JOURNAL OF SOLID STATE CHEMISTRY
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2025
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IF 3.5
Yingxia Ma,Miaoshi Li,Tianze Li,Haijun Yang,Ruilin Zhang,Xiaofei Ye,Wenli Meng,Xiaojun Chai,Cuixia Li
Industrial wastewater containing heavy metal Ag(I) causes irreversible harm to human health through food chain, necessitating effective removal methods. According to hard-soft acids-bases (HSAB) theory, nitrogen (N) and sulfur (S) functional groups form stable chelates with Ag(I). In this study, 2-amino-5-sulfanyl-1,3,4-thiadiazole (AST) with three N and two S groups served as organic ligand, and zinc nitrate hexahydrate provided metal center, novel amorphous metal-organic framework (Zn-AST) rich in N and S groups was synthesized via a one-pot solvothermal method. Batch experiments assessed the Zn-AST adsorption properties for Ag(I) in aqueous solutions. In addition, density-functional theory, frontier orbital theory, and molecular electrostatic surface potential analyses were used to elucidate the synthesis and adsorption mechanisms. The maximum adsorption capacity of Zn-AST for Ag(I) was 2932.91 mg/g. The Zn-AST exhibited good selectivity in the presence of Cu(II), Co(II), Ni(II), and Pb(II) ions, the removal rate for Ag(I) was 98.28 %, which was far higher than the values of other ions (all less than 10 %). The main adsorption mechanisms of Ag(I) by the Zn-AST involved electrostatic interactions, the formation of Ag–S bonds, and chelation between Ag and nitrogen functional groups. This study offers a viable strategy for developing unique adsorbents for Ag(I) removal from wastewater.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
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IF 4.9
Xiaojuan Niu,Lian Xia,Yue Tang,Zhen Wu,Keya Liu,Yuangen Wu
Fumonisin B1 (FB1) is a secondary metabolite produced by Fusariums , which principally contaminates grains and their products, causing pathological and physiological toxicity to humans and animals. Herein, a convenient and rapid colorimetric strategy for FB1 detection was established based on the inhibition effect of FB1 on Ag(I)–3,3′,5,5′-tetramethylbenzidine (TMB) catalytic system. It was found that FB1 can hinder the generation of superoxide anions (O 2 · - ) in the sensing solution, leading to a significant reduction of oxTMB production. Thus, the absorbance and color change of the solution are directly related to the concentration of FB1. Under optimal experimental conditions, there is a satisfactory sensitivity with a limit of detection (LOD) as low as 1.77 ng·mL −1 . Moreover, such colorimetric strategy has outstanding selectivity, and can be used for the detection of FB1 residues in corn and infant rice flour, with a recovery rate of 90.15–109.74 %. Especially, the RGB values corresponding to chromogenic solutions with different FB1 contents can be easily recognized by a smartphone for qualitative and quantitative analysis of FB1. The colorimetric sensing strategy does not require the preparation of nanomaterial, providing a low-cost and promising analysis strategy for FB1 detection.
研究领域:
食品安全
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分析化学
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毒理学
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产品关联
DOI
高影响因子
LANGMUIR
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2020
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IF 3.557
Renxuan Liu,Ying Hou,Shangjun Jiang,Bei Nie
We report a facile approach to fabricate an Ag-embedded fullerene (C60) catalyst by the chemical reduction of the AgNO3 complex encapsulated fullerene microcrystal, which showed an enhanced catalytic reduction of 4-nitrophenol because of the strong absorption and propagation of H2 along the fullerene surface. With the aid of visible-light radiation, photodegradation of orange G dye is achieved through the formation of an electron donor–acceptor dyad between plasmon Ag nanostructures and fullerene molecules, which effectively offsets the “electron–hole” recombination. Neither Ag nanoparticle nor fullerene crystal used in isolation could perform this chemical conversion, implying that the metal–fullerene hybrid structure is imperative for performing the catalytic reaction. The obtained Ag-embedded fullerene crystal is characterized by scanning electron microscopy (SEM), associated energy-dispersive X-ray spectroscopy (EDX) imaging, and X-ray photoelectron spectroscopy (XPS) and demonstrates that the present hybrid materials would add a supplemental member to a family of photocatalysts toward the organic synthesis and wastewater remediation.
