SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Yujuan Li,Guangzhou Qu,Luyu Zhang,Tiecheng Wang,Qiuhong Sun,Dongli Liang,Shibin Hu
Humic acid (HA) was a predominant natural organic matter in ground water and surface waters. The removal of HA from micro-polluted source water using a gas phase surface discharge plasma at different grounding modes was studied, and three kinds of grounding modes (iron wire mesh, aluminized paper, and water) were selected. The experimental results illustrated that approximately 95.3% of HA in water was removed within 30 min’s discharge plasma treatment in the iron wire mesh electrode system, and it was 89.5% and 84.6% in the aluminized paper electrode system and water electrode system, respectively; although the strongest streamer discharge and the highest ozone equivalent concentration were both observed in the iron wire mesh electrode system. The discharge plasma treatment resulted in a relatively more homogeneous surface topography in the HA molecules as analyzed by scanning electron microscope (SEM), especially in the iron wire mesh electrode system and in the aluminized paper electrode system. The decomposition process of HA at different grounding modes was analyzed and compared via the evolution of the UV–Vis spectrum, dissolved organic carbon (DOC), specific ultraviolet absorbance (SUVA) and UV absorption ratios with treatment time. In addition, the HA removal efficacy in this study was comparable with those of some other techniques.
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MATERIALS LETTERS
·
2014
·
IF 2.269
Qingfei Wu,Jing Huang,Hua Li
Porous nanostructured WO 3 coatings were deposited by two routes, solution and suspension plasma spraying. The nanostructural characteristics of the coatings were tunable by adjusting the constituents of the starting liquid precursor and spray parameters. Planar or spherical WO 3 grains with controllable sizes in nano-scale have been fabricated. Complete formation of spherical WO 3 grains was attained during solution plasma spraying. Enhanced heating of the nano-WO 3 particles by augmenting plasma power gave rise to oriented WO 3 grain growth along (0 0 2) plane. The planar WO 3 grains with the dimension of ~50 nm, ~80 nm, and ~700 nm in thickness, width, and length respectively were fabricated by the suspension plasma spraying. The results provide clear insight into potential gas-sensing applications of the porous WO 3 coatings.
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FUEL
·
2025
·
IF 7.5
Jie Gao,Zijun Ran,Jingyu Ran,Xin Huang,Chuan Ma,Yunlin Shao
The catalysts utilized for low-temperature catalytic oxidation of Hg 0 from flue gas typically suffer from issues related to H 2 O and SO 2 poisoning. This study focused on doping modification of La 0.875 Ce 0.125 CoO 3 perovskite with promoters and conducted a thorough investigation on the H 2 O and SO 2 resistance through characterization and DFT methods. Experimental results demonstrated that the LCeCO/30 wt% ZrO 2 possessed optimal H 2 O and SO 2 resistance. Under high sulfur (1500 ppm SO 2 ) and high humidity (10 % H 2 O(g)) conditions, it maintained approximately 91 % Hg 0 removal efficiency after thermal regeneration cycles. Characterization results indicated that ZrO 2 doping facilitated the formation of three-dimensional macroporous structure and protected active Co 3+ sites on the surface. Based on DFT calculations, the H 2 O poisoning is attributed to competitive adsorption between H 2 O(g) and Hg 0 on the active sites. Also, the SO 2 poisoning occurs due to competitive adsorption of SO 2 and the toxicity of sulfates to the surface active sites. Meanwhile, ZrO 2 doping can lower the adsorption energies of H 2 O(g) and SO 2 by modifying their adsorption configuration, thus weakening the competitive adsorption of H 2 O(g) and SO 2 with Hg 0 . Overall, LCeCO/ZrO 2 is a promising Hg 0 removal catalyst with superior H 2 O and SO 2 resistance.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xiaoran Li,Kehui Cen,Jinjin Li,Chu Wang,Dongxia Jia,Dengyu Chen
