U. León-Silva, M. E. Nicho, L. Cajero‐Sotelo, C. Castro‐Guerrero, Jesús Escobedo‐Alatorre, M. R. Díaz‐Guillén
An alternative technique is presented for the corrosion protection of the A36 structural steel (A36SS) in acid medium (H2SO4) using silica obtained from canary seed husk (CSH). The silica was obtained in a solid amorphous state with a particle size of 10–22 nm. The anticorrosive properties of nanosilica (NS) were studied using potentiodynamic polarization (PDP), linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS). Before carrying out the corrosion tests, the A36SS was subjected to a treatment with NaOH solution without and with the presence of NS. The A36SS treated with NS presented the lowest current density values and the noblest corrosion potential values, indicating that the corrosion rate decreased. The surface morphological study of the tested systems using SEM/EDS showed that the NS‐treated A36SS had a more efficient physical barrier against corrosive species.
{"title":"Nanosilica from canary seed husk for corrosion protection of structural steel","authors":"U. León-Silva, M. E. Nicho, L. Cajero‐Sotelo, C. Castro‐Guerrero, Jesús Escobedo‐Alatorre, M. R. Díaz‐Guillén","doi":"10.1002/vjch.202300264","DOIUrl":"https://doi.org/10.1002/vjch.202300264","url":null,"abstract":"An alternative technique is presented for the corrosion protection of the A36 structural steel (A36SS) in acid medium (H2SO4) using silica obtained from canary seed husk (CSH). The silica was obtained in a solid amorphous state with a particle size of 10–22 nm. The anticorrosive properties of nanosilica (NS) were studied using potentiodynamic polarization (PDP), linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS). Before carrying out the corrosion tests, the A36SS was subjected to a treatment with NaOH solution without and with the presence of NS. The A36SS treated with NS presented the lowest current density values and the noblest corrosion potential values, indicating that the corrosion rate decreased. The surface morphological study of the tested systems using SEM/EDS showed that the NS‐treated A36SS had a more efficient physical barrier against corrosive species.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140996290","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}
Yashesh Vijay Rajyaguru, Aditi Pandey, Arko Bose, Vishnumurthy Ka
E‐mobility ecosystem is gaining lot of attention in recent years; hence, the requirement for battery technology is very essential. Amongst the various types of batteries, lithium‐based batteries (LIBs) are the one, which are widely used. Hence, recycling lithium in used batteries is very important in terms of sustainability. Many researchers use a variety of techniques for the recycling of lithium ions from batteries. Along with the recycling of lithium, metals such as cadmium, cobalt, lead, iron, manganese, and aluminum also should be recycled. The present review mainly focuses on the various methods of recycling lithium and other metals using different techniques and processes. Also, the economic benefits of the processes are highlighted, which will significantly help the LIB industry to study and investigate the possibility of recycling LIB to achieve a circular economy.
