The study, conducted at the Research Farm of the College of Agriculture, University of Tabriz in 2021, focused on the effects of various nitrogen-fixing bacterial isolates, biofertilizers containing nitrogen and phosp...The study, conducted at the Research Farm of the College of Agriculture, University of Tabriz in 2021, focused on the effects of various nitrogen-fixing bacterial isolates, biofertilizers containing nitrogen and phosphorus, as well as iron and zinc foliar applications on mustard growth under rainfed conditions. The results indicated that biofertilizers, whether used alone or in combination with chemical fertilizers, produced comparable grain and oil outputs compared to chemical fertilizers alone. Additionally, the application of iron and zinc through foliar spraying significantly enhanced both grain and oil production. These findings suggest that integrating nitrogen-fixing bacteria and biofertilizers could reduce reliance on chemical nitrogenous fertilizers, leading to decreased production expenses, improved product quality, and minimized environmental impact. This study highlights the potential for sustainable agricultural practices in dry land farming as a viable alternative to traditional chemical-intensive methods. Substituting chemical nitrogenous fertilizers with nitrogen-fixing bacteria or biofertilizers could result in cost savings in mustard grain and oil production while promoting environmental sustainability.展开更多
The nanometer yellow iron oxide was prepared by oxidizing Fe（OH）2 with air, which was verified with XRD and TEM. The result shows that nanometer yellow iron oxide is spindle-shaped and well-distributed with a long a...The nanometer yellow iron oxide was prepared by oxidizing Fe（OH）2 with air, which was verified with XRD and TEM. The result shows that nanometer yellow iron oxide is spindle-shaped and well-distributed with a long axis of 150-200 nm and short axis of 40-50 nm. Ultraviolet （UV） transmittance of the iron oxide shows the great effect of concentration on both transparency and UV ab- sorption, and it has been proven that iron oxide with a concentration of 0.025wt% is preferred. The spectrum of XRD indicates that it is goethite. When the yellow iron is dispersed in sol, given that the wavelength of UV is less than 300 nm, its UV absorption capacity is superior to those of ZnO and TiO2. The absorption capacity of the yellow iron is less than TiO2 and more than ZnO as the wavelength of UV is 300-400 nm.展开更多
Treatment of yellow dye 23 by heterogeneous Fenton-like process was studied using iron rich soil as an iron source. The iron rich soil sample was characterized by XRD, SEM and BET analysis. XRD pattern indicates that ...Treatment of yellow dye 23 by heterogeneous Fenton-like process was studied using iron rich soil as an iron source. The iron rich soil sample was characterized by XRD, SEM and BET analysis. XRD pattern indicates that the iron rich soil is made of goethite and hematite. The reaction was systematically investigated under various experimental conditions such as pH, iron rich soil dosage, oxidant and dye concentrations. The result revealed that using iron rich soil as catalyst led to high discoloration efficiency (97.71% for 140 min of treatment) at pH = 2.5, 2 g/L iron rich soil and 16 m·mol/L H<sub>2</sub>O<sub>2</sub>. The degradation kinetics of acid yellow 23 can be described by a pseudo-first-order reaction following the Langmuir-Hinshelwood mechanism. The main roles of hydroxyl radicals in degradation process were investigated by adding of various radical scavengers.展开更多
