Journal of Water Process Engineering
·
2025
·
IF 6.7
Longjiao Lv,Huihao Luo,Guocheng Zhu
Metal-phenolic networks, despite their good ammonia nitrogen adsorption properties, have suffered from poor acid resistance and high oxidability in the past thus leading to ineffective treatment and the possible conversion of ammonia nitrogen into nitrate nitrogen. Research on the adsorption of ammonia nitrogen by titanium tannate (Ti-TA), which exhibits good resistance to ammonia nitrogen oxidation, is still unclear. A batch experiment was conducted to investigate the structural characteristics of Ti-TA, as well as its adsorption behaviors. Among them, advanced technologies such as Scanning Electron Microscopy, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller, X-ray diffraction, and X-ray photoelectron spectroscopy, were used for this investigation. The results showed that Ti-TA, prepared with a molar ratio of tannic acid to tetrabutyl titanate of 1:5 at a solution pH of 7, was able to form a rough surface and a microporous structure with a specific surface area up to 356.9 m 2 /g. The parameters, affecting the adsorption results, included pH and adsorbent dose, where lower adsorbent doses resulted in higher adsorption capacities, reaching up to 4.175 mg/g, and neutral to weakly acidic conditions were conducive to the adsorption process. For example, when the initial NH 4 + -N concentration was 28.45 mg/L, and the ratio of tannic acid to Ti was 1.5, the removal rate of ammonia nitrogen can exceed 95.78 % within a pH range of 6–7. The primary mechanisms underlying physicochemical adsorption involve electrostatic interaction between oxygen ions and NH 4 + -N, as well as hydrogen bonding. The adsorption process occurred spontaneously, following Pseudo-second-order kinetics and adhering to the Freundlich isotherm model, with a relatively low adsorption index (1/ n < 0.5). For the first time, the findings of this study reveal the adsorption behaviors of Ti-TA and propose optimal preparation conditions, underscoring its significant potential for applications in nitrogen pollution treatment.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Renquan Guan,Xueying Cheng,Weilong Che,Yunning Chen,Zhengkai Wu,Qingkun Shang
The efficient adsorption and activation of nitrogen by photocatalysts, as well as the rapid transport and separation of charge carriers, are key factors affecting the efficiency of photocatalytic ammonia synthesis. This article achieves simultaneous regulation of surface hydrophobicity and carrier transport of defective TiO2 (Vo-TiO2) based on seven bipyridine derivatives with different substituent types and positions. Among the seven prepared composite photocatalysts, Vo-TiO2 modified with 2,2-bipyridyl-6,6-dicarboxylic acid (6-dcbpy-Vo-TiO2) has a photocatalytic activity of 768 μmol g–1 h–1 for ammonia synthesis. By examining the hydrophobicity, absorbance, structural characteristics, defect changes, photoelectrochemical characteristics, etc. of the seven composite photocatalysts obtained and combining theoretical calculations, the influence mechanism of different substituent types and positions of bipyridine derivatives on the photocatalytic performance of Vo-TiO2 for synthetic ammonia was revealed. This work provides an effective reference for the application of bipyridine derivatives on the photocatalytic nitrogen fixation for ammonia synthesis.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ling Peng,Tao Yin,Zhiyong Song,Shanbai Xiong,Ru Liu,Juan You,Qiling Huang
Ammonia nitrogen is a major stressor that negatively affects the welfare of fish during transportation, leading to considerable economic losses. However, there is a lack of effective materials to adsorb ammonia nitrogen in water during the transportation. In this study, we prepared a biochar microsphere, chitosan loaded magnesium biochar microsphere (CS-Mg-SB-M), which showed the superior ammonia–nitrogen adsorption efficiency and reusability compared to the materials prepared with either magnesium impregnation or chitosan modification alone. The removal rate of ammonia nitrogen reached 83.41 % in water containing 50 mg L −1 ammonia nitrogen. The Pseudo-second-order kinetics and Langmuir isotherm models fitted the adsorption process well, suggesting that chemical and monolayer adsorption play a dominant role in ammonia nitrogen adsorbed by CS-Mg-SB-M. The adsorption mechanism of ammonia nitrogen removal by CS-Mg-SB-M involved the synergistic effects of physical absorption (colossal surface area and pore size) and chemical absorption (including coordination bonds, hydrogen bonds, and ionic bonds) according to results of SEM, XRD, FTIR and molecular dynamic simulation. In practical applications, CS-Mg-SB-M demonstrated 33–53 % ammonia nitrogen absorption efficiency, elevating survival rates to 40–60 % alongside measurable enhancements in muscle quality (e.g., cellular structure, drip loss, whiteness, brightness, and redness) of fish after 24 h of transporting in high-density and individual packing modes. This study represents the first application of feasible material to remove ammonia nitrogen in the live fish transportation system, concurrently enhancing survival rate and muscle quality.
