A composite hydrogel-modified biochar material and its preparation method and application
A composite hydrogel and biochar technology, applied in the direction of water pollutants, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of complex operation, secondary pollution, high treatment cost, etc., achieve simple operation and improve adsorption capacity , time-consuming effect
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[0030] A preferred embodiment of the present invention discloses a preparation method of a CMC-sys-SCBC composite hydrogel-modified biochar material. The CMC-sys-SCBC composite hydrogel-modified biochar material is made of carboxymethyl fiber CMC, sodium citrate modified biochar (SCBC) as the main materials, L-cystine dimethyl ester dihydrochloride (cys) as the linking agent, prepared by amide reaction according to a certain proportion. Specific steps are as follows.
[0031] (a) Rice straw was selected as the raw material for the preparation of SCBC, and it was impregnated with sodium citrate. Subsequently, the mixed system was placed in a muffle furnace for firing and modification, and finally the SCBC material was pulverized, ground, and passed through a 100-mesh sieve for use.
[0032] (b) Put the CMC material into the aqueous solution at room temperature, and stir with a magnetic stirrer for a period of time so that it can be uniformly dissolved into a transparent viscou...
Embodiment 1
[0047] Example 1: Preparation of CMC-sys-SCBC composite hydrogel-modified biochar material
[0048] (1) Using rice straw as raw material, it was impregnated with 0.1 mol / L sodium citrate for 24 hours, and the impregnation ratio was 1:8 (m:v). Subsequently, the mixed system was dried in an oven to constant weight. The mixed system was placed in a muffle furnace and fired at 600°C for 3 hours for modification. After the temperature dropped to room temperature, the SCBC material was taken out, crushed, ground, passed through a 100-mesh sieve, and used for later use.
[0049] (2) Put 1.25 g of CMC material into 35 mL of solution at room temperature, and stir for a period of time at 700 rpm with a magnetic stirrer so that it can be uniformly dissolved into a transparent viscous substance. At the same time, 0.01 g of L-cystine dimethyl ester dihydrochloride (cys) was separately prepared into a 5 mL aqueous solution and used for subsequent use.
[0050] (3) Put 0.5 g of SCBC materi...
Embodiment 2
[0054] Example 2: Application of CMC-sys-SCBC composite hydrogel-modified biochar material in the removal of various heavy metal cations
[0055] (1) The composite hydrogel-modified biochar material prepared in Example 1 was used to treat heavy metal wastewater. The composite materials with a dry weight of 0.4g were weighed in turn, placed in 50mL containers, and 40mL of heavy metal ion solution (copper, zinc, cadmium, nickel, lead) with an initial concentration of 500mg / L was added to it, and the solution was heated in a constant temperature oscillator at 298K. Shake at 180rpm for 24h.
[0056] (2) After the adsorption reached equilibrium, the composite material and the target solution were separated by a 0.45 μm filter membrane, and the concentration of heavy metal ions in the solution at the initial and equilibrium time was measured by inductively coupled plasma emission spectrometer, and the removal efficiency of the material was calculated. The experimental results are a...
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