我国制备氧化铁黄的原料大多以硫铁矿烧渣、钛白副产品硫酸亚铁、硫酸亚铁等分析纯试剂为主,存在杂质多、原料成本高、原料来源复杂等问题。试验采用超级铁精矿作为初始原料,通过酸溶-过滤-还原法制备硫酸亚铁,利用碳酸氢铵为沉淀剂,通...我国制备氧化铁黄的原料大多以硫铁矿烧渣、钛白副产品硫酸亚铁、硫酸亚铁等分析纯试剂为主,存在杂质多、原料成本高、原料来源复杂等问题。试验采用超级铁精矿作为初始原料,通过酸溶-过滤-还原法制备硫酸亚铁,利用碳酸氢铵为沉淀剂,通过氧化沉淀法制备氧化铁黄。试验表明在超级铁精矿(TFe:71.81%)、400 m L 4°Bé硫酸亚铁、初始pH为3.5、水浴温度为100℃、搅拌速度为500 r·min^(-1)、反应时间11 h等条件下,与GB/T 1863—2008各项指标数值作对比,铁含量高于国家标准1.07%,筛余物低于国家标准0.005%,105℃挥发物低于国家标准0.15%,总钙量低于国家标准0.248%。具有原料来源广、节能环保等优点,为制备高纯氧化铁黄提供新思路。展开更多
文摘The study, conducted at the Research Farm of the College of Agriculture, University of Tabriz in 2021, focused on the effects of various nitrogen-fixing bacterial isolates, biofertilizers containing nitrogen and phosphorus, as well as iron and zinc foliar applications on mustard growth under rainfed conditions. The results indicated that biofertilizers, whether used alone or in combination with chemical fertilizers, produced comparable grain and oil outputs compared to chemical fertilizers alone. Additionally, the application of iron and zinc through foliar spraying significantly enhanced both grain and oil production. These findings suggest that integrating nitrogen-fixing bacteria and biofertilizers could reduce reliance on chemical nitrogenous fertilizers, leading to decreased production expenses, improved product quality, and minimized environmental impact. This study highlights the potential for sustainable agricultural practices in dry land farming as a viable alternative to traditional chemical-intensive methods. Substituting chemical nitrogenous fertilizers with nitrogen-fixing bacteria or biofertilizers could result in cost savings in mustard grain and oil production while promoting environmental sustainability.
基金This work was financially supported by the Construct Plan of Cooperation Project from the Beijing Education Committee (No.XK100080432).
文摘The nanometer yellow iron oxide was prepared by oxidizing Fe（OH）2 with air, which was verified with XRD and TEM. The result shows that nanometer yellow iron oxide is spindle-shaped and well-distributed with a long axis of 150-200 nm and short axis of 40-50 nm. Ultraviolet （UV） transmittance of the iron oxide shows the great effect of concentration on both transparency and UV ab- sorption, and it has been proven that iron oxide with a concentration of 0.025wt% is preferred. The spectrum of XRD indicates that it is goethite. When the yellow iron is dispersed in sol, given that the wavelength of UV is less than 300 nm, its UV absorption capacity is superior to those of ZnO and TiO2. The absorption capacity of the yellow iron is less than TiO2 and more than ZnO as the wavelength of UV is 300-400 nm.
文摘Treatment of yellow dye 23 by heterogeneous Fenton-like process was studied using iron rich soil as an iron source. The iron rich soil sample was characterized by XRD, SEM and BET analysis. XRD pattern indicates that the iron rich soil is made of goethite and hematite. The reaction was systematically investigated under various experimental conditions such as pH, iron rich soil dosage, oxidant and dye concentrations. The result revealed that using iron rich soil as catalyst led to high discoloration efficiency (97.71% for 140 min of treatment) at pH = 2.5, 2 g/L iron rich soil and 16 m·mol/L H<sub>2</sub>O<sub>2</sub>. The degradation kinetics of acid yellow 23 can be described by a pseudo-first-order reaction following the Langmuir-Hinshelwood mechanism. The main roles of hydroxyl radicals in degradation process were investigated by adding of various radical scavengers.
文摘我国制备氧化铁黄的原料大多以硫铁矿烧渣、钛白副产品硫酸亚铁、硫酸亚铁等分析纯试剂为主,存在杂质多、原料成本高、原料来源复杂等问题。试验采用超级铁精矿作为初始原料,通过酸溶-过滤-还原法制备硫酸亚铁,利用碳酸氢铵为沉淀剂,通过氧化沉淀法制备氧化铁黄。试验表明在超级铁精矿(TFe:71.81%)、400 m L 4°Bé硫酸亚铁、初始pH为3.5、水浴温度为100℃、搅拌速度为500 r·min^(-1)、反应时间11 h等条件下,与GB/T 1863—2008各项指标数值作对比,铁含量高于国家标准1.07%,筛余物低于国家标准0.005%,105℃挥发物低于国家标准0.15%,总钙量低于国家标准0.248%。具有原料来源广、节能环保等优点,为制备高纯氧化铁黄提供新思路。
