A kind of method that modified bentonite prepares heavy metal particle adsorbent
A particle adsorbent, bentonite technology, applied in the directions of alkali metal compounds, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problems of large losses, high costs, application limitations, etc. Simple preparation process
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Embodiment 1
[0032] Take 1g each of natural bentonite powder and activated carbon powder screened through a 100-mesh sieve, and add 30mL Cu 2+ or Zn 2+ Concentration is 100mg / L simulated heavy metal wastewater solution, after testing, 100mg / L simulated Cu 2+ Wastewater solution and Zn 2+ The pH values of the wastewater solutions were 4.1 and 5.4, respectively. Then the heavy metal adsorption test was carried out. Place the sealed centrifuge tube in a constant temperature oscillator, under the conditions of temperature (25 ± 1) ℃, rotation speed 200 r / min, constant temperature oscillation reaction 5min-24h, centrifuge at 4000r / min for 10min in a centrifuge, take the The supernatant was passed through a 0.45 μm microporous membrane to test the concentration of heavy metals. The results are shown in Table 1. After adsorption by natural bentonite powder and activated carbon powder, Cu in the residual solution 2+ The concentrations were 9.58mg / L and 10.33 mg / L, and the removal rates reac...
Embodiment 2
[0036] Use natural bentonite as the raw material, roughen the natural bentonite, dry, pulverize and pass through a 100-mesh sieve after roughing; the montmorillonite mineral component in the bentonite after roughing is ≥ 50.0%, and its chemical composition is Al 2 o 3 ≥15.0%, Fe 2 o 3 ≥5.6%, MgO≥1.5%, moisture content less than 10%.
[0037] Take 1g of the above-screened natural bentonite powder in multiple groups of 100mL centrifuge tubes, add 30mL of Cu 2+ or Zn 2+ The concentration is 5-200mg / L to simulate the heavy metal wastewater solution, and carry out the heavy metal adsorption test. Place the sealed centrifuge tube in a constant temperature oscillator, under the conditions of temperature (25 ± 1) ℃, rotation speed 200 r / min, constant temperature oscillation reaction 5min-24h, centrifuge at 4000r / min for 10min in a centrifuge, take the The supernatant was passed through a 0.45 μm microporous membrane to test the concentration of heavy metals. The result is as f...
Embodiment 3
[0041] Use natural bentonite as the raw material, roughen the natural bentonite, dry, pulverize and pass through a 100-mesh sieve after roughing; the montmorillonite mineral component in the bentonite after roughing is ≥ 50.0%, and its chemical composition is al 2 o 3 ≥15.0%, Fe 2 o 3 ≥5.6%, MgO≥1.5%, moisture content less than 10%.
[0042] Take 10 g of the above-mentioned bentonite after sieving respectively in a round bottom flask, add 100 mL of hydrochloric acid with a concentration of 0.5 mol / L, 1.0 mol / L, 2.0 mol / L and 3.0 mol / L respectively, and put it in a water bath constant temperature oscillator, Heating and shaking in a water bath at 80°C for 4h. After heating and shaking, cool and centrifuge, wash with deionized water until neutral, dry, and pulverize. Take 1g of acid-modified bentonite adsorbents with different concentrations in multiple 100mL centrifuge tubes, add 30mL Cu 2+ or Zn 2+ The concentration is 200 mg / L to simulate the heavy metal wastewater solut...
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