Wiphawee Jiamjai, K. Inyawilert, M. Punginsang, M. Siriwalai, A. Wisitsoraat, C. Liewhiran
In this w ork, effective gas-sensing material were prepared by combining spinel zinc stannate (Zn2SnO4) nanoparticles synthesized by flame spray pyrolysis and graphene produced by the electrolytic exfoliation for volatile organic acids (VOAs) detection. The effect of graphene content in the range of 0.2–5 wt% on formic acid (HCOOH)-sensing performance of Zn2SnO4 nanoparticles was evaluated. Structural, physical, and chemical properties were investigated using X-ray diffraction, Raman spectroscopy, BET-surface analysis, energy dispersive X-ray spectroscopy, and electron microscopy. From the gas-sensing test towards 0.005-0.1 vol% HCOOH in dry air at 200-400°C, the graphene-loaded Zn2SnO4 sensor with the optimal graphene content of 0.5 wt% displayed the highest response of ~4970 towards HCOOH at the optimal temperature of 300°C. Moreover, it showed high HCOOH selectivity against several other VOAs, volatile organic compounds, and environmental gases. Therefore, graphene-loaded spinel Zn2SnO4 sensors could be attractive choices for selective HCOOH detection and useful for food science and industrial applications.
{"title":"Formic Acid Gas Sensors Based on Electrolytically Exfoliated Graphene-loaded Flame-Made Spinel Zn2SnO4 Composites","authors":"Wiphawee Jiamjai, K. Inyawilert, M. Punginsang, M. Siriwalai, A. Wisitsoraat, C. Liewhiran","doi":"10.12982/cmjs.2023.068","DOIUrl":"https://doi.org/10.12982/cmjs.2023.068","url":null,"abstract":"In this w ork, effective gas-sensing material were prepared by combining spinel zinc stannate (Zn2SnO4) nanoparticles synthesized by flame spray pyrolysis and graphene produced by the electrolytic exfoliation for volatile organic acids (VOAs) detection. The effect of graphene content in the range of 0.2–5 wt% on formic acid (HCOOH)-sensing performance of Zn2SnO4 nanoparticles was evaluated. Structural, physical, and chemical properties were investigated using X-ray diffraction, Raman spectroscopy, BET-surface analysis, energy dispersive X-ray spectroscopy, and electron microscopy. From the gas-sensing test towards 0.005-0.1 vol% HCOOH in dry air at 200-400°C, the graphene-loaded Zn2SnO4 sensor with the optimal graphene content of 0.5 wt% displayed the highest response of ~4970 towards HCOOH at the optimal temperature of 300°C. Moreover, it showed high HCOOH selectivity against several other VOAs, volatile organic compounds, and environmental gases. Therefore, graphene-loaded spinel Zn2SnO4 sensors could be attractive choices for selective HCOOH detection and useful for food science and industrial applications.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139208341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A second-or der RC equivalent circuit model was established to improve the estimation accuracy of state of charge (SOC) of power Li-ion batteries, and the model parameters were identified by the recursive least square method with forgetting factor (FFRLS). On this basis, an adaptive cubature kalman filter (ACKF) algorithm was proposed to adaptively modify the process noise covariance matrix and the measurement noise covariance matrix to improve the SOC estimation accuracy. Finally, the SOC estimation algorithm was verified by MATLAB simulations. The results show that compared with UKF and CKF algorithms, the proposed algorithm has higher estimation accuracy and robustness, and can meet the application requirements.
