Loc Ton-That, Hoang-Dung Pham, T. Huynh, B. Duong, T. Luu, Duy-Khoi Nguyen, Ngoc-An Nguyen, T. Ho, Van-Hien Pham, Van‐Phuc Dinh
In this study, biochar derived from Jackfruit peel (JA) via the pyrolysis at 500 °C for 2 h was used as an adsorbent to remove Methylene Blue (MB) from aqueous solution. Effects of pH, contact time, and initial MB concentration were investigated. Isotherm models, such as Langmuir, Freundlich, Sips, and Dubinin-Radushkevich, were applied to estimate the adsorption in nature. The results indicated that the Sips and Freundlich models gave the best fit with experimental datas. The maximum adsorption capacity of MB calculated from Langmuir was 39.87 mg/g at 306K, pH = 11, and time = 60 min. The E value evaluated from Dubinin-Radushkevich smaller than 8 kJ/mol indicated that the MB adsorption of JA followed a physical process.
{"title":"Adsorption of methylene blue from aqueous solution by biochar prepared from jackfruit peel: isotherm model studies","authors":"Loc Ton-That, Hoang-Dung Pham, T. Huynh, B. Duong, T. Luu, Duy-Khoi Nguyen, Ngoc-An Nguyen, T. Ho, Van-Hien Pham, Van‐Phuc Dinh","doi":"10.51316/jca.2023.001","DOIUrl":"https://doi.org/10.51316/jca.2023.001","url":null,"abstract":"In this study, biochar derived from Jackfruit peel (JA) via the pyrolysis at 500 °C for 2 h was used as an adsorbent to remove Methylene Blue (MB) from aqueous solution. Effects of pH, contact time, and initial MB concentration were investigated. Isotherm models, such as Langmuir, Freundlich, Sips, and Dubinin-Radushkevich, were applied to estimate the adsorption in nature. The results indicated that the Sips and Freundlich models gave the best fit with experimental datas. The maximum adsorption capacity of MB calculated from Langmuir was 39.87 mg/g at 306K, pH = 11, and time = 60 min. The E value evaluated from Dubinin-Radushkevich smaller than 8 kJ/mol indicated that the MB adsorption of JA followed a physical process.","PeriodicalId":23507,"journal":{"name":"Vietnam Journal of Catalysis and Adsorption","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74900765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. M. Nguyen, Ngoc Hong Mai, Nguyen Binh Thai Tran
In this paper, Ag/CuO nanomaterials were successfully prepared by means of a hydrothermal method combined with chemical reduction. The synthesized Ag/CuO nanomaterials were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), surface area analysis (BET). Two factors influencing the synthesis of materials such as time of chemical reduction, concentration of silver nitrate were studied. The results showed that silver crystals were introduced into the CuO nanosheets. The BET specific surface area of the obtained Ag/CuO nanomaterial is 113.47 m2.g-1. This nanomaterial has a high catalytic activity for the decomposition of methyl orange (MO) in the presence of hydrogen peroxide.
{"title":"Synthesis and characteristics of Ag/CuO nanomaterial","authors":"L. M. Nguyen, Ngoc Hong Mai, Nguyen Binh Thai Tran","doi":"10.51316/jca.2023.007","DOIUrl":"https://doi.org/10.51316/jca.2023.007","url":null,"abstract":"In this paper, Ag/CuO nanomaterials were successfully prepared by means of a hydrothermal method combined with chemical reduction. The synthesized Ag/CuO nanomaterials were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), surface area analysis (BET). Two factors influencing the synthesis of materials such as time of chemical reduction, concentration of silver nitrate were studied. The results showed that silver crystals were introduced into the CuO nanosheets. The BET specific surface area of the obtained Ag/CuO nanomaterial is 113.47 m2.g-1. This nanomaterial has a high catalytic activity for the decomposition of methyl orange (MO) in the presence of hydrogen peroxide.","PeriodicalId":23507,"journal":{"name":"Vietnam Journal of Catalysis and Adsorption","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91206257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Truong Xuan Nguyen, T. N. Nguyen, Trung Duc Nguyen, L. Giang, Quang Thuong Tran
Metal-free catalysts are considered a new strategy for environmental application since they do not release any additional hazardous compounds when employed for an extended period. Carbon-based materials and carbon nitride have drawn a lot of interest owing to their physical and optical properties. Herein, we reported a new way to modify carbon nitride with resorcinol-formaldehyde resins, a member of phenolic resins, to enhance their photocatalytic activity. The length of time to polymerize resorcinol-formaldehyde resins was investigated as it had a great impact on the characteristic features as well as the photocatalytic performance of the resulting materials. SEM images revealed that RF resins appeared as nano-fragments and were deposited densely on the surface of carbon nitride. On the other hand, the deposition of RF on the surface of carbon nitride had a great influence on the BET surface area values. For photocatalytic performance, all the modified samples exhibited significantly improved photocatalytic activity towards Methylene Blue (MB). The optimal sample was RF@CN10, which the reflux time was 10 hours. This sample has a more broaden absorption spectrum and a narrower bandgap energy (2.66 eV) than the pure carbon nitride. With regard to photocatalytic activity, this sample could completely degrade MB in the solution within 40 minutes, but it had poor efficiency when visible light was absent. Additionally, the catalyst could work effectively in neutral and alkaline conditions and could be reused for 5 cycles. Finally, the hypothesis for RF-carbon nitride cross-linking and the synergistic effect in the catalyst had been proposed.
