Magnetic Fe3O4 nanospheres with a average diameter of （201±0.5） nm were synthesized at 200℃ via a solvothermal method. The as-synthesized Fe3O4 nanospheres performed an efficiency in the Fenton degradation of ...Magnetic Fe3O4 nanospheres with a average diameter of （201±0.5） nm were synthesized at 200℃ via a solvothermal method. The as-synthesized Fe3O4 nanospheres performed an efficiency in the Fenton degradation of xylenol orange with a degradation rate of 90%-95%. Additionally, the catalyst was easily recyclable and the recovery rate was greater than 90%. Moreover, the catalyst could be regenerated under an ultrasonic treatment, and the degradation performance remained essentially the same. More importantly, the degradation rate varied with respect to the amount of H2O2 and the pH of the best reaction process. And the reaction efficiency was achieved with 1.5 mL of H2O2 in an acidic environment.展开更多
The aim of this work is to study the heterogeneous oxidative degradation of ofloxacin antibiotic using a composite material prepared from sodium alginate and cyclohexane dinitrilo tetraacetic acid（CDTA）. The charact...The aim of this work is to study the heterogeneous oxidative degradation of ofloxacin antibiotic using a composite material prepared from sodium alginate and cyclohexane dinitrilo tetraacetic acid（CDTA）. The characterization tests indicated the successful incorporation of metal chelator and iron. It was also demonstrated that the synthesized beads are mesoporous. The influence of several experimental parameters（i.e.： H2O2 dose,working temperature, beads loading and initial drug concentration） on the process performances was evaluated. The reaction temperature significantly affects the drug conversion efficiency. It was also observed that the synthesized material was efficient toward the target antibiotic degradation in the presence of small quantities of hydrogen peroxide. Under optimum conditions（0.05 g of granules, initial drug concentration = 10 mg/L,25 μL of 10 mmol/L H2O2）, conducted in a batch reaction, 94% degradation of ofloxacin was reached. The results also indicate that the composite material showed a reasonable stability;a relatively low decrease of activity after four successive runs（only 9%） and a negligible iron leaching（0.8%） have been observed. The synthesized composite material offered interesting advantages in terms of simplicity, good stability, ease of recovery from the liquid medium after use and its efficiency in the presence of low quantities of oxidant. It constitutes a good candidate in the water treatment area.展开更多
基金Supported by the National Natural Science Foundation of China（No.31400497）, the Fundamental Research Funds for the Central Universities, China（No.2572017BB14）, the Heilongjiang Postdoctoral Financial Assistance, China（No.LBH-Z13001）, the General Financial Grant from the China Postdoctoral Science Foundation, China（No.2014M561311） and the Open Project of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, China（No.2016-24）.
文摘Magnetic Fe3O4 nanospheres with a average diameter of （201±0.5） nm were synthesized at 200℃ via a solvothermal method. The as-synthesized Fe3O4 nanospheres performed an efficiency in the Fenton degradation of xylenol orange with a degradation rate of 90%-95%. Additionally, the catalyst was easily recyclable and the recovery rate was greater than 90%. Moreover, the catalyst could be regenerated under an ultrasonic treatment, and the degradation performance remained essentially the same. More importantly, the degradation rate varied with respect to the amount of H2O2 and the pH of the best reaction process. And the reaction efficiency was achieved with 1.5 mL of H2O2 in an acidic environment.
基金supported by the Tunisian Ministry of Higher Education and Scientific Research
文摘The aim of this work is to study the heterogeneous oxidative degradation of ofloxacin antibiotic using a composite material prepared from sodium alginate and cyclohexane dinitrilo tetraacetic acid（CDTA）. The characterization tests indicated the successful incorporation of metal chelator and iron. It was also demonstrated that the synthesized beads are mesoporous. The influence of several experimental parameters（i.e.： H2O2 dose,working temperature, beads loading and initial drug concentration） on the process performances was evaluated. The reaction temperature significantly affects the drug conversion efficiency. It was also observed that the synthesized material was efficient toward the target antibiotic degradation in the presence of small quantities of hydrogen peroxide. Under optimum conditions（0.05 g of granules, initial drug concentration = 10 mg/L,25 μL of 10 mmol/L H2O2）, conducted in a batch reaction, 94% degradation of ofloxacin was reached. The results also indicate that the composite material showed a reasonable stability;a relatively low decrease of activity after four successive runs（only 9%） and a negligible iron leaching（0.8%） have been observed. The synthesized composite material offered interesting advantages in terms of simplicity, good stability, ease of recovery from the liquid medium after use and its efficiency in the presence of low quantities of oxidant. It constitutes a good candidate in the water treatment area.
