A kind of preparation and use method of magnetic porous biochar for removing chromium in water
A biochar and water removal technology, applied in chemical instruments and methods, biofuels, water pollutants, etc., can solve problems such as difficult recovery, inactivation, and easy agglomeration, and achieve the effects of reducing toxicity, promoting removal, and easy separation
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[0049] A preparation method of magnetic porous biochar for removing chromium in water, using Fe(III) as a magnetic precursor, through the method of slow pyrolysis and in-situ carbon reduction after impregnation and loading, Artemia eggshells are prepared into magnetic porous biochars carbon.
[0050] The biomass raw material of the biochar is Artemia eggshell, which belongs to the waste of the aquatic industry, and the cost is low, and the waste can be utilized at the same time; the magnetism is derived from nano Fe 3 O 4 Particles, Nano Fe 3 O 4 The average particle size is about 70nm, and its precursor is Fe(III). During the slow pyrolysis process of eggshell, part of Fe(III) is reduced to Fe(II) by the generated carbon in situ without additional Adding other reducing agents, the preparation method is simple;
[0051] The porous is a microscopic multi-level pore structure, the pore size is 200nm-2μm, and the nanometer Fe 3 O 4 The particles are uniformly distributed in...
Embodiment 1
[0066] Weigh 5g of Artemia eggshells washed with ethanol solution and immerse them in 200mL of 1mol / L FeCl 3 The solution was stirred at 25 °C for 24 h, then the solid was filtered off and dried at 60 °C.
[0067] The above-mentioned dried solids were placed in a tube furnace, and after nitrogen protection was introduced, the temperature was raised to 450 °C at a heating rate of 12.5 °C / min, and the heating was stopped after holding for 5 h to complete slow pyrolysis and in-situ carbon reduction. process.
[0068] After the material was cooled to room temperature, it was ground, rinsed with deionized water, and dried at 60 °C to obtain the magnetic porous biochar.
[0069] like figure 1 As shown, the magnetic porous biochar retains a complete hierarchical pore structure, and the nanoparticles are uniformly distributed in the pores. 3 O 4 form exists, figure 2 Its XRD characteristic diffraction peaks.
Embodiment 2
[0071] Take 0.025 g of the magnetic porous biochar prepared in Example 1 and add it to K with an initial concentration of Cr(VI) of 50 mg / L. 2 Cr 2 O 7 The solution volume was 50 mL, and the pH was adjusted to 2.0 with NaOH and HCl. The above system was shaken at 25°C at 160 rpm for 24 h. After the reaction, the biochar was magnetically separated, and the concentration of remaining chromium ions in the liquid phase was determined by diphenylcarbazide spectrophotometry. The calculated adsorption amount of Cr(VI) was 143.89 mg / g, and the removal rate was 94.26%.
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