Pub Date : 2022-03-29DOI: 10.24200/amecj.v5.i01.171
H. Asadollahzadeh, M. Ghazizadeh
A voltammetry method for the determination of pyrogallol (PY) was developed employing a carbon paste electrode (CPE) modified with CdS nanoparticle that was synthesized by microwave. The effect of different parameters i.e. time and irradiation power on the morphology and the sample’s particle size have been investigated. The synthesized nanostructures were characterized by X-ray diffraction and scanning electron microscopy. The optimized condition for time and power consumption to prepare CdS nanoparticles was obtained 4 min and 360 W. Cyclic voltammetry study of the modified electrode indicated that the oxidation potential shifted towards a lower potential by approximately 106 mV and the peak current was enhanced by 2 fold in comparison to the bare CPE. The effect of pH and interferences from some inorganic salts and organic compounds were studied. The usability of this method for the quantification of pyrogallol was investigated with differential pulse voltammetry (DPV). Under the optimal conditions, the peak current was proportional to pyrogallol concentration in the range of 7.0 ×10-7 to 3.0 × 10-4 mol L-1 with a LOD of 4.8 × 10-7 mol L-1. These values are satisfactory for application to real samples. Finally, the developed method was successfully used for the analysis of samples.
{"title":"Sensitive voltammetry method for analysis of the antioxidant pyrogallol using a carbon paste electrode with CdS nanoparticle","authors":"H. Asadollahzadeh, M. Ghazizadeh","doi":"10.24200/amecj.v5.i01.171","DOIUrl":"https://doi.org/10.24200/amecj.v5.i01.171","url":null,"abstract":"A voltammetry method for the determination of pyrogallol (PY) was developed employing a carbon paste electrode (CPE) modified with CdS nanoparticle that was synthesized by microwave. The effect of different parameters i.e. time and irradiation power on the morphology and the sample’s particle size have been investigated. The synthesized nanostructures were characterized by X-ray diffraction and scanning electron microscopy. The optimized condition for time and power consumption to prepare CdS nanoparticles was obtained 4 min and 360 W. Cyclic voltammetry study of the modified electrode indicated that the oxidation potential shifted towards a lower potential by approximately 106 mV and the peak current was enhanced by 2 fold in comparison to the bare CPE. The effect of pH and interferences from some inorganic salts and organic compounds were studied. The usability of this method for the quantification of pyrogallol was investigated with differential pulse voltammetry (DPV). Under the optimal conditions, the peak current was proportional to pyrogallol concentration in the range of 7.0 ×10-7 to 3.0 × 10-4 mol L-1 with a LOD of 4.8 × 10-7 mol L-1. These values are satisfactory for application to real samples. Finally, the developed method was successfully used for the analysis of samples. \u0000 ","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82121526","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}
Pub Date : 2022-03-29DOI: 10.24200/amecj.v5.i01.168
E. Nabatian, M. Dolatabadi, Saeid Ahmadzadeh
Acetaminophen is a widely used drug worldwide and is frequently detected in water and wastewater as a high-priority trace pollutant. This study investigated the applicability of the adsorption processes using a composite of magnetic chitosan and multi-walled carbon nanotubes (MCS@MWCNTs) as an adsorbent in the treatment of acetaminophen. The model was well fitted to the actual data, and the correlation coefficients of R2 and adjusted R2 were 0.9270 and 0.8885, respectively. The maximum ACT removal efficiency of 98.1% was achieved at ACT concentration of 45 mg L-1, pH of 6.5, MCS@MWCNTs dosage of 400 mg L-1, and the reaction time of 23 min. The result shows that BET specific surface area of 640 m2 g-1. The adsorption isotherms were well fitted with the Langmuir Model (R2 =0.9961), depicting the formation of monolayer adsorbate onto the surface of MCS@MWCNTs. The maximum monolayer adsorption capacity of 256.4 mg g-1 was observed for MCS@MWCNTs. The pseudo-second-order kinetic model well depicted the kinetics of ACT adsorption on MCS@MWCNTs (R2=0.9972). Desorption studies showed that the desorption process is favored at high pH under Alkaline conditions. The results demonstrate that the MCS@MWCNTs is an efficient, durable, and sustainable adsorbent in water purification treatment.