{"title":"Resorcinol Formaldehyde Resin-Modified Carbon Nitride as Metal-free Photocatalyst for Water Treatment","authors":"Truong Xuan Nguyen, T. N. Nguyen, Trung Duc Nguyen, L. Giang, Quang Thuong Tran","doi":"10.51316/jca.2023.004","DOIUrl":"https://doi.org/10.51316/jca.2023.004","url":null,"abstract":"Metal-free catalysts are considered a new strategy for environmental application since they do not release any additional hazardous compounds when employed for an extended period. Carbon-based materials and carbon nitride have drawn a lot of interest owing to their physical and optical properties. Herein, we reported a new way to modify carbon nitride with resorcinol-formaldehyde resins, a member of phenolic resins, to enhance their photocatalytic activity. The length of time to polymerize resorcinol-formaldehyde resins was investigated as it had a great impact on the characteristic features as well as the photocatalytic performance of the resulting materials. SEM images revealed that RF resins appeared as nano-fragments and were deposited densely on the surface of carbon nitride. On the other hand, the deposition of RF on the surface of carbon nitride had a great influence on the BET surface area values. For photocatalytic performance, all the modified samples exhibited significantly improved photocatalytic activity towards Methylene Blue (MB). The optimal sample was RF@CN10, which the reflux time was 10 hours. This sample has a more broaden absorption spectrum and a narrower bandgap energy (2.66 eV) than the pure carbon nitride. With regard to photocatalytic activity, this sample could completely degrade MB in the solution within 40 minutes, but it had poor efficiency when visible light was absent. Additionally, the catalyst could work effectively in neutral and alkaline conditions and could be reused for 5 cycles. Finally, the hypothesis for RF-carbon nitride cross-linking and the synergistic effect in the catalyst had been proposed.","PeriodicalId":23507,"journal":{"name":"Vietnam Journal of Catalysis and Adsorption","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89412152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. L. T. Huynh, Nhut Tran Thanh, N. T. T. Ho, Hai Le Viet, Hoang Tam Nguyen Thai
Activated carbon (AC) derived from coconut shells (Tra Bac Company, Vietnam) is a promising candidate material for the capacitance deionization (CDI) technology due to their low-cost, abundance and its high surface area. In our work, the composites AC/MCNTs electrodes were prepared using the polyvinyl alcohol (PVA) and glutaric anhydride (GA) as cross-linking binder. The morphological properties were investigated by scanning electron microscopy (SEM). The electrochemical properties were performed by electrochemical measurements such as: cyclic voltammetry (CV), cyclic charge – discharge (CDC). The composite electrode with 1% CNTs (wt.) showed encouragingly a specific capacitance of 94.0 F/g and a salt absorption capacity of 11.2 mg/g with stable performance.
