FUEL
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2025
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IF 7.5
Liang Chu,Zhaokun Wang,Zhaohui Liu,Teng Zhao,Liyan Wang,Mu Yang,Ge Wang
Host-guest catalysts are promising for tailored applications but require innovative synthesis strategies. Herein, we report the first ambient aqueous-phase synthesis of bimetallic Ce/Zr MOF-801, followed by acid post-treatment. Utilizing defect engineering, Ce species are preferentially exposed within the robust Zr-MOF-801 substrate. This structural modification substantially enhances the host–guest catalyst’s oxidative desulfurization (ODS) performance. We systematically investigate synthesis parameters, spatiotemporal yield, and defect characterization, and refines catalytic conditions. Post-acid-treated Ce/Zr-MOF-801-H displays augmented external surface area (189 m 2 g −1 ), and exposed acidic sites while upholding the outstanding intrinsic stability of the Zr-MOF-801 substrate. Under optimal conditions (60 °C, 6 min), Ce/Zr-MOF-801-H completely eliminates dibenzothiophene (1000 ppm S), with a turnover frequency of 39.3 h −1 and catalytic activity of 53.2 mmol g −1 h −1 , far surpassing Zr-UiO-66-H. It maintains a desulfurization rate of 96.6% after five cycles. FTIR spectroscopy, quenching experiments, and ESR spectroscopy reveal that the exposed Ce sites serve dual roles: (1) activating the substrate by reducing the electron density of sulfur atoms and (2) facilitating H 2 O 2 into hydroxyl and superoxide radicals, driving ODS. This strategy not only advances industrial ODS applications but also sheds light on the synthesis of MOF-based host–guest catalysts.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Membranes
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2024
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IF 0
Yue Shen,Gilles Van Eygen,Bin Wu,Chao Wu,Ming-Jie Yin,Yan Zhao,Bart Van der Bruggen,Quan-Fu An
Mineral scaling caused by multivalent metal ions can significantly hinder the long-term operation of nanofiltration membranes. In this study, in-situ interfacial polymerization including a posttreatment by using a citric acid solution was employed in order to mitigate scaling on the membrane surface. Under the optimal conditions (15 min of posttreatment with a 2 M citric acid solution), the membrane water permeance increased from 5.76 ± 0.2 to 15.1 ± 1.8 L⋅m −2 ⋅h −1 ·bar −1 for the pristine and the optimal membrane, respectively. The molecular weight cut-off of the optimal membrane was 399 Da, which allows for the removal of organic micropollutants in groundwater. Furthermore, the resulting membrane showed a Na 2 SO 4 and CaCl 2 rejection of 92.5 ± 1.9 and 11.4 ± 1.3%, respectively. During the anti-scaling tests, the membrane fabricated with this strategy exhibited a minor decline of the water permeance of 33.5% when subjected to the same water recovery process, opposed to 65.8% for the pristine membrane. This proposed fabricating procedure thus provides an effective strategy for retarding membrane scaling in desalination applications.
研究领域:
材料科学
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环境工程
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膜技术
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水处理
✓ 已验证
DOI
MICROPOROUS AND MESOPOROUS MATERIALS
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2013
·
IF 3.365
Sen Lin,Lei Shi,Hongpeng Zhang,Na Zhang,Xianfeng Yi,Anmin Zheng,Xuebing Li
Al-SBA-15 containing plug structures inside straight channels have been hydrothermally synthesized through a one-step synthesis strategy in an environmentally friendly acid-free medium. The effects of steaming, alkali, and acid post-treatments on the structural properties were investigated by powder X-ray diffraction (XRD), nitrogen adsorption–desorption at 77 K, transmission electron microscopy (TEM), scanning electron microscopy (SEM), FT-IR spectrum, 27 Al MAS NMR, and inductively coupled plasma (ICP) analyses. The presence of the plugs can significantly enhance structural stability against steaming or alkali post-treatments. Acid post-treatment can be a very simple and convenient technique for adjusting the textural properties of plug-containing Al-SBA-15, and especially for optimizing the accessibility to active sites. Acid post-treatment at the low temperatures of 313 and 323 K results in the formation of a larger specific surface area (905 m 2 /g) and pore volume (0.94 cm 3 /g) through an “open door” effect in the plugs, without eliminating any of the plugs from the channels. In particular, nearly half of the secondary micropores on the pore walls were preserved. In contrast, raising the acid post-treatment temperature further to 333 and 343 K caused a “closed doors” effect through the blockage of pores in the plugs by the extracted fragments. After loading with nickel, the catalyst exhibited a higher yield of C 10+ olefins in ethylene oligomerization , and more importantly, after steaming and acid post-treatments at higher temperatures, the samples showed shape selectivity for the C 16 olefin.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
