高锰酸钾协同粉末活性炭同步除锰除铊的效能与机制OA

Addressing the water treatment challenge posed by the significant differences in properties between manganese(Mn)and thallium(Tl),which complicates their simultaneous removal,this study systematically evaluated the removal efficiency of Mn and Tl in water using a synergistic process combining potassium permanganate(KMnO4)oxidation with powdered activated carbon(powdered activated carbon,PAC)adsorption.The mechanism underlying their synergistic removal was also elucidated.The results indicated that the dosage of 10.0 mg·L-1 KMnO4 alone can reduce 8.0 mg·L-1 Mn to less than the limit value stipulated in the Surface Water Environmental Quality Standard(GB 3838-2002),however,a higher dosage was needed for the removal of Tl.When KMnO4 simultaneously removed Mn and Tl,the oxidation of Mn2+to form highly reactive MnOx in situ promoted the rapid removal of Tl.While theoretically capable of achieving simultaneous compliance,practical process control remains challenging.Neither Mn nor Tl removal by PAC alone met standard requirements.The combined KMnO4+PAC process significantly enhanced simultaneous Mn and Tl removal.The combination of 15.0 mg·L-1 KMnO4 and 30.0 mg·L-1 straw-derived PAC achieved removal rates exceeding 99.0%for both Mn and Tl after 10 minutes of treatment,meeting standards simultaneously.The results of scanning electron microscopy,X-ray diffraction,and particle size analysis revealed that the KMnO4+PAC combination rapidly generated δ-MnO2 and β-MnO2.Through oxidation and a coupled mechanism of surface complexation adsorption by PAC/MnOx,it achieved rapid simultaneous removal of Mn and Tl.The aim of this study was to establish a regulated system for the simultaneous and efficient removal of Mn and Tl from water,and to provide theoretical basis and technical support for the treatment of complex heavy metal composite pollution.