A method for adsorbing precious metal gold ions
A technology of adsorbent and metal organic framework, which is applied in the field of separation and recovery of precious metals, can solve the problems of weak adsorption capacity of biosorbents, poor reusability, complicated adsorption process, etc., and achieve the goal of simple method, low cost of raw materials, and reduction of waste pollution Effect
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Embodiment 1
[0025] Use gold trichloride with a purity of 98% to prepare an Au(III) solution with a concentration of 300 mg / L, take 100 mL of the solution and add it to a 250 mL Erlenmeyer flask, adjust the pH to 2.5 with 0.1 mol / L HCl, add 50 mg of ZIF-8 material was used as an adsorbent, placed in a constant temperature water bath oscillator for oscillating adsorption, set the temperature at 25 °C, fixed-point sampling and detection, and measured the concentration of the original solution and the remaining solution after adsorption with an atomic absorption spectrometer. After 42 h, The adsorption capacity is 434 mg / L, and the adsorption rate is 68%.
Embodiment 2
[0027] Use gold trichloride with a purity of 98% to prepare an Au(III) solution with a concentration of 300 mg / L, take 20 mL of the solution and add it to a 50 mL centrifuge tube, adjust the pH to 5 with 0.1 mol / L HCl, add 10 The mg ZIF-8 material was used as an adsorbent, placed in a constant temperature water bath oscillator for oscillating adsorption, and the temperature was set at 25 °C. After 42 h, a certain amount of sample was taken, and the concentration of the original solution and the remaining solution after adsorption was measured by an atomic absorption spectrometer. The adsorption capacity is 208 mg / L, and the adsorption rate is 42%.
Embodiment 3
[0029] Prepare a 400 mg / L Au(III) solution with gold trichloride with a purity of 98%, take 20 mL of the solution and add it to a 50 mL centrifuge tube, adjust the pH to 2.5 with 0.1 mol / L HCl, add 10 The mg ZIF-8 material was used as an adsorbent, placed in a constant temperature water bath oscillator for oscillating adsorption, and the temperature was set at 45 °C. After 42 h, a certain amount of sample was taken, and the concentration of the original solution and the remaining solution after adsorption was measured with an atomic absorption spectrometer. The adsorption capacity is 580 mg / L, and the adsorption rate is 68%.
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