Food Analytical Methods
·
2019
·Vol. 13
·期 3
·617-628
·
IF 2.413
Xiu Yi,Luo Ruiping,Han Baoqing,Liu Lu,Wang Hongsu
In this study, a cobalt-based mesoporous carbon material (Co@C) was prepared by self-assembly method and impregnation method, and carboxyl functionalization was carried out to obtain COOH-Co@C. Then, the penicillinase (Pen X) was immobilized on the carrier material by covalent binding. The methylene blue was electropolymerized onto the glassy carbon electrode, and then the immobilized enzyme material was modified onto the modified electrode to prepare a biosensor. After optimization of experimental conditions, the differential pulse method was used to detect penicillin sodium (Pen G) as an antibiotic model. Notably, measurement was performed without any pH redox probe, and a low limit of detection was obtained. The results showed that when the concentration of Pen G was 0.1–10 ng mL −1 , the corresponding current and concentration of the sensor showed a good linear relationship. The linear equation is y = 0.3881x + 17.20 ( r 2 = 0.9974); when the concentration range is 10–100 ng mL −1 , the linear equation is y = 0.1170x + 19.73 ( r 2 = 0.9959). The limit of detection is 0.64 ng mL −1 . The sensor is not only simple to prepare but also has high sensitivity and accurate detection. Finally, using the spike method, the actual sample detection was successfully realized.
研究领域:
分析化学
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食品科学
·
环境监测
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高影响因子
ANALYST
·
2022
·Vol. 147
·期 9
·1995-2007
·
IF 5.227
Rui Han,Fei Wang,Chuanfeng Zhao,Meixing Zhang,Shihai Cui,Jing Yang
Pyrethroids and neonicotinoids are widely used insecticides. However, their residues have unfavorable effects on ecological systems. Magnetic solid phase extraction is a reliable pretreatment method for a better detection of insecticides at low concentrations. In this work, amino- and carboxyl-functionalized magnetic KIT-6 were designed according to the electron-accepting groups of pyrethroid molecules and electron-donating groups with neonicotinoid structures. The characterization of these two materials was conducted using transmission electron microscopy, scanning electron microscopy, nitrogen adsorption–desorption analysis, etc. The aminated composite was applied to the magnetic solid phase extraction of pyrethroid insecticides while the carboxylic one was applied to neonicotinoids, and the adsorption effects were comprehensively compared for the first time. The material dosage, solution pH, and some factors that influenced the recovery were studied and optimized. The adsorption processes of the materials were all spontaneous and exothermic. They also fitted well with pseudo-second order kinetics and Langmuir adsorption isotherms. Both physical (pore function) and chemical (electrostatic interaction) adsorption mechanisms were present in the process. The two nanocomposites were then successfully used to enrich the two kinds of insecticides in environmental water samples. The proposed method has great application potential for insecticide monitoring in complex environmental samples.
研究领域:
环境科学
·
分析化学
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DOI
PubMed
高影响因子
Membranes
·
2023
·Vol. 13
·期 5
·461
·
IF 4.2
Yuxuan Zhao,Hongyan Wang,Xiangyun Liu,Xueping Zong,Jiangzhou Luo,Song Xue
The 6FDA-based network PI has attracted significant attention for gas separation. A facile strategy to tailor the micropore structure within the network PI membrane prepared by the in situ crosslinking method is extremely significant for achieving an advanced gas separation performance. In this work, the 4,4′-diamino-2,2′-biphenyldicarboxylic acid (DCB) or 3,5-diaminobenzoic acid (DABA) comonomer was incorporated into the 6FDA-TAPA network polyimide (PI) precursor via copolymerization. The molar content and the type of carboxylic-functionalized diamine were varied in order to easily tune the resulting network PI precursor structure. Then, these network PIs containing carboxyl groups underwent further decarboxylation crosslinking during the following heat treatment. Properties involving thermal stabilities, solubility,d-spacing, microporosity, and mechanical properties were investigated. Due to the decarboxylation crosslinking, thed-spacing and the BET surface areas of the thermally treated membranes were increased. Moreover, the content of DCB (or DABA) played a key role in determining the overall gas separation performance of the thermally treated membranes. For instance, after the heating treatment at 450 °C, 6FDA-DCB:TAPA (3:2) showed a large increment of about ~532% for CO2gas permeability (~266.6 Barrer) coupled with a decent CO2/N2selectivity~23.6. This study demonstrates that incorporating the carboxyl-containing functional unit into the PI backbone to induce decarboxylation offers a practical approach with which to tailor the micropore structure and corresponding gas transport properties of 6FDA-based network PIs prepared by the in situ crosslinking method.