{"title":"Soc Estimation of Li-ion Battery Based on Adaptive CKF Algorithm","authors":"Zhengjun Huang, Yu Chen, Meifang Zhou","doi":"10.12982/cmjs.2023.063","DOIUrl":"https://doi.org/10.12982/cmjs.2023.063","url":null,"abstract":"A second-or der RC equivalent circuit model was established to improve the estimation accuracy of state of charge (SOC) of power Li-ion batteries, and the model parameters were identified by the recursive least square method with forgetting factor (FFRLS). On this basis, an adaptive cubature kalman filter (ACKF) algorithm was proposed to adaptively modify the process noise covariance matrix and the measurement noise covariance matrix to improve the SOC estimation accuracy. Finally, the SOC estimation algorithm was verified by MATLAB simulations. The results show that compared with UKF and CKF algorithms, the proposed algorithm has higher estimation accuracy and robustness, and can meet the application requirements.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139208628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sarunya Sutam, K. Inyawilert, M. Punginsang, M. Siriwalai, A. Wisitsoraat, A. Tuantranont, C. Liewhiran
Gas sensors based on flame-synthesized WO3 nanoparticles loaded with 0.2-5 wt% electrochemically exfoliated graphene were evaluated for NO2 detection at ppb levels. The characterizations by X-Ray diffraction, nitrogen adsorption, electron microscopy and Raman spectrometry verified that multi-layer graphene sheets were well dispersed within spheroidal WO3 nanoparticles. Sensing layers fabricated with different graphene loading levels were tested towards 50-5000 ppb NO2 with varying operating temperatures from 100 to 350 °C in dry air. From the test results, the graphene-loaded WO3 nanoparticles with the optimal graphene content of 2 wt% exhibited the highest sensor response of ~ 5061 to 5000 ppb NO2 at the optimum working temperature of 150 °C. Furthermore, the sensor based on graphene/WO3 composites displayed high NO2 selectivity against various environmental gases and volatile organic compounds at 150 °C. The mechanistic roles of graphene on NO2 gas-sensing performances were described based on reactive ohmic M-S heterointerfaces. Therefore, the combination of electrochemically exfoliated graphene and flame-made WO3 nanoparticles could be an attractive mean to achieve highly sensitive and selective NO2 sensors.
{"title":"Highly Selective NO2 Sensors Based on Electrolytically Exfoliated Graphene/Flame-made WO3 Composite Films","authors":"Sarunya Sutam, K. Inyawilert, M. Punginsang, M. Siriwalai, A. Wisitsoraat, A. Tuantranont, C. Liewhiran","doi":"10.12982/cmjs.2023.067","DOIUrl":"https://doi.org/10.12982/cmjs.2023.067","url":null,"abstract":"Gas sensors based on flame-synthesized WO3 nanoparticles loaded with 0.2-5 wt% electrochemically exfoliated graphene were evaluated for NO2 detection at ppb levels. The characterizations by X-Ray diffraction, nitrogen adsorption, electron microscopy and Raman spectrometry verified that multi-layer graphene sheets were well dispersed within spheroidal WO3 nanoparticles. Sensing layers fabricated with different graphene loading levels were tested towards 50-5000 ppb NO2 with varying operating temperatures from 100 to 350 °C in dry air. From the test results, the graphene-loaded WO3 nanoparticles with the optimal graphene content of 2 wt% exhibited the highest sensor response of ~ 5061 to 5000 ppb NO2 at the optimum working temperature of 150 °C. Furthermore, the sensor based on graphene/WO3 composites displayed high NO2 selectivity against various environmental gases and volatile organic compounds at 150 °C. The mechanistic roles of graphene on NO2 gas-sensing performances were described based on reactive ohmic M-S heterointerfaces. Therefore, the combination of electrochemically exfoliated graphene and flame-made WO3 nanoparticles could be an attractive mean to achieve highly sensitive and selective NO2 sensors.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139208991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Warunee Khampa, Woraprom Passatorntaschakorn, Wongsathon Musikpan, A. Gardchareon, P. Ruankham, D. Wongratanaphisan
T he electron transporting layer (ETL) is a critical component for carbon-based planar Cs0.17FA0.83Pb(I0.83Br0.17)3 perovskite solar cells (C-PSCs), as it facilitates efficient charge transport between the perovskite material and the cathode. The low temperature processed TiO2 nanoparticles (TiO2 NPs) ETL (150°C) are widely employed in C-PSCs. However, the dispersion of commercial TiO2 NPs in colloid solution is often unstable, leading to particle agglomeration and sedimentation, which negatively affects the performance of C-PSCs. Therefore, it is crucial to achieve stable dispersion of TiO2 NPs in colloid solution before their application as ETL in C-PSCs. Furthermore, the surface properties of the TiO2 ETL such as the uniformity of film significantly impact the overall performance of C-PSCs. The objective of this study was to optimize the TiO2 ETL by investigating the dispersion of TiO2 NPs and varying their concentration in the solution for applying in ambient-atmosphere fabricated C-PSCs. The TiO2 NPs were dispersed in different solvents, including isopropanol, ethanol, and water. As a result, ethanol was the most effective solvent for dispersing TiO2 NPs, demonstrating the best dispersion stability. The concentration of TiO2 NPs in ethanol was then varied between 10-70 mg/ml. The results showed that the optimal concentration was 50 mg/ml, as it produced a high-quality ETL with a more uniform TiO2 film. This optimized TiO2 ETL in C-PSCs resulted in the highest power conversion efficiency (PCE) of 13.10% with FF, VOC, and JSC values of 65.50%, 1.02 V, and 19.52 mA/cm2, respectively.
