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Kaya N, Carus Özkeser E, Yıldız Uzun Z. Investigating the effectiveness of rice husk-derived low-cost activated carbon in removing environmental pollutants: a study of its characterization. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2024; 26:427-447. [PMID: 37583119 DOI: 10.1080/15226514.2023.2246584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/17/2023]
Abstract
The chemically activated biochar was produced through the pyrolysis of rice husk. Thermal gravimetric and elemental analysis were conducted to characterize the raw rice husk. The activated biochar product underwent evaluation through SEM, BET and, FT-IR analysis. This cost-effective activated carbon was utilized as an adsorbent for the elimination of environmental pollutants. At a temperature of 25 °C, the activated biochar product exhibited an impressive maximum CO2 adsorption capacity of 152 mg/g. This exceptional performance can be attributed to its notable surface area and porosity, measuring at 2,298 m2/g and 0.812 cm3/g, respectively. This product was also utilized to remove methyl red (MR) dye from an aqueous solution. The optimal parameters for the removal of MR were determined as follows: a pH of 6.0, a temperature of 25 °C, an initial MR concentration of 50 mg/L, and an adsorbent dosage of 0.4 g/L. At a duration of 140 min, the system attained its maximum equilibrium adsorption capacity, reaching a value of 62.06 mg/g. Furthermore, the calculated maximum MR removal efficiency stood at an impressive 99.31%. The thermodynamic studies demonstrated that the MR removal process was spontaneous, exothermic, and increased randomness. Kinetic studies suggested that the pseudo-second-order model can fit well.
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Affiliation(s)
- Nihan Kaya
- Department of Chemical Engineering, Ondokuz Mayıs University, Samsun, Turkey
| | | | - Zeynep Yıldız Uzun
- Department of Chemistry and Chemical Processing Technologies, Sinop University, Sinop, Turkey
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A sensitive fluorescent assay based on gold-nanoclusters coated on molecularly imprinted covalent organic frameworks and its application in malachite green detection. Food Chem 2023; 410:135425. [PMID: 36634559 DOI: 10.1016/j.foodchem.2023.135425] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 01/04/2023] [Accepted: 01/05/2023] [Indexed: 01/09/2023]
Abstract
Malachite green (MG), as a parasiticide, is widely used in aquaculture to increase the production of the fishery industry. It poses a great danger to both the food system and the human body. In this study, a one-pot reverse microemulsion polymerization was employed to combine the gold nanoclusters (AuNCs) with molecularly imprinted polymers (MIPs) and covalent organic frameworks (COFs) to synthesize an efficient fluorescent hybrid probe (AuNCs@COFs@MIPs) for selective detection of MG. The specific recognition of AuNCs@COFs@MIPs towards MG triggers the fluorescence quenching of AuNCs. The fluorescent response was linearly related to the concentration over the range of 10-150 nmol/L with a limit of detection of 2.78 nmol/L. In addition, the proposed probe was further applied to fish and water samples. A favorable recovery ranged from 97.34 to 101.51 % toward trace amounts of MG indicating its promising application for detecting residue of veterinary drugs.
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Mulder HA, Cecil TI, Fines C, Pearcy AC, Halquist MS. Advancing the use of molecularly imprinted polymers in bioanalysis: the selective extraction of cotinine in human urine. Bioanalysis 2023; 15:465-477. [PMID: 37254737 PMCID: PMC10300667 DOI: 10.4155/bio-2023-0019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 04/12/2023] [Indexed: 06/01/2023] Open
Abstract
Aim: To characterize a molecularly imprinted polymer via precipitation polymerization for the extraction of cotinine in urine. Methods: The polymer was created via precipitation polymerization. Physical characteristics of the polymer were assessed via scanning electron microscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis. The polymer adsorption capacity was assessed and an solid-phase extraction method from urine by LC-MS/MS was developed. Results: The polymer had small, spherical morphology and little thermal decomposition. The extraction method yielded cotinine recoveries of 77-103% in urine. The molecularly imprinted polymer adsorption capacity for cotinine was 448.2 ± 2.1 μg/mg. Common interferants did not affect cotinine's extraction. Conclusion: The resulting polymer was determined to be specific for cotinine and can be used for the detection of cotinine in urine for clinical samples.
