In this study,the platinum(Pt)levels in environmental samples(soil,water,dust)collected from heavily trafficked streets in the city center of Siirt were determined using ICP-MS(Inductively Coupled Plasma Mass Spectrom...In this study,the platinum(Pt)levels in environmental samples(soil,water,dust)collected from heavily trafficked streets in the city center of Siirt were determined using ICP-MS(Inductively Coupled Plasma Mass Spectrometry).The results obtained were compared with the platinum levels in environmental samples collected from rural areas.A total of 20 samples(10 soil and 10 dust)were collected from streets with heavy traffic in the center of Siirt.These samples were digested using microwave-assisted digestion and then analyzed for platinum content by ICP-MS.For determining platinum concentrations at very low levels in environmental samples,ICP-OES(Inductively Coupled Plasma Optical Emission Spectroscopy)or GF-AAS(Graphite Furnace Atomic Absorption Spectroscopy)could be used;however,prior enrichment is recommended in these cases due to the higher detection limits of these instruments compared to ICP-MS.To facilitate enrichment,a SPE(Solid-Phase Extraction)method was studied.For this purpose,a column was prepared using Amberlite XAD-4 as the adsorbent and the bacterium Aneurinibacillus thermoaerophilus VO-12 as a biosorbent,which was then used for the pre-concentration of platinum from environmental samples.Optimization of certain parameters,such as pH and flow rate,for the SPE process was carried out,and the most suitable conditions were identified.Platinum levels in samples collected from both the city center and rural areas were determined using the developed method.The accuracy of the method was validated by using the BCR-723 certified reference material.展开更多
Pt-based nanocatalysts offer excellent prospects for various industries.However,the low loading of Pt with excellent performance for efficient and stable nanocatalysts still presents a considerable challenge.In this s...Pt-based nanocatalysts offer excellent prospects for various industries.However,the low loading of Pt with excellent performance for efficient and stable nanocatalysts still presents a considerable challenge.In this study,nanocatalysts with ultralow Pt content,excellent performance,and carbon black as support were prepared through in-situ synthesis.These~2-nm particles uniformly and stably dispersed on carbon black because of the strong s-p-d orbital hybridizations between carbon black and Pt,which suppressed the agglomeration of Pt ions.This unique structure is beneficial for the hydrogen evolution reaction.The catalysts exhibited remarkable catalytic activity for hydrogen evolution reaction,exhibiting a potential of 100 mV at 100 mA·cm^(-2),which is comparable to those of commercial Pt/C catalysts.Mass activity(1.61 A/mg)was four times that of a commercial Pt/C catalyst(0.37 A/mg).The ultralow Pt loading(6.84wt%)paves the way for the development of next-generation electrocatalysts.展开更多
Pt（Ⅳ） was quantitatively adsorbed by D301R resin in the medium of pH = 3.47. The statically saturated adsorption capacity is 410 mg/g. Pt（Ⅳ） adsorbed on D301R resin can be eluted by 1.0-2.0 mol/L NaOH. The rate ...Pt（Ⅳ） was quantitatively adsorbed by D301R resin in the medium of pH = 3.47. The statically saturated adsorption capacity is 410 mg/g. Pt（Ⅳ） adsorbed on D301R resin can be eluted by 1.0-2.0 mol/L NaOH. The rate constant is k298 = 5.43 × 10^-5 s^-1. The adsorption of Pt（Ⅳ） on D301R resin obeys the Freundlich isotherm. The adsorption parameters of thermodynamics are as follows： enthalpy change AH = 4.37 kJ/mol, Gibbs free energy change AG = -5.39 kJ/mol, and entropy change AS = 32.76 J/（mol.K）. The apparent activation energy is Ea = 22.5 kJ/mol. The coordination molar ratio of the functional group of D301R resin to Pt（Ⅳ） is 2：1.展开更多
Cloud point extraction (CPE) with Tergitol TMN-6 was applied for the extraction of trace amounts of palladium (Pd(Ⅱ)), platinum (Pt(Ⅳ)), and gold (Au(Ⅲ)) in the soil of industrial sewage. Ammonium pyrolysine dithio...Cloud point extraction (CPE) with Tergitol TMN-6 was applied for the extraction of trace amounts of palladium (Pd(Ⅱ)), platinum (Pt(Ⅳ)), and gold (Au(Ⅲ)) in the soil of industrial sewage. Ammonium pyrolysine dithiocarbamate (APDC) was adopted as the chelating agent prior to CPE and then was detected by atomic absorption spectrometry (AAS). Different parameters such as the concentration of surfactants, chelating agent and salt, sample pH, equilibration temperature and time, centrifugation time and rates, and the effect of foreign ions were studied. Under optimum conditions, the low limits of detections are 1.4, 2.8 and 1.2 ng·ml^-1 and the enrichment factors are 21, 12, and 24 for Pd(Ⅱ), Pt(Ⅳ), and Au(Ⅲ, respectively. The relative standard deviations vary from 0.6% to 1.0% (n=11). All correlation coefficients of the calibration curves are >0.9960. The proposed method was successfully applied for the determination of Pd(Ⅱ), Pt(Ⅳ), and Au(Ⅲ) in the real soil of industrial sewage samples.展开更多
基金Siirt University for their support in the project with the reference number 2015-SİÜMYO-27.
