Method for adsorption treatment of uranium-containing wastewater through using iron modified attapulgite adsorbent
A technology of attapulgite and adsorbent, which is applied in the field of iron-modified attapulgite adsorbent to treat uranium-containing wastewater. It can solve the problems of complicated preparation process and many types of raw materials, and achieve strong economy, simple operation process and good economy. and environmental benefits
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Embodiment 1
[0054] Weigh 5g of the purified attapulgite into a 500mL beaker, add 250mL of distilled water, stir magnetically for 0.5h, then add 0.724g of FeCl 3 ·6H 2 O (equivalent to 0.15gFe), magnetic stirring for 30min, to ensure that FeCl 3 ·6H 2 O was completely dissolved, adjusted to pH=7, continued to stir for 1 hour, centrifuged and washed 3 times, dried at 40°C for 36-48 hours, and ground to 100 mesh to prepare iron-modified attapulgite adsorbent. The content of iron element in this adsorbent is 5.66% by weight.
[0055] Accurately weigh 1.5000g (±0.0005g) of the iron-modified attapulgite adsorbent, place it in a 250mL conical flask with a stopper, add 30mL of uranyl nitrate solution with a concentration of 100mg / L, and place it in a constant temperature oscillator , oscillating at a rate of 150r / min at a temperature of 25°C, at this time the mass ratio of uranium to adsorbent in uranium-containing wastewater is 1:500. The supernatants were taken at 0.5h, 1h, 3h, 6h, 6h, 24h,...
Embodiment 2
[0059] The iron-modified attapulgite adsorbent was prepared in the same manner as in Example 1.
[0060] Accurately weigh 0.5000g (±0.0005g) of the iron-modified attapulgite adsorbent, place it in a 250mL conical flask with a stopper, add 10mL of uranyl nitrate solutions with concentrations of 10, 20, 50, and 100 mg / L respectively , placed in a constant temperature oscillator, oscillating at a rate of 150r / min at a temperature of 25°C for 24h to adsorption equilibrium, at this time the mass ratios of uranium and adsorbent in uranium-containing wastewater are 1:5000, 1:2500, 1: 1000, 1:500. The supernatant was taken to test the concentration of residual uranium with an inductively coupled plasma emission spectrometer (ICP-AES). Three groups of parallel experiments were set for each experiment. The results were expressed as arithmetic mean values and standard deviations were calculated to ensure test accuracy. After calculation, the adsorption and removal rates of uranium are...
Embodiment 3
[0063] The iron-modified attapulgite adsorbent was prepared in the same manner as in Example 1.
[0064] Accurately weigh 0.5000g (±0.0005g) of the iron-modified attapulgite adsorbent, put it in a 250mL conical flask with a stopper, add 10mL of uranyl nitrate solution with a concentration of 100mg / L, and place it in a constant temperature oscillator , at 5, 15, 25, and 40°C, oscillating at a rate of 150r / min for 24h to adsorption equilibrium, at this time, the mass ratio of uranium to adsorbent in uranium-containing wastewater is 1:500. The supernatant was taken to test the concentration of residual uranium with an inductively coupled plasma emission spectrometer (ICP-AES). Three groups of parallel experiments were set for each experiment. The results were expressed as arithmetic mean values and standard deviations were calculated to ensure test accuracy. After calculation, the adsorption and removal rates of uranium were 93.7%, 95.3%, 99.5%, and 97.4%, respectively. attach...
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