{"title":"Application of experimental design methodology to optimize acetaminophen removal from aqueous environment by magnetic chitosan@multi-walled carbon nanotube composite: Isotherm, kinetic, and regeneration studies","authors":"E. Nabatian, M. Dolatabadi, Saeid Ahmadzadeh","doi":"10.24200/amecj.v5.i01.168","DOIUrl":"https://doi.org/10.24200/amecj.v5.i01.168","url":null,"abstract":"Acetaminophen is a widely used drug worldwide and is frequently detected in water and wastewater as a high-priority trace pollutant. This study investigated the applicability of the adsorption processes using a composite of magnetic chitosan and multi-walled carbon nanotubes (MCS@MWCNTs) as an adsorbent in the treatment of acetaminophen. The model was well fitted to the actual data, and the correlation coefficients of R2 and adjusted R2 were 0.9270 and 0.8885, respectively. The maximum ACT removal efficiency of 98.1% was achieved at ACT concentration of 45 mg L-1, pH of 6.5, MCS@MWCNTs dosage of 400 mg L-1, and the reaction time of 23 min. The result shows that BET specific surface area of 640 m2 g-1. The adsorption isotherms were well fitted with the Langmuir Model (R2 =0.9961), depicting the formation of monolayer adsorbate onto the surface of MCS@MWCNTs. The maximum monolayer adsorption capacity of 256.4 mg g-1 was observed for MCS@MWCNTs. The pseudo-second-order kinetic model well depicted the kinetics of ACT adsorption on MCS@MWCNTs (R2=0.9972). Desorption studies showed that the desorption process is favored at high pH under Alkaline conditions. The results demonstrate that the MCS@MWCNTs is an efficient, durable, and sustainable adsorbent in water purification treatment.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83444943","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}
Pub Date : 2022-03-28DOI: 10.24200/amecj.v5.i01.163
Danial Soleymani-Ghoozhdi, Rouhollah Parvari, Yunes Jahani, Morteza Mehdipour-Raboury, A. Faghihi-Zarandi
Heavy metals are a major cause of environmental pollution, and mercury is a well-known toxicant that is extremely harmful to the environment and human health. In this study, new carbon nanotubes coated with cobalt and molybdenum nanoparticles (Co-Mo/MWCNT) were used for Hg0 removal from the air by the amalgamation of solid-phase air removal method (ASPAR). In the bench-scale setup, the mercury vapor in air composition was produced by the mercury vapor generation system (HgGS) and restored in a polyethylene airbag . In optimized conditions, the mercury vapor in the airbag passed through Co-Mo/MWCNT and was absorbed on it. Then, the mercury was completely desorbed from Co-Mo/MWCNT by increasing temperature up to 220 °C and online determined by cold vapor atomic absorption spectrometry (CV-AAS). The recovery and capacity of Co-Mo/MWCNT were obtained at 98% and 191.3 mg g-1, respectively. The Repeatability of the method was 32 times. The mercury vapors absorbed on Co-Mo/MWCNT adsorbent could be maintained at 7 days at the refrigerator temperature. The Co-Mo/MWCNT as a sorbent has many advantages such as; high capacity, renewable, good repeatability and chemical adsorption (amalgamation) of mercury removal from the air. The method was successfully validated by MCA and spiking of real samples.