{"title":"Fabrication of composited electrode based on coconut activated carbon and MCNTs for ionic electrosorption","authors":"N. L. T. Huynh, Nhut Tran Thanh, N. T. T. Ho, Hai Le Viet, Hoang Tam Nguyen Thai","doi":"10.51316/jca.2023.010","DOIUrl":"https://doi.org/10.51316/jca.2023.010","url":null,"abstract":"Activated carbon (AC) derived from coconut shells (Tra Bac Company, Vietnam) is a promising candidate material for the capacitance deionization (CDI) technology due to their low-cost, abundance and its high surface area. In our work, the composites AC/MCNTs electrodes were prepared using the polyvinyl alcohol (PVA) and glutaric anhydride (GA) as cross-linking binder. The morphological properties were investigated by scanning electron microscopy (SEM). The electrochemical properties were performed by electrochemical measurements such as: cyclic voltammetry (CV), cyclic charge – discharge (CDC). The composite electrode with 1% CNTs (wt.) showed encouragingly a specific capacitance of 94.0 F/g and a salt absorption capacity of 11.2 mg/g with stable performance.","PeriodicalId":23507,"journal":{"name":"Vietnam Journal of Catalysis and Adsorption","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75340777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Nguyen, Truong Xuan Nguyen, D. D. La, Dung Trung Dang
Green synthesis is a potential method and increasingly popular for synthesizing nanoparticles. In this study, iron nanomaterial was green sythesized using Cleistocalyx operculatus leaves extract as reducing agent. Morphology and structure of the as-prepared nanomaterial was characterized by scanning microscope, X-ray diffraction analysis methods. The collected product is iron nano material with the morphology is paticles with the diameter is approximatly 100 nm. The iron nanomaterial revealed the high degradation performance toward Methylene Blue (MB) solution. The removal color of MB is determined and confirmed by the visible ultraviolet (UV-Vis) absorption spectroscopy which is proportional to the amount of nanomaterial used and is influenced by pH conditions.
{"title":"Green synthesis of iron nanoparticles using Cleistocalyx operculatus leaves extract and application iron nanoparticles to treat oganic dye Methylene Blue","authors":"L. Nguyen, Truong Xuan Nguyen, D. D. La, Dung Trung Dang","doi":"10.51316/jca.2022.071","DOIUrl":"https://doi.org/10.51316/jca.2022.071","url":null,"abstract":"Green synthesis is a potential method and increasingly popular for synthesizing nanoparticles. In this study, iron nanomaterial was green sythesized using Cleistocalyx operculatus leaves extract as reducing agent. Morphology and structure of the as-prepared nanomaterial was characterized by scanning microscope, X-ray diffraction analysis methods. The collected product is iron nano material with the morphology is paticles with the diameter is approximatly 100 nm. The iron nanomaterial revealed the high degradation performance toward Methylene Blue (MB) solution. The removal color of MB is determined and confirmed by the visible ultraviolet (UV-Vis) absorption spectroscopy which is proportional to the amount of nanomaterial used and is influenced by pH conditions.","PeriodicalId":23507,"journal":{"name":"Vietnam Journal of Catalysis and Adsorption","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73926026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Huong Nguyen Thuy, Ha Nguyen Thi, Noi Nguyen Van, Dong Pham Thanh, Phuong Tran Thi Thu, Lan Nguyen Thi, Hien Tran Thị Thu, Cam Nguyen Thi Dieu, Trung Nguyen Tien
In the research, we successfully synthesized WO3/g-C3N4 Z-scheme heterojunction for photocatalytic degradation of tetracycline. These synthesized materials have been characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR Spectroscopy), to investigate their crystal phase, morphology and chemical compositions. The synthesized WO3/g-C3N4 Z-scheme heterojunction exhibited novel photocatalytic activity for the degradation of Tetracyline even under visible light. This was due to photo-excited electrons in the conduction band of WO3 transferred to the valence band of the g-C3N4 preserving electrons in the conduction band of the g-C3N4 and holes in the valence band of WO3. These electrons and holes would react with oxygen and water to produce oxidative radicals for effective degradation of Tetracycline. The synthesized WO3/g-C3N4 photocatalytically degraded approximately 56 % Tetracycline 10 ppm when it was irradiated by visible light of 32 W for 90 mins.
