a magnetic fe 3 o 4 /Biochar adsorbents and applications
A biochar and adsorbent technology, which is applied in the fields of adsorption water/sewage treatment, water/sludge/sewage treatment, alkali metal oxides/hydroxides, etc. It is not obvious and affects the morphology of biochar, and achieves the effect of enriching the structure of functional groups, reducing the by-product ferric oxide, and improving the removal performance.
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[0039] The preferred preparation process of biochar is as follows: the biomass material is placed in an oxygen-isolated environment, rapidly heated to 500-600°C at a rate of 20-30°C / min, thermally carbonized for 60-90 minutes, ground after natural cooling, and dried for storage; Further, the biomass material is placed in a CO 2 In a sealed pressure device, increasing the pressure makes the CO 2 Transform into supercritical fluid and immerse the biomass material, then release the pressure, repeat the operation for 3 to 5 times, and then soak the biomass material in water for 12 to 24 hours; further, the pressure increase rate is less than the pressure release rate, and further, the pressure increase The rate is 0.1-0.5MPa / min, and the pressure relief rate is 2-3MPa / min; preferably the biomass material is one of rice husk, broken straw and wood chips.
[0040] The above magnetic Fe 3 O 4 / Application of biochar adsorbent in the removal of Cr from water. Preferably, the pH va...
Embodiment 1
[0043] A magnetic Fe 3 O 4 / Biochar adsorbent, prepared by the following methods:
[0044] (1) 0.10g (0.5mmol) FeCl 2 ·4H 2 O, 0.27g (1mmol) FeCl 3 ·6H 2 O ultrasonically dissolved in a round-bottomed flask containing 20 mL of ethylene glycol;
[0045] (2) 0.3g of biochar was uniformly dispersed in ethylene glycol under the aid of ultrasonic waves, and then 2mL (0.16g, 4mmol) of 2mol / L NaOH solution was added;
[0046] (3) Place the round-bottomed flask in a microwave oven, open a hole at the top of the microwave oven, introduce a condensation reflux tube above the round-bottomed flask, maintain continuous condensation and reflux operation, and the temperature of the condensate liquid is 10 ° C; the frequency of the microwave is 2.45 × 10 9 Hz, the power of the microwave is 640W; the microwave reaction is 20min;
[0047] (4) After the reaction was completed, it was cooled to room temperature, and the obtained black product was collected by centrifugation, washed with a...
Embodiment 2
[0051] A magnetic Fe 3 O 4 / Biochar adsorbent, prepared by the following methods:
[0052] (1) 0.10g (0.5mmol) FeCl 2 ·4H 2 O, 0.27g (0.8mmol) FeCl 3 ·6H 2 o Dissolved by sonication in a round-bottomed flask containing 20 mL of ethylene glycol;
[0053] (2) 0.25g of biochar was evenly dispersed in the solution under the aid of ultrasonic waves, and then 2mL (0.14g, 3.5mmol) of 1.75mmol / L NaOH solution was added;
[0054] (3) the round-bottomed flask is placed in a microwave oven, a hole is opened at the top of the microwave oven, a condensation reflux tube is introduced above the round-bottomed flask, and there is a continuous condensation reflux operation during the reaction, and the temperature of the condensate is 10 ℃, and the microwave The frequency is 2.0×10 9 Hz, the power of the microwave is 500W; the microwave reaction is 20min;
[0055] (4) After the reaction was completed, it was cooled to room temperature, and the obtained black product was collected by ce...
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