{"title":"Optimal TiO2 Nanoparticles Electron Transporting Layer for Highly Efficient Ambient-atmosphere Fabricated Carbon-based Perovskite Solar Cells","authors":"Warunee Khampa, Woraprom Passatorntaschakorn, Wongsathon Musikpan, A. Gardchareon, P. Ruankham, D. Wongratanaphisan","doi":"10.12982/cmjs.2023.072","DOIUrl":"https://doi.org/10.12982/cmjs.2023.072","url":null,"abstract":"T he electron transporting layer (ETL) is a critical component for carbon-based planar Cs0.17FA0.83Pb(I0.83Br0.17)3 perovskite solar cells (C-PSCs), as it facilitates efficient charge transport between the perovskite material and the cathode. The low temperature processed TiO2 nanoparticles (TiO2 NPs) ETL (150°C) are widely employed in C-PSCs. However, the dispersion of commercial TiO2 NPs in colloid solution is often unstable, leading to particle agglomeration and sedimentation, which negatively affects the performance of C-PSCs. Therefore, it is crucial to achieve stable dispersion of TiO2 NPs in colloid solution before their application as ETL in C-PSCs. Furthermore, the surface properties of the TiO2 ETL such as the uniformity of film significantly impact the overall performance of C-PSCs. The objective of this study was to optimize the TiO2 ETL by investigating the dispersion of TiO2 NPs and varying their concentration in the solution for applying in ambient-atmosphere fabricated C-PSCs. The TiO2 NPs were dispersed in different solvents, including isopropanol, ethanol, and water. As a result, ethanol was the most effective solvent for dispersing TiO2 NPs, demonstrating the best dispersion stability. The concentration of TiO2 NPs in ethanol was then varied between 10-70 mg/ml. The results showed that the optimal concentration was 50 mg/ml, as it produced a high-quality ETL with a more uniform TiO2 film. This optimized TiO2 ETL in C-PSCs resulted in the highest power conversion efficiency (PCE) of 13.10% with FF, VOC, and JSC values of 65.50%, 1.02 V, and 19.52 mA/cm2, respectively.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139202747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dorkrak Chaisarn, N. Suwannarach, S. Lumyong, S. Youpensuk, W. Pathom-aree
L eaf spot disease was observed on Riceberry rice (Oryza sativa L.) in the San Pa-Tong District of Chiang Mai Province, northern Thailand during the rainy season in September 2015. A single strain of Curvularia was isolated from disease symptoms. To confirm its pathogenicity, the isolated fungus was used to inoculate healthy Riceberry rice leaves. Subsequently, the same fungus was re-isolated from the leaves, displaying similar symptoms to those observed in the field. Morphological characteristics and multi-gene phylogenetic analyses of the internal transcribed spacers (ITS) and large subunit (LSU) of nuclear ribosomal DNA, glyceraldehyde-3-phosphate dehydrogenase (GPDH), and the RNA polymerase II second largest subunit (RBP2) genes were applied to identify the pathogen as Curvularia hominis. This finding represents the first report of C. hominis as the causal agent of leaf spot disease on Riceberry rice in Thailand.
