Application Of Functional Organic Complexes In The Classification And Utilization Of Waste

Heavy metal wastewater is one of the most toxic industrial wastewater to the environment and human beings,which has carcinogenicity,deformity and mutagenicity.Therefore,the removal and recycling of metal ions and the degradation of organic matter in water system are urgent.Functional organic complexing agents,such as TMT and DTC,have a strong binding effect on metal ions in water system,and obtain functional organic metal products with high added value,which has important industrial application value.In this paper,TMT was used to extract iron from aluminum extraction solution of coal gangue（Inorganic salt-water system）;DTC was used to extract zinc from phenol containing organic wastewater,and electrocatalytic degradation of phenol containing organic wastewater was used（Inorganic salt-organic matter-water system）.The specific research content is as follows:（1）Ten typical gangues were collected from Xiangyuan County,Shanxi Province.The gangues were roasted at 750 ℃ for 2 h,crushed and pulverized.The materials under 120 mesh were left for sulfuric acid leaching experiment.The results showed that the solid-liquid ratio was 1:15,sulfuric acid 3 mol/L,leaching for 2 h,reaction temperature was 105 ℃,and the leaching rate of aluminum and iron was the highest.According to the actual determined leaching rate of aluminum and iron,aluminum sulfate solution containing iron is prepared with pure aluminum sulfate and iron sulfate.The effect of TMT dosage,reaction temperature,time and other factors on iron removal is investigated.The results show that the p H of the solution containing iron sulfate is about 2.2,the proportion of TMT in the solution containing iron sulfate is 4.76%,the reaction temperature is 30 ℃,and the time is 10 min,the iron removal rate was 99.88%,and the aluminum loss rate was 65.04%.Fourier transform infrared spectroscopy（FT-IR）,X-ray powder diffraction（XRD）and thermogravimetry（TG-DTA）were used to characterize and analyze the Fe-Al organic precipitates.The results showed that the precipitates had good crystal form.The process of iron removal is more in accordance with the quasi second-order kinetic model.This method is simple in operation and low in cost,which provides a certain basis for the industrial application of the separation of coal gangue iron and refined aluminum sulfate.（2）In order to realize the high efficient utilization of zinc ion in phenol wastewater,the actual phenol wastewater of pharmaceutical factory is used as raw material,and DTC is used as complexing agent to recover zinc ion and synthesize zinc DTC precipitate.The zinc DTC precipitates were characterized and analyzed by Fourier transform infrared spectroscopy（FT-IR）,nuclear magnetic（¹H-NMR）and thermogravimetric analysis（TG-DTA）.Their melting points were tested.The effects of the amount of DTC,reaction temperature and time on zinc recovery were investigated.The results showed that the ratio of Zn²⁺ to DTC in phenol wastewater was 1:2.26 at 30 ℃ and p H was not adjusted,and the recovery of zinc ion was 98.81% at 20 min of reaction,and the precipitate with good purity was obtained.Considering the comprehensive cost,the molar ratio of Zn²⁺ to DTC was adjusted to 1:2.17 and the yield of ziram is 91.52%⁹4.03%.The method is simple in operation and low in cost,and can be used for recovery of high concentration zinc ions in phenol wastewater.（3）A series of particle electrodes（MnO_x/GAC）were prepared using commercial granular activated carbon（GAC）as the carrier and manganese acetate as the source of manganese.Microscopic analysis of activated carbon materials before and after modification by X-ray powder diffraction（XRD）,transmission electron microscopy（TEM）and Raman spectroscopy（Raman）.The effects of reaction temperature and time on the performance of phenol simulated wastewater treated by particle electrode were discussed.The results show that the active species of MnO_x/GAC are mainly dispersed in the nanocrystalline state with Mn₃O₄,Mn₂O₃ and Mn O₂.1 g of MnO_x/GAC with 8wt% Mn content was added to 20 m L of 1500 mg/L phenol wastewater,and the reaction was performed at 50 ° C for 4 h.The phenol conversion was 99.88% and the COD degradation was 97.80%.The adsorption kinetics follows a quasi-secondary dynamics model.A fixed-size iridium-ruthenium-plated titanium electrode was used as an anode,a stainless steel electrode was used as a cathode,and a manganese-carbon particle was used as a particle electrode.A three-dimensional electrode was used for electrocatalytic degradation of phenol simulated wastewater.The effects of voltage,different electrolytes,sodium chloride dosage,reaction time and other factors on the degradation efficiency of phenol simulated wastewater were discussed.It was concluded that when the voltage was 15 V,2 g Na Cl was added to react for 2 h.The effect of wastewater is obviously better than two-dimensional electrodes.Under the optimal conditions,a three-dimensional electrode filled with 10 g particle electrode degraded 100 m L of 10 g/L phenol simulated wastewater,with a phenol conversion rate of 96.10% and a COD degradation rate of 83.97%.