The Character Research Of The Etched Lattice Metal As Adsorption Material

Polycyclic aromatic hydrocarbons(PAHs)are one of the most widespread and the most harmful persistent organic pollutants.Due to its greatcarcinogenic,teratogenic and mutagenic effects,PAHs become an increasing threat to the ecological environment and human health.However,the content of PAHs in water is too low to detect,the sample pretreatment plays a key role.This paper aims at preparing high performance absorbent and improving the adsorption efficiency of the adsorbent.In charpt one,the SPME-GC analysis method was established using the home-made etched lattice stainless steel fiber as adsorbent for the analysis of six kinds of PAHs including biphenyl,acenaphthene,fluorine,phenanthrene,fluoranthene and pyrene in water.Firstly,home-made four electrodes electrochemical corrosion device was used to construct the lattice structure on the surface of stainless steel fiber.Then the stainless steel fiber was immersed in HF solution.The surface composition and structure of the adsorbent were characterized in detail using field emission SEM and EDS.The prepared material,which combined with the method of SPME-GC,was employed as an adsorbent for the pre-concentration of trace PAHs in water samples.The linear correlation coefficient was above 0.99.The limits of detection for the six kinds of analysis ranged from 0.02 μg/L to 0.17 μg/L.The precision ranged from 2.4% to 6.5%.This method was successfully applied to the analysis of samples with 86%-105% recoveries.In charpt two,the SPME-GC analysis method was built using the home-made etched scaly stainless steel fiber as adsorbent for the analysis of six kinds of PAHs in water.Home-made four electrodes electrochemical corrosion device was used in order to form the scaly structure on the surface of stainless steel fiber.Then the stainless steel fiber was immersed in HF solution.The surface composition and structure of the adsorbent were characterized in detail using field emission SEM and EDS.The prepared material,which combined with the method of SPME-GC,was employed as an adsorbent for the pre-concentration of trace PAHs in water samples.The linear correlation coefficient was above 0.99.The detection of limits for the six kinds of analysis ranged from 0.02 μg/L to 0.08 μg/L.The precision ranged from 2.4% to 6.5%.This method was successfully applied in the analysis of samples with 87%-110% recoveries.In charpt three,the SPME-HPLC analysis method was established based on the etched lattice stainless steel fiber as adsorbent.The PAHs adsorption process was completed using the home-made stainless steel fiber in the extraction bottle.Then,the steel fiber was put into the methanol solution for several minutes.At last,the sample solution was injected into the HPLC for the next detection.The linear correlation coefficient was above 0.99.The detection of limits for the six kinds of analysis ranged from 0.14 μg/L to 0.43 μg/L.The precision ranged from 2.9% to 7.9%.In charpt four,the SPME-GC analysis method was established using the home-made zeolitic imidazolate frameworks(ZIF-8)coating stainless steel fiber as adsorbent for the analysis of six kinds of PAHs.A zeolitic imidazolate framework(ZIF-8)crystal film coating was fabricated on the surface of the lattice stainless steel fiber by solvothermal reaction.The surface composition and structure of the adsorbent were characterized in detail using field emission SEM.The prepared material was used as an adsorbent for the pre-concentration of trace PAHs in water samples combined with the method of SPME-GC.The linear correlation coefficient was above 0.99.The detection of limits for the six kinds of analysis ranged from 0.05 μg/L to 0.23 μg/L.The precision ranged from 2.6% to 8.8%.This method was successfully applied in the analysis of samples with 83%-107% recoveries.