{"title":"A new analytical method based on Co-Mo nanoparticles supported by carbon nanotubes for removal of mercury vapor from the air by the amalgamation of solid-phase air removal","authors":"Danial Soleymani-Ghoozhdi, Rouhollah Parvari, Yunes Jahani, Morteza Mehdipour-Raboury, A. Faghihi-Zarandi","doi":"10.24200/amecj.v5.i01.163","DOIUrl":"https://doi.org/10.24200/amecj.v5.i01.163","url":null,"abstract":"Heavy metals are a major cause of environmental pollution, and mercury is a well-known toxicant that is extremely harmful to the environment and human health. In this study, new carbon nanotubes coated with cobalt and molybdenum nanoparticles (Co-Mo/MWCNT) were used for Hg0 removal from the air by the amalgamation of solid-phase air removal method (ASPAR). In the bench-scale setup, the mercury vapor in air composition was produced by the mercury vapor generation system (HgGS) and restored in a polyethylene airbag . In optimized conditions, the mercury vapor in the airbag passed through Co-Mo/MWCNT and was absorbed on it. Then, the mercury was completely desorbed from Co-Mo/MWCNT by increasing temperature up to 220 °C and online determined by cold vapor atomic absorption spectrometry (CV-AAS). The recovery and capacity of Co-Mo/MWCNT were obtained at 98% and 191.3 mg g-1, respectively. The Repeatability of the method was 32 times. The mercury vapors absorbed on Co-Mo/MWCNT adsorbent could be maintained at 7 days at the refrigerator temperature. The Co-Mo/MWCNT as a sorbent has many advantages such as; high capacity, renewable, good repeatability and chemical adsorption (amalgamation) of mercury removal from the air. The method was successfully validated by MCA and spiking of real samples.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76843558","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}
Pub Date : 2022-03-28DOI: 10.24200/amecj.v5.i01.167
Mohammad Reza Rezaei Kahkha, Ahmad Salarifar, Batool Rezaei Kahkha
Heavy metals (HMs) are considered as the major environmental pollutants that accumulated in soil and plant. Consumption of such contaminated plants by humans and animals would ultimately harm the health of communities. This study aims to evaluate the amount of copper(Co), cadmium(Cd), and lead(Pb) in soil and cultivated plants that are irrigated by the city of Zabol’s wastewater. Also, the heavy metals determined in 20 mL of Zabol’s water based on Bis(triethoxysilylpropyl)tetrasulfide (S4[C3H6Si(OEt)3]2, TEOSiP-TS) modified on MWCNTs as an adsorbent by the uniform dispersive -micro-solid phase extraction (UD-µ-SPE) at optimized pH. In this study, 52 samples including wheat, corn grain, and wild spinach, as well as agricultural soil were selected randomly from three village stations. The concentrations of heavy metals in plants, soils, and water samples were measured using a flame atomic absorption spectrometer (F-AAS). By optimizing parameters, the linear range (LR) and the detection limit (LOD) of Cu, Cd, and Pb were obtained 1.5-1000 μg L-1, 1-200 μg L-1, 5-1500 μg L-1 and 0.5 μg L-1, 0.25 μg L-1, 1.5 μg L-1, respectively in water samples (RSD%<2). This study indicates that irrigation of agricultural fields using wastewater causes the accumulation of heavy metals in soil and plants.
{"title":"Measurement of heavy metals in soil, plants and water samples based on MWCNTs modified with Bis(triethoxysilylpropyl)tetrasulfide by flame atomic absorption spectrophotometry","authors":"Mohammad Reza Rezaei Kahkha, Ahmad Salarifar, Batool Rezaei Kahkha","doi":"10.24200/amecj.v5.i01.167","DOIUrl":"https://doi.org/10.24200/amecj.v5.i01.167","url":null,"abstract":"Heavy metals (HMs) are considered as the major environmental pollutants that accumulated in soil and plant. Consumption of such contaminated plants by humans and animals would ultimately harm the health of communities. This study aims to evaluate the amount of copper(Co), cadmium(Cd), and lead(Pb) in soil and cultivated plants that are irrigated by the city of Zabol’s wastewater. Also, the heavy metals determined in 20 mL of Zabol’s water based on Bis(triethoxysilylpropyl)tetrasulfide (S4[C3H6Si(OEt)3]2, TEOSiP-TS) modified on MWCNTs as an adsorbent by the uniform dispersive -micro-solid phase extraction (UD-µ-SPE) at optimized pH. In this study, 52 samples including wheat, corn grain, and wild spinach, as well as agricultural soil were selected randomly from three village stations. The concentrations of heavy metals in plants, soils, and water samples were measured using a flame atomic absorption spectrometer (F-AAS). By optimizing parameters, the linear range (LR) and the detection limit (LOD) of Cu, Cd, and Pb were obtained 1.5-1000 μg L-1, 1-200 μg L-1, 5-1500 μg L-1 and 0.5 μg L-1, 0.25 μg L-1, 1.5 μg L-1, respectively in water samples (RSD%<2). This study indicates that irrigation of agricultural fields using wastewater causes the accumulation of heavy metals in soil and plants.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76637850","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}