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2020
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IF 3.31
Guodong Liu,Yu Liu,Meiyun Zhang,Zhenhua Yang,Patrick Gane
Poly(3,4-ethylenedioxythiophene) (PEDOT), a common constituent material used in the preparation of electrochromic devices (ECDs) when doped with the polymer anion poly(styrenesulfonate) (PSS), can also be used to form an electrode layer. Patterned ECDs may thus be fabricated by conventional spin-coating. Due to high wastage and low productivity in spin coating , the demand for low-cost ECDs is difficult to meet. The alternative use of screen printing, however, results in a major challenge due to difficulty in achieving the necessary continuity of the applied print and of the subsequent film forming uniformity when using standard PEDOT:PSS dispersion alone. The film forming property of PEDOT:PSS is shown here to be improved by dispersing in a water methanol mix to form a novel PEDOT:PSS-solvent compound, which, when combined together with the high boiling solvent dimethyl sulfoxide (DMSO) and a thickening binder solution of polyvinyl alcohol (PVOH), allows screen printing to perform well. The sheet conductivity of the printed PEDOT:PSS compound film is then further increased by studying post-treatment using strong and weak organic acids , illustrated by comparing p-toluenesulfonic acid (tosylic acid (PTSA)) with glacial acetic acid (CH 3 COOH (HOAc)) or oxalic acid (OA), respectively, over a range of concentration. In this way, the optimal processing concentration of acid is accordingly obtained to minimize sheet resistance. Screen printed patterned ECDs, based on the post-treated PEDOT:PSS compound electrochromic and electrode films using the optimal acid concentrations, were printed including electrolyte layers, were evaluated. Performance of lateral versus vertical ECD build architecture in respect to chromatic aberration, working voltage, time response, ion mobility in electrolyte type (gel/solution), absorbance at color-switching, as well as mechanical stability during repeated bending, was assessed. The optima of chromatic aberration and absorbance at color-switching were found to coincide with minimal sheet resistance of the novel PEDOT:PSS compound films. Almost equivalent sheet resistance was obtained with both PTSA and HOAc, each at optimal treatment dosage, showing newly that the weak organic acid post-treatment provides an equivalent effect in comparison with strong organic acid if used at sufficient concentration. Furthermore, the electrochromic performance of the experimentally prepared ECDs was shown to be close to the level obtained from conventional indium-tin oxide (ITO)-based ECDs, and retained stable performance for color-switching after repeated bending of 1 000 times.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
·
IF 5.1
Kai Liang,Jiacheng Xi,Xinghui Hou,Huiyu Yuan,Junyan Cui
Bi 4 MO 8 X-based nanomaterials exhibit promising potential for bioanalytical applications owing to their wide visible light absorption and strong affinity for thiol ligands. However, their photoelectrochemical (PEC) sensing performance is hindered by the low charge separation efficiency. In this study, particulate Bi 4 TaO 8 Cl photoelectrodes were prepared via a drop-coating method, and their charge separation behavior was optimized through trisodium citrate (Na3CA)-assisted post-necking treatment. This treatment facilitated the substitution of Na + ions for Bi 3+ ions, which enhanced oxygen vacancy generation. Additionally, it improved inter-particle connectivity. Benefiting from these modifications, the newly fabricated Na-Bi 4 TaO 8 Cl photoelectrode demonstrated significantly enhanced charge separation and transfer efficiency. Subsequently, a visible-light-driven PEC sensor based on the Na-Bi 4 TaO 8 Cl electrode was developed for cysteine detection, leveraging the specificity of Bi-S bond. Under visible-light irradiation, the PEC sensor exhibited superior PEC detection performance for cysteine, achieving a sensitivity of 360.00nA·cm −2 ·mM −1 and a linear detection range of 0–3.00 mM. The sensor also demonstrates good selectivity and stability. Moreover, it showed satisfactory recoveries in the detection of cysteine in real samples such as egg white. All these prove the practicability of the PEC sensor. This work provides a novel strategy for designing advanced nanomaterials for biological sensing applications.
研究领域:
材料科学
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生物传感器
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
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