{"title":"Greening the future: Pioneering lithium battery recycling and beyond in the E‐mobility revolution","authors":"Yashesh Vijay Rajyaguru, Aditi Pandey, Arko Bose, Vishnumurthy Ka","doi":"10.1002/vjch.202300241","DOIUrl":"https://doi.org/10.1002/vjch.202300241","url":null,"abstract":"E‐mobility ecosystem is gaining lot of attention in recent years; hence, the requirement for battery technology is very essential. Amongst the various types of batteries, lithium‐based batteries (LIBs) are the one, which are widely used. Hence, recycling lithium in used batteries is very important in terms of sustainability. Many researchers use a variety of techniques for the recycling of lithium ions from batteries. Along with the recycling of lithium, metals such as cadmium, cobalt, lead, iron, manganese, and aluminum also should be recycled. The present review mainly focuses on the various methods of recycling lithium and other metals using different techniques and processes. Also, the economic benefits of the processes are highlighted, which will significantly help the LIB industry to study and investigate the possibility of recycling LIB to achieve a circular economy.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140996991","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}
Linh T. T. Nguyen, Zhong‐Tao Jiang, N. Mondinos, Tuan D. Phan, Kwangsoo No, W. Y. H. Liew
This research investigated the chemical structure and morphology of the hydrogenated tallow amine (HTA)‐intercalated kaolinite by XRD, FT‐IR, and TEM measurements. The experimental outcomes show that intercalation of kaolinite by HTA, with an intercalation rate of 63.2%, expands the interlayer distance with a subsequent dominant basal XRD peak at 2θ ≈ 7.9°. Furthermore, a composite was created from the HTA‐intercalated kaolinite and polydimethylsiloxane (PDMS) through a favorable interaction between the end silanol groups of PDMS and the modified kaolinite surface. Thermogravimetry‐differential scanning calorimetry results indicate that introducing the HTA‐intercalated kaolinite into the PDMS matrix increases the thermal stability of the composite from 178 to 343 °C. However, the thermal stability of the composite is lower than that of other published materials. The synthesis of kaolinite/PDMS composite with enhanced structural and thermal stability outcomes has been provided via a simple and effective solution method that should have further applications.
{"title":"Application of modified kaolinite in improving thermal stability of polydimethylsiloxane","authors":"Linh T. T. Nguyen, Zhong‐Tao Jiang, N. Mondinos, Tuan D. Phan, Kwangsoo No, W. Y. H. Liew","doi":"10.1002/vjch.202300183","DOIUrl":"https://doi.org/10.1002/vjch.202300183","url":null,"abstract":"This research investigated the chemical structure and morphology of the hydrogenated tallow amine (HTA)‐intercalated kaolinite by XRD, FT‐IR, and TEM measurements. The experimental outcomes show that intercalation of kaolinite by HTA, with an intercalation rate of 63.2%, expands the interlayer distance with a subsequent dominant basal XRD peak at 2θ ≈ 7.9°. Furthermore, a composite was created from the HTA‐intercalated kaolinite and polydimethylsiloxane (PDMS) through a favorable interaction between the end silanol groups of PDMS and the modified kaolinite surface. Thermogravimetry‐differential scanning calorimetry results indicate that introducing the HTA‐intercalated kaolinite into the PDMS matrix increases the thermal stability of the composite from 178 to 343 °C. However, the thermal stability of the composite is lower than that of other published materials. The synthesis of kaolinite/PDMS composite with enhanced structural and thermal stability outcomes has been provided via a simple and effective solution method that should have further applications.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140997846","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}
Le Van Trong, Nguyen Thi Thanh Hang, Ha Thi Thu Huong, Le Ngoc Son, Do Quang Huy, Tran Van Son, Nguyen Thanh Ha, Tran Thi Minh Hang, Hoang Minh Trang, Nguyen Manh Khai
This study prepared a novel adsorbent from Corchorus capsularis modified powder for the removal of the tetracycline group (tetracycline ‐TC, oxytetracycline ‐OTC, chlortetracycline ‐CTC) in aqueous solution. Corchorus capsularis powder was pre‐treated with 15% sodium hydroxide (COC), then reformed by a mixture of 0.15 mol L−1 sodium bisulfide (SB) and 0.2 mol L−1 ammonium peroxydisulfate (APS). This adsorbent was embedded with monoacrylamide (AM) at ratio AM/COC = 1/1 at 60 °C for 2.5 h. After modification with AM (BTA), the surface area of the adsorbents increased from 1.53 to 2.79 m2 g−1, while the pore size of the adsorbents decreased from 36.95 to 11.85 nm. The study also investigated the effects of pH, adsorbent dose and temperature on the adsorptive removal process. Tetracycline concentrations were determined using liquid chromatography–tandem mass spectrometry (LC–MS/MS). The kinetics and isotherms of adsorption performance were examined using a variety of models, including pseudo‐first‐order kinetic (PFO), pseudo‐second‐order kinetic (PSO), Freundlich, Langmuir, and Dubinin–Radushkevich isotherms (DRM). The experimental data fitted very well with the pseudo‐second‐order kinetic model. The maximum adsorption bulks of TC, OTC, CTC following Langmuir isotherm model were 1.25, 0.83, 1.43 mg g−1, respectively. The adsorption constants Kp of TC, OTC, and CTC from the Freundlich isotherm model were 15.36, 21.80, and 22.08 mg1−nLng−1, respectively. The mean free energy E (kJ mol−1) of TC, OTC, and CTC from DRM was 4.35, 4.20, and 4.57, respectively. The results indicated that modified Corchorus capsularis powder had significant potential as a new adsorbent material for removing antibiotics from aqueous solutions.
