Method for recovering gold using thiourea graphene
A technology using thiourea and graphene, which is applied in the field of gold recovery, can solve the problems of ion-exchange resins being unable to produce effects and gold ion adsorption efficiency becoming poor, achieving optimal adsorption efficiency, low adsorption limit, and high saturated adsorption capacity Effect
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Embodiment 1
[0040] Embodiment 1: the influence of reaction time on adsorption efficiency
[0041] In this embodiment, the reaction conditions are: thiourea graphene is 0.5 mg, the concentration of gold ions is 10 mg / L, the reaction temperature is 30° C., the oscillation speed is 150 rpm, the pH value is 2, and the reaction volume is 50 ml. And the reaction time is 12, 24, 48, 72, 96, 120 hours respectively.
[0042] Depend on Figure 3A The results show that when the reaction time is 96 hours, the adsorption efficiency of thiourea graphene to gold ions is about 82.7±6.1%. When the reaction time was 120 hours, the adsorption efficiency of thiourea graphene to gold ions did not increase significantly. That is to say, when the reaction time is 96 hours, the adsorption kinetics of thiourea graphene to gold ions can reach a balance, and can show good adsorption efficiency.
[0043] It should be noted that, in this embodiment, the adsorption efficiency is calculated according to formula 1. ...
Embodiment 2
[0044] Embodiment 2: the influence of the pH value of reaction on adsorption efficiency
[0045] In this embodiment, the reaction conditions are: thiourea graphene is 0.5 mg, the concentration of gold ions is 10 mg / L, the reaction temperature is 30 ° C, the oscillation speed is 150 rpm, the reaction time is 96 hours, and the reaction volume is 50 ml , and the pH values of the reactions were 2, 3, 4, 5, 6, 7, 8, 9, 10, respectively.
[0046] Depend on Figure 3B The results show that when the reaction pH value is 2-5, the adsorption efficiency of thiourea graphene to gold ions is about 80-85%. When the pH value of the reaction is 6, the adsorption efficiency of thiourea graphene to gold ions is about 40-50%. However, when the pH value of the reaction exceeds 6, the adsorption efficiency of thiourea graphene on gold ions rapidly decreases to less than 20%. That is to say, when the pH value of the reaction is 2-5, the thiourea graphene can exhibit good adsorption efficiency ...
Embodiment 3
[0047] Embodiment 3: the dosage of thiourea graphene influences on adsorption efficiency
[0048]In this embodiment, the reaction conditions are: the concentration of gold ions is 10 mg / L, the reaction temperature is 30°C, the shaking speed is 150 rpm, the reaction time is 96 hours, the reaction volume is 50 ml, the pH value is 5, and the sulfur The doses of urea graphene were 0.5, 1.0, 1.5, 2.0 mg, respectively.
[0049] Depend on Figure 3C The results show that when the dose of thiourea graphene is 0.5 mg, the adsorption efficiency of thiourea graphene to gold ions is about 82.7±6.1%. However, when the dose of thiourea graphene was 1.0, 1.5, or 2.0 mg, the adsorption efficiency of thiourea graphene for gold ions was only slightly increased. That is to say, when the dose of thiourea graphene is 0.5-2.0 mg, it can exhibit good adsorption efficiency for gold ions.
[0050] Then, step S130 is performed to separate the thiourea graphene adsorbing gold ions from the waste wate...
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