2015 年 9 月雨季期间，在泰国北部清迈府 San Pa-Tong 县的水稻（Oryza sativa L.）上观察到叶斑病。从病害症状中分离出一株 Curvularia。为确认其致病性，分离出的真菌被用于接种健康的水稻叶片。随后，从叶片中再次分离出相同的真菌，其症状与田间观察到的症状相似。通过形态学特征以及核糖体 DNA 内部转录间隔（ITS）和大亚基（LSU）、甘油醛-3-磷酸脱氢酶（GPDH）和 RNA 聚合酶 II 第二大亚基（RBP2）基因的多基因系统发育分析，确定病原体为 Curvularia hominis。这一发现是泰国首次报道 C. hominis 是稻米叶斑病的病原菌。
{"title":"First Report of Curvularia hominis as a Causal Agent of Riceberry Rice Leaf Spot in Northern Thailand","authors":"Dorkrak Chaisarn, N. Suwannarach, S. Lumyong, S. Youpensuk, W. Pathom-aree","doi":"10.12982/cmjs.2023.066","DOIUrl":"https://doi.org/10.12982/cmjs.2023.066","url":null,"abstract":"L eaf spot disease was observed on Riceberry rice (Oryza sativa L.) in the San Pa-Tong District of Chiang Mai Province, northern Thailand during the rainy season in September 2015. A single strain of Curvularia was isolated from disease symptoms. To confirm its pathogenicity, the isolated fungus was used to inoculate healthy Riceberry rice leaves. Subsequently, the same fungus was re-isolated from the leaves, displaying similar symptoms to those observed in the field. Morphological characteristics and multi-gene phylogenetic analyses of the internal transcribed spacers (ITS) and large subunit (LSU) of nuclear ribosomal DNA, glyceraldehyde-3-phosphate dehydrogenase (GPDH), and the RNA polymerase II second largest subunit (RBP2) genes were applied to identify the pathogen as Curvularia hominis. This finding represents the first report of C. hominis as the causal agent of leaf spot disease on Riceberry rice in Thailand.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139204544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mantira Suksirt, Kasirapat Ariyaanundech, C. Jantasuriyarat
Rice is the most widely consumed staple food in the world, feeding over half of global population. Thailand has long been an important rice producer and exporter, ranked 6th in the world regarding total milled rice yield. Unfortunately, the major problem of rice production worldwide is rice blast disease which caused by the fungus Magnaporthe oryzae. The most effective method for managing rice blast disease is using resistant rice varieties. One of Thai rice variety that show highly resistance against various rice blast fungus isolates is Jao Hom Nin (JHN) rice, containing broad-spectrum resistance gene, Pi7. However, the identification of resistance genes other than the R gene will confer long-lasting and sustainable resistance to the plant, which lead to identification of genes involved in the plant’s defense against the rice blast fungus in this study. JHN were previously mutagenized with fast-neutron radiation. 2,200 JHN M4 lines were inoculated with mixture of five Thai rice blast fungus isolates. Five susceptible lines lost their resistance due to mutations in the Pi7 gene, while one susceptible line with an intact Pi7 gene could not be characterized as it failed to produce an F1 population. Two moderate resistance lines with intact Pi7 gene were sent for whole-genome resequencing along with JHN wildtype. The sequence comparison between JHN and two mutant lines revealed 491,759 Indel variants. The Indel variants, whose nucleotide sequences differed by less than 10 bp between JHN and mutants, were filtered out. Consequently 33 candidate rice blast defense response genes were predicted to contain high-impact effect Indels, with only 15 of them having predicted functions. Eleven genes were identified as transposons or retrotransposons. Four genes with predicted functions stand out as interesting candidates for future characterization.
{"title":"Screening of Fast-Neutron Mutant Population to Identify Candidate Rice Blast Defense Response Genes","authors":"Mantira Suksirt, Kasirapat Ariyaanundech, C. Jantasuriyarat","doi":"10.12982/cmjs.2023.074","DOIUrl":"https://doi.org/10.12982/cmjs.2023.074","url":null,"abstract":"Rice is the most widely consumed staple food in the world, feeding over half of global population. Thailand has long been an important rice producer and exporter, ranked 6th in the world regarding total milled rice yield. Unfortunately, the major problem of rice production worldwide is rice blast disease which caused by the fungus Magnaporthe oryzae. The most effective method for managing rice blast disease is using resistant rice varieties. One of Thai rice variety that show highly resistance against various rice blast fungus isolates is Jao Hom Nin (JHN) rice, containing broad-spectrum resistance gene, Pi7. However, the identification of resistance genes other than the R gene will confer long-lasting and sustainable resistance to the plant, which lead to identification of genes involved in the plant’s defense against the rice blast fungus in this study. JHN were previously mutagenized with fast-neutron radiation. 