Preparation Of PAM-GSH And Removal Of Manganese, Copper And Cadmium

With the national "thirteen five" during the environmental indicators and pollution control system released,water and soil pollution prevention and control work of our country in recent years is also constantly strengthened.When the mining,manufacturing and other industries are slashing overcapacity production capacity in our country,and in the background that the control of environmental pollutants is getting strict increasingly,the heavy metal pollution control and prevention of heavy metal wastewater discharge standards have gradually increased.As the main method of traditional water treatment industry,the coagulation method does not need to be put into the promotion cost again due to it has a series of advantages such as simple principle,convenient operation and low cost.In this study,the common organic polymer coagulant polyacrylamide?PAM?was optimized,and the heavy metal complexes on the reduced glutathione?GSH?were grafted onto the PAM molecular chain by amidation reaction to produce a new thiolated polymer coagulant?PAM-GSH?.On the basis that the PAM itself has a better ability to absorb the bridge,it strengthens its coordination of heavy metal coordination capacity in making it a mercapto-containing organic polymer coagulant and be more effective removal of heavy metals in water.A higher molecular weight PAM was prepared by aqueous solution polymerization with AM as raw material followed by preparation of PAM and GSH as raw materials through the amidation reaction preparation PAM-GSH.The influence of the conditions such as mass ratio,reaction time,pH value and formaldehyde on the properties of the product PAM-GSH was studied.Finally,the optimized synthesis conditions were obtained: When the mass ratio of PAM / GSH is 16: 3,the reaction time is 2h + 2h,the dosage of formaldehyde is 2ml and the pH value is 5.Under these conditions,the PAM-GSH product was subjected to heavy metal simulated wastewater treatment experiment,and the experimental results were obtained with the removal rate of Mn???could reach99.1%.The characterization of PAM-GSH products synthesized under optimized conditions was characterized by Fourier transform infrared spectroscopy,scanning electron microscopy,energy spectrum analysis,differential thermal-thermogravimetric analysis and X-ray diffraction analysis.And it had proved that the product was confirmed by PAM and GSH,and the strong coordination group mercapto group was successfully introduced into the PAM molecular chain.The product could be stable at room temperature and the thermal stability was strong.What's more,the surface roughness existed in the hole structure in showing a certain mesh space structure with a certainadsorption effect.The effects of PAM-GSH on the removal efficiency of manganese,copper and cadmium under different hydraulic conditions and water quality were investigated by single factor method or orthogonal experiment design with simulated wastewater containing manganese,copper and cadmium,and it mainly included several influence conditions such as PAM-GSH dosage,reaction time,standing time,pH value,turbidity,K + / Al³⁺ ion concentration.And the results showed that PAM-GSH had the best removal conditions for manganese,copper and cadmium,and the removal effect of K⁺and Al³⁺ on manganese,copper and cadmium was inhibited,and the higher the concentration of K⁺ and Al³⁺,the stronger the effect is.