{"title":"Synthesis of WO3/g-C3N4 Z-scheme heterojunction with novel photocatalytic activity for degradation of residual antibiotics in aquatic environment under visible light","authors":"Huong Nguyen Thuy, Ha Nguyen Thi, Noi Nguyen Van, Dong Pham Thanh, Phuong Tran Thi Thu, Lan Nguyen Thi, Hien Tran Thị Thu, Cam Nguyen Thi Dieu, Trung Nguyen Tien","doi":"10.51316/jca.2022.072","DOIUrl":"https://doi.org/10.51316/jca.2022.072","url":null,"abstract":"In the research, we successfully synthesized WO3/g-C3N4 Z-scheme heterojunction for photocatalytic degradation of tetracycline. These synthesized materials have been characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR Spectroscopy), to investigate their crystal phase, morphology and chemical compositions. The synthesized WO3/g-C3N4 Z-scheme heterojunction exhibited novel photocatalytic activity for the degradation of Tetracyline even under visible light. This was due to photo-excited electrons in the conduction band of WO3 transferred to the valence band of the g-C3N4 preserving electrons in the conduction band of the g-C3N4 and holes in the valence band of WO3. These electrons and holes would react with oxygen and water to produce oxidative radicals for effective degradation of Tetracycline. The synthesized WO3/g-C3N4 photocatalytically degraded approximately 56 % Tetracycline 10 ppm when it was irradiated by visible light of 32 W for 90 mins.","PeriodicalId":23507,"journal":{"name":"Vietnam Journal of Catalysis and Adsorption","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86482721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nga Tran Thi Viet, Truong Tran Ngoc Thien, Luong Nguyen Van, Lien Hoang Nu Thuy, Kim Nguyen Van
The g-C3N4/CdS composite photocatalysts consisting of cadmium sulfide (CdS) and graphitic carbon nitride g-C3N4) with a different mass ratio of CdS were successfully prepared and denoted as CNCS-1:1, CNCS-1:3, CNCS-1:5. The obtained materials were characterized by X-Ray diffraction (XRD), infrared spectra (IR), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The UV-vis DRS results showed that CNCS-1:1, CNCS-1:3 and CNCS-1:5 materials possess bandgap of around 2.31, 2.25 and 2.28 eV, respectively. The photocatalytic activity of the materials was assessed by degradation of methylene blue (MB) under visible light. Among the three materials, CNCS-1:3 exhibited the highest photocatalytic activity. The enhancement of photocatalytic activity of the CNCS-1:3 (or g-C3N4/CdS) composites compared to single components, g-C3N4 and CdS was observed, which can be attributed to the reduction of combination rate of photogenerated electron – hole pairs in the composites.
{"title":"Synthesis and photocatalytic activity of g-C3N4/CdS materials under visible light","authors":"Nga Tran Thi Viet, Truong Tran Ngoc Thien, Luong Nguyen Van, Lien Hoang Nu Thuy, Kim Nguyen Van","doi":"10.51316/jca.2022.067","DOIUrl":"https://doi.org/10.51316/jca.2022.067","url":null,"abstract":"The g-C3N4/CdS composite photocatalysts consisting of cadmium sulfide (CdS) and graphitic carbon nitride g-C3N4) with a different mass ratio of CdS were successfully prepared and denoted as CNCS-1:1, CNCS-1:3, CNCS-1:5. The obtained materials were characterized by X-Ray diffraction (XRD), infrared spectra (IR), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The UV-vis DRS results showed that CNCS-1:1, CNCS-1:3 and CNCS-1:5 materials possess bandgap of around 2.31, 2.25 and 2.28 eV, respectively. The photocatalytic activity of the materials was assessed by degradation of methylene blue (MB) under visible light. Among the three materials, CNCS-1:3 exhibited the highest photocatalytic activity. The enhancement of photocatalytic activity of the CNCS-1:3 (or g-C3N4/CdS) composites compared to single components, g-C3N4 and CdS was observed, which can be attributed to the reduction of combination rate of photogenerated electron – hole pairs in the composites.","PeriodicalId":23507,"journal":{"name":"Vietnam Journal of Catalysis and Adsorption","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91370137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Phuc Van Ban, Quan M. Nguyen, Hien M. Nguyen, Tien Quyet Nguyen, Nga Thi Thanh Truong, Tuan Ngoc Nguyen, A. Nguyen, Hanh Hong Cu, Tuan Dang Thanh, Hung Quang Hung
Methodology for synthesizing of β- and δ-carboline via two steps reaction from 2,3-dibromopyridine and 3,4-dibromopyridine. The intermediate was prepared from the substrate with o-bromophenylboronic acid via site-selective Suzuki-Myaura reaction, then, the final products were obtained by double C-N coupling via the Ulmann reaction of the intermediate with the corresponding amine with copper catalyst.
