Selective Recognition of Ciprofloxacin from Aqueous Solution by Molecularly Imprinted Polymers Based on Magnetic Illite / 分析化学

The magnetic Illite ( MILT) was firstly prepared by an effective polyol-medium solvothermal method. Based on these 3-( methacryloyloxy) propyl trimethoxysilane ( MILT-MPS), magnetic molecularly imprinted polymers (MMIPs) were further synthesized via atom transfer radical polymerization in a mixture solution of methanol and deionized water. The as-prepared MMIIPs were characterized by FT-IR, TEM), XRD, TGA and vibrating sample magnetometer (VSM), and the results indicated that the MMIIPs exhibited magnetic sensitivity ( Ms =3. 866 emu / g ), thermal stability and a larger specific surface area (109. 58 m2 / g). The batch mode adsorption studies were carried out to investigate the recognition specificity and selective capacity. The Langmuir isotherm model was fitted to the equilibrium data, and the monolayer adsorption capacity of MMIPs at 25℃ was 86. 58 mg / g. The selective recognition experiments demonstrated high affinity and selectivity of MMIPs towards ciprofloxacin ( CIP) over competitive compounds. Combined with high performance liquid chromatographic analysis technology, the prepared MMIIPs were successfully applied to extract and enrich trace CIP in environmental samples with the CIP recoveries from 93. 4% to 98. 3% and the limit of detection of 0. 01 mg / L.

Output and Control of Nitrogen Oxides Produced by Household Ozone Generator as By-products / 环境与健康杂志

Objective To investigate the NOx(nitrogen oxides,esp.NO2) output of household ozone generator and the control method.Methods Ion chromatogram,pH detection and iodine titration were used to study the outputs of ozone and the by-product,NOx,generated by some certain household ozone generator in normal operation condition.The method of controlling NO2 simply by pure water absorption was also studied.Results At about 15 min,the ozone generator produced NO2 and turned into NO3-,the amount increased along with the operating time.After 60 min,the NO3-was almost in proportion to the operating time,the pH value decreased clearly.pH value was a proper and simple substitute parameter to display the generation and accumulation of NO2.NO2 could be efficiently controlled by pure water absorption.NO3-absorbed in a 0.1 mol/L NaOH solution was less than 0.01 mg/L after a pure water absorber which had an effective depth of 12cm,with little influence of ozone production.Conclusion NO2 will be generated inevitably and the amount of the by-product increases with the running time of the household ozone generator.Pure water absorption is efficient to control NO2 generation.