A kind of fe-mn system adsorbent and its preparation and application method
An adsorbent, fe-mn technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem of lack of adsorbents, etc., to achieve enhanced adsorption effect, enhanced adsorption performance, and huge surface activation Can effect
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Embodiment 1
[0031] Prepare Fe-Mn system adsorbent of the present invention:
[0032] (1) Weigh a total of 30 g of elemental iron powder and manganese dioxide according to a mass ratio of 5:1.
[0033] (2) Add the raw materials in step (1) and 300ml of water into a 500ml stainless steel ball mill tank, and ball mill for 3 hours under the conditions of a ball-to-material ratio of 20:1 and a ball mill speed of 500r / min.
[0034] (3) The product in (2) is taken out, and its pH is adjusted to 5 with 10% sulfuric acid solution.
[0035] (4) Ultrasonic disperse the mixture in (3) for 20 minutes, and then leave it to age for 10 hours.
[0036] (5) The product in (4) was filtered and washed three times with 95% alcohol, then dried at 50° C., ground and passed through a 100-mesh sieve to obtain an adsorbent.
Embodiment 2
[0038] In this example, the treatment object is the sodium arsenate solution prepared in the laboratory. The concentration of arsenic was 1g / L, and the pH was adjusted to 6. Add 0.10 g of the adsorbent prepared in Example 1 to each Erlenmeyer flask, then add 100 ml of sodium arsenate solution with adjusted pH, shake on a shaker at room temperature, and take the supernatant for detection every 1 hour. The results showed that the concentration of arsenic in the solution after treatment decreased gradually with the increase of time, and the concentration of arsenic tended to be stable when T=5h. Arsenic content measured per hour: 950mg / L, 922.4mg / L, 902.2mg / L, 880.1.0mg / L, 860.0mg / L, 859.1mg / L, 858.3mg / L, the adsorption capacity is 50mg / L respectively g, 77.6mg / g, 97.8mg / g, 119.9mg / g, 140mg / g, 140.9mg / g, 141.7mg / g.
Embodiment 3
[0040] The arsenic-containing wastewater used in the experiment comes from a smelter plant's sulfidation and arsenic precipitation wastewater. The arsenic-containing wastewater is acidic, and its heavy metal concentration is shown in Table 1. In this example, add 1.0 g of the adsorbent prepared in Example 1 to the Erlenmeyer flask, then add 100 ml of arsenic-containing waste liquid, shake it on a shaker at room temperature for 5 hours, remove it and let it stand, and take the supernatant for detection. The results showed that the concentration of arsenic in the arsenic-containing waste liquid decreased from 1859 mg / L to 652.4 mg / L, and the adsorption capacity of arsenic was 120.7 mg / g. The concentration of lead decreased from 139.3mg / L to 29.1mg / L, and the adsorption capacity of lead was 11.02mg / g.
[0041] Table 1 Concentration of main heavy metals in wastewater (mg / L)
[0042] the element
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