Preparation method of loess-based polyacrylamide adsorbent
A polyacrylamide and acrylamide technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of difficult sedimentation and separation, cumbersome preparation process, etc., and achieve strong chelating ability and adsorption ability, good adsorption performance Effect
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Embodiment 1
[0025] 1. Preparation of loess-based polyacrylamide adsorbent
[0026] In a 250 mL three-necked flask, add 12 g of loess (LS) and 30 mL of distilled water, stir mechanically to disperse evenly, then add 4 g of acrylamide (AM), 0.03 g of N,N-methylenebis Acrylamide (MBA), stirred at room temperature for 30 minutes, then heated up to 45°C to dissolve acrylamide; added 0.06 g ammonium persulfate (APS), continued to heat up to 75°C and stirred for 1 hour to obtain a gel-like solid polymer; The mixture was washed with distilled water for 3 to 5 times to remove unreacted monomers, and then washed with ethanol for 2 to 4 times to remove the water and cut into small pieces; vacuum dried and ground into powder to obtain 14.8 g loess-based polyacrylamide Adsorbent.
[0027] 2. Determination of adsorption performance
[0028] (1) Adsorption of MB-containing simulated wastewater: the concentration of MB in wastewater is 20 mg / L, pH=6-7; the amount of adsorbent is 0.5g / L, and the decolor...
Embodiment 2
[0031] 1. Preparation of loess-based polyacrylamide adsorbent
[0032] In a 250 mL three-necked flask, add 8 g of loess (LS) and 30 mL of distilled water, stir mechanically for 30 min to disperse evenly, then add 4 g of acrylamide (AM), 0.04 g of N,N-methylene Add bisacrylamide (MBA), stir at room temperature for 30 min, then raise the temperature to 45°C to dissolve the acrylamide; add 0.24 g ammonium persulfate (APS), continue to heat up to 65°C and continue stirring for 2.5 h to obtain a gel-like solid polymer thing. The polymer was washed with distilled water for 3 to 5 times to remove unreacted monomers, and then washed with ethanol for 2 to 4 times to remove the water in the gel, cut into small pieces, dried in vacuum, and ground into powder to obtain 10.7 g loess base polyacrylamide adsorbent.
[0033] 2. Determination of adsorption performance
[0034] Experimental conditions are the same as in Example 1. The decolorization rate of MB reached 94.1%, and the adsorpt...
Embodiment 3
[0036] 1. Preparation of loess-based polyacrylamide adsorbent
[0037]In a 250 mL three-necked flask, add 16 g of loess (LS) and 30 mL of distilled water, stir mechanically for 30 min to disperse evenly, then add 4 g of acrylamide (AM), 0.064 g of N,N-methylene Add 0.16 g of ammonium persulfate (APS), continue to heat up to 85°C, and stir for 3 h to obtain a gel-like solid polymer The polymer was washed with distilled water for 3 to 5 times to remove unreacted monomers, and then washed with ethanol for 2 to 4 times to remove the water, cut into small pieces, dried in vacuum, and ground into powder to obtain 18.1 g loess base polyacrylamide adsorbent.
[0038] 2. Determination of adsorption performance
[0039] Experimental conditions are the same as in Example 1. The decolorization rate of MB reached 97.4%, and the adsorption capacity was 127.6 mg / g. The removal rate of Pb(II) reached 93.2%, and the adsorption capacity was 119.7 mg / g.
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