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.

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.

The adsorption capacity of arsenic (Ⅲ) on manganese oxide, iron oxide, aluminum oxide increased gradually with the increase of arsenic (Ⅲ) concentration, the experimental saturated adsorption capacity on manganese oxide, iron oxide, aluminum oxide under 25 ℃ were found to be 48.38, 23.70, 3.52 mg/g, respectively. Adsorption isotherm of three oxides could better meet the Langmuir model and the Freudlich model, the best one was the Langmuir model. The desorption balance time of simulant acid rain on manganese oxide, iron oxide, aluminum oxide were 90, 60, 15 min, respectively. The pH value of simulant acid rain increased, the desorption capacity of As (Ⅲ) on iron oxide, aluminum oxide decreased gradually and then became balance, while the maximum desorption capacity on manganese oxide reached at the pH value of 4. Ionic strength had neglectable effect on desorption. To manganese oxide, iron oxide, the effect were not obvious when desorption times increased. It was an important reason for arsenic ( Ⅲ ) retention in soils that manganese oxide, iron oxide had large adsorption capacity for arsenic (Ⅲ), which could not be easily eluted by simulant acid rain.