CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zai-Dong Shao,Ting-Ting Hu,J. Paul Chen,Qi-Jun Zhang,Peng Wu,Rui-Sang Liu,Jiang Lu,Xiao-Meng Ren,Yu-Ming Zheng
Gaseous ammonia (NH 3 ), a highly corrosive and toxic pollutant, poses significant risks to human health and the environment. This study addresses the challenge of trace NH 3 removal by synthesizing carboxylic acid-functionalized silica aerogels (CMSA-X) through a simple, cost-effective two-step grafting approach. The fabricated CMSA-4 aerogel exhibited a high -COOH group content (4.13 mmol·g −1 ) and a stable nanoporous structure, enabling reversible and highly selective adsorption for trace gaseous ammonia. It demonstrated exceptional adsorption capacity (3.90 mmol·g - 1 at 0.1 bar and 7.30 mmol·g -1 at 1.0 bar) and outstanding adsorption selectivity (selectivity coefficients of ∼43031 for NH 3 /N 2 and ∼2200 for NH 3 /CO 2 , respectively). The NH 3 -saturated CMSA-4 can be easily regenerated by low temperature treatment (393 K), and maintained 94% adsorption capacity after ten adsorption-desorption cycles. The superior dynamic adsorption capacities of 3.36 mmol·g - 1 under dry condition and 3.28 mmol·g - 1 under humid condition outperformed previously reported adsorbents. Field tests further confirmed its efficacy in removing trace NH 3 (2 ppm), achieving removal rates 1.6-3.8 times higher than commercial alternatives. In-situ diffusion infrared spectroscopy revealed that proton transfer caused OCO - NH 4 + formation is the key adsorption mechanism. This study provides a promising method to develop high-performance adsorbent for efficient trace NH 3 removal in environmental and industrial applications.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2016
·
IF 2.421
Fan-rong Kong,Li-sha Pan,Chen-man Wang,De-la Zhang,Nai Xu
Effects of polycarboxylate (PCE) superplasticizers with different densities of carboxylate groups, functional group contents, molecular weight, and side chain polymerization degrees on the hydration behavior of Portland cement were investigated in this study. The experiments were conducted by using semi-adiabatic calorimeters equipped with a temperature measurement system. The water cement ratio (W/C) was 0.4, and the PCE dosage used was 0.3%. Besides, the Total Organic Carbon (TOC) experiments were taken to further study the delaying mechanism of different PCE on cement hydration. The ability to delay hydration increased in PCEs with high densities of carboxylate groups, short side chains, and high molecular weight and the copolymerization of methyl acrylate (MA) monomers decreased the heat flow peak. Nevertheless, the main hydration temperature peak and the maximum elevated temperature decreased when the density of the carboxylate groups increased. Moreover, PCEs with only a moderate molecular weight had the lowest hydration degree. The main hydration peak decreased but appeared in advance when the amount of MA monomers copolymerized with PCEs was increased; the hydration degree also decreased. PCEs only polymerized by methyl allyl polyethenoxy ether (TPEG400) macromonomer had a hydration degree of 69.46%. Absorption amount results indicate that PCEs affect the hydration of cement paste by absorbing PCEs on the surface of cement particles or encapsulating some cement particles to restrain cement hydration. PCEs grafted with MA hydrolyzed to carboxylic and hydroxyl groups, which can both restrain the hydration of cement paste.
