Eggshell straw biochar composite microsphere phosphorus removal adsorbent with high adsorption performance, and preparation method and application thereof
A technology of straw biology and phosphorus adsorbent, which is applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve the problems of high inorganic content and difficult embedding into balls, and achieve good mass transfer, Achieve industrial application and increase mechanical strength
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[0022] 1. Preparation process of eggshell straw biochar composite microspheres:
[0023] (1) The eggshell and corn stalks are washed separately, dried, pulverized and mixed to obtain eggshell stalk biomass powder. Then add it into water, fully oscillate and mix to obtain a biochar precursor; wherein the mass ratio of eggshell and corn stalk is (0.2-0.6):1, and the mass-volume ratio of eggshell stalk biomass powder to water is 1:(10- 30) g / mL;
[0024] (2) Add the biochar precursor to the sodium alginate aqueous solution and stir evenly; drop the mixed slurry into the calcium chloride cross-linking solution with a dropper to obtain cross-linked pellets. After hardening for 10-20 hours, wash and dry dry; the mass concentration of the sodium alginate is 3%-6% w / v, and the concentration of the calcium chloride solution is 4%-6% w / v;
[0025] (3) The dried pellets are placed in a tube furnace, and pyrolyzed at 600-900° C. for 1-3 hours under the protection of nitrogen or inert ga...
Embodiment 1
[0032] Add 10 g of egg shell and corn stalk biomass powder (mass ratio of egg shell to corn stalk: 0.2:1) into 200 mL of purified water, shake and mix well. Then add sodium alginate aqueous solution (mass concentration is 5% w / v), after stirring evenly, drop the mixed slurry into calcium chloride (mass concentration is 5% w / v) crosslinking solution with a dropper to obtain crosslinking After the pellets harden for 15 hours, wash and dry them. The dried pellets were placed in a tube furnace and pyrolyzed at 700 °C for 2 h under the protection of nitrogen to obtain eggshell straw biochar composite microspheres.
Embodiment 2
[0034] Add 10 g of egg shell and corn stalk biomass powder (mass ratio of egg shell to corn stalk is 0.4:1) into 200 mL of purified water, shake and mix well. Then add sodium alginate aqueous solution (mass concentration is 5% w / v), after stirring evenly, drop the mixed slurry into calcium chloride (mass concentration is 5% w / v) crosslinking solution with a dropper to obtain crosslinking After the pellets harden for 15 hours, wash and dry them. The dried pellets were placed in a tube furnace and pyrolyzed at 700 °C for 2 h under the protection of nitrogen to obtain eggshell straw biochar composite microspheres.
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