Thiosemicarbazide-bonded PDA@MWCNTs adsorbent and preparation method and application thereof
A technology of thiosemicarbazide and adsorbent, which is applied in the direction of chemical instruments and methods, other chemical processes, and the improvement of process efficiency, can solve problems such as hindering application and affecting the dispersion performance of multi-walled carbon nanotubes, and achieves fast adsorption rate, The effect of strong selectivity and large adsorption capacity
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Embodiment 1
[0020] Synthesis of Thiosemicarbazide Bonded PDA@MWCNTs Adsorbent
[0021] (1) Synthesis of PDA@MWCNTs
[0022] Weigh 400 mg of dopamine hydrochloride and dissolve it in 200 mL of Tris-HCl buffer solution with a pH of 8.5, then weigh 200 mg of multi-walled carbon nanotubes and add them to the above solution, and stir magnetically at room temperature for 24 h under aerobic conditions. Repeated washing with water and ethanol for several times, suction filtration, drying in a vacuum oven at 50°C for 12 hours, the product is recorded as PDA@MWCNTs;
[0023] (2) Oxidation of PDA@MWCNTs
[0024] Weigh 250mg of PDA@MWCNTs and add it to 50mL of 1wt% hydrogen peroxide solution, stir magnetically at room temperature for 13h, wash the reacted product several times with ultrapure water, filter it with suction, and dry it in a vacuum oven at 50°C 12h, the product is recorded as O-PDA@MWCNTs;
[0025] (3) Synthesis of thiosemicarbazide-bonded PDA@MWCNTs adsorbent
[0026] Add 2g of thio...
Embodiment 2
[0028] Table 1 is the adsorption selectivity experiment of TSC-PDA@MWCNTs. The following binary mixed systems were selected for adsorption experiments: Au(III)-Cu(II), Au(III)-Pb(II), Au(III)-Cd(II), Au(III)-Cr(VI), Au(III)-Zn(II), Au(III)-Ni(II), Au(III)-Co(II), Au(III)-Mn(II), Au(III)-Mg(II). The concentration of Au(III) and other metal ions is 100mg / L, the volume is 50mL, 10mg adsorbent TSC-PDA@MWCNTs, the temperature is 30°C, the shaking speed is 160rpm, and the time is 2h. It can be seen from Table 1 that the common metals have almost no interference on the adsorption of gold on the adsorbent TSC-PDA@MWCNTs, and the adsorption amount on the adsorbent TSC-PDA@MWCNTs is also very low. This shows that the adsorbent TSC-PDA@MWCNTs has strong selectivity for gold adsorption and strong anti-interference ability.
[0029] Table 1 TSC-PDA@MWCNTs adsorption selectivity
[0030]
Embodiment 3
[0032] Table 2 shows the selective adsorption of gold by TSC-PDA@MWCNTs from the aqua regia leaching solution of metal-enriched waste circuit boards. Dissolve 5g of waste circuit board metal-enriched body with aqua regia. After the dissolution is complete, move it to an electric heating plate to evaporate to dryness. After cooling, add a small amount of distilled water, filter, and dilute the filtrate to 100mL. Take 50mL of the leaching solution, 10mg of adsorbent TSC-PDA@MWCNTs, the temperature is 30°C, the shaking speed is 160rpm, and the time is 2h. It can be seen from Table 2 that the adsorption rate of gold reaches 73.8%, while the adsorption rates of other coexisting metals are very low. This shows that the adsorbent TSC-PDA@MWCNTs can selectively adsorb gold from the metal-enriched aqua regia leaching solution of discarded circuit boards.
[0033] Table 2 Selective adsorption of gold by TSC-PDA@MWCNTs from aqua regia leaching solution of waste circuit board metal-enric...
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