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Affiliation(s)
- Haley A Mulder
- Department of Pharmaceutics, School of Pharmacy, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Thomas I Cecil
- Department of Chemistry, Virginia Commonwealth University, Richmond, VA 23284, USA
| | - Cory Fines
- Department of Pharmaceutics, School of Pharmacy, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Adam C Pearcy
- Department of Pharmaceutics, School of Pharmacy, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Matthew S Halquist
- Department of Pharmaceutics, School of Pharmacy, Virginia Commonwealth University, Richmond, VA 23298, USA
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Malik S, Khan A, Khan H, Rahman G, Ali N, Khan S, Sotomayor MDPT. Biomimetic Electrochemical Sensors Based on Core-Shell Imprinted Polymers for Targeted Sunset Yellow Estimation in Environmental Samples. BIOSENSORS 2023; 13:bios13040429. [PMID: 37185506 PMCID: PMC10136464 DOI: 10.3390/bios13040429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 03/16/2023] [Accepted: 03/23/2023] [Indexed: 05/17/2023]
Abstract
Magnetic molecularly imprinted polymers (MMIPs) contain the predesigned specialized recognition capability that can be chosen to build credible functional materials, that are easy to handle and have a good degree of specificity. Hence, the given piece of work is intended to design a novel electrochemical sensor incorporating magnetite-based molecularly imprinted polymers. The building materials consisted of a cross-linker (EGDMA), reaction-initiator (AIBN), monomer (methylene succinic acid-MSA), and template molecule (Sunset Yellow-SY dye). MMIPs exhibited a diameter of 57 nm with an irregular shape due to the presence of cavities based on SEM analysis. XRD patterns exhibited crystallinity, as well as amorphous peaks that are attributed to polymeric and non-polymeric frameworks of MMIPs. The crystallite size of the MMIPs from XRD analysis was found to be 16.28 nm based on the Debye-Scherrer's equation. Meanwhile, the FTIR bands showed the synthesis of MMIPs using monomer and methylene succinic acid. The sorption data at the optimized operating conditions (pH 2, sorbent dosage 3 mg, time 18 min) showed the highest sorption capacity of 40 mg/g. The obtained data best fitted to the Langmuir sorption isotherm and followed the pseudo-second-order kinetics. The magneto-sensors were applied for ultrasensitive, rapid, and simple sensing of SY dye. The electrochemical experiments were run at the operating condition range of (scan rate 10-50 mV/s, tads 0-120 s, pH 5-9, potential range 1-1.5 V for CV and 1-1.3 V for SWAdASV). The linear range of detection was set to 1.51 × 10-6 M to 1.51 × 10-6 M posing LOD and LOQ values of 8.6242 × 10-5 M and 0.0002874 M, respectively. The regression analysis value for the calibration was found to be 0.950. Additionally, high adsorption efficiency, selectivity, reusability, and strong structural stability of the magneto-sensors showed potential use for SY detection in real samples. These characteristics make MMIPs a viable electrochemical substrate for the detection of chemical contaminants in the environment and in health-related products.
