A resource recovery method for heavy metals in heavy metal wastewater
A recovery method and heavy metal technology, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., to achieve low cost, good economic and social benefits, and easy operation
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Embodiment 1
[0049] Measure 250mL of copper-containing electroplating wastewater (in copper-containing electroplating wastewater, Cu 2+ content: 100mg / L), add 8.7g of sodium citrate and 6.1g of glucose to it, stir well, then add dropwise 1mol / L of sodium hydroxide solution until the pH of the solution is 12. The solution was heated to 80 degrees to react. After reacting for 12 hours, the reaction solution was cooled to room temperature, and centrifuged to obtain the product (after testing, in the waste liquid after centrifuging the product, Cu 2+ content below 1mg / L). figure 1 It is the powder X-ray diffraction pattern of the prepared sample, which is compared with the standard spectrum, indicating that the prepared sample is cuprous oxide in cubic crystal phase. figure 2 It is the scanning electron micrograph of the prepared cuprous oxide nanoparticles. image 3 It is a photo of the prepared cuprous oxide product.
Embodiment 2
[0051] Measure 250mL of copper-containing electroplating wastewater (in copper-containing electroplating wastewater, Cu 2+ content: 73mg / L), add 8.7g sodium citrate and 15.4g sodium hypophosphite to it, stir well, then add 1mol / L sodium hydroxide solution dropwise until the pH value of the solution is 12. The solution was heated to 80 degrees to react. After reacting for 12 hours, the reaction solution was cooled to room temperature, and centrifuged to obtain the product (after testing, in the waste liquid after centrifuging the product, Cu 2+ content below 1mg / L). Figure 4 The powder X-ray diffraction pattern of the prepared sample is compared with the standard pattern, indicating that the prepared sample is simple copper in the cubic crystal phase. Figure 5 Scanning electron micrographs of the as-prepared copper nanoparticles. Image 6 It is a photo of the prepared elemental copper product.
Embodiment 3
[0053] Measure 250mL of copper-containing electroplating wastewater (in copper-containing electroplating wastewater, Cu 2+ content: 50mg / L), add 8.7g sodium citrate and 1.6g hydroxylamine hydrochloride to it, stir well, then add 1mol / L sodium hydroxide solution dropwise until the pH value of the solution is 12. The solution was heated to 80 degrees to react. After reacting for 12 hours, the reaction solution was cooled to room temperature, and centrifuged to obtain the product (after testing, in the waste liquid after centrifuging the product, Cu 2+ content below 1mg / L). Figure 7 It is the powder X-ray diffraction pattern of the prepared sample, which is compared with the standard spectrum, indicating that the prepared sample is cuprous oxide in cubic crystal phase. Figure 8 It is the transmission electron micrograph of the prepared cuprous oxide nanoparticles.
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