Spiny nanometer manganese dioxide/graphene composite material, and preparation method and application thereof
A technology of nano-manganese dioxide and composite materials, which is applied in the field of thorn-like nano-manganese dioxide/graphene composite materials, preparation and application, and can solve the problems of low treatment efficiency of colored liquid or turbid liquid, difficulty in desorption by adsorption method, etc. , to achieve the effect of rich yield, simple operation and convenient synthesis
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Embodiment 1
[0036] The application of a thorny nano-manganese dioxide / graphene composite material in the wastewater treatment containing antibiotics comprises the following steps:
[0037] Step 1. Preparation of spiny nano-manganese dioxide / graphene composite material
[0038] 1) Fully mix graphite powder, sodium nitrate and concentrated sulfuric acid, slowly add potassium permanganate under ice bath conditions, keep the mixed solution at 35°C for reaction, wait until the solution turns dark green, add 80mL deionized water, and turn to 90°C React in an oil bath at high temperature for 1 hour, and finally add deionized water and 6 mL of hydrogen peroxide to terminate the reaction, the solution turns brownish yellow, wash the solution with dilute hydrochloric acid and deionized water until neutral, freeze-dry to obtain graphene powder;
[0039] 2) First prepare 50mL isopropanol solution, then dissolve graphene oxide powder and manganese salt in isopropanol solution, control the molar concen...
Embodiment 2
[0052] The application of spiny nano manganese dioxide / graphene composite material in the norfloxacin antibiotic waste water of different pH value, comprises the following steps:
[0053] Take 5 water samples of a pharmaceutical wastewater, each water sample is 30mL, and the concentration of norfloxacin is 50mg / L. Nano-manganese dioxide / graphene composite material, 92 mg of potassium persulfate (PMS), reacted at 25 ° C, fully shaken in the shaker, sampled at a certain time interval, filtered, and detected the phenol in the aqueous solution The content of flufloxacin, the reaction times is 20min, finds that different initial pHs only have slight influence to the degradation effect of catalyst, can reach more than 86% to the degradation effect of norfloxacin (as Figure 7 ).
Embodiment 3
[0055] The stability test of spiny nano-manganese dioxide / graphene composite in the treatment of wastewater containing norfloxacin antibiotics includes the following steps:
[0056] In the water sample of 30mL of certain pharmaceutical wastewater containing norfloxacin concentration of 50mg / L, add 24mg of spiny nano-manganese dioxide / graphene composite material, then add 92mg of potassium persulfate (PMS), at 25 ℃ 、React under the condition of pH=7, fully shake in the shaker, and react for 20min;
[0057] After the reaction, the solution was cross-centrifuged and washed with water and ethanol, and the above experiment was repeated, and samples were taken and filtered at certain time intervals to detect the content of norfloxacin in the aqueous solution. The reaction time was 20 minutes. Still can keep degradation efficiency to reach 85% after four cycles of use (see Figure 8 ).
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