研究领域:
材料科学
·
化学工程
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PubMed
高影响因子
TETRAHEDRON LETTERS
·
2024
·
IF 1.5
Yuying Bian,Xinhui Song,Yuxin Han,Guang Wang,Hongmei Qiao
In this paper, M-TzDha-COF composed of 4,4′,4″-(1,3,5-triazine-2,4,6-triyl) trianiline (Tz) and 2,5-dihydroxy-1,4-benzenedicarboxaldehyde (Dha) was synthesized by grafting carboxyl groups onto COF framework via the solvent-free esterification. M-TzDha-COF retains the porous structure and has good crystallinity and high thermal stability. M-TzDha-COF exhibits selective adsorption and efficient removal of methylene blue dye with the maximum adsorption capacity of 95 mg·g −1 . M-TzDha-COF can adsorb methylene blue rapidly and maintain high adsorption efficiency after several cyclic applications. The adsorption of methylene blue on M-TzDha-COF is consistent with the pseudo-second-order adsorption kinetic model and Langmuir adsorption model. Adsorption is caused by three interactions: π-π stacking between the triazine group and methylene blue, electrostatic interaction between the carboxyl group and the methylene blue cationic portion, and hydrogen bonding interaction. Fast kinetics, high adsorption capacity and good reusability make carboxyl functionalized COF have great potential in removing methylene blue dye from water.
研究领域:
材料科学
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环境科学
·
化学工程
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高影响因子
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
·
2025
·Vol. 98
·期 9
·
IF 3.8
Xu Ruibo,Xu Xingtao,Alowasheeir Azhar,Yamauchi Yusuke,Jiang Dong
Covalent organic frameworks (COFs) are emerging as promising candidates for high-performance capacitive deionization (CDI) for their ordered pore architectures, tunable functionalization, and abundant active sites. Here, we demonstrate a carboxyl-functionalized COF (TpPa-COOH-COF) for enhanced CDI performance. Comprehensive structural characterizations reveal that the microporous channels of TpPa-COOH-COF, decorated with carboxyl groups exhibit superior electrochemical performance and high salt adsorption capacity (SAC) compared to its non-functionalized counterpart (TpPa-COF). The integration of carboxyl groups within the material enhances the efficient adsorption of Na+, leveraging a combination of electrostatic forces and ligand coordination. In a hybrid CDI (HCDI) system, TpPa-COOH-COF electrode demonstrates remarkable desalination performance, achieving a SAC of 70.49 mg g−1 in a 2,000 mg L−1 NaCl solution under 1.6 V. Furthermore, the pH-dependent ionization behavior of carboxyl within the channel endows the electrode with tunable ion selectivity. Selective Na+ adsorption dominates under weakly acidic to neutral conditions (pH 4 and 7), while K+ selectivity increases under mildly alkaline condition (pH 9). The successful integration of carboxyl with ordered porous architectures provides a strategic pathway for developing next-generation desalination systems with improved efficiency and tunable ion selectivity.