研究领域:
建筑材料学
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化学工程
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Danping Wu,Quan Chen,Min Wu,Peng Zhang,Liping He,Yihui Chen,Bo Pan
The reactivity of pyrogenic carbon has attracted a great deal of research attentions recently. The oxygen-containing structures are rich on the surface of biochars, and involved in accepting and donating electrons during the interactions between biochar and organic contaminants . In this work, the species and content of oxygen-containing functional groups on biochar surface were regulated through chemical modification, and batch sorption/degradation experiments were carried out for rhodamine B (RhB). Based on the comparison of surface functional groups, biochars produced below 200 °C mediated RhB degradation through phenol hydroxyl group, while semiquinone and carboxylic acid groups were the main reaction active sites for biochars produced at higher than 500 °C. Considering that various biochar properties play roles in mediating organics degradation , the strategies in manipulating biochar properties should be carefully considered.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2014
·Vol. 2014
·期 20
·3172-3177
·
IF 2.965
Zhiming Chen,Zhirong Geng,Zhiyang Zhang,Lianbing Ren,Tingxian Tao,Renchun Yang,Zuxiang Guo
Graphical Core–shell magnetic Fe 3 O 4 @C nanoparticles are functionalized with sulfonic and carboxylic acid groups and employed to capture heavy metal ions in aqueous media. The magnetic Fe 3 O 4 @C nanoparticles can be easily separated with an external magnet and possess rapid removal kinetics, high adsorption capacities, and removal efficiencies for Pb 2+ , Hg 2+ , and Cd 2+ ions from aqueous solution. Core–shell magnetic Fe 3 O 4 @C nanoparticles functionalized with sulfonic and carboxylic acid groups were synthesized and employed to capture heavy metal ions in aqueous media. The Fe 3 O 4 cores possess unique magnetic properties for adsorbent separation, and the –SO 3 H and –COOH groups attached to the surface of the carbon shells determine the efficiency of heavy metal ion removal. Batch adsorption experiments showed that Pb 2+ , Hg 2+ , and Cd 2+ ions can be completely and quickly removed by the Fe 3 O 4 @C nanoparticles. The equilibrium was established within 5 min, and the maximum adsorption capacities of the Fe 3 O 4 @C nanoparticles toward Pb 2+ , Hg 2+ , and Cd 2+ ions were 90.7, 83.1, and 39.7 mg/g, respectively. The removal efficiencies were 96.3, 98.1, and 93.8 % for Pb 2+ , Hg 2+ , and Cd 2+ ions, respectively. This work provides a facile and general approach to synthesize magnetic functional nanocomposites for wastewater treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 7
·2537-2549
·
IF 8.262
Yanxiong Pan,Zhi Liu,Weicai Wang,Chao Peng,Kai Shi,Xiangling Ji
A series of macroporous adsorbents based on polyvinyl alcohol–formaldehyde (PVF) sponges was prepared using redox-initiated grafting polymerization of acrylamide (AM) followed by hydrolysis under alkaline conditions. The as-prepared sponges display average pore sizes in the range of 60–90 μm and interconnected pores with a porosity of approximately 90%. Elementary analysis confirmed that the amide groups in AM grafted PVF (PVF-g-GAM) have been rapidly converted into sodium carboxylate and the hydrolysis degree (HD) reaches approximately 65.5% within 6 h. The PVF-g-GAA (hydrolyzed PVF-g-GAM) sponges possess excellent water absorption performance with the ability to reach water absorption equilibrium within a few seconds and a saturated absorption capacity more than 300 g g−1. Importantly, the PVF-g-GAA can be used as adsorbents to remove toxic metal ions, such as Cu2+, Pb2+ and Cd2+, in wastewater efficiently due to the existence of abundant carboxylate groups in the abovementioned network. In single metal ion systems, the sponges could reach adsorption equilibrium within 10 min and the adsorption kinetics fit well with a pseudo-second order kinetic equation. The influence of pH and types of metal ions on the adsorption capacities have also been investigated extensively. PVF-g-GAA-20 displays high adsorption performances with maximum adsorption capacities for Cu2+, Pb2+ and Cd2+ up to 2.50, 3.20 and 3.15 mmol g−1 at pH 5.11, respectively. The equilibrium adsorption isotherm demonstrated that the adsorption equilibrium of the PVF-g-GAA-20 for Cu2+, Pb2+ and Cd2+ ions follows the Langmuir isotherm model very well with maximum adsorption capacities approximately 4.00, 3.97 and 3.34 mmol g−1, respectively. In the binary metal ion coexistence systems, including Cu2+/Pb2+, Cu2+/Cd2+ and Pb2+/Cd2+ mixtures, PVF-g-GAA-20 displayed excellent absorption selectivity for Cu2+ and Pb2+ and the values of and were 13.4 and 7.14, respectively. It can be noted that the adsorption capacities for the abovementioned three metal ions slightly decreased with the variation of ionic strength in the range of 0.01–0.08 M. The sample also exhibited a quick desorption procedure of less than 10 min and excellent reusability of atleast six re-cycles. The adsorption mechanism was also discussed. The PVF-g-GAA sponges are definitely ideal adsorbents for removing/separating toxic metal ions in waste/polluted water bodies.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
·
2025
·
IF 5.9
Zi-Jie Song,Xiao-Fei Wu,Zhi-Ya Zhou,Jing-Jing Zhang,Yan-Yan Pan,Xue Dong,Xuan Pang,Ya-Ping Xie,Juan Sun,Yu Zhang,Jie Qin
A library comprising twenty-four isosteric derivatives of celecoxib substituted with carboxylic acid (labeled as 5a - 5x ), was synthesized and characterized through 1 H NMR, 13 C NMR, HRMS, and elemental analysis. Molecular docking studies revealed that all compounds successfully docked into the binding pocket of COX-2, and the introduction of carboxyl group enhances the interaction between the derivatives and COX-2. The compounds were further evaluated for cell toxicity, and in vitro anti-inflammatory activity. Notably, compound 5l exhibited significant inhibition of both COX-2 and NO release in vitro in comparison to the standard compound, displaying the highest selectivity towards the COX-2 enzyme (SI = 295.9) in comparison to celecoxib (SI = 261.3). 5l also exhibited the most potent anti-inflammatory activity and safety (ulcer index = 5.2) in vivo comparable to celecoxib at the same concentration. Through the molecular modeling and dynamics analysis, it was observed that compound 5l effectively stabilized within the active binding site of COX-2 through strong hydrogen bond interactions, and through the ADMET studies investigated the physiochemical properties and drug-likeliness behavior of compound 5l . In conclusion, compound 5l demonstrated to be a potential selective COX-2 anti-inflammatory candidate with reduced gastrointestinal risks.