研究领域:
材料科学
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环境科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Hong Zeng,Hongli Yang,Yue Tang,Xiaojuan Niu,Yuangen Wu
A facile and simple colorimetric biosensor was first established for paraquat (PQ) detection based on the aptamer-enhanced oxidation process of 3,3′,5,5′-tetramethylbenzidine (TMB) by Ag + . The study confirmed that the interaction of PQ-15 aptamer with Ag + accelerates the electron transfer from the aptamer-Ag + complex to dissolved oxygen, which enhances the release of superoxide anion radicals (O 2 ̇ − ) and facilitates the catalytic oxidation of the chromogenic substrate. PQ-15 aptamer will preferentially bind to PQ molecules, resulting in no further enhancement of the catalytic activity of Ag + . Molecular docking results revealed that the PQ molecules are attached to the stem-loop region of the PQ-15 aptamer through σ-π conjugation interactions. The proposed method is simple that only contains Ag + and corresponding aptamer. The limit of detection (LOD) of the constructed colorimetric biosensor for PQ detection was determined to be 16.5 μg·L -1 , belowing the maximum residue limit in fruits and vegetables set by the EU. Moreover, the colorimetric biosensor showed excellent selectivity and anti-interference properties, which was validated for detecting PQ residues in several typical agricultural and water samples.
研究领域:
生物化学
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环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Xiao-han Pan,Jian-hua Zu,Jing-jie Diao,Yi Xue,Si-yu Liu
The aim of current work was to explore a new material for the fast, efficient and selective recovery of precious metal silver (Ag(I)) from electroplating effluents to alleviate its high consumption and mitigate its environmental pollution. In this study, the sulfydryl-rich covalent organic framework (COF-SH) was prepared by solvothermal method . Its Ag(I) adsorption performance was evaluated by batch adsorption experiments that the effects of initial Ag(I) concentration, ratio of adsorption dosage to solution volume, adsorption time and reacting temperature were studied. The isothermal data fitted well with the Langmuir model and the maximum adsorption capacity at 298 K was up to 609.89 mg/g. The adsorption rate was very fast almost achieving adsorption equilibrium within 16 min. The adsorption rate and adsorption capacity increased with the increase in reaction temperature. The perfect fitting with pseudo-second-order kinetic model indicated the adsorption process was dominated by chemisorption process. Weber–Morris intraparticle diffusion model divided the adsorption process into three stages and temperature had a positive correlation with the first stage, external surface diffusion . The thermodynamic fitting results suggested that the adsorption process was endothermic, disordered and spontaneous. In terms of application, COF-SH achieved highly selective adsorption of Ag(I) in simulated electroplating wastewater with coexistence of multiple metal ions , especially at high acidity (≥1 M HNO 3 ), and the increase in concentration of competing ions had no affects. In addition, 1 M HNO 3 + 0.3 M thiourea (TU) could be used as desorption agent with 100% Ag(I) desorbed from the adsorbed adsorbent COF-SH-Ag.
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
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2012
·Vol. 51
·期 2
·340-346
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IF 3.919
Delong Liu,Hou Chen,Naiyi Ji,Zhi Tan
In this study, we reported the synthesis of polyacrylonitrile (PAN) via living radical polymerization in N, N -dimethylformamide using carbon tetrachloride as initiator, copper(II) chloride (CuCl 2 )/hexamethylenetetramine as catalyst system, and 2,2-azobisisobutyronitrile as a high concentration of thermal radical initiator. The polymerization proceeded in controlled/living manner as indicated by first-order kinetics of the polymerization with respect to the monomer concentration, linear increase of the molecular weight with monomer conversion and narrow polydispersity. Higher polymerization rate and narrower molecular weight distributions were observed with CuCl 2 less than 50 ppm. The rate of polymerization showed a trend of increase along with temperature. The modified PAN containing amidoxime group was used for extraction of Ag(I) ions from aqueous solutions. The adsorption kinetics data indicated that the adsorption process followed pseudo-second-order rate model. The isotherm adsorption process could be described by the Freundlich isotherm model. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013
研究领域:
高分子化学
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环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）