In this study, cellulose and lignin were subjected to co-pyrolysis for the production of syngas. For the pyrolysis experiments, three influencing factors were selected using a response surface method: pyrolysis temperature (400–800 °C), residence time (5–30 min), and lignin mass percentage (0–100 wt%). At a pyrolysis temperature of 477.4 °C, a residence time of 30 min, and a lignin mass percentage of 50 wt%, the actual syngas yield was 77.2 % higher than the theoretical value for the co-pyrolysis. In addition, the hydrogen volume fraction was improved by up to 24.87 % because of the interaction between cellulose and lignin during their co-pyrolysis (pyrolysis temperature of 800 °C, residence time of 17.5 min, lignin mass percentage of 80.65 wt%). Finally, the hydrogen formation process was simulated, using reactive force field molecular dynamics. The results showed that hydrogen molecules began to appear at a simulation time of 0.479 ns and then gradually increased in number with progressing simulation time. In addition, the hydrogen generation pathways were obtained by this simulation method. This study provides a data foundation for optimizing syngas and hydrogen production from biomass.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dongkun Xiao,Yang Wang,Dongxiang Zhang,Yingmin Liu,Haoran Wang,Yalin Li,Huizhen Wei,Shijie Wang,Minglong Sun,Mojie Sun
Rapid and effective hydrogen sulfide ( H 2 S ) detection is vital to ensure safety in industrial environments, where it is a common toxic gas. This study utilized Zn-based metal-organic frameworks (MOFs) as precursors to prepare hollow nanocage structure-like CuO/ZnO sensors. By optimizing the ratio of CuO to ZnO, the resulting CuO/ZnO nanomaterials demonstrated ultra-high sensitivity and a swift response to low H 2 S concentrations. The experimental results show that, thanks to its unique nanocage structure and abundant active sites on the surface, the sensor responds up to 3423 to 10 ppm H 2 S with a response time of only 10 s. In addition, the sensor exhibits good stability, selectivity and low lower detection limit at a low operating temperature of 115 °C, and the lower limit of detection for H 2 S reaches 100 ppb (3.04). Furthermore, the examination of the gas-sensing mechanism exposed the collaboration of CuO/ZnO nanocages in gas adsorption and electron transportation. Remarkably, the generation of p-n heterostructures greatly enhanced the sensitivity and selectivity towards H 2 S , while providing a model for constructing and producing high-performance and enduring sensors.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 43
·55836-55849
·
IF 0
Kang Lu,Wang Ying,Du Ruihan,Zhang Jinpu,Kang Chunli
In this paper, a modification of g-C 3 N 4 was carried out by combining non-metal doping with the construction of heterojunctions, and a type II heterojunction composite, S/g-C 3 N 4 @β-Bi 2 O 3 , was prepared. The phase structure, morphology, elemental composition, valence band structure, and light absorption performance of the photocatalyst were analyzed using characterization techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflectance spectroscopy (UV–vis DRS). The performance of the composite photocatalyst in the photocatalytic degradation of gaseous toluene, one of the typical volatile organic compounds (VOCs), under simulated solar light was studied. The effects of preparation conditions, toluene concentration, and recycling on the photocatalytic performance of the composite photocatalyst were investigated. The results show that under the optimal preparation conditions, S/g-C 3 N 4 @β-Bi 2 O 3 achieved a degradation efficiency of 74.0% for 5 ppm toluene after 5 h of light irradiation. Although the degradation efficiency decreased to 61.2% after five cycles, it maintained 83% of its initial activity, indicating good stability of the composite photocatalyst. Free radical quenching experiments demonstrated that h + was the main active species in the photocatalytic degradation of toluene, followed by ·O 2 − . Based on all experimental results, the migration law of photo-generated charges was analyzed, and a possible photocatalytic mechanism was proposed. In this study, a new material was obtained for the photocatalytic removal of VOCs by improving the photocatalytic properties of g-C 3 N 4 .