2,200 JHN M4 lines were inoculated with mixture of five Thai rice blast fungus isolates. Five susceptible lines lost their resistance due to mutations in the Pi7 gene, while one susceptible line with an intact Pi7 gene could not be characterized as it failed to produce an F1 population. Two moderate resistance lines with intact Pi7 gene were sent for whole-genome resequencing along with JHN wildtype. The sequence comparison between JHN and two mutant lines revealed 491,759 Indel variants. The Indel variants, whose nucleotide sequences differed by less than 10 bp between JHN and mutants, were filtered out. Consequently 33 candidate rice blast defense response genes were predicted to contain high-impact effect Indels, with only 15 of them having predicted functions. Eleven genes were identified as transposons or retrotransposons. Four genes with predicted functions stand out as interesting candidates for future characterization.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139202234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arif Tjahjono, Nadya Salsabila Frendyta, P. A. Paristiawan
R esearch has been carried out to eliminate of the carbide phase (FeMn)3C at the grain boundaries through a double solution treatment. The process begins, which is heating the steel to a temperature of 1000°C with a holding time of 100 minutes, then hot rolling is carried out by 28%. Furthermore, the steel reheated from room temperature to 1100°C with a holding time of 20 minutes, followed by a double solution treatment process, which is heating the steel gradually from room temperature to 730°C with a holding time of 30 minutes, then heating is continued to a temperature of 1000°C with a holding time of 15 minutes, and quenching by water. SEM mapping shows steel contains Fe, Mn, C, S, Si and Ni elements. XRD characterization showed that the double solution treatment process did not change the constituent phases in the form of Fe3O4, γ-Mn, γ-Fe, α-Fe and MnO2, but reduce the crystalline size from 0.0247 to 0.0223 μm. Based on optical microscope and SEM observations, it can be seen that the double solution treatment process was also able to reduce the grain size from 5.33 to 1.30 μm and remove the carbide (FeMn)3C phase at the grain boundaries, as well as successfully change the morphology from cleavage areas to dimple areas.
{"title":"The Effect of Double Solution Treatment on Changes in the Microstructure of Austenitic Manganese Steel","authors":"Arif Tjahjono, Nadya Salsabila Frendyta, P. A. Paristiawan","doi":"10.12982/cmjs.2023.060","DOIUrl":"https://doi.org/10.12982/cmjs.2023.060","url":null,"abstract":"R esearch has been carried out to eliminate of the carbide phase (FeMn)3C at the grain boundaries through a double solution treatment. The process begins, which is heating the steel to a temperature of 1000°C with a holding time of 100 minutes, then hot rolling is carried out by 28%. Furthermore, the steel reheated from room temperature to 1100°C with a holding time of 20 minutes, followed by a double solution treatment process, which is heating the steel gradually from room temperature to 730°C with a holding time of 30 minutes, then heating is continued to a temperature of 1000°C with a holding time of 15 minutes, and quenching by water. SEM mapping shows steel contains Fe, Mn, C, S, Si and Ni elements. XRD characterization showed that the double solution treatment process did not change the constituent phases in the form of Fe3O4, γ-Mn, γ-Fe, α-Fe and MnO2, but reduce the crystalline size from 0.0247 to 0.0223 μm. Based on optical microscope and SEM observations, it can be seen that the double solution treatment process was also able to reduce the grain size from 5.33 to 1.30 μm and remove the carbide (FeMn)3C phase at the grain boundaries, as well as successfully change the morphology from cleavage areas to dimple areas.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139206837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kritchanon Suanjan, W. Liamlaem, Nutta Sangnarin Hamjinda, C. Polprasert