Pub Date : 2022-03-27DOI: 10.24200/amecj.v5.i01.170
V. Saheb, T. Shamspur
In this research, 2-mercapto-1-methylimidazole a novel Task-specific ionic liquid (C4H6N2S; HS-CH3-IM) was used with a new approach for speciation of Cr (III, VI) from water samples by ultra-assisted dispersive ionic liquid-liquid microextraction procedure (USA-D-ILLME). Due to the procedure, 100 mg of HS-CH3-IM and 0.2 mL of acetone were mixed and injected into 10 mL of water or standard Cr (III) and Cr (VI) solution in the conical tube. After stirring for 5 min, the Cr (VI) and Cr (III) were extracted with a positive and negative charge of the thiol group (HS2+, HS-) in pH 2 or 8 and pH 5, respectively. The Cr (III, VI) loaded on the HS-CH3-IM was back-extracted in a liquid solution. Finally, the concentration of the Cr (III, VI) ions in a remained solution were measured with ET-AAS . The total chromium was determined in water samples by summarizing the Cr (VI) and Cr (III) contents. All parameters such as the amount of HS-CH3-IM, the sample volume, pH, and the shaking/centrifuging time were optimized. Under the optimal conditions, good linear range (LR), LOD, and enrichment factor (EF) were obtained 0.05–1.7 μg L−1, 15 ng L−1, and 19.82 respectively (RSD% < 1.45).
{"title":"Rapid analysis of chromium (III, VI) in water and wastewater samples based on Task-specific ionic liquid by the ultra-assisted dispersive ionic liquid-liquid microextraction","authors":"V. Saheb, T. Shamspur","doi":"10.24200/amecj.v5.i01.170","DOIUrl":"https://doi.org/10.24200/amecj.v5.i01.170","url":null,"abstract":" In this research, 2-mercapto-1-methylimidazole a novel Task-specific ionic liquid (C4H6N2S; HS-CH3-IM) was used with a new approach for speciation of Cr (III, VI) from water samples by ultra-assisted dispersive ionic liquid-liquid microextraction procedure (USA-D-ILLME). Due to the procedure, 100 mg of HS-CH3-IM and 0.2 mL of acetone were mixed and injected into 10 mL of water or standard Cr (III) and Cr (VI) solution in the conical tube. After stirring for 5 min, the Cr (VI) and Cr (III) were extracted with a positive and negative charge of the thiol group (HS2+, HS-) in pH 2 or 8 and pH 5, respectively. The Cr (III, VI) loaded on the HS-CH3-IM was back-extracted in a liquid solution. Finally, the concentration of the Cr (III, VI) ions in a remained solution were measured with ET-AAS . The total chromium was determined in water samples by summarizing the Cr (VI) and Cr (III) contents. All parameters such as the amount of HS-CH3-IM, the sample volume, pH, and the shaking/centrifuging time were optimized. Under the optimal conditions, good linear range (LR), LOD, and enrichment factor (EF) were obtained 0.05–1.7 μg L−1, 15 ng L−1, and 19.82 respectively (RSD% < 1.45). ","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87165359","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}
Pub Date : 2022-03-23DOI: 10.24200/amecj.v5.i01.165
Bahareh Azemi motlagh, A. Mohammadi, M. Ardjmand
Nitrate is a hazardous substance for human health, the removal of which is an important environmental priority. Therefore, in this study, first, the sources of nitrate pollution of water were investigated, then the structure, role, and application of nanozeolites for the removal of nitrate ions were studied by the analytical method. Also, the presentation of management solutions, identification of polluting industrial sectors, different methods of removal and fabrication of ZSM-5/Fe/Ni nanosorbents, and the determination of optimal conditions for nitrate removal were investigated by experimental design software and graphical analysis of effective parameters. The results of graphical analysis of laboratory method showed us, the highest nitrate removal efficiency at a residence time of 150 minutes, pH 3, 4 g L-1 adsorbent, and 40 mg L-1 nitrate were achieved (%RE:91.5-97.4). Experimental results indicate the high efficiency, absorption capacity, and effectiveness of ZSM-5/Fe/Ni adsorbents for nitrate removal in waters. Finally, the absorbance values or nitrate concentrations between 20-120 mg L-1 were measured by the UV-Vis spectrophotometry. The maximum absorption capacity of ZSM-5/Fe/Ni adsorbents for nitrate was obtained 136.7 mg g-1. The developed method based on a novel ZSM-5/Fe/Ni adsorbents has many advantages such as simple, low cost, high efficiency, and favorite recovery.
