Eggshell heavy metal ion adsorbent and preparation method thereof
A technology of heavy metal ions and adsorbents, which is applied in the fields of waste resource utilization and water treatment, can solve problems such as environmental pollution, and achieve the effects of avoiding environmental pollution, increasing contact area, and strong adsorption capacity.
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[0015] Example 1
[0016] Take an eggshell, a waste from food production and daily life, for cleaning, and add it to a 20% NaOH solution to soak for 2 to 3 days to remove the inner membrane of the eggshell. Take out the eggshell, wash and filter, and then dry it in a drying cabinet. The eggshell with the inner membrane removed is placed in a heat treatment furnace and calcined at 750°C for 2 hours. After cooling, a powder with a fineness of 80-100 mesh can be obtained, that is, the eggshell heavy metal ion adsorbent.
[0017] Under the condition of 25℃, add 2.5g eggshell heavy metal ion adsorbent prepared in this example to 1 liter of acidic industrial wastewater (pH=3), heavy metal ion Cd 2+ , Pb 2+ , Cu 2+ , Ni 2+ Etc. completely adsorbed, Cr 3+ And Cr 2+ The adsorption rate is 80%. At the same time, the acidic industrial wastewater is neutralized, and the pH value of the wastewater after adsorption treatment is 7.
Example Embodiment
[0018] Example 2
[0019] Take an eggshell, a waste from food production and daily life, for cleaning, and add it to a 20% NaOH solution to soak for 2 to 3 days to remove the inner membrane of the eggshell. Take out the eggshell, wash and filter, and then dry it in a drying cabinet. The eggshell with the inner membrane removed is placed in a heat treatment furnace and calcined at 1000°C for 3 hours. After cooling, a powder with a fineness of 60-75 mesh can be obtained, that is, the eggshell heavy metal ion adsorbent.
[0020] Under the condition of 25℃, add 2.5g eggshell heavy metal ion adsorbent prepared in this example to 1 liter of acidic industrial wastewater (pH=3), heavy metal ion Cd 2+ , Pb 2+ , Cu 2+ , Ni 2+ Etc. completely adsorbed, Cr 3+ And Cr 2+ The adsorption rate of 82.5%. At the same time, the acidic industrial wastewater is neutralized, and the pH value of the wastewater after adsorption treatment is 7.
Example Embodiment
[0021] Example 3
[0022] Take an eggshell, a waste from food production and daily life, for cleaning, and add it to a 20% NaOH solution to soak for 2 to 3 days to remove the inner membrane of the eggshell. Take out the eggshell, wash and filter, and then dry it in a drying cabinet. The eggshell with the inner membrane removed is placed in a heat treatment furnace and calcined at 1200°C for 4 hours. After cooling, a powder with a fineness of 40-55 mesh can be obtained, that is, the eggshell heavy metal ion adsorbent.
[0023] Under the condition of 25℃, add 2g eggshell heavy metal ion adsorbent prepared in this example to 1 liter of acidic industrial wastewater (pH=3), heavy metal ion Cd 2+ , Pb 2+ , Cu 2+ , Ni 2+ Etc. completely adsorbed, Cr 3+ And Cr 2+ The adsorption rate is 85%. At the same time, the acidic industrial wastewater is neutralized, and the pH value of the wastewater after adsorption treatment is 7.
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