Membranes
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2021
·Vol. 11
·期 4
·268
·
IF 4.106
Bin Jiang,Binxing Hu,Na Yang,Luhong Zhang,Yongli Sun,Xiaoming Xiao
Nanofiltration membrane technology is an effective method for secondary treated sewage purification. However, membrane fouling, which is inevitable in the membrane-separation process, can reduce membrane performance and shorten membrane life. Installing a turbulence promoter is a promising means of improving the hydraulic conditions inside the membrane chamber. In this study, the effect of turbulence promoter on prolonging membrane life was studied for the first time. Flat-sheet polyethersulfone nanofiltration membrane was used to filter humic acid solution, used for simulating secondary treated sewage. By comparing photographs and SEM images of the membrane before and after the simulated secondary treated sewage filtration, it was found that humic acid tended to be deposited on the low-velocity region, which was reflected by COMSOL simulation. After incorporating a turbulence promoter, the reduction of the humic acid deposition area and membrane fouling resistance indicated that the turbulence promoter could reduce membrane fouling due to the improved hydraulic conditions. Additionally, the turbulence promoter also increased the flux and reduced the flux decay rate. The turbulence promoter was then place in the crossflow flat-sheet membrane filtration module, and the variation of flux with time was tested in simulated secondary treated sewage with different concentrations. The results showed that the membrane life for the filtration of simulated secondary treated sewage comprising 50, 250, and 500 ppm humic acid increased by 23.1%, 80.4%, and 85.7%, respectively. The results of this article can serve as a reference for the prediction of membrane life and the performance enhancement mechanism of membranes containing a turbulence promoter.Keywords:turbulence promoter;membrane life;COMSOL simulation;sewage treatment;membrane fouling
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Zhong Wang,Xinjia Tan,Chuhan Wang,Guojian Li,Shuang Yuan
Ni/NiO is regarded as an ideal candidate material to replace noble metal catalysts due to its good corrosion resistance and excellent hydrogen evolution activity. However, the poor stability of Ni/NiO catalyst in the process of long-term water electrolysis limits its large-scale application. In this study, a facile hydrothermal method was used to successfully synthesize highly active and stable nanoparticulate Mo–Ni/NiO catalysts. Density functional theory (DFT) shows that Mo doping can optimize the charge transfer of Ni/NiO, reduce the d-band center and accelerate the H* dissociation from the catalyst surface. COMSOL numerical simulation further confirmed that the granular structure can enhance the ion concentration and promote H 2 generation. Electrochemical tests showed that the overpotential of Mo–Ni/NiO was only 45 mV when the current density was 10 mA cm −2 in 1 M KOH solution, which was much lower than 158 mV of Ni/NiO. Furthermore, Mo–Ni/NiO exhibited superior stability when operated at a current density of 10 mA cm −2 for 150 h with a reduction of overpotential of only 2 mV. This work provides a simple method for improving the HER activity of catalysts with Mo doping, which provides a new idea for designing catalysts with high activity, excellent stability and low cost.
研究领域:
电化学
·
材料科学
·
催化
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Weixin Miao,Songliang Liu,Yuewen Sun,Cong Zhang,Meixiang Zheng,Guangshuo Li,Xuejing Cui,Xin Zhou,Luhua Jiang
Electrocatalysis, a form of heterogeneous catalysis, is closely associated with both catalyst properties and the catalyst/electrolyte interfacial microenvironment. Herein, we rationally design and synthesize a unique PdCu nano-sea urchins (PdCu NSUs) featured with high-curvature nanotips, by which the interfacial microenvironment is expected to be tailored to the electrocatalytic reactions. PdCu NSUs exhibit excellent activity for ethanol electrooxidation, with a specific activity of 4.11 mA cm −2 and a mass activity of 2.24 mA μg Pd −1 , and a high Faraday efficiency (FE) of 96.4% toward acetic acid. COMSOL finite element simulations confirm that the unique nanotips could induce a local electric field due to the accumulation of positive charges in the nanotips, resulting in enrichment of OH - at the catalyst surface to promote the formation of Pd−OH ads , a species required by ethanol dehydrogenation. Furthermore, DFT calculations and in-situ electrochemical Fourier transform infrared spectroscopy discover that the d-band center of Pd significantly downshifts in PdCu alloy, which facilitates the desorption of the produced acetic acid. This work provides a new electrocatalytic material with high-curvature nanotips, and also clarifies how the material morphology, by inducing local electric fields, affects the interfacial microenvironment and thus the catalytic activity and selectivity.
研究领域:
电催化
·
纳米材料
·
表面化学
·
计算化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2022
·
IF 6.556
Xiaoli Wang,Junwang Ji,Pengfei Yang,Xinyu Li,Yiquan Pang,Panpan Lu
The detection of cancer markers still has shortages of low sensitivity, time-consuming operation, the use of unstable and expensive antibodies. In this work, a novel Love-mode surface acoustic wave (LSAW) aptasensor with dummy fingers based on the monolayer molybdenum disulfide/gold nanoparticles (monolayer MoS 2 /Au NPs) was developed for the highly sensitive and rapid determination of alpha-fetoprotein (AFP) in serum. Interdigital electrodes (IDTs) with dummy fingers were designed and applied to improve the acoustic characteristic of the LSAW aptasensor. The less energy dissipation and wave-front distortion of the LSAW aptasensor were confirmed by COMSOL simulation and test results. The newly-developed sensing film monolayer MoS 2 /Au NPs/Apt/6-mercaptohexanol (MCH) was applied for the specific detection of AFP and significantly improved the sensitivity of the LSAW aptasensor. The excellent performance of the LSAW aptasensor allowed the sensitive and rapid detection of AFP in serum in the range of 0.01 ⁓ 100 ng/mL with a low detection limit of 4.79 pg/mL. Additionally, the proposed LSAW aptasensor exhibited excellent selectivity , long-term stability, and reproducibility, and could be used to detect other cancer biomarkers.
研究领域:
生物传感器
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纳米技术
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癌症诊断
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表面声波技术
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xueying Fan,Wen Zhang,Yongsheng Xu,Jie Zheng,Yang Li,Xiaobin Fan,Fengbao Zhang,Junyi Ji,Wenchao Peng
Tailoring the porous structure of carbon materials is one essential approach to improve the energy storage performance of carbon-based electrode materials . Herein, hierarchical porous carbons (HPCs) with different meso -structure are synthesized via a one-pot pyrolysis process with SiO 2 and ZnCl 2 as template and activator, respectively. The energy storage capacities of the obtained HPC samples are investigated as bi-functional electrode both for supercapacitor and LIBs . The results show that different meso -structure of HPCs can effectively affect the energy storage performance. In the range of 15 ∼ 50 nm, smaller size of mesopore can result better electrochemical performance of HPCs. And the optimized HPC sample (HPC-15) manifests high specific capacitance of 432F g −1 and good cyclic stability in the supercapacitor application. When used as anode of LIBs, the HPC-15 presents a high capacity of 820 mAh g −1 . In addition, COMSOL simulation is employed to study the effect of pore structure on mass transfer during electrochemical process. The HPC-15 is calculated to have the highest total porosity (ε p ) and effective diffusivity of K + (D e = 6.776 × 10 -10 m 2 s −1 ), thus leading to its best electrochemical performance.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 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）