{"title":"Management and removal of nitrate contamination of water at the source using modified natural nano zeolite","authors":"Bahareh Azemi motlagh, A. Mohammadi, M. Ardjmand","doi":"10.24200/amecj.v5.i01.165","DOIUrl":"https://doi.org/10.24200/amecj.v5.i01.165","url":null,"abstract":"Nitrate is a hazardous substance for human health, the removal of which is an important environmental priority. Therefore, in this study, first, the sources of nitrate pollution of water were investigated, then the structure, role, and application of nanozeolites for the removal of nitrate ions were studied by the analytical method. Also, the presentation of management solutions, identification of polluting industrial sectors, different methods of removal and fabrication of ZSM-5/Fe/Ni nanosorbents, and the determination of optimal conditions for nitrate removal were investigated by experimental design software and graphical analysis of effective parameters. The results of graphical analysis of laboratory method showed us, the highest nitrate removal efficiency at a residence time of 150 minutes, pH 3, 4 g L-1 adsorbent, and 40 mg L-1 nitrate were achieved (%RE:91.5-97.4). Experimental results indicate the high efficiency, absorption capacity, and effectiveness of ZSM-5/Fe/Ni adsorbents for nitrate removal in waters. Finally, the absorbance values or nitrate concentrations between 20-120 mg L-1 were measured by the UV-Vis spectrophotometry. The maximum absorption capacity of ZSM-5/Fe/Ni adsorbents for nitrate was obtained 136.7 mg g-1. The developed method based on a novel ZSM-5/Fe/Ni adsorbents has many advantages such as simple, low cost, high efficiency, and favorite recovery. ","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73879536","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}
Pub Date : 2021-12-30DOI: 10.24200/amecj.v4.i04.154
M. Hassani, M. Zeeb, A. Monzavi, Z. Khodadadi, M. Kalaee
The life-threatening nature of high nitrate concentrations in various water resources motivated the present study to investigate the nitrate adsorption by ZSM-5 nanozeolite and the feasibility of increasing nitrate removal efficiency using iron-doped ZSM-5 (ZSM-5/Fe) nanosorbent. Energy dispersive X-ray diffraction analysis was employed to determine the physical properties of the adsorbent and the presence of iron particles in the nanosorbent structure and BET analysis to measure the specific surface area of the nanosorbent. The optimal adsorption conditions were determined first by modeling the central composite design (CCD) using Design Expert.7 software based on four influential factors . Then, the isotherms of nitrate adsorption under optimized conditions were investigated using the degree of fit of experimental data with Langmuir and Freundlich models for mathematical modeling of the nitrate adsorption process. Based on the test design results, the highest nitrate removal efficiency (%93.1) was reported at the contact time of 150 min, pH value of 3, adsorbent dosage of 4 g/l and initial concentration of 40 mg/l. Analysis of adsorption isotherms also confirmed the greater fit of the experimental data with the Freundlich equation, so that the correction factor of the Freundlich equation was greater than the Langmuir equation.