研究领域:
药理学
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药物化学
·
炎症研究
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 14
·B679
·
IF 3.662
Fangjing Mo,Qian Han,Jinyi Song,Jingling Wu,Peiyao Ran,Yingzi Fu
A simple "on-off-on" photoelectrochemical (PEC) thrombin (TB) aptasensor has been constructed with the assistant of the elaborately designed matrix prepared by 3,4,9,10-perylene tetracarboxylic acid (PTCA), gold nanoparticles (Au NPs) and cadmium sulfide quantum dots (CdS QDs). PTCA, Au NPs and CdS QDs are used as the photoactive material, photosensitizer, and postpositive photoelectric material respectively. The preparation process of the matrix was characterized via photoelectrochemical and electrochemical technologies. The dynamic concentration monitor of TB via PEC. The results show that the sensitive TB detection can be observed on the proposed "on-off-on" aptasensor with a linear range from 1.0 × 10−6 to 1.0 × 10−14 mol·L−1 and the detection limit of 3.3 fmol·L−1. Through the synergistic effect of the matrix, the obtained signal intensity is 1.6-fold higher than the initial one. The aptasensor also possesses high selectivity to the target TB over other interfering proteins or amino acid, it can be employed to detect TB in human serum samples. This approach reveals a promising avenue for increasing photocurrent efficiently by bringing in postpositive photoelectric material.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Yu Deng,Yigang Ding,Zhong Huang,Ying Yu,Jun He,Yi Zhang
Two novel carboxylic acid based ionic liquids (ILs), benzyltributylammonium myristic acetate ([N 444Bn ][MA]) and benzyltributylammonium dodecanedioic acetate ([N 444Bn ] 2 [DDA]), have been rationally designed and successfully synthesized for the extraction of yttrium (denoted as Y(III)) from a chloride aqueous solution and for the separation of mixed rare earth elements (REEs). Comparison studies of the extraction performances of [N 444Bn ][MA] and [N 444Bn ] 2 [DDA] were carefully investigated under different conditions (e.g., equilibrium time, solution acidity, salting-out agent concentration, and REEs concentration). The results indicated that the extraction efficiency of Y(III) reached 87.18% after 2 min using [N 444Bn ] 2 [DDA], whereas it required 10 min to reach an extraction efficiency of 47.37% using [N 444Bn ][MA], mainly due to the larger electronegativity of the incorporated dicarboxylates in the anions of [N 444Bn ] 2 [DDA], which enhanced its coordination with Y(III) compared to [N 444Bn ][MA]. However, [N 444Bn ][MA] illustrated better selective separation behavior than [N 444Bn ] 2 [DDA] in mixed REEs solutions (including La, Nd, Eu, Ho, Yb and Y), and the selective factors of Yb and La were 16.21 and 3.30, respectively. Furthermore, the ion association mechanism, evolved from the slope analysis and FT-IR results, contributed to avoiding the saponification procedures and resultant saponification wastewater during the extraction process. In addition, the back-extraction experiments indicated that ~97% Y(III) can be stripped from [N 444Bn ] 2 [DDA] and [N 444Bn ][MA] using 1.0 M and 0.4 M HCl, respectively, demonstrating that these ILs can be further used in large-scale applications for the separation and recovery of REEs.
研究领域:
化学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）