In this study, magnetite nanoparticles, chitosan, and a hybrid composite of magnetite/ chitosan were prepared through a simple method. The prepared materials were characterized via Fourier transform infrared spectroscopy, X-ray diffraction, Vibrating sample magnetometer, Laser diffraction particle size analyzer, and Zeta potential. Then, the adsorption capacity of these materials for 2,4-Dichlorophenoxyacetic acid (2,4-D) and chrysoidine removal were also determined in the same condition. Prepared materials have the ability to adsorb selectivity with 2,4-D and chrysoidine. There results show the potential application of hybrid composite magnetite/chitosan in developing efficient adsorbent in low cost in the field of environmental treatment.

In this study, graphene oxide was prepared by the modified Hummers method, and then iron oxide nanoparticles were deposited on the surface of graphene oxide by hydrothermal method. After synthesis, these materials were characterized via a number of physical methods: X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), vibrating sample magnetometer (VSM) and scanning electron microscopy (SEM/EDX). The results show that the iron oxide particles were synthesized with nano-size, and the material after modified by graphene oxide still retains the magnetism. These materials continue to be evaluated the for removing methylene blue and Congo red in the water. The results show that the synthesized composite materials can selectively adsorb methylene blue and Congo red, thereby showing the potential application of magnetic composite materials in the field of wastewater treatment.

This study used liquid - liquid extraction (LLE) and liquid chromatography Triple Quadrupole Tandem Mass Spectrometry (LC/MS/MS) Agilent 6430 Triple Quad to survey and assessment PFOS contamination in water. The optimistical conditions are: Product ion is m/z = 80 for quantification and m/z = 98.9 to qualifier; collision energy (CE) is 80V, mobile phase is 80% methanol and 20% amonium acetate 5mM. Base on these conditions, PFOS in 1.0 L water is determined by LLE three times with 100 ml DCM. This process has LOD = 0.2 ng/L; LOQ = 1 ng/L; RSD < 21% and recovery > 80%. The results are suitable to requirements of AOAC to analyse PFOS in water samples.