LAUSR

Recent findings unfold that biomass materials with the micro/mesoporous structure were often treated as adsorbents for organic substances. In this work, one-step calcination method was adopted in the preparation of magnetic porous green bean biomass material. It has the properties of magnetism and porosity after the addition of Co(NO3 )2 and high temperature calcination. A variety of characterizations have been operated, including energy dispersive X-ray detector, vibrating sample magnetometer, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller analysis and so on. It has the specific surface area 168.1611 m2 ∙g-1 and the pore volumes 0.1764 cm3 ∙g-1 . The material was used in magnetic solid phase extraction of three polychlorinated biphenyls including 2-chlorobiphenyl, 4-chlorobiphenyl and 2,2,5-trichlorobiphenyl. Several factors were investigated, such as material amount, eluents, adsorption time, solution pH, salinity and the reusability. Under optimized conditions, good recoveries (90.24-93.34%) were achieved with the relative standard deviation in a range from 2.30 % to 4.83 %. Three real water samples (tap, river and lake water) were tested to verify the accuracy of the method. This method can be successfully used in the analysis of some polychlorinated biphenyls congeners in water. This article is protected by copyright. All rights reserved.