS. It is by contacting g-C 3 N 4 with (1 0 1) facets, g-C 3 N 4 can efficient remove the photo-generated electrons accumulated on (1 0 1) facets of high-energy TiO 2 , which results in spatially isolated photo-generated electrons and holes, enhancing the photocatalytic activity.
研究领域:
材料科学
·
环境科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Chong Liu,Fang Cheng,Bo Liu,Dongdong Gao,Gang Cheng,Chunmei Li,Huanan Wang,Wei He
Surface-initiated polymerization is an attractive approach to achieve desired interfacial compositions and properties on a wide range of substrates and surfaces. Due to mild reaction conditions, multiple surface-initiated polymerization methods, such as atom-transfer radical polymerization (ATRP), reversible addition–fragmentation chain-transfer polymerization, and so forth, have been developed and studied in academia and industry. However, the current methods require the combination of metal catalysts, special initiators, and oxygen removal. Herein, we developed a surface-initiated carbanion-mediated anionic polymerization (SI-CMAP), which can be conducted in aqueous solutions in the presence of oxygen without the need for metal catalysts. Zwitterionic 2-(N-3-sulfopropyl-N,N-dimethyl ammonium)ethyl methacrylate (SBMA) was selected as a model monomer to develop and demonstrate this strategy. The vinyl sulfone (VS) groups displayed on substrate surfaces reacted with N-methylimidazole (NMIM), which was used as the in situ initiator. The polymerization mechanism was extensively studied from many aspects at room temperature, including the changes in reaction conditions, factors affecting the polymerization extent, and substrate surfaces. We also demonstrated the compatibility of this method with a broad spectrum of monomers ranging from SBMA to other acrylates and acrylamides by using glycine betaine as a reaction additive. This method was also evaluated for the preparation of polymer-coated nanoparticles. For polymer-coated silica nanoparticles, their hydrodynamic diameter, copper contamination, and effects of salt and protein concentrations were compared with SI-ATRP in parallel. SI-CMAP in aqueous solutions in air and the absence of metal catalysts make this method sustainable and cost-effective. We believe that SI-CMAP can be readily adapted to the industrial surface coating and large-scale nanoparticle preparation under mild conditions.
研究领域:
聚合物化学
·
材料科学
·
表面科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）