{"title":"Modified powder of Corchorus capsularis as a new adsorbent for removal of tetracycline group antibiotic from water","authors":"Le Van Trong, Nguyen Thi Thanh Hang, Ha Thi Thu Huong, Le Ngoc Son, Do Quang Huy, Tran Van Son, Nguyen Thanh Ha, Tran Thi Minh Hang, Hoang Minh Trang, Nguyen Manh Khai","doi":"10.1002/vjch.202300425","DOIUrl":"https://doi.org/10.1002/vjch.202300425","url":null,"abstract":"This study prepared a novel adsorbent from Corchorus capsularis modified powder for the removal of the tetracycline group (tetracycline ‐TC, oxytetracycline ‐OTC, chlortetracycline ‐CTC) in aqueous solution. Corchorus capsularis powder was pre‐treated with 15% sodium hydroxide (COC), then reformed by a mixture of 0.15 mol L−1 sodium bisulfide (SB) and 0.2 mol L−1 ammonium peroxydisulfate (APS). This adsorbent was embedded with monoacrylamide (AM) at ratio AM/COC = 1/1 at 60 °C for 2.5 h. After modification with AM (BTA), the surface area of the adsorbents increased from 1.53 to 2.79 m2 g−1, while the pore size of the adsorbents decreased from 36.95 to 11.85 nm. The study also investigated the effects of pH, adsorbent dose and temperature on the adsorptive removal process. Tetracycline concentrations were determined using liquid chromatography–tandem mass spectrometry (LC–MS/MS). The kinetics and isotherms of adsorption performance were examined using a variety of models, including pseudo‐first‐order kinetic (PFO), pseudo‐second‐order kinetic (PSO), Freundlich, Langmuir, and Dubinin–Radushkevich isotherms (DRM). The experimental data fitted very well with the pseudo‐second‐order kinetic model. The maximum adsorption bulks of TC, OTC, CTC following Langmuir isotherm model were 1.25, 0.83, 1.43 mg g−1, respectively. The adsorption constants Kp of TC, OTC, and CTC from the Freundlich isotherm model were 15.36, 21.80, and 22.08 mg1−nLng−1, respectively. The mean free energy E (kJ mol−1) of TC, OTC, and CTC from DRM was 4.35, 4.20, and 4.57, respectively. The results indicated that modified Corchorus capsularis powder had significant potential as a new adsorbent material for removing antibiotics from aqueous solutions.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140999835","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}
{"title":"Contents: Vietnam Journal of Chemistry S1/2024","authors":"","doi":"10.1002/vjch.202470021","DOIUrl":"https://doi.org/10.1002/vjch.202470021","url":null,"abstract":"","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141052980","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}
{"title":"Cover","authors":"","doi":"10.1002/vjch.202470022","DOIUrl":"https://doi.org/10.1002/vjch.202470022","url":null,"abstract":"","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141041929","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}
Tuan Anh Nguyen, Doan Thi Yen Oanh, Manh Ha Nguyen, The Huu Nguyen, Thi Thu Phuong Nguyen, Thi Hong Nhung Le, Minh Viet Nguyen, Thi Mai Huong Pham, Quang Tung Nguyen
The nanocomposite material bacterial cellulose/graphene oxide (BC/GO) is fabricated using bacterial cellulose derived from coconut husk biomass. The nano cellulose fibers retain their natural structure and intertwine with graphene oxide. The SEM method confirms the interwoven structure between the nanocellulose fibers and graphene oxide. As the proportion of graphene oxide increases, the tensile strength of the material improves, peaking at 95.68 MPa with a BC:GO ratio of 1:7. Additionally, the Young's modulus measures at 12.87 GPa. Post‐fabrication, the BC/GO membrane undergoes structural and mechanical property evaluations and is tested for its ability to remove As(III) ions from water. Parameters like adsorption capacity, contact time, adsorbent mass, pH values, and stirring rate are assessed for their influence on the adsorption efficiency. Results indicate that the BC/GO‐3 material (BC/GO volume ratio of 1:7) exhibits the most promising performance, achieving a maximum adsorption capacity of 18.69 mg g−1 at pH = 6, 40 °C (313 K), an optimum adsorption time of 160 min, a stirring rate of 150 rpm, and an appropriate adsorbent mass of 0.10 g. The Freundlich and Langmuir isotherm models are found to fit well with the adsorption process based on regression coefficients, suggesting their suitability in describing the adsorption behavior. Additionally, GO/BC demonstrates high efficiency in the regeneration and recovery of As(III) metal ions, as well as a high adsorption capacity.