研究领域:
材料科学
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环境工程
·
物理化学
·
纳米科技
·
能源存储
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Ming feng Zou,Xiang ying Chen,Xia jie Lin,Meng ying Chen,Nan Nan Ding,Li-Ye Yang,Xiao-kun Ouyang
In the present study, we synthesized an effective Pb(II) adsorbent from magnetic carboxyl-functionalized attapulgite (McAPT) and sodium alginate (Alg) by simple mechanical agitation at room temperature. The novel McAPT@Alg composite was systematically characterized using a number of instrumental techniques, and the effects of adsorbent dosage, initial concentration of Pb(II), adsorption time, pH, and temperature on the adsorption capacity were investigated by performing batch experiments. The obtained results demonstrated that adsorption equilibrium could be reached within 1.5 h, with the maximum adsorption capacity being 471.20 mg g −1 while the temperature was 297.2 K. The experimental data were suitable for application to the Langmuir isotherm model, and the adsorption kinetics agreed with the pseudo-second-order model. More importantly, a Pb(II) removal efficiency of >70% could be achieved after 6× adsorbent recycling, which demonstrated the excellent potential of McAPT@Alg for removing Pb(II) from contaminated water.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Jianwei Bai,Xiaofei Ma,Huijun Yan,Jiahui Zhu,Kewei Wang,Jun Wang
A solid porous adsorbent with amino and carboxyl is developed successfully via one-pot Friedel-Crafts alkylation reaction. The resulting materials are highly chemically stable and the surface area can be changed by different ratios of initial aromatic monomers . The critical factors effect adsorption performances such as temperature, contact time, ionic strength and pH are studied by using batch adsorption experiments. The adsorption process is fast and can be well simulated with the pseudo-second-order model, yielding a rate constant of 1.31 × 10 −3 min −1 . The sorption isotherms are correlated with the Langmuir isotherms , according to which the highest adsorption amount (46.74 mg g −1 ) is measured at pH 8 under 308 K. According to FT-IR and XPS analysis, uranium is chelated by amino and carboxyl groups , indicating that the addition of tryptophan significantly increases the adsorption capacity . These results provide a new design strategy for the development of novel adsorbents for the recovery of uranium (VI).
研究领域:
环境科学
·
材料化学
·
核废物处理
·
水污染控制
·
功能高分子材料
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 7
·3713-3719
·
IF 3.108
Feng Zhou,Jingjing Zhou,Xuechao Gao,Chunlong Kong,Liang Chen
A postsynthetic covalent strategy involving dual-acyl chloride has been developed to introduce uncoordinated carboxyl groups into amine containing metal–organic frameworks (MOFs). The carboxyl group functionalized MOFs have been characterized by various techniques, including X-ray diffraction patterning, scanning electron microscopy, Fourier transform infrared spectroscopy, nuclear magnetic resonance, thermal gravimetric analysis, and gas adsorption. Results clearly indicated uncoordinated carboxyl groups were successfully grafted to the MIL-101(Cr)–NH2 framework. In addition, most of the amine groups (>80%) were grafted with carboxyl groups, which indicates this method is very effective. The thermal stability and adsorption selectivity of CO2/N2 were substantially enhanced, albeit the BET surface areas and total pore volumes were reduced. These observations could be explained by the effect of elimination of macropores in the framework due to the projecting of new functional groups in pore apertures. Here the successful fabrication of a MOF with uncoordinated carboxyl groups provides the possibility of efficiently modifying other MOFs.
研究领域:
材料化学
·
环境科学
·
多孔材料
·
气体吸附
·
碳捕集
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DOI
高影响因子
ANALYST
·
2015
·Vol. 140
·期 18
·6398-6403
·
IF 4.107
Shuyun Zhu,Xian-En Zhao,Jinmao You,Guobao Xu,Hua Wang
Carboxylic-group-functionalized single-walled carbon nanohorns (SWCNHs-COOH) have been found to possess peroxidase-like activity for the first time. Similar to natural peroxidase, SWCNHs-COOH can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine by H2O2 to produce a blue color solution. Compared with horseradish peroxidase, SWCNHs-COOH exhibit higher activity and stability under harsh reaction conditions. The catalytic activity of SWCNHs-COOH depends on the concentration of H2O2. A colorimetric method for glucose detection was developed by combining the SWCNH-COOH catalytic reaction and the generation of H2O2 by the enzymatic oxidation of glucose with glucose oxidase. Taking into account the advantages of good stability, high biocompatibility in aqueous solutions, being metal-catalyst free, and high purity, SWCNHs-COOH are expected to have potential applications in biotechnology and clinical diagnostics as enzymatic mimics.
