| Adsorption is an effective method for separating and recovering organic contaminants from high-salt organic wastewater.Therefore,it is of great significance to develop adsorbents with high adsorption capacity and selectivity.The macroporous resin is one of the most feasible and environmentally friendly materials due to the advantages of good stablility,high separation efficiency,economy,and no secondary pollution.Nanosized copper oxyhydroxide,iron oxyhydroxide and zero-valent iron were combined on the surface of the macroporous resin using chemical coprecipitation method and different modified resins?FeCuD301,CuD201,and Fe0D201?were obtained.The structure,morphology,crystal phase and elemental composition of the modified resins were characterized using Fourier transform infrared spectroscopy?FR-IR?,scanning electron microscopy?SEM?,transmission electron microscopy?TEM?and X-ray diffraction?XRD?.With pH=3,298 K and initial 400 mg·L-1concentration of glyphosate,the adsorption capacity of FeCuD301 can reach 343.6mg·g-1.The adsorption capacity of CuD201 increased with the increasing of copper content and temperature.At pH 6,the adsorption capacity of CuD201 was 182.2mg·g-1.The adsorption capacity of FeCuD301 and CuD201 resin is around 142 mg·g-1in the presence 18%NaCl.It was found that the adsorption kinetics were well fitted by a pseudo-second-order model and the equilibrium adsorption was well described with Langmuir model.The presence of humic acid and fulvic acid decreased the adsorption capacity of FeCuD301 and D201Cu to glyphosate under the tested conditions.The removal of glyphosate was investigated using nanoscale zero-valent iron supported D201?Fe0D201?as a catalyst based on Fenton-like oxidation method.The effects of pH,temperature,time and coexisting ions on the removal efficiency were investigated.The removal efficiency was over 98%after 1.5 hour on conditions:pH=5,initial 50 mg·L-1glyphosate and 170 mg·L-1hydrogen peroxide at 55?. |
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