研究领域:
环境科学
·
水产养殖
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材料科学
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DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Yijie Wang,Zhixin Chen,Liming Hu
Specific surface area is an important property of porous materials and a crucial index in multiple disciplines, which is mainly measured using nitrogen isotherms and the Brunauer–Emmett-Teller (BET) equation. The BET surface area is remarkably higher than the geometric surface area, which is defined as the surface area of the crystal geometry structure. However, many studies directly use the BET surface area as the geometric surface area. We proposed a simple, general, and accurate method that only needs the nitrogen adsorption isotherm as the input to calculate the geometric surface area of mesoporous materials. The proposed method considers the adsorptive potential influences and the physical state of adsorbed nitrogen in estimating the surface area. We utilized 18 isotherms generated by molecular simulations and actual experiments to cover a wide range of materials, including minerals, catalysts, and carbon-based tubes, and validate the effectiveness of the proposed method. Our results showed that the surface area determined by the proposed method is almost identical to the referenced geometric area. The surface area obtained by the proposed method can be typically considered a geometric surface area.
研究领域:
材料科学
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物理化学
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DOI
高影响因子
FUEL
·
2019
·
IF 5.128
Xiao Zhu,Liqiang Zhang,Mengze Zhang,Chunyuan Ma
Due to high adsorption capacity, NO 2 adsorption using activated carbon has become a potential denitration technology. A correlation between N-doping and NO 2 adsorption process on activated carbon is pointed out by previous studies but lacks a clear explanation. The main objective of this work is to clarify the influencing mechanism of N-doping on NO 2 adsorption and reduction over activated carbon. N-doped activated carbons were synthesized by melamine impregnation followed by calcination and tested as NO 2 adsorbents. Experimental results showed that AC600 with highest N content possessed highest NO 2 adsorption capacity and lowest NO release percentage. NO 2 adsorption on activated carbon is a complex process, including NO 2 adsorption, NO 2 reduction to NO, and NO release. Density functional theory calculations results showed that N-doping affected all steps mentioned above. Firstly, N-doping increased NO 2 physisorption energies, meaning that NO 2 was easier to be adsorbed. Thus, NO 2 adsorption capacities increased with the increase of N content experimentally. Secondly, N-doping increased the energy barrier of the rate-determining step of NO 2 reduction. Thus, the reduction of NO 2 to NO was harder. Thirdly, N-doping increased NO desorption energies, implying that the release of generated NO was harder. The inhibition of NO 2 reduction and NO desorption results in the decrease of NO release percentage due to N-doping jointly. This work elucidates the influencing mechanism of N-doping on NO 2 adsorption and NO 2 reduction on theoretical level, which fills up the research gap and guides the design of activated carbon for efficient NO 2 adsorption.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Aijuan Zhou,Liangxia Zhu,Yuting Chen,Jingwen Wang,Yong Liu
Carbon materials (CMs) have emerged as cost-effective adsorbents with significant potential for environmental remediation, yet their limited adsorption performance for ammonia nitrogen (NH 4 + -N) restricts their application in water purification. Herein, persulfate (PS)-modified carbon nanotubes (MCNTs) were synthesized to enhance NH 4 + -N adsorption from aqueous solutions. The MCNTs showed a well-developed mesoporous structure, higher graphitization degree, and more carbonyl (C=O) groups than pristine carbon nanotubes (CNTs). These structural modifications resulted in a remarkable adsorption performance, achieving both rapid adsorption equilibrium (≤3 min) and a 2- to 3-fold increase in adsorption capacity (compared to pristine CNTs). The adsorption rate constant of MCNTs was 2.58 mg/(g∗min) and the maximum adsorption capacity reached 15.49 mg/g. Mechanistic studies revealed that the enhanced mesoporous ratio of MCNTs significantly accelerated adsorption kinetics, whereas high graphitization degree and elevated C=O content contributed to their superior adsorption capacity and rate. Additionally, saturated MCNTs were effectively regenerated using a sodium hydroxide solution and maintained stable adsorption performance after 5-cycles. This modification strategy demonstrated excellent universal applicability across various CMs. To demonstrate practical applicability, the modified CMs (MCMs) were loaded on an ultrafiltration membrane and employed in a continuous flow adsorption system for treating aquaculture wastewater. The system reduced the NH 4 + -N concentration in the effluent to below 0.3 mg/L within 80 min. This work not only provides a novel class of high-performance MCMs for NH 4 + -N removal from wastewater but also elucidates the critical role of CMs' structure properties in governing adsorption performance.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 31