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PubMed
MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Dali Zhuo,Xiaoyu Dong,Linghuan Li,Ronghua Zeng,Chao Tan,Hong Luo,Zhirong Zou
Calcium ion (Ca 2+ ) is one of the important nutrients for humans, excessive and insufficient intake may both cause diseases, so that it is of great importance to analysis of Ca 2+ in our daily life. In this work, a portable gas pressure meter-based method was developed for the detection of Ca 2+ in water samples and calcium gluconate oral liquids. Ca 2+ in solution was extracted and precipitated by the addition of Na 2 C 2 O 4 , CaC 2 O 4 precipitate was formed and then filtered from the complicated matrix through a filter membrane. The filter membrane (containing CaC 2 O 4 precipitate) was then treated by H 2 SO 4 solution, CaC 2 O 4 precipitate was dissolved during this step and H 2 C 2 O 4 was formed. In a sealed bottle-in-bottle reaction device, H 2 C 2 O 4 reacted with acidic KMnO 4 solution to generate CO 2 gas, causing a significant gas pressure increase and it was readout by a hand-held pressure meter. A standard curve with linear range of 1–80 mmol L −1 and a limit of detection of 0.4 mmol L −1 were obtained. This system was subsequently applied to the detection of Ca 2+ in several water samples and oral liquids, recoveries of 92–110 % were obtained for their spiked samples. Only a few reaction bottles and a gas pressure meter were required in this system. It is a low-cost, sensitive, rapid and easy-used analytical method for on-site determination of Ca 2+ .
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PETROLEUM SCIENCE AND TECHNOLOGY
·
2025
·
IF 1.4
Airong Li,Pan Liu,Yulong Zhao,Yikai Zou
The exploration of shale gas has increasingly emerged in recent years. In this work, the ionic liquid (IL) of 1-butyl-3-methylimidazole ferric tetrachloride was firstly used as a chemical additive to improve the dissolution of shale and enhance shale gas desorption. The analyses of total organic carbon (TOC), Fourier transform infrared spectroscopy, X-ray diffractometer, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller measurement were performed. The results revealed that the TOC content was reduced by 66.2% using a concentration of 0.1 mol/L 1-butyl-3-methylimidazole ferric tetrachloride with a solid-liquid ratio of 1:20 at 60 °C and a duration of 48 hr and the dissolution rate of shale was 18.95 wt%. Inorganic minerals within shale were dissolved, and irregular pores were observed, which improve the permeability of shale and the flow of shale gas. Meanwhile, the characterization of residues in the solution presented that the structures of long carbon chain, carbon-sulfur and amines, amides, or heterocyclic within kerogen may be disrupted, which is beneficial for the shale gas desorption. The isothermal adsorption results proved that the adsorption capacity of methane on the kerogen treated was decreased by 53.16%, which inferred that the desorption ability of shale gas can be improved.
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Nano-Micro Letters
·
2024
·Vol. 17
·期 1
·1-17
·
IF 31.6
Zhang Chaoran,Gu Yichuan,Jiang Qu,Sheng Ziyang,Feng Ruohan,Wang Sihong,Zhang Haoyue,Xu Qianqing,Yuan Zijian,Song Fang
Structural reconstruction of electrocatalysts plays a pivotal role in catalytic performances for CO 2 reduction reaction (CO 2 RR), whereas the behavior is by far superficially understood. Here, we report that CO 2 accessibility results in a universal self-adaptive structural reconstruction from Cu 2 O to Cu@Cu x O composites, ending with feeding gas-dependent microstructures and catalytic performances. The CO 2 -rich atmosphere favors reconstruction for CO 2 RR, whereas the CO 2 -deficient one prefers that for hydrogen evolution reaction. With the assistance of spectroscopic analysis and theoretical calculations, we uncover a CO 2 -induced passivation behavior by identifying a reduction-resistant but catalytic active Cu(I)-rich amorphous layer stabilized by *CO intermediates. Additionally, we find extra CO production is indispensable for the robust production of C 2 H 4 . An inverse correlation between durability and FE CO /FE C2H4 is disclosed, suggesting that the self-stabilization process involving the absorption of *CO intermediates on Cu(I) sites is essential for durable electrolysis. Guided by this insight, we design hollow Cu 2 O nanospheres for durable and selective CO 2 RR electrolysis in producing C 2 H 4 . Our work recognizes the previously overlooked passivation reconstruction and self-stabilizing behavior and highlights the critical role of the local atmosphere in modulating reconstruction and catalytic processes.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qiao Zhang,Chunxi Hai,Yanxia Sun,Yunyun Gao,Shengde Dong,Luxiang Ma,Xin He,Qi Xu,Yuan Zhou
