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 -Mg 2+ -Al 3+ 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.

Cu/Zn/Al-hydrotalcite-like compound (Cu/Zn/Al-HTlc) was prepared by the coprecipitation method with ZnII, AlIII cations solution, and electroplating wastewater containing CuII cation. The preparation conditions of Cu/Zn/Al-HTlc were optimized. The metal ion pollutants removal effect and iodide maximum adsorption capacity of Cu/Zn/Al-HTlc were also studied. The physicochemical properties of the Cu/Zn/Al-HTlc were analyzed by X-ray diffraction, FTIR, SEM, N2 adsorption-desorption isotherms, and TG-DTG. The results showed that Cu/Zn/Al-HTlc should be prepared with the ZnII-AlIII molar ratio of 1.5 : 1, pH = 11, and aged at room temperature for 0.5 d. Structural analysis showed that the Cu/Zn/Al-HTlc was a layered compound. CuII and other metal ion pollutants can also be successfully removed from electroplating wastewater in the preparation process of Cu/Zn/Al-HTlc and reached Chinese National Emission Standard (GB 21900-2008). The optimal adsorption condition of calcinated Cu/Zn/Al-HTlc for iodide was as follows: the solid-liquid ratio was 1 : 250, the pH value was 8, and the adsorption process was carried out at 25°C for 30 min. The saturated adsorption capacity reached 1000 mg·g−1 at the optimal adsorption condition. The main reason for this high-saturated adsorption capacity of Cu/Zn/Al-HTlc was that iodide penetrated into the layered structure of Cu/Zn/Al-HTlc by physical adsorption and CuII undergoes a specific redox reaction, producing CuI. Hence, coprecipitation synthetic technology and prepared Cu/Zn/Al-HTlc could be potentially used for electroplating wastewater treatment.

aThe HS-β-cyclodextrin/gold nanoparticles/hollow carbon microspheres (HS-β-CD/AuNPs/HCMS) hybrids were successfully synthesized and characterized via scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), fourier transform infrared spectroscopy (FT-IR), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). A simple and reliable chiral sensing platform constructed by the prepared hybrids was used for enantioselective recognition of ascorbic acid (AA) and isoascorbic acid (IAA), moreover, the stereo selectivity of HS-β-CD/AuNPs/HCMS to AA or IAA was investigated via differential pulse voltammetry (DPV). The results showed that obvious difference of peak currents of AA and IAA was obtained, demonstrating this strategy could be employed to enantioselectively recognize AA and IAA. Under the optimum conditions, the chiral sensor exhibited an acceptable linear response to AA or IAA in a linear range of 1.0 × 10 −4 to 5.0 × 10 −3 M with a limit of detection of 1.7 × 10 −5 M (S/N = 3). This approach provided a new available sensing interface to recognize and determine AA or IAA by electrochemical technology.The HS-β-cyclodextrin/gold nanoparticles/hollow carbon microspheres hybrids were prepared to develop a simple strategy for electrochemical chiral analysis.

This experiment studies on the used infrared spectroscopy to establish technology methods for liquor identification methods, as well as offers the science data for establishment of the fingerprint in white spirit. The results have shown that using near-infrared spectroscopy analysis of liquor has the obvious features such as strong specificity, good reproducibility, simple operation, and finally confirmed that it is an authentic and ideal method for identification in white spirit.