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Affiliation(s)
- Sumeet Malik
- Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa 25120, Pakistan
| | - Adnan Khan
- Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa 25120, Pakistan
| | - Hamayun Khan
- Department of Chemistry, Islamia College Peshawar, Khyber Pakhtunkhwa 25120, Pakistan
| | - Gul Rahman
- Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa 25120, Pakistan
| | - Nauman Ali
- Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa 25120, Pakistan
| | - Sabir Khan
- Chemistry Institute, São Paulo State University (UNESP), Araraquara 14801-900, SP, Brazil
- Department of Natural Sciences, Mathematics and Statistics, Federal Rural University of the Semi-Arid, Mossoró 59625-900, RN, Brazil
- TecMARA, Faculty of Sciences, National University of Engineering, Av. Tupac Amaru 210, Rimac 15333, Lima, Peru
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Yi C, Yan F, Wei X, Wu Y, Wang X, Xu J. Design and characterization of high performance fluorescent probe for neutral red based on fluorescein monoaldol-3-acetyl coumarin. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Khan SB, Li N, Liang J, Xiao C, Sun X, Chen S. Influence of Exposure Period and Angle Alteration on the Flexural Resilience and Mechanical Attributes of Photosensitive Resin. NANOMATERIALS 2022; 12:nano12152566. [PMID: 35893532 PMCID: PMC9332362 DOI: 10.3390/nano12152566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 07/21/2022] [Accepted: 07/21/2022] [Indexed: 11/16/2022]
Abstract
Despite the large number of studies addressing the effect of acrylic resin polymerization concerning flexural properties, limited research has been conducted on the manufacturing impact on a polymer’s mechanical properties. Photosensitive resinous materials are used in various engineering applications where they may be exposed to multiple detrimental environments during their lifetime. Therefore, there is a need to understand the impact of an environment on the service life of resins. Thus, flexural tests were conducted to study the effects of exposure time and angle on the flexural strength of resins. Herein, the main objective was to explore the strength, stability, and flexural durability of photosensitive resin (EPIC-2000ST) fabricated at different exposure times (E) and angle deviation varying from 0° to 85° with a 5° increment. The samples in circular rings were manufactured and divided into five groups according to their exposure time (E): 10 s, 20 s, 30 s, 40 s, and 50 s. In each exposure time, we designed rings via SolidWorks software and experimentally fabricated at different oblique angles (OA) varying from 0° to 85° with a 5° increment during each fabrication, i.e., OA = 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, and 85°. Flexural strength was evaluated using a three-point bending test. Optical electron microscopy was used to examines the samples’ exterior, interior, and ruptured surfaces. Our experimental analysis shows that flexural strength was significantly enhanced by increasing exposure time and at higher oblique angles. However, at lower angles and less exposure time, mechanical flexural resilience declines.
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Affiliation(s)
- Sadaf Bashir Khan
- Dongguan University of Technology, Dongguan 523808, China; (S.B.K.); (N.L.); (C.X.)
- School of Art and Design, Guangzhou Panyu Polytechnic, Guangzhou 511483, China
- School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
- Dongguan Institute of Science and Technology Innovation, Dongguan University of Technology, Dongguan 523808, China;
| | - Nan Li
- Dongguan University of Technology, Dongguan 523808, China; (S.B.K.); (N.L.); (C.X.)
- Dongguan Institute of Science and Technology Innovation, Dongguan University of Technology, Dongguan 523808, China;
| | - Jiahua Liang
- Dongguan Institute of Science and Technology Innovation, Dongguan University of Technology, Dongguan 523808, China;
| | - Chuang Xiao
- Dongguan University of Technology, Dongguan 523808, China; (S.B.K.); (N.L.); (C.X.)
- Dongguan Institute of Science and Technology Innovation, Dongguan University of Technology, Dongguan 523808, China;
| | - Xiaohong Sun
- School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
- Correspondence: (X.S.); (S.C.)
| | - Shenggui Chen
- Dongguan University of Technology, Dongguan 523808, China; (S.B.K.); (N.L.); (C.X.)
- School of Art and Design, Guangzhou Panyu Polytechnic, Guangzhou 511483, China
- Dongguan Institute of Science and Technology Innovation, Dongguan University of Technology, Dongguan 523808, China;
- Correspondence: (X.S.); (S.C.)
