Preparation Of Graphene Oxide Functionalized Materials And Adsorption Of Organic Dyes In Water

The development of the society promotes the rapid development of the chemical industry,but the discharge of of industrial wastewater is also increased.Printing and dyeing organic dye wastewater is one of the main hazardous industrial wastewater.It is mainly derived from the dye and dye intermediates production industry.There are a lot of organic matters and salts in the organic dye wastewater.Its value of COD is very high,and with deep color,and strong acid-base value.This wastewater is very difficult to treat.Graphene oxide（GO）is a good two-dimensional adsorption material,which has many oxygen-containing ring energy groups on its surface and is easy to be modified.Three kinds of GO composites were synthesized and characterized by Fourier infrared spectroscopy（FTIR）,Raman spectroscopy（Raman）,X-ray photoelectron spectroscopy（XPS）,fully automatic specific surface area and aperture analyzer（BET）,X-ray Powder diffraction（XRD）and scanning electron microscopy（SEM）.The adsorption behavior and mechanism of three kinds of materials for different dyes were studied.The research contents are as follows:（1）A series of UiO-66-NH₂/GO composite materials were synthesized by hydrothermal method.The adsorption behavior and mechanism of UiO-66-NH₂/GO for chrome black T（EBT）organic dyes were explored.It was found that UiO-66-NH₂/GO-2 has the largest adsorption capacity of EBT,which was 263.158 mg/g,and the optimal adsorption conditions were:the initial concentration of EBT was 100 mg/L,the adsorption time was 80min,pH=1,the temperature was 45℃.UiO-66-NH₂/GO-2 has very good regeneration performance.The adsorption process conformed to the pseudo-second-order kinetic model,Langmuir isotherm model,and belonged to spontaneous endothermic reaction.（2）A new thiosemicarbazide functional GO composite（GO-TSC-GO）was prepared by the condensation reaction of thiosemicarbazide and GO.The adsorption behavior and mechanism of GO-TSC-GO for methylene blue（MB）organic dyes were explored.It was found that the maximum adsorption capacity of GO was 196.8 mg/g,however,the maximum adsorption capacity of GO-TSC-GO for MB was 596.6 mg/g,and the optimal adsorption conditions were:the initial concentration of MB was130 mg/L,adsorption time was 120 min,pH=10,temperature was 25℃.GO-TSC-GO has very good regeneration performance.The adsorption process conformed to the pseudo-second-order kinetic model,Langmuir isotherm model,and belonged to spontaneous exothermic reaction.（3）A novel thiosemicarbazide functional GO composite（GO-NPT）was prepared by condensation reaction of N-phenylthiourea with GO.The adsorption behavior and mechanism of GO-NPT for methyl orange（MO）organic dyes were explored.It was found that the maximum adsorption capacity of GO was 63.84 mg/g,and that of GO-NPT was 141.467 mg/g,the optimal conditions for adsorption were:the initial concentration of MO was 70 mg/L,the adsorption time was 100 min,pH=3,the temperature was30℃.GO-NPT has very good regeneration performance.The adsorption process conformed to the pseudo-second-order kinetic model,Langmuir isotherm model,and belonged to spontaneous exothermic reaction.