文摘In this study,the platinum(Pt)levels in environmental samples(soil,water,dust)collected from heavily trafficked streets in the city center of Siirt were determined using ICP-MS(Inductively Coupled Plasma Mass Spectrometry).The results obtained were compared with the platinum levels in environmental samples collected from rural areas.A total of 20 samples(10 soil and 10 dust)were collected from streets with heavy traffic in the center of Siirt.These samples were digested using microwave-assisted digestion and then analyzed for platinum content by ICP-MS.For determining platinum concentrations at very low levels in environmental samples,ICP-OES(Inductively Coupled Plasma Optical Emission Spectroscopy)or GF-AAS(Graphite Furnace Atomic Absorption Spectroscopy)could be used;however,prior enrichment is recommended in these cases due to the higher detection limits of these instruments compared to ICP-MS.To facilitate enrichment,a SPE(Solid-Phase Extraction)method was studied.For this purpose,a column was prepared using Amberlite XAD-4 as the adsorbent and the bacterium Aneurinibacillus thermoaerophilus VO-12 as a biosorbent,which was then used for the pre-concentration of platinum from environmental samples.Optimization of certain parameters,such as pH and flow rate,for the SPE process was carried out,and the most suitable conditions were identified.Platinum levels in samples collected from both the city center and rural areas were determined using the developed method.The accuracy of the method was validated by using the BCR-723 certified reference material.
基金financially supported by the National Natural Science Foundation of China(No.5217042069)the Young Elite Scientist Sponsorship Program by China Association for Science and Technology(CAST)(No.YESS20200103)the Fundamental Research Funds for the Central Universities(No.265QZ2022004)。
文摘Pt-based nanocatalysts offer excellent prospects for various industries.However,the low loading of Pt with excellent performance for efficient and stable nanocatalysts still presents a considerable challenge.In this study,nanocatalysts with ultralow Pt content,excellent performance,and carbon black as support were prepared through in-situ synthesis.These~2-nm particles uniformly and stably dispersed on carbon black because of the strong s-p-d orbital hybridizations between carbon black and Pt,which suppressed the agglomeration of Pt ions.This unique structure is beneficial for the hydrogen evolution reaction.The catalysts exhibited remarkable catalytic activity for hydrogen evolution reaction,exhibiting a potential of 100 mV at 100 mA·cm^(-2),which is comparable to those of commercial Pt/C catalysts.Mass activity(1.61 A/mg)was four times that of a commercial Pt/C catalyst(0.37 A/mg).The ultralow Pt loading(6.84wt%)paves the way for the development of next-generation electrocatalysts.
基金This project was financially supported by the Natural Science Foundation of Zhejiang Province, China （No. 200072）.
文摘Pt（Ⅳ） was quantitatively adsorbed by D301R resin in the medium of pH = 3.47. The statically saturated adsorption capacity is 410 mg/g. Pt（Ⅳ） adsorbed on D301R resin can be eluted by 1.0-2.0 mol/L NaOH. The rate constant is k298 = 5.43 × 10^-5 s^-1. The adsorption of Pt（Ⅳ） on D301R resin obeys the Freundlich isotherm. The adsorption parameters of thermodynamics are as follows： enthalpy change AH = 4.37 kJ/mol, Gibbs free energy change AG = -5.39 kJ/mol, and entropy change AS = 32.76 J/（mol.K）. The apparent activation energy is Ea = 22.5 kJ/mol. The coordination molar ratio of the functional group of D301R resin to Pt（Ⅳ） is 2：1.
基金supported by the National Natural Science Foundation of China(No.20961012)the Medical Neurobiology Key Laboratory of Kunming University of Science and Technology,Basic and Applied Research Project in Yunnan Province(No.2008ZC082M)+3 种基金the Analysis and Testing Foundation of Kunming University of Science and Technology(No.2010121)Innovation Fund for Smalland Medium Technology Based Firms(No.11C26215305936)Natural and Science Foundation of Yunnan Province(No.2010ZC027)Focus Fund of Department of Education in Yunnan Province(No.2010Z016)
文摘Cloud point extraction (CPE) with Tergitol TMN-6 was applied for the extraction of trace amounts of palladium (Pd(Ⅱ)), platinum (Pt(Ⅳ)), and gold (Au(Ⅲ)) in the soil of industrial sewage. Ammonium pyrolysine dithiocarbamate (APDC) was adopted as the chelating agent prior to CPE and then was detected by atomic absorption spectrometry (AAS). Different parameters such as the concentration of surfactants, chelating agent and salt, sample pH, equilibration temperature and time, centrifugation time and rates, and the effect of foreign ions were studied. Under optimum conditions, the low limits of detections are 1.4, 2.8 and 1.2 ng·ml^-1 and the enrichment factors are 21, 12, and 24 for Pd(Ⅱ), Pt(Ⅳ), and Au(Ⅲ, respectively. The relative standard deviations vary from 0.6% to 1.0% (n=11). All correlation coefficients of the calibration curves are >0.9960. The proposed method was successfully applied for the determination of Pd(Ⅱ), Pt(Ⅳ), and Au(Ⅲ) in the real soil of industrial sewage samples.