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Cheng S, Tang D, Zhang Y, Xu L, Liu K, Huang K, Yin Z. Specific and Sensitive Detection of Tartrazine on the Electrochemical Interface of a Molecularly Imprinted Polydopamine-Coated PtCo Nanoalloy on Graphene Oxide. BIOSENSORS 2022; 12:bios12050326. [PMID: 35624626 PMCID: PMC9138349 DOI: 10.3390/bios12050326] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Revised: 05/06/2022] [Accepted: 05/09/2022] [Indexed: 12/15/2022]
Abstract
A novel electrochemical sensor designed to recognize and detect tartrazine (TZ) was constructed based on a molecularly imprinted polydopamine (MIPDA)-coated nanocomposite of platinum cobalt (PtCo) nanoalloy-functionalized graphene oxide (GO). The nanocomposites were characterized and the TZ electrochemical detection performance of the sensor and various reference electrodes was investigated. Interestingly, the synergistic effect of the strong electrocatalytic activity of the PtCo nanoalloy-decorated GO and the high TZ recognition ability of the imprinted cavities of the MIPDA coating resulted in a large and specific response to TZ. Under the optimized conditions, the sensor displayed linear response ranges of 0.003–0.180 and 0.180–3.950 µM, and its detection limit was 1.1 nM (S/N = 3). The electrochemical sensor displayed high anti-interference ability, good stability, and adequate reproducibility, and was successfully used to detect TZ in spiked food samples. Comparison of important indexes of this sensor with those of previous electrochemical sensors for TZ revealed that this sensor showed improved performance. This surface-imprinted sensor provides an ultrasensitive, highly specific, effective, and low-cost method for TZ determination in foodstuffs.
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Affiliation(s)
- Shuwen Cheng
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, China; (S.C.); (D.T.); (Y.Z.); (L.X.)
| | - Danyao Tang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, China; (S.C.); (D.T.); (Y.Z.); (L.X.)
| | - Yi Zhang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, China; (S.C.); (D.T.); (Y.Z.); (L.X.)
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Libin Xu
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, China; (S.C.); (D.T.); (Y.Z.); (L.X.)
| | - Kunping Liu
- Key Laboratory of Medicinal and Edible Plants Resources Development of Sichuan Education Department, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu 610106, China;
| | - Kejing Huang
- China Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Key Laboratory of Guangxi Colleges and Universities for Food Safety and Pharmaceutical Analytical Chemistry, School of Chemistry and Chemical and Engineering, Guangxi University for Nationalities, Nanning 530008, China
- Correspondence: (K.H.); (Z.Y.)
| | - Zhengzhi Yin
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, China; (S.C.); (D.T.); (Y.Z.); (L.X.)
- Correspondence: (K.H.); (Z.Y.)
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Experimental Analysis of the Effect of Wear Factors on Guide Vane of Hydraulic Turbine. MACHINES 2022. [DOI: 10.3390/machines10040264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this paper, in order to study the wear of the guide vane of the hydraulic turbine, a test bench was built according to the actual internal flow of the hydraulic turbine of the power station. The value of the wear of the surface of the guide vane after polishing was reduced by 18.1 μm compared with that before polishing of P = 30.9 MW and by 12.5 μm at P = 42.8 MW. In order to reduce the influence of sediment wear on the guide vane, a 0.3 mm thick tungsten carbide coating was sprayed on its surface, and the wear of the guide vane after spraying tungsten carbide was obtained. The wear of the guide vane was reduced by about a factor of three to four times compared with that before spraying. In addition, according to the pH value of 6.73 of the river where the power station is located, the change of dissolved oxygen in the water body will affect the wear of the metal material on the surface of the guide vane, and the dissolved oxygen varies with the change of the water body temperature, so we simulated the temperature of the water body in the flood and the dry period of the power station, and got the wear amount of the polished guide vane in the flood period under the two working conditions of 28.1 μm and 47.3 μm, respectively. The wear amounts of the guide vane in the dry period were 25.2 μm and 43.9 μm, respectively. In addition, the service life of the guide vane before and after polishing and after tungsten carbide spraying was estimated based on the wear data obtained from the test, which provides a basis for power plant maintenance.
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