Adsorbent for uranium in uranium-containing wastewater and adsorption method for uranium-containing wastewater
An adsorbent and wastewater technology, which is applied in the field of adsorption treatment of uranium-contaminated water bodies, can solve the problems of unsatisfactory adsorption effect and low selectivity of uranium
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[0027] The application also provides a preparation method of calix [6] arene-modified magnetic graphene oxide, comprising:
[0028] Magnetic graphene oxide and calix[6]arene are esterified in a solvent under basic conditions to obtain magnetic graphene oxide modified by calix[6]arene.
[0029] The present invention utilizes calix[6]arene to modify magnetic graphene oxide, and forms an ester bond through the carboxyl group on the magnetic graphene oxide and the phenolic hydroxyl group on the lower edge of calix[6]arene to form an ester bond. ]Arenes grafted onto magnetic graphite oxide, so as to achieve the purpose of modification. The use of calix[6]arene to modify magnetic graphene oxide can reduce the aggregation of magnetic graphene oxide, and at the same time, graphene oxide has the characteristics of large specific surface area, rich oxygen-containing functional groups on the surface, stable chemical and mechanical properties, and calix[6]arene. 6]arenes have selective a...
Embodiment 1
[0056] The preparation of embodiment 1 adsorbent:
[0057] (1) Preparation of magnetic graphene oxide
[0058] Add 70ml of ethylene glycol and 0.5g of graphene oxide to a 250ml Erlenmeyer flask, and add 1.4g of FeCl after ultrasonication for 3 hours 3 ·6H 2 O and 2.8g of sodium acetate, then stirred for 30min; the mixed solution was transferred to an autoclave container, and reacted for 8h at 200°C. After natural cooling, the product was poured out and washed with ethanol and deionized water after solid-liquid separation by an external magnetic field. The solid product was dried several times in vacuum at 50° C. for 12 hours; the dried product was sealed and stored in a clean airtight bag.
[0059] (2) Preparation of magnetic graphene oxide modified by calix[6]arene
[0060] Measure 200ml of N,N-dimethylformamide into the Erlenmeyer flask, then add 100mg of magnetic graphene oxide and 400mg of calix[6]arene, stir at room temperature for 8h; then add 4ml of ammonia water (25...
Embodiment 2
[0062] Pipette 20 mL of uranium solution with an initial concentration of 1 mg / L into a 50 mL Erlenmeyer flask, adjust the pH of the solution to 3, 4, 5, 6, 7, 8, and 9 in sequence, and add 6 mg of magnetic The graphene oxide adsorbent and 6mg of the adsorbent prepared in the example were oscillatingly adsorbed in a constant temperature shaker at 20°C and the rotation speed was 150rpm, counted from the time when the adsorbent was added to the solution, and oscillatingly adsorbed for 300min to measure the concentration of uranium remaining therein. When the pH value is 3-9, the adsorption rates of magnetic graphene oxide are 1.8%, 14.79%, 32.50%, 78.53%, 82.22%, 80.74%, 69.27% respectively; the adsorption rates of MGO-C6 are 2.72%, 17.7%, 53.92%, 93.26%, 86.81%, 72.15%, 55.96%. It can be seen that the magnetic graphene oxide adsorbent has the largest adsorption rate when the pH is 7, and the maximum adsorption rate is 82.22%. The adsorbent prepared in Example 1 has the larges...
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