{"title":"Adsorption of nitrate from aqueous solution with ZSM-5/Fe nanosorbent based on optimizing of the isotherms conditions before determination by UV-Vis Spectrophotometry","authors":"M. Hassani, M. Zeeb, A. Monzavi, Z. Khodadadi, M. Kalaee","doi":"10.24200/amecj.v4.i04.154","DOIUrl":"https://doi.org/10.24200/amecj.v4.i04.154","url":null,"abstract":"The life-threatening nature of high nitrate concentrations in various water resources motivated the present study to investigate the nitrate adsorption by ZSM-5 nanozeolite and the feasibility of increasing nitrate removal efficiency using iron-doped ZSM-5 (ZSM-5/Fe) nanosorbent. Energy dispersive X-ray diffraction analysis was employed to determine the physical properties of the adsorbent and the presence of iron particles in the nanosorbent structure and BET analysis to measure the specific surface area of the nanosorbent. The optimal adsorption conditions were determined first by modeling the central composite design (CCD) using Design Expert.7 software based on four influential factors . Then, the isotherms of nitrate adsorption under optimized conditions were investigated using the degree of fit of experimental data with Langmuir and Freundlich models for mathematical modeling of the nitrate adsorption process. Based on the test design results, the highest nitrate removal efficiency (%93.1) was reported at the contact time of 150 min, pH value of 3, adsorbent dosage of 4 g/l and initial concentration of 40 mg/l. Analysis of adsorption isotherms also confirmed the greater fit of the experimental data with the Freundlich equation, so that the correction factor of the Freundlich equation was greater than the Langmuir equation.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90877578","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}
Pub Date : 2021-12-30DOI: 10.24200/amecj.v4.i04.161
A. Hassanzadeh, B. Amirheidari, Ahmad Salarifar, A. Asadipour, Yaghoub Pourshojaei
In this research, meta-(4-bromobenzyloxy) benzaldehyde thiosemicarbazone (MBBOTSC) as a novel ligand was synthesized from the reaction between meta-(4-bromobenzyloxy) benzaldehyde and thiosemicarbazide under basic condition in water and ethanol as solvents. Ligand has the ability to chelate ions and therefore, it was used to form a complex and extract ions. Then, the cadmium ions in water and wastewater samples were separated based on MBBOTSC by ultrasound assisted-dispersive-ionic liquid-liquid microextraction method (USA-D-ILLME) before determination by AT-F-AAS. The MBBOTSC ligand was added to the mixture of the ionic liquid/acetone (IL/AC, [OMIM][PF6]) and then injected by syringe to 50 mL of water samples at pH 6-7. The sample was put into the ultrasonic accessory for 5 minutes, after complexation (Ligand-Cd; RS…Cd….RS), the water sample was centrifuged for 3 min for phase separation. Due to complexation and back-extraction of Cd in liquid phase, the amount of Cd ions in the water samples was determined by AT-F-AAS . In optimized conditions, the Linear ranges and LOD for 50 mL of water samples were obtained 1-36 μg L-1 and 0.3 μg L-1, respectively (Mean RSD= 1.26%). The validation results were successfully achieved by spiking real samples and using ET-AAS.
