Activated carbon for efficiently treating chromium wastewater, and preparation method and application thereof
A technology of activated carbon and modification, which is applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problem of reduced chromium adsorption capacity, achieve wide pH universality, wide range of sources, and solve wastewater The effect of pH limitation
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Embodiment 1
[0037] Activation with 30 g / L of NaOH, the mass fraction of modified humic acid is 2 g / L, including the following steps:
[0038] S1, harvesting Ophiopogon japonicus at 105 o Dry at C for 24 h;
[0039] S2, placing the dried Ophiopogon japonicus in 30 g / L KOH for activation for 24 h;
[0040] S3, the activated Ophiopogon japonicus is taken out at 105 o Dry at C for 24 h;
[0041] S4, the dried Ophiopogon japonicus is placed in the muffle furnace with 8 o The heating rate of C / min is raised to 700 o C for carbonization and keep for 1 h;
[0042] S5. After natural cooling at room temperature, pickle with 0.1 mol / L hydrochloric acid, then wash with distilled water until the filtrate is neutral, filter the activated carbon and dry it at 105 o C to dry.
[0043] S6, modifying the prepared activated carbon with humic acid,
[0044] The specific steps are: add the dried activated carbon to 1% NaOH solution containing humic acid (mass fraction 2 g / L) and soak for 24 h. The mas...
Embodiment 2
[0047] Activation with 76 g / L of NaOH, the mass fraction of modified humic acid is 2 g / L, including the following steps:
[0048] S1, harvesting Ophiopogon japonicus at 105 o Dry at C for 24 h;
[0049] S2, placing the dried Ophiopogon japonicus in 76 g / L KOH for activation for 24 h;
[0050] S3, the activated Ophiopogon japonicus is taken out at 105 o Dry at C for 24 h;
[0051] S4, the dried Ophiopogon japonicus is placed in the muffle furnace with 10 o The heating rate of C / min is raised to 800 o C for carbonization and keep for 1 h;
[0052] S5, after natural cooling at room temperature, pickle with 0.1 mol / L hydrochloric acid, then wash with distilled water until the filtrate is neutral, filter the activated carbon and remove it at 105 o C to dry.
[0053] S6. Modify the prepared activated carbon with humic acid. The specific steps are: add the dried activated carbon to a 1% NaOH solution containing humic acid (mass fraction 2 g / L) and soak for 24 h. The mass rati...
Embodiment 3
[0055] Adsorption performance test of hexavalent chromium
[0056]Disperse 0.06 g of the product obtained in Example 1 in 200 mL of deionized water, mix and stir evenly, then add 0.056 g of potassium dichromate (Cr(VI) concentration is 100 mg / L), pH=1 ~ 5, stirred for 24 h, filtered to obtain the supernatant, measured the remaining content of chromate with an inductively coupled plasma spectrometer (ICP), and calculated the amount of chromate adsorbed by the adsorbent through conversion. The amount is 315 mg / g.
[0057] figure 2 For the isotherm of the activated carbon material prepared by the present invention to adsorb Cr(VI), the abscissa is the adsorption equilibrium concentration, and the ordinate is the adsorption amount. It can be seen from the figure that its maximum adsorption amount can reach 315 mg / g.
[0058] image 3 For the modified activated carbon prepared by the present invention, when there is or is not 100 mg / LCa (II) ion, to Cr (VI) adsorption situation...
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