{"title":"Research to develop the ability to remove As(III) ions in water of an environmentally friendly hybrid material based on bacterial cellulose and graphene oxide","authors":"Tuan Anh Nguyen, Doan Thi Yen Oanh, Manh Ha Nguyen, The Huu Nguyen, Thi Thu Phuong Nguyen, Thi Hong Nhung Le, Minh Viet Nguyen, Thi Mai Huong Pham, Quang Tung Nguyen","doi":"10.1002/vjch.202300419","DOIUrl":"https://doi.org/10.1002/vjch.202300419","url":null,"abstract":"The nanocomposite material bacterial cellulose/graphene oxide (BC/GO) is fabricated using bacterial cellulose derived from coconut husk biomass. The nano cellulose fibers retain their natural structure and intertwine with graphene oxide. The SEM method confirms the interwoven structure between the nanocellulose fibers and graphene oxide. As the proportion of graphene oxide increases, the tensile strength of the material improves, peaking at 95.68 MPa with a BC:GO ratio of 1:7. Additionally, the Young's modulus measures at 12.87 GPa. Post‐fabrication, the BC/GO membrane undergoes structural and mechanical property evaluations and is tested for its ability to remove As(III) ions from water. Parameters like adsorption capacity, contact time, adsorbent mass, pH values, and stirring rate are assessed for their influence on the adsorption efficiency. Results indicate that the BC/GO‐3 material (BC/GO volume ratio of 1:7) exhibits the most promising performance, achieving a maximum adsorption capacity of 18.69 mg g−1 at pH = 6, 40 °C (313 K), an optimum adsorption time of 160 min, a stirring rate of 150 rpm, and an appropriate adsorbent mass of 0.10 g. The Freundlich and Langmuir isotherm models are found to fit well with the adsorption process based on regression coefficients, suggesting their suitability in describing the adsorption behavior. Additionally, GO/BC demonstrates high efficiency in the regeneration and recovery of As(III) metal ions, as well as a high adsorption capacity.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140661840","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}
S. Baharin, Zainiharyati Mohd Zain, Zulhatiqah Zolekafeli, Shahid Mehmood, Kavirajaa Pandian Sambasevam
Conducting polymers (CPs)‐based sensing materials have emerged as a prominent option for the sensitive detection of gaseous ammonia (NH3) due to their cost‐effectiveness, ease of production, and increased sensing performance. Although more than 1400 articles published in the past decades, no bibliometric analysis which can highlight the publication trend and research clusters within the scope of conducting polymer‐based sensors for ammonia detection (CPAD) is available in the literature. The aim of this bibliometric analysis is to document the research trends of CPAD during the last 27 years, since the inception of the first report on conducting polymer as potential NH3 gas sensor which has been published in 1994. The bibliometric analysis was carried out using VOSviewer and Publish or Perish software to analyze keywords trend, the impact of the scientific community, publishing trends among the authors, institutions, and countries. The review discovered that over 80% of the relevant papers produced after 1994, based on bibliographical examination of 1476 Scopus‐indexed articles. Citation analysis was used to identify key authors and articles that shaped the evolution of this literature. Overall, this bibliometric approach allows us to analyze the evolution of a CPAD field while also offering insights on the field's growing areas.
