Modified preparation method for corn straw capable of adsorbing arsenic in water
A technology for absorbing water from corn stalks, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of unused straw, environmental pollution, waste of resources, etc., and achieve low price, Raw materials are readily available and easy to handle
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[0023] Example 1
[0024] (1) Remove the middle section of the air-dried corn stalks, cut them into short stalks, wash and dry to a constant weight, then remove the surface crust and cut them into straw particles with a diameter of 0.8~1.2cm;
[0025] (2) Soak the above straw particles in isopropanol with a volume concentration of 0.8% for 9 hours, take it out, wash it with deionized water, and dry it;
[0026] (3) Soak the dried straw particles in step (2) in a NaOH solution with a concentration of 0.8 mol / L for 8 hours, and then wash them with deionized water for 3 to 5 times to make the pH value medium Dry it at 77℃;
[0027] (4) Soak the straw particles dried in step (3) in oxalic acid with a concentration of 0.22mol / L, soak for 6 hours, take it out, wash it with deionized water, and dry it to obtain modified corn stalks. Adsorbent.
[0028] Adopt the modified corn stalks to adsorb arsenic in the water, adjust the pH of the arsenic-containing water to be treated to 9.5, control th...
Example Embodiment
[0030] Example 2
[0031] (1) Remove the middle section of the air-dried corn stalks, cut them into short stalks, wash and dry them to a constant weight, then remove the surface crust, and cut them into straw particles with a diameter of 1.8~1.2cm;
[0032] (2) Soak the above straw particles in isopropanol with a volume concentration of 1.2% for 10 hours, take it out, wash it with deionized water, and dry it;
[0033] (3) Soak the dried straw particles in step (2) in a NaOH solution with a concentration of 1.0mol / L, soak for 7 hours, and then wash them with deionized water for 3~5 times to make the pH value medium Dry again at 73℃;
[0034] (4) Soak the straw particles dried in step (3) in oxalic acid with a concentration of 0.18mol / L, soak for 7 hours, take it out, wash it with deionized water, and dry it to obtain modified corn stalks. Adsorbent.
[0035] Adopt the modified corn stalks to adsorb arsenic in the water, adjust the pH of the arsenic-containing water to be treated to 9.0...
Example Embodiment
[0037] Example 3
[0038] (1) Remove the middle section of the air-dried corn stalks, cut them into short stalks, wash and dry them to a constant weight, then remove the surface crust, and cut them into straw particles with a diameter of 1.8~1.2cm;
[0039] (2) Soak the above straw particles in isopropanol with a volume concentration of 1.0% for 8 hours, take it out, wash it with deionized water, and dry it;
[0040] (3) Soak the dried straw particles in step (2) in a NaOH solution with a concentration of 1.2 mol / L for 6 hours. After taking it out, wash it with deionized water repeatedly for 3 to 5 times to make the pH value medium Dry again at 75℃;
[0041] (4) Soak the straw particles dried in step (3) in oxalic acid with a concentration of 0.2mol / L, soak for 8 hours, take it out, wash it with deionized water, and dry it to finally obtain modified corn straw Adsorbent.
[0042] Adopt the modified corn stalks to adsorb arsenic in the water, adjust the pH of the arsenic-containing wat...
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