·12296-12307
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IF 8.262
Qin Wang,Qi Zhao,Yiguo Su,Geng Zhang,Guangran Xu,Yingjun Li,Baocang Liu,Dafang Zheng,Jun Zhang
Hierarchical carbon and nitrogen adsorbed PtNiCo nanocomposites with different morphologies and facets were successfully synthesized via a solvothermal method and showed high electrochemical activity and long-term stability towards the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR). Electrochemical results indicated that the (220) facet-terminated PtNiCo@C–N nanocubes manifest superior electro-catalytic activity compared to other morphologies and facets as well as the commercial state-of-the-art Pt/C catalyst (20%). The surface carbon and nitrogen atoms, multiple active surface sites, and synergistic electronic effects of various elements contribute to the high electro-catalytic performance of the electrocatalysts. It is worth mentioning that the carbon and nitrogen atoms were simultaneously adsorbed onto the surface of the catalysts, which can provide more multiple active sites for these nanocomposites. In order to demonstrate this result, a solvent ligand exchange method was explored to demonstrate that these multiple active sites on the surface of the catalysts can be exchanged into n-hexane solution, and thus the catalytic activity dramatically decreased. The present work highlights the carbon and nitrogen adsorbed PtNiCo@C–N nanocomposites as highly active catalysts for polymer electrolyte membrane fuel cells (PEMFCs).
研究领域:
材料科学
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电化学
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燃料电池
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DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
Ziqiang Wang,Xian Zhang,Zechuan Dai,Wenjing Tian,Peng Wang,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Electrochemical synthesis of ammonia is regarded as an appealing substitute to the Haber-Bosch method owing to its mild condition and reduced energy consumption, while its efficiency still needs further optimization and exploration. Here, bimetallic mesoporous RuAu film is grown on Ni foam (mRuAu/NF) by micelle-assisted electrodeposition . The bimetallic component can strengthen the nitrogen adsorption on the catalyst, and the mesoporous structure provides abundant active sites and facilitated transfer channels for the adsorption and activation of nitrogen. Thus, mRuAu/NF possesses excellent activity and efficiency in 0.1 M Na 2 SO 4 (NH 3 yield: 27.98 μgh/mg cat. ; Faraday efficiency: 19.82%). This research presents a general synthetic method for the preparation of self-supported mesoporous alloy film, which makes a great contribution to nitrogen reduction reaction.
研究领域:
电化学
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催化
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材料科学
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2019
·Vol. 92
·期 1
·134-145
·
IF 1.986
Xia Lijian,Yao Binbin,Shi Hao,Shi Zhekun,Wang Wenpin,Kan Ze
In this paper, we report the fundamental method for controlling monodispersed silica nanoparticles size ranged from 10 to ~135 nm assisted by lysine or lysine hydrochloride, during which the seed regrowth technique was utilized. The synthesis was prepared in the water-base system, which was environment friendly and convenient. According to our research, the influence factors of co-solvent system, molar content of additional TEOS, and molar ratio composition of additional TEOS/seeds were confirmed. The final morphology and size of silica nanoparticles can be tuned by changing the amount of additional TEOS and the seeds size. To guarantee the monodispersity of final particles. In the regrowth process, cyclohexane used as the co-solvent floated on the surface of water to block additional TEOS contact with water directly, and made the silicate intermedium consumable for the growth of the parent particles immediately, while not forming new nucleation. In such a condition, to lower the cost and prepare mass production, the lysine was replaced by lysine hydrochloride, meanwhile, triethylamine was introduced to neutralize the hydrochloride. It should be noted that as the particle size increased to be more than 100 nm, when usinglysine hydrochloride and triethylamine, the types of nitrogen adsorption–desorption isotherms changed from H1 to H3; in contrast, the isotherms of the particles were changed from H2 to H1 when catalyzed by lysine.
