| The serious environmental pollution caused by livestock wastewater has become one of the most important environmental problems, which is a restriction on the development of green agriculture.Within many methods of treatment,adsorption is widely used.Because zeolite has a large surface area,rich mesoporous structure etc,so it has good application prospects.This project plans to optimize the preparation of Mn-oxide-coated zeolite to gain a high efficient adsorbent.The adsorption characteristics of single and co-pollution of TC, Cu(II) and Cd(II), interaction regularity and the effect of pH are studied systematically.The results of this study were as follows:(1)From the SEM-EDS、FT-IR、Isoeletric point figure of adsorbent,we know:compare zeolite,Mn-oxide-coated zeolite has higher content manganese,its surface is more rough、deposits and large pores.(2)From the tetracycline/copper/cadmium single process onto adsorbent,we know: Power model best fit tetracycline,zeolite fast adsorption time is 15 min,Mn-oxide-coated zeolite fast adsorption time is 8h. The Freundlich model was the best.When pH is 2~10, quantity is increased and decreased. Pseudo-second and Power model best fit copper,fast adsorption time is 6h,pseudo-second and pseudo-first best fit cadmium, fast adsorption time is 24 h. When pH is 2 ~6, quantity both increased and steady.(3)From the co-pollution process onto adsorbent,we know: copper and cadmium can add tetracycline quantity,tetracycline although increased speed,but decrease copper quantity. Power model best fit tetracycline and copper,pseudo-second best fit cadmium.Freundlich model was the best.When pH is 2~6,in TC&Cu conditions, TC quantity is increasing and Cu quantity increased and decreased;in TC&Cd conditions,TC quantity is enlargement 、decreased and extend,Cd quantity is increasing.Besides,tetracycline was added to change the adsorption of copper,but cadmium essentially unchanged. |
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