T his research evaluated performance of a solar-based electrochemical system as a post-treatment of hospital wastewater contaminated with Ciprofloxacin (CIP), an antibiotic drug. Two laboratory-scale electrochemical units, and consisting of 2-5 anode and 1-4 cathode plates, were employed. Two types of electrode plates, aluminum (Al) and stainless steel (Ss), were installed in the units and their treatment efficiencies were investigated. Optimum conditions of the electrochemical system were determined by using a synthetic wastewater containing 0.01-20 mg/L of CIP (batch system); these experimental results were validated by using an actual hospital wastewater and a solar-based electrochemical system (continuous system). The experimental results of the batch system showed that the maximum CIP removal of 69% could be achieved at 10 minutes of hydraulic retention time (HRT), 18 volts in a voltage of power source (VPS), 83 A/m2 of current density (CD), and 1 cm of inter-electrode distance (IED) on Al plates. Similar results in the continuous system were obtained when the electrochemical system was fed with hospital wastewater containing CIP of about 350 ng/L. Application of solar-based energy in the electrochemical system showed similar efficiency of CIP removal, suggesting the applicability of the clean energy system for post-treatment of hospital wastewater containing antibiotic drugs
{"title":"Performance of Solar-based Electrochemical System as Post-treatment of Hospital Wastewater Contaminated with Ciprofloxacin","authors":"Kritchanon Suanjan, W. Liamlaem, Nutta Sangnarin Hamjinda, C. Polprasert","doi":"10.12982/cmjs.2023.057","DOIUrl":"https://doi.org/10.12982/cmjs.2023.057","url":null,"abstract":"T his research evaluated performance of a solar-based electrochemical system as a post-treatment of hospital wastewater contaminated with Ciprofloxacin (CIP), an antibiotic drug. Two laboratory-scale electrochemical units, and consisting of 2-5 anode and 1-4 cathode plates, were employed. Two types of electrode plates, aluminum (Al) and stainless steel (Ss), were installed in the units and their treatment efficiencies were investigated. Optimum conditions of the electrochemical system were determined by using a synthetic wastewater containing 0.01-20 mg/L of CIP (batch system); these experimental results were validated by using an actual hospital wastewater and a solar-based electrochemical system (continuous system). The experimental results of the batch system showed that the maximum CIP removal of 69% could be achieved at 10 minutes of hydraulic retention time (HRT), 18 volts in a voltage of power source (VPS), 83 A/m2 of current density (CD), and 1 cm of inter-electrode distance (IED) on Al plates. Similar results in the continuous system were obtained when the electrochemical system was fed with hospital wastewater containing CIP of about 350 ng/L. Application of solar-based energy in the electrochemical system showed similar efficiency of CIP removal, suggesting the applicability of the clean energy system for post-treatment of hospital wastewater containing antibiotic drugs","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139199339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wannachai Chatan, Chanapon Khunwong, S. Kupittayanant, Sasitorn Kerdsuknirund, C. Rojviriya, W. Promprom
Dioscorea alata L., commonly known as water yam, has attracted the attention of scientific researchers for its potential anti-diabetic and estrogenic properties. However, the existing literature lacks specific studies on the anti-diabetic and estrogenic effects of D. alata in the context of type 2 diabetic ovariectomized rats. Thus, Our research focuses on investigating the influence of D. alata on the antidiabetic and estrogenic properties in rats. These rats have developed diabetes through a high-fat diet and streptozotocin induction and have also undergone ovariectomy, making them type 2 diabetic ovariectomized rats (T2DM OVX). This comprehensive study both in vitro and in vivo methodologies. We conducted a phytochemical analysis, revealing the presence of key bioactive constituents, including flavonoids, alkaloids, terpenoids, tannins, saponins, cardiac glycosides, and steroids. The results of our phytochemical screening confirm the remarkable antidiabetic properties of the D. alata extract, as it effectively inhibits α-glucosidase activity, leading to a significant reduction in fasting blood glucose levels. Additionally, it enhances body weight, serum insulin levels, and pancreatic islet size. The extract also demonstrates notable estrogenic effects by significantly increasing uterine wet weight, endometrial and myometrium thickness, bone calcium, and overall bone density, while reducing bone porosity in the T2DM OVX rats. It is important to note that while the D. alata extract exhibits slightly less potent α-glucosidase inhibition compared to acarbose, it showcases potent antidiabetic activity at a dose of 1,000 mg/kg body weight, comparable to Metformin (250 mg/kg body weight). In terms of estrogenic activity, it is slightly less potent than 17β-estradiol (1 mg/kg body weight). These findings provide robust evidence supporting the traditional use of D. alata and its efficacy in the context of antidiabetic and estrogenic properties within the T2DM OVX model.