{"title":"Synthesis and identification of meta-(4-bromobenzyloxy) benzaldehyde thiosemicarbazone (MBBOTSC) as novel ligand for cadmium extraction by ultrasound assisted-dispersive-ionic liquid-liquid micro extraction method","authors":"A. Hassanzadeh, B. Amirheidari, Ahmad Salarifar, A. Asadipour, Yaghoub Pourshojaei","doi":"10.24200/amecj.v4.i04.161","DOIUrl":"https://doi.org/10.24200/amecj.v4.i04.161","url":null,"abstract":"In this research, meta-(4-bromobenzyloxy) benzaldehyde thiosemicarbazone (MBBOTSC) as a novel ligand was synthesized from the reaction between meta-(4-bromobenzyloxy) benzaldehyde and thiosemicarbazide under basic condition in water and ethanol as solvents. Ligand has the ability to chelate ions and therefore, it was used to form a complex and extract ions. Then, the cadmium ions in water and wastewater samples were separated based on MBBOTSC by ultrasound assisted-dispersive-ionic liquid-liquid microextraction method (USA-D-ILLME) before determination by AT-F-AAS. The MBBOTSC ligand was added to the mixture of the ionic liquid/acetone (IL/AC, [OMIM][PF6]) and then injected by syringe to 50 mL of water samples at pH 6-7. The sample was put into the ultrasonic accessory for 5 minutes, after complexation (Ligand-Cd; RS…Cd….RS), the water sample was centrifuged for 3 min for phase separation. Due to complexation and back-extraction of Cd in liquid phase, the amount of Cd ions in the water samples was determined by AT-F-AAS . In optimized conditions, the Linear ranges and LOD for 50 mL of water samples were obtained 1-36 μg L-1 and 0.3 μg L-1, respectively (Mean RSD= 1.26%). The validation results were successfully achieved by spiking real samples and using ET-AAS.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81126170","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}
Lithium regulates the concentration of nitric oxide in the human body and a high dose of nitric oxide causes multiple sclerosis (MS). Also, the amount of manganese in the cerebrospinal fluid alters the metabolic reactions associated with MS. In this study, the mixture of the ammonium pyrrolidine dithiocarbonate (APDC), the hydrophobic ionic liquid [HMIM][PF6] and acetone coated on the surface of graphene oxide nanoparticles (GONPs) and used for separation Li and Mn in human samples by ultrasound assisted-dispersive-ionic liquid-micro-solid phase extraction technique (USA-DIL-μ-SPE) at pH 6.0. After extraction and back-extraction, the amount of lithium and manganese in the blood, serum and urine samples was determined by the flame and the graphite furnace atomic absorption spectroscopy (F-AAS, GF-AAS), respectively. By optimizing parameters, the LOD, Linear ranges (LR) and preconcentration factor (PF) for Li and Mn ions were obtained (0.03 mg L-1, 0.25 μg L-1), (0.1-0.4 mg L-1, 0.08-1.5 μg L-1) and 10, respectively (%RSD<5). The capacity adsorption of APDC/IL/GONPs and GONPs was achieved (148.5 mg g-1, 122.3 mg g-1) and (41.3 mg g-1, 33.7 mg g-1) for Li and Mn ions in a static system, respectively. This method was successfully validated by spiking samples and certified reference materials (CRM).
{"title":"Separation and determination of lithium and manganese ions in healthy humans and multiple sclerosis patients based on Nano graphene oxide by Ultrasound assisted-dispersive -micro solid-phase extraction","authors":"Seyed Majid Nabipour Haghighi, Negar Motakef Kazemi","doi":"10.24200/amecj.v4.i04.158","DOIUrl":"https://doi.org/10.24200/amecj.v4.i04.158","url":null,"abstract":"Lithium regulates the concentration of nitric oxide in the human body and a high dose of nitric oxide causes multiple sclerosis (MS). Also, the amount of manganese in the cerebrospinal fluid alters the metabolic reactions associated with MS. In this study, the mixture of the ammonium pyrrolidine dithiocarbonate (APDC), the hydrophobic ionic liquid [HMIM][PF6] and acetone coated on the surface of graphene oxide nanoparticles (GONPs) and used for separation Li and Mn in human samples by ultrasound assisted-dispersive-ionic liquid-micro-solid phase extraction technique (USA-DIL-μ-SPE) at pH 6.0. After extraction and back-extraction, the amount of lithium and manganese in the blood, serum and urine samples was determined by the