{"title":"Bibliometric analysis on conducting polymer sensors for ammonia gas detection using Scopus database","authors":"S. Baharin, Zainiharyati Mohd Zain, Zulhatiqah Zolekafeli, Shahid Mehmood, Kavirajaa Pandian Sambasevam","doi":"10.1002/vjch.202200122","DOIUrl":"https://doi.org/10.1002/vjch.202200122","url":null,"abstract":"Conducting polymers (CPs)‐based sensing materials have emerged as a prominent option for the sensitive detection of gaseous ammonia (NH3) due to their cost‐effectiveness, ease of production, and increased sensing performance. Although more than 1400 articles published in the past decades, no bibliometric analysis which can highlight the publication trend and research clusters within the scope of conducting polymer‐based sensors for ammonia detection (CPAD) is available in the literature. The aim of this bibliometric analysis is to document the research trends of CPAD during the last 27 years, since the inception of the first report on conducting polymer as potential NH3 gas sensor which has been published in 1994. The bibliometric analysis was carried out using VOSviewer and Publish or Perish software to analyze keywords trend, the impact of the scientific community, publishing trends among the authors, institutions, and countries. The review discovered that over 80% of the relevant papers produced after 1994, based on bibliographical examination of 1476 Scopus‐indexed articles. Citation analysis was used to identify key authors and articles that shaped the evolution of this literature. Overall, this bibliometric approach allows us to analyze the evolution of a CPAD field while also offering insights on the field's growing areas.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140665792","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}
Dinh Hieu Truong, T. C. Ngo, T. A. Nguyen, Thanh Tung Nguyen, S. Taamalli, Abderrahman El Bakali, Florent Louis, D. Q. Dao
The oxidation of thiram (THR) pesticide initiated by HO• radicals in water was investigated using the density functional theory (DFT) approach at the M06‐2X/6‐311++G(3df,3pd)//M06‐2X/6‐31+G(d,p) level of theory. Three oxidation mechanisms were evaluated: radical addition, hydrogen abstraction, and single electron transfer. The results showed that all these reactions are favorable and spontaneous. Among them, the addition reactions at S‐positions have the most prominent rate constants and branching ratios. In addition, the oxidation of THR is temperature‐dependent; the higher the temperature, the faster the oxidation and the higher the removal efficiency. The overall rate constant is k(T) = 7.816 × 10−6 × T5.953 × exp[929.0 (J mol−1)/(RT)] (M−1 s−1), showing a rate constant of 6.09 × 109 m−1 s−1 at 298.15 K which agrees with the previously reported experimental result. In general, thiram can be easily decomposed in a wastewater treatment process with a high concentration of HO•. Still, it may exist in a natural‐like environment with a very low HO• concentration from a few days to several years.