研究领域:
纳米生物技术
·
临床诊断
·
分子生物学
·
生物传感器
·
酶学
·
转化医学
✓ 已验证
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Xue Li,Yuan-Yuan Cui,Cheng-Xiong Yang,Xiu-Ping Yan
In this work, the carboxyl functionalized microporous organic network (MON-COOH) was synthesized as an efficient adsorbent to fabricate solid phase extraction (SPE) column for the extraction of p -nitrophenol, p -chlorophenol, 2,6-dichlorophenol and 2,3-dichlorophenol from water samples, followed by their analysis with high performance liquid chromatography (HPLC). The obtained MON-COOH was characterized with solid 13 C nuclear magnetic resonance spectroscopy, fourier transform infrared spectroscopy, thermogravimetric analysis , N 2 adsorption-desorption isotherms, scanning electron microscope and water contact angle experiments. The integrating of carboxyl groups into aromatic MON's networks led to their good enrichment for the studied phenols. The hydrogen binding, π-π and hydrophobic interactions played key roles during the extraction. Effects of adsorbents type, desorption solvent and volume, pH and ionic strength were studied. Under the optimal extraction conditions, the MON-COOH column for SPE coupled with HPLC for the determination of the selected four phenols gave the linear range of 0.5–1000 μg L −1 , the limit of detections (LODs, S/N = 3) of 0.13–0.62 μg L −1 , the limit of quantifications (LOQs, S/N = 10) of 0.43–2.06 μg L −1 , the enhancement factors of 113–216, and the intra-day, inter-day and column-to-column precisions (relative standard deviations, RSDs) of 2.8–6.1, 4.1–8.7 and 6.7–10.3%, respectively. The developed method was successfully applied to the analysis of phenols in wastewater samples with the recoveries of 80.3–99.5%. These results revealed the potential of functional MONs as efficient adsorbents in sample pretreatment.
研究领域:
分析化学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Jun-Hua Han,Yuan-Yuan Cui,Xin-Qiao He,Yan Zhang,Cheng-Xiong Yang
Fabrication of novel coatings continues to be an area of great interest and significance in the development and application of stir bar sorptive extraction (SBSE). In this work, a carboxyl-enriched microporous organic network (MON-2COOH) coated stir bar was designed and fabricated as a novel adsorbent for efficient extraction of four phenylurea herbicides (PUHs) before their determination by high-performance liquid chromatography coupled with photodiode array detector (HPLC-PDA). The MON-2COOH was represented as an effective adsorbent for PUHs due to its large surface area, rigid porous structure, aromatic pore walls and the desired hydrogen bonding sites of introduced carboxyl groups. Variables affecting the SBSE of target analytes were optimized in detail. Under the optimal extraction conditions, favorable correlation coefficients (R 2 > 0.996) in the linear range 0.10–250 μg L −1 , low limits of detection (LODs, S/ N = 3) of 0.025–0.070 μg L −1 and good enrichment factors (46–49) were obtained. Besides, the proposed SBSE-HPLC-PDA method was successfully applied to determine trace PUHs in food and environmental water samples with recoveries in the range of 80.0–104.8% and the precisions (relative standard deviations, RSDs) lower than 9.9% ( n = 3). This work revealed the potential of MONs in SBSE of trace contaminants from environmental samples.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yuanchao Pei,Yaxin Zhang,Jie Ma,Yang Zhao,Zhiyong Li,Huiyong Wang,Jianji Wang,Ran Du
Development of porous adsorption materials tethered with functional groups was favorable to establish a more efficient, stable and broad-spectrum metal ions removal strategy from water. In this work, carboxyl functional poly(ionic liquid)s@MOF composites were prepared through in situ polymerization of ILs monomers inside MOF pores. Their thermophysical property, structure and morphology were characterized by different techniques. These PILs@MOF composites were proposed as universal and efficient adsorbents to remove selected rare earth metal ions (La 3+ , Sm 3+ , Nd 3+ ) and heavy metal ions (Pb 2+ , Cd 2+ ) from water medium. Effect of pH value and composite dosage on the adsorption efficiency were studied in detail. The optimized adsorption efficiency as high as 99.8 % could be found for the selected metal ions by PIL@MIL-101. In addition, the isotherms, kinetics and thermodynamic parameters of the adsorption process were also determined, and these results imply that the Langmuir model and pseudo-second-order model fitted well with the experimental data. Thermodynamic parameters revealed spontaneous and exothermic nature of the adsorption process. A plausible mechanism for the adsorption process was suggested by the electrostatic interaction and coordination between the carboxyl group and metal ions with the aid of FTIR and XPS measurements. Finally, recycling experiments were performed to demonstrate the recyclability and stability of PIL@MOF composites undergoes at least five adsorption–desorption runs. The current research presented a series of poly(ionic liquid)s@MOF composites as a universal adsorption platform that demonstrated great potential for removing metal ions with remarkable efficiency.
研究领域:
环境科学
·
材料科学
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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）