Method for removing complex-state lead by utilizing ferrous phosphate under anoxic condition
A ferrous phosphate, complex state technology, applied in chemical instruments and methods, oxidized water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of high degradation cost and impact
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Embodiment 1
[0023] Example 1: Fitting of ferrous phosphate to the adsorption capacity of EDTA-Pb under anoxic and aerobic conditions.
[0024] In this application, EDTA-Pb is first mixed with ethylenediaminetetraacetic acid and lead nitrate at a ratio of 1:1, and a 10mM EDTA-Pb stock solution is prepared under boiling conditions. In the experiment, 10, 30, 50, 70, 100, 200, 300, 400, 500mg / L EDTA-Pb was selected as the target pollutant to fit the isotherm, the EDTA-Pb stock solution was diluted to the preset value, and nitrogen gas was filled in the target contaminated solution for 10 minutes to achieve the target pollutant. Oxygen environment, then add ferrous phosphate at 1g / L, seal the Erlenmeyer flask, stay in the reactor for 1h, the temperature is 25±1°C, and the rotation speed is 250r / min. Another set of experiments was similar, and the process of filling nitrogen gas was removed. available from figure 1 It can be seen that the maximum adsorption capacity of ferrous phosphate has ...
Embodiment 2
[0025] Example 2: The removal effect of ferrous phosphate on EDTA-Pb under the inhibition of methanol in anoxic environment.
[0026] In this application, the selected initial concentration of EDTA-Pb is 300mg / L. Before adding ferrous phosphate after filling nitrogen, add a certain amount of methanol to remove possible hydroxyl radicals. In the process of removing EDTA-Pb with ferrous phosphate, due to the presence of Fe 2+ , may generate OH. Methanol was chosen as the masking agent for OH to explore whether OH was generated during this process. available from figure 2 It can be seen that EDTA-Pb can be removed relatively thoroughly without adding methanol, and the removal effect is inhibited to a certain extent after adding 10mM methanol, and the removal efficiency is only about 75%. After adding 50mM methanol, the removal efficiency is only 20%, which is equivalent to the removal effect under aerobic conditions, so it can be inferred that under anoxic conditions due to F...
Embodiment 3
[0027] Example 3: The removal effect of ferrous phosphate on lead in different complexed states.
[0028] There are a large number of different ligands in natural water bodies and industrial wastewater. This example studies the removal of lead in different complexed states by ferrous phosphate. The complexed Pb formed by common organic ligands and Pb is selected, the preparation method is consistent with that in Example 1, the initial concentration of complexed lead is selected as 50mg / L, and other operations are consistent with the batch processing in Example 1. From image 3 It can be seen that ferrous phosphate has a good removal effect on lead in various complex states, especially for carboxylic acids with strong binding capacity (such as DTPA), Pb can still be removed to 0.62mg / L. For lead citrate, it can even be removed below 0.1mg / L.
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