A high-efficiency adsorption of heavy metal ions cd 2+ Dissolved organic matter impregnated biochar and its preparation method and application
A technology for soluble organic matter and heavy metal adsorption, which is applied in the fields of adsorption water/sewage treatment, chemical instruments and methods, water pollutants, etc.
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Embodiment 1
[0029] The method for preparing humic acid impregnated biochar:
[0030] (1) Put the dried and ground palm shell biomass raw material into an electric furnace, and calcine it with nitrogen gas at 400°C for 3 hours, wash the obtained biochar product with distilled water for 3 times, dry it at 80°C, grind Finely pass through a 100-mesh sieve to obtain biochar for subsequent use, and its electron microscope picture is as follows figure 1 as shown in (a);
[0031] (2) Humic acid is mixed with the humic acid aqueous solution of 1.0g / L, simultaneously with the hydrochloric acid of 0.1mol / L and the sodium hydroxide of 0.1mol / L to adjust pH to be 5.0;
[0032] (3) Add biochar to the humic acid aqueous solution to make a mixed solution with a mass concentration of biochar of 10g / L, and stir or shake the mixed solution for 7 days;
[0033] (4) After stirring or shaking, the liquid phase is removed by centrifugation or filtration, and the residual solid is freeze-dried in a freeze drye...
Embodiment 2
[0037] The method for preparing humic acid impregnated biochar:
[0038] (1) Put the dried and ground palm shell biomass raw material into an electric furnace, and calcine it with nitrogen gas at 400°C for 3 hours, wash the obtained biochar product with distilled water for 3 times, dry it at 80°C, grind Finely pass through a 100-mesh sieve to obtain biochar for subsequent use;
[0039] (2) Humic acid is mixed with the humic acid aqueous solution of 2.0g / L, simultaneously with the hydrochloric acid of 0.1mol / L and the sodium hydroxide of 0.1mol / L to adjust pH to be 5.0;
[0040] (3) Add biochar to the humic acid aqueous solution to make a mixed solution with a mass concentration of biochar of 10g / L, and stir or shake the mixed solution for 7 days;
[0041] (4) After stirring or shaking, the liquid phase is removed by centrifugation or filtration, and the residual solid is freeze-dried in a freeze dryer to obtain humic acid-impregnated biochar.
[0042] Adsorption of Cd by bio...
Embodiment 3
[0045] Method for preparing tannic acid impregnated biochar:
[0046] (1) Put the dried and ground palm shell biomass raw material into an electric furnace, and calcine it with nitrogen gas at 400°C for 3 hours, wash the obtained biochar product with distilled water for 3 times, dry it at 80°C, grind Finely pass through a 100-mesh sieve to obtain biochar for subsequent use;
[0047] (2) Tannic acid is mixed with the tannic acid aqueous solution of 5.0g / L, regulates pH to be 5.0 with the hydrochloric acid of 0.1mol / L and the sodium hydroxide of 0.1mol / L simultaneously;
[0048] (3) Add biochar to the tannic acid aqueous solution to make a mixed solution with a mass concentration of biochar of 10 g / L, and stir or vibrate the mixed solution for 7 days;
[0049] (4) After stirring or shaking, the liquid phase was removed by centrifugation or filtration, and the residual solid was freeze-dried in a freeze dryer to obtain tannic acid-impregnated biochar. Its electron microscope pi...
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