Abstract
This paper describes an experimental study for the removal of copper ions from electroplating wastewater. Different metal ions are added to the wastewater to remove copper ions by coprecipitation and the copper-based supramolecular materials with layered structures are obtained. It is found that the best results are obtained with the addition of –Mg2+–Al3+mixture with ratio of 3 : 1, pH ≈ 10, and aging for 1 d at 60°C. With these conditions, the residual copper in the electroplating wastewater satisfies national emission standards and wastewater handling capacity of up to 30 mL can be achieved. The properties of the copper-based supramolecular materials prepared under these optimal conditions are characterized. The results show that the materials have a layered structure and good thermal and structural stability and achieve a saturated adsorption of iodide ions of 41.23 mg/g.
Highlights
Electroless plating of metal coatings onto nonmetallic surfaces by means of chemical deposition can provide protection and improve the performance of the plated surface in various technical applications [1,2,3]
According to the Jahn-Teller effect, layered double hydroxides (LDHs) from copper alone are not stable owing to the high copper content in electroplating wastewater, and there is less precipitation
The results show that the addition of Ca2+, Fe2+, Zn2+, or Mg2+–Al3+ reduced the concentration of copper ions in the electroplating wastewater
Summary
Electroless plating of metal coatings onto nonmetallic surfaces by means of chemical deposition can provide protection and improve the performance of the plated surface in various technical applications [1,2,3]. The chemical plating technique is applicable to the treatment of surfaces that are not electrically conducting [4,5,6] Both the electroplating process itself and the cleaning of the coating produce a considerable amount of waste. Electroplating wastewater contains a wide range of copper compounds, in addition to Fe3+, Zn2+, Cd2+, Ni2+, Cr3+, and many other heavy metal ions. Do these represent a waste of resources, but as environmental pollutants they are hazardous to human and animal health [7,8,9]. The preparation and properties of these materials are investigated with regard to the use of this method in environmental protection
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