{"title":"Oxidation of thiram fungicide by hydroxyl radicals in water: A theoretical study on reaction mechanism and kinetics","authors":"Dinh Hieu Truong, T. C. Ngo, T. A. Nguyen, Thanh Tung Nguyen, S. Taamalli, Abderrahman El Bakali, Florent Louis, D. Q. Dao","doi":"10.1002/vjch.202300330","DOIUrl":"https://doi.org/10.1002/vjch.202300330","url":null,"abstract":"The oxidation of thiram (THR) pesticide initiated by HO• radicals in water was investigated using the density functional theory (DFT) approach at the M06‐2X/6‐311++G(3df,3pd)//M06‐2X/6‐31+G(d,p) level of theory. Three oxidation mechanisms were evaluated: radical addition, hydrogen abstraction, and single electron transfer. The results showed that all these reactions are favorable and spontaneous. Among them, the addition reactions at S‐positions have the most prominent rate constants and branching ratios. In addition, the oxidation of THR is temperature‐dependent; the higher the temperature, the faster the oxidation and the higher the removal efficiency. The overall rate constant is k(T) = 7.816 × 10−6 × T5.953 × exp[929.0 (J mol−1)/(RT)] (M−1 s−1), showing a rate constant of 6.09 × 109 m−1 s−1 at 298.15 K which agrees with the previously reported experimental result. In general, thiram can be easily decomposed in a wastewater treatment process with a high concentration of HO•. Still, it may exist in a natural‐like environment with a very low HO• concentration from a few days to several years.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140670152","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}
Keval Bhatt, Dhara Patel, Mrudangsinh Rathod, Ashish D. Patel, Drashti Shah
Imidazo[1,2‐a]pyridine, a pivotal fused heterocycle with widespread applications in medicinal chemistry, serves as a foundational scaffold for numerous pharmaceutical compounds. This present approach introduces a highly efficient multi‐step synthetic methodology for imidazo[1,2‐a]pyridine‐8‐carboxamide derivatives through a condensation reaction between 2‐aminonicotinic acid and chloroacetaldehyde in an environmentally friendly ethanol solvent followed by acid‐amine coupling reaction with a substituted amine. This coupling reaction employs an HATU catalyst and DIPEA strong base and affords excellent yields (93%–97%). A total of ten derivatives have been developed and elucidated by spectral methods, including FT‐IR, 1H NMR, and mass spectrometry. In summary, this synthetic strategy possesses favorable attributes for the synthesis of imidazo[1,2‐a]pyridine‐8‐carboxamide derivatives, such as good purity, readily available starting substrates, wide substrate applicability with simple scale‐up and convenient workup procedure. These characteristics render it a promising method for advanced refinement and prospective utilization in synthesizing crucial therapeutic agents.
{"title":"Efficient synthesis and characterization of imidazo[1,2‐a]pyridine‐8‐carboxamide derivatives: A promising scaffold for drug development","authors":"Keval Bhatt, Dhara Patel, Mrudangsinh Rathod, Ashish D. Patel, Drashti Shah","doi":"10.1002/vjch.202300362","DOIUrl":"https://doi.org/10.1002/vjch.202300362","url":null,"abstract":"Imidazo[1,2‐a]pyridine, a pivotal fused heterocycle with widespread applications in medicinal chemistry, serves as a foundational scaffold for numerous pharmaceutical compounds. This present approach introduces a highly efficient multi‐step synthetic methodology for imidazo[1,2‐a]pyridine‐8‐carboxamide derivatives through a condensation reaction between 2‐aminonicotinic acid and chloroacetaldehyde in an environmentally friendly ethanol solvent followed by acid‐amine coupling reaction with a substituted amine. This coupling reaction employs an HATU catalyst and DIPEA strong base and affords excellent yields (93%–97%). A total of ten derivatives have been developed and elucidated by spectral methods, including FT‐IR, 1H NMR, and mass spectrometry. In summary, this synthetic strategy possesses favorable attributes for the synthesis of imidazo[1,2‐a]pyridine‐8‐carboxamide derivatives, such as good purity, readily available starting substrates, wide substrate applicability with simple scale‐up and convenient workup procedure. These characteristics render it a promising method for advanced refinement and prospective utilization in synthesizing crucial therapeutic agents.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140669535","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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