flame and the graphite furnace atomic absorption spectroscopy (F-AAS, GF-AAS), respectively. By optimizing parameters, the LOD, Linear ranges (LR) and preconcentration factor (PF) for Li and Mn ions were obtained (0.03 mg L-1, 0.25 μg L-1), (0.1-0.4 mg L-1, 0.08-1.5 μg L-1) and 10, respectively (%RSD<5). The capacity adsorption of APDC/IL/GONPs and GONPs was achieved (148.5 mg g-1, 122.3 mg g-1) and (41.3 mg g-1, 33.7 mg g-1) for Li and Mn ions in a static system, respectively. This method was successfully validated by spiking samples and certified reference materials (CRM).","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78287368","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}
Pub Date : 2021-12-29DOI: 10.24200/amecj.v4.i04.153
Mahshid Gharagozlou, H. Sid Kalal, A. Khanchi, S. Ghorbanian, Seyed Ebrahim Mosavi, M. Almasian, Danial Niknafs, A. Pourmatin, N. Akbari
In this study, an attempt was made to recover vanadium from an alkaline solution using the precipitation process. A white salt ammonium metavanadate was obtained using the ammonium chloride precipitation method. Ammonium chloride was added directly to the alkaline liquor solution and the pH was adjusted approximately between 5 and 7 to form the white salt. The parameters affecting the recovery of vanadium, including the ammonium chloride concentration, the pH and the vanadium concentration in the caustic solution, were examined. The precipitation time had no significant influence on the vanadium recovery. The concentration of vanadium in the caustic solution and the concentration of ammonium chloride used for the precipitation were inversely related. It was found that a high recovery (over 90%) can be achieved with ammonium chloride and vanadium with concentrations over 4% (w / v) or 1000 mg L-1 (in the lye solution). It has also been observed that working in the pH range of 5 to 7 results in over 90% recovery. The influence of the parameters mentioned on the recovery of impurities was examined and the optimal values determined. Ultimately, the maximum vanadium recovery (97.29%) was achieved at the optimal point obtained from the reaction surface methodology.
本研究尝试用沉淀法从碱性溶液中回收钒。采用氯化铵沉淀法制备了白色偏氰酸铵盐。在碱液溶液中直接加入氯化铵，将pH值调整在5 ~ 7之间，形成白色盐。考察了氯化铵浓度、pH值和碱溶液中钒浓度对钒回收率的影响。沉淀时间对钒回收率无显著影响。碱溶液中钒的浓度与沉淀用氯化铵的浓度成反比。当氯化铵和钒浓度大于4% (w / v)或1000 mg L-1(碱液)时，回收率可达90%以上。还观察到，在pH值为5 ~ 7的范围内工作，回收率超过90%。考察了各参数对杂质回收率的影响，确定了最佳回收率。最终，在反应表面法得到的最佳点上，钒回收率达到了97.29%。
{"title":"Recovery of Vanadium by ammonium chloride precipitation method using response surface methodology","authors":"Mahshid Gharagozlou, H. Sid Kalal, A. Khanchi, S. Ghorbanian, Seyed Ebrahim Mosavi, M. Almasian, Danial Niknafs, A. Pourmatin, N. Akbari","doi":"10.24200/amecj.v4.i04.153","DOIUrl":"https://doi.org/10.24200/amecj.v4.i04.153","url":null,"abstract":"In this study, an attempt was made to recover vanadium from an alkaline solution using the precipitation process. A white salt ammonium metavanadate was obtained using the ammonium chloride precipitation method. Ammonium chloride was added directly to the alkaline liquor solution and the pH was adjusted approximately between 5 and 7 to form the white salt. The parameters affecting the recovery of vanadium, including the ammonium chloride concentration, the pH and the vanadium concentration in the caustic solution, were examined. The precipitation time had no significant influence on the vanadium recovery. The concentration of vanadium in the caustic solution and the concentration of ammonium chloride used for the precipitation were inversely related. It was found that a high recovery (over 90%) can be achieved with ammonium chloride and vanadium with concentrations over 4% (w / v) or 1000 mg L-1 (in the lye solution). It has also been observed that working in the pH range of 5 to 7 results in over 90% recovery. The influence of the parameters mentioned on the recovery of impurities was examined and the optimal values determined. Ultimately, the maximum vanadium recovery (97.29%) was achieved at the optimal point obtained from the reaction surface methodology.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83933848","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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