{"title":"Dioscorea alata L. Tubers Ethanol Extract Improves Insulin Resistance and Estrogen Defectively in Type 2 Diabetic Ovariectomized Rats","authors":"Wannachai Chatan, Chanapon Khunwong, S. Kupittayanant, Sasitorn Kerdsuknirund, C. Rojviriya, W. Promprom","doi":"10.12982/cmjs.2023.076","DOIUrl":"https://doi.org/10.12982/cmjs.2023.076","url":null,"abstract":"Dioscorea alata L., commonly known as water yam, has attracted the attention of scientific researchers for its potential anti-diabetic and estrogenic properties. However, the existing literature lacks specific studies on the anti-diabetic and estrogenic effects of D. alata in the context of type 2 diabetic ovariectomized rats. Thus, Our research focuses on investigating the influence of D. alata on the antidiabetic and estrogenic properties in rats. These rats have developed diabetes through a high-fat diet and streptozotocin induction and have also undergone ovariectomy, making them type 2 diabetic ovariectomized rats (T2DM OVX). This comprehensive study both in vitro and in vivo methodologies. We conducted a phytochemical analysis, revealing the presence of key bioactive constituents, including flavonoids, alkaloids, terpenoids, tannins, saponins, cardiac glycosides, and steroids. The results of our phytochemical screening confirm the remarkable antidiabetic properties of the D. alata extract, as it effectively inhibits α-glucosidase activity, leading to a significant reduction in fasting blood glucose levels. Additionally, it enhances body weight, serum insulin levels, and pancreatic islet size. The extract also demonstrates notable estrogenic effects by significantly increasing uterine wet weight, endometrial and myometrium thickness, bone calcium, and overall bone density, while reducing bone porosity in the T2DM OVX rats. It is important to note that while the D. alata extract exhibits slightly less potent α-glucosidase inhibition compared to acarbose, it showcases potent antidiabetic activity at a dose of 1,000 mg/kg body weight, comparable to Metformin (250 mg/kg body weight). In terms of estrogenic activity, it is slightly less potent than 17β-estradiol (1 mg/kg body weight). These findings provide robust evidence supporting the traditional use of D. alata and its efficacy in the context of antidiabetic and estrogenic properties within the T2DM OVX model.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139206591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Biodiesel is a r enewable, biodegradable, and non-toxic fuel derived from vegetable oils, animal fats, or recycled cooking oils. Biodiesel can be used as a direct replacement for diesel in diesel engines with minimal or no modification, and it has several advantages over conventional diesel. Eggshells, on the other hand, are composed mainly of calcium carbonate (CaCO3), a valuable resource for various industrial and agricultural applications. Improper disposal of eggshells can cause environmental pollution and discarding of eggshells in landfills takes up valuable space and emits potent greenhouse gases such as methane. The current study focuses on biodiesel production from waste cooking oil (WCO) using heterogeneous catalysts from eggshells impregnated with Zinc (Zn) metal. The transesterification process can produce biodiesel using WCO in the presence of a catalyst. The free fatty acid (FFA) of WCO is 0.45 mg KOH/g lower, enabling the transesterification process. The CaCO3 present in the eggshell will be converted into calcium oxide (CaO) after calcination. SEM analysis showed the catalyst’s morphology (CaO and CaO/Zn) changes after undergoing calcination and zinc impregnation processes. In this study, eggshells were utilized as a potential solid catalyst for biodiesel synthesis through transesterification. The reusability of the catalyst was also investigated. The reused catalyst produced an average yield of 65%.
{"title":"Biodiesel Production from Waste Cooking Oil using Heterogeneous CaO/Zn Catalyst: Yield and Reusability Performance","authors":"N. A. Ali, Nozieana Khairuddin","doi":"10.12982/cmjs.2023.070","DOIUrl":"https://doi.org/10.12982/cmjs.2023.070","url":null,"abstract":"Biodiesel is a r enewable, biodegradable, and non-toxic fuel derived from vegetable oils, animal fats, or recycled cooking oils. Biodiesel can be used as a direct replacement for diesel in diesel engines with minimal or no modification, and it has several advantages over conventional diesel. Eggshells, on the other hand, are composed mainly of calcium carbonate (CaCO3), a valuable resource for various industrial and agricultural applications. Improper disposal of eggshells can cause environmental pollution and discarding of eggshells in landfills takes up valuable space and emits potent greenhouse gases such as methane. The current study focuses on biodiesel production from waste cooking oil (WCO) using heterogeneous catalysts from eggshells impregnated with Zinc (Zn) metal. The transesterification process can produce biodiesel using WCO in the presence of a catalyst. The free fatty acid (FFA) of WCO is 0.45 mg KOH/g lower, enabling the transesterification process. The CaCO3 present in the eggshell will be converted into calcium oxide (CaO) after calcination. SEM analysis showed the catalyst’s morphology (CaO and CaO/Zn) changes after undergoing calcination and zinc impregnation processes. In this study, eggshells were utilized as a potential solid catalyst for biodiesel synthesis through transesterification. The reusability of the catalyst was also investigated. The reused catalyst produced an average yield of 65%.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139198883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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