研究领域:
材料科学
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纳米技术
·
化学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Kaihao Mo,Peng Cui,Dongni Liu,Cailan Chen,Hanyu Zhang,Minmeng Tang,Peiwen Wu,Yan Huang,Haiyan Ji,Wenshuai Zhu
In extraction processes, the low mass transfer efficiency of conventional ionic liquids is a refractory problem. Herein, a porous ionic liquid (PIL), β-CD-900-PIL, was innovatively constructed by combining a porous carbon material (β-CD-900) derived from β-cyclodextrin polymer with imidazole bis-trifluoromethylsulfonylimide ionic liquid ([C12mim][NTf2]). The N2 sorption isotherm and CO2 adsorption confirmed the porosity of β-CD-900 and the PIL. With the dispersion amount of β-CD-900 as 20 wt%, the extraction efficiency of naphthalene by β-CD-900-PIL reached 66.6%, which was 24% higher than that of the ionic liquid. After three extractions, the naphthalene content decreased from 500 mg L−1 to 5 mg L−1. The high extraction efficiency was attributed to the high porosity and abundant π–π and C–H⋯π interactions between PILs and naphthalene. The more than 99% extraction performance, low viscosity and low preparation cost make β-CD-900-PIL an ideal extractant for polycyclic aromatic hydrocarbons in the petrochemical industry.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zhixun Wei,Yang Li,Fei Chen,Linghua Kong,Chunhong Shi,Congju Li
In this study, a stepped-pore adsorbent was synthesized via a green in-situ method using low-cost iron ore tailings (IOT) as the silicon source. The formation mechanism was elucidated through comprehensive characterization of the material’s phase composition, microstructure, pore properties, and surface functional groups. The effects of roasting temperature, initial ammonia concentration, pH, and coexisting cations on adsorption efficiency were systematically investigated. Kinetic, isotherm, and thermodynamic analyses revealed a combined physisorption and chemisorption mechanism, with a maximum adsorption capacity of 28.72 mg/g. The process was determined to be spontaneous and entropy-driven. The material retained significant adsorption capacity after regeneration and in real wastewater tests. The adsorption mechanism primarily involved electrostatic attraction, hydrogen bonding, and cation exchange. The SI-6 adsorbent demonstrates high cost-effectiveness, excellent environmental compatibility, and strong adsorption performance, showing great potential for environmental remediation and sustainable resource utilization.
研究领域:
环境科学
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材料科学
·
水处理
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资源可持续利用
·
吸附技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Jing-Chuan Song,Zhong-Yuan Lu,Zhao-Yan Sun
3-Aminophenol/formaldehyde (AF) resin colloidal spheres with narrow size distribution and high nitrogen content are synthesized in the presence of urea. The obtained particles that indicated by transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM) are spherical morphology and uniform. It can be further carbonized into carbon spheres preserving high nitrogen percent. The particle size is tunable from 300 nm to 850 nm by appropriately varying the concentration of precursor or water/ethanol volume ratio. Even using the water as an only solvent, we can also obtain spherical particles with different size. Typically, the nitrogen percent in the obtained polymer and carbon particles is as high as 10.39 wt% and 8.95 wt%, respectively. The typical surface area of resulted carbon particles obtained from nitrogen adsorption measurement is 459 m 2 g −1 . X-ray diffraction demonstrates the obtained carbon spheres are amorphous , which are expected to have practical application in the field of energy devices. The method can be considered as a low cost and facile method for mass production.
研究领域:
材料科学
·
化学工程
·
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）