How to effectively recover Li + from liquid mineral brines with high Mg 2+ /Li + ratio and low Li + concentration is very significant and important for promoting the carbon peak and carbon neutrality plan valid. Therefore, taking the application merits and formation scheme into consideration, well-crystallized β-Li 2 TiO 3 precursors for obtaining TiO 2 ⋅H 2 O adsorbents were prepared through a classical solid-phase method under the optimized conditions. Interestingly, both Li + desorption and titanium dissolution loss ratio of TiO 2 ⋅H 2 O adsorbents depend on the HCl concentration and delithiation temperature. The Li + escaping routes from LTO precursors to TiO 2 ⋅H 2 O adsorbents is dramatically distinctive with that in the next adsorption/desorption cycles. Accordingly, as-prepared TiO 2 ⋅H 2 O adsorbents owns the high adsorption capacity up to 51.25 mg/g at 60 °C and low Ti-dissolution loss ratio around 1.08 %. The initial adsorption capacity of TiO 2 ⋅H 2 O adsorbents in real original oil–gas field brines containing 100 ppm Li + is 20.14 mg/g. According to the structure–property relationship, formation and working mechanisms of TiO 2 ⋅H 2 O adsorbents was proposed.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Timur Meng,Xianhao Liu,Yuyue Peng,Hongliang Lei,Zhiyi Li,Saowaluk Chaleawlert-umpon,Yutong Dai,Kaige Zhao,Lina Li
The precise control of pore structures in porous organic polymer (POP) materials is of paramount importance in addressing a wide range of challenges associated with gas separation processes. In this study, we present a novel approach to optimize the gas separation performance of POPs through the introduction of fluorine groups and figure out an important factor of reaction decision that whether the AlCl3-catalyzed polymerization is Scholl reaction or Friedel–Crafts alkylation. In the chloroform system, the steric hindrance of function groups could make direct coupling between the benzene rings difficult, which would lead to part solvent knitting (Friedel–Crafts alkylation) instead. The fluorinated polymers show enhanced surface area and pore size characteristics. Notably, the fluorinated polymers exhibited significantly improved adsorption and separation performance for SF6, as evidenced by an ideal adsorbed solution theory selectivity (SF6/N2, v: v = 50:50, 273 K) increase of 75.0, 668.8, and 502.8% compared to the nonfluorinated POPs. These findings highlight the potential of fluorination as a strategy for tailoring the properties of POP materials for advanced gas separation applications.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Dazhi Zheng,Ruijian Zhu,Yuwen Hu,Shiou Liang,Huiying Sun,Zengmei Wang
The emissions and particulate pollutants (PM) from industrialization and other human activities have become a significant threat to human health. Researchers have experimented with various fiber-bonded filters, but there are still relatively few products with good high-temperature resistance. In this paper, a fiber-bonded porous ceramic with high porosity was prepared by vacuum filtration combined with freeze-drying using two homemade mullite fibers with different length-to-diameter ratios as raw materials and mullite sol as binder. When the content of fine fibers is 40 %, the product has a better overall performance, its density is 0.63g/cm 3 , porosity is 74 %, strength is 0.77 MPa, thermal conductivity is 0.153 W m −1 K −1 . When the airflow rate of 2 L/min, the pressure drop is 80 Pa, the filtration efficiency of about 99 %, the QF is 0.08 pa −1 , The mullite fiber-bonded porous ceramics prepared through a simple process exhibit excellent filtration performance, offering a wide range of potential applications.
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