{"title":"Research on efficient synthetic method of β- and δ-carbolines using a Copper catalyst","authors":"Phuc Van Ban, Quan M. Nguyen, Hien M. Nguyen, Tien Quyet Nguyen, Nga Thi Thanh Truong, Tuan Ngoc Nguyen, A. Nguyen, Hanh Hong Cu, Tuan Dang Thanh, Hung Quang Hung","doi":"10.51316/jca.2022.069","DOIUrl":"https://doi.org/10.51316/jca.2022.069","url":null,"abstract":"Methodology for synthesizing of β- and δ-carboline via two steps reaction from 2,3-dibromopyridine and 3,4-dibromopyridine. The intermediate was prepared from the substrate with o-bromophenylboronic acid via site-selective Suzuki-Myaura reaction, then, the final products were obtained by double C-N coupling via the Ulmann reaction of the intermediate with the corresponding amine with copper catalyst.","PeriodicalId":23507,"journal":{"name":"Vietnam Journal of Catalysis and Adsorption","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85103992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nguyen N. Thanh, Nguyen Thanh Tung, N. Anh, N. Chung, N. Thinh
Nano ZnO/chitosan composite was synthesized using precipitation method. The material was characterized by physicochemical analysis methods including XRD and TEM. The results showed that the spherical and rod-shaped particles were well-dispersed with the average size of 30-40 nm. The ZnO/chitosan composite was applied as an adsorbent to remove congo red from aqueous solution. Equilibrium data fitted well with the Langmuir model. It is assumed that the adsorption process follows the pseudo-second-order kinetics equation. The maximum adsorption capacity was of 281.69 mg/g. This suggested that the material could be a promising adsorbent for colorants removal in aqueous solutions.
{"title":"Removal of congo red dye from aqueous solution using nano ZnO/chitosan composite","authors":"Nguyen N. Thanh, Nguyen Thanh Tung, N. Anh, N. Chung, N. Thinh","doi":"10.51316/jca.2022.070","DOIUrl":"https://doi.org/10.51316/jca.2022.070","url":null,"abstract":"Nano ZnO/chitosan composite was synthesized using precipitation method. The material was characterized by physicochemical analysis methods including XRD and TEM. The results showed that the spherical and rod-shaped particles were well-dispersed with the average size of 30-40 nm. The ZnO/chitosan composite was applied as an adsorbent to remove congo red from aqueous solution. Equilibrium data fitted well with the Langmuir model. It is assumed that the adsorption process follows the pseudo-second-order kinetics equation. The maximum adsorption capacity was of 281.69 mg/g. This suggested that the material could be a promising adsorbent for colorants removal in aqueous solutions.","PeriodicalId":23507,"journal":{"name":"Vietnam Journal of Catalysis and Adsorption","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73358368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kiem Do Van, Dung Nguyen Tien, Nguyen Le Huy, Phuong Bui Thi Lan, Van Hoang Nhu
In this study, nitrogen-doped graphene quantum dots (N-GQDs) were successfully synthesized by hydrothermal method. The morphology and adsorption properties of samples were studied through high resolution transmission electron microscopy (HR-TEM) and UV-Vis absorption spectra. The UV-Vis absorption spectra showed that the typical absorption peaks at 234 nm and 342 nm and 640 nm were characteristic of the N-GQDs materials. HR-TEM image showed that the average size of N-GQDs is about 5 nm. Compared with the absorption peak at 342 nm (strongest absorption peak) of N-GQDs, the absorption peak of N-GQDs·Fe3+ shift towards lower wavelengths at 295 nm, which is due to the complexation between hydroxyl, carboxyl, pyridinic nitrogengroups of the N-GQDs and Fe3+ ions. These results indicated that the N-GQDs materials could have potential application for detecte Fe3+ in the water.
{"title":"Synthesis and ability to detect Fe3+ ion of N-doped Graphene Quantum Dots materials","authors":"Kiem Do Van, Dung Nguyen Tien, Nguyen Le Huy, Phuong Bui Thi Lan, Van Hoang Nhu","doi":"10.51316/jca.2022.073","DOIUrl":"https://doi.org/10.51316/jca.2022.073","url":null,"abstract":"In this study, nitrogen-doped graphene quantum dots (N-GQDs) were successfully synthesized by hydrothermal method. The morphology and adsorption properties of samples were studied through high resolution transmission electron microscopy (HR-TEM) and UV-Vis absorption spectra. The UV-Vis absorption spectra showed that the typical absorption peaks at 234 nm and 342 nm and 640 nm were characteristic of the N-GQDs materials. HR-TEM image showed that the average size of N-GQDs is about 5 nm. Compared with the absorption peak at 342 nm (strongest absorption peak) of N-GQDs, the absorption peak of N-GQDs·Fe3+ shift towards lower wavelengths at 295 nm, which is due to the complexation between hydroxyl, carboxyl, pyridinic nitrogengroups of the N-GQDs and Fe3+ ions. These results indicated that the N-GQDs materials could have potential application for detecte Fe3+ in the water.","PeriodicalId":23507,"journal":{"name":"Vietnam Journal of Catalysis and Adsorption","volume":"82 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91498150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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