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Author (up) Pina, S.; Sandoval, A.M.; Jara-Ulloa, P.; Contreras, D.; Hassan, N.; Coreno, O.; Salazar, R. doi  openurl
  Title Nanostructured electrochemical sensor applied to the electrocoagulation of arsenite in WWTP effluent Type
  Year 2022 Publication Chemosphere Abbreviated Journal Chemosphere  
  Volume 306 Issue Pages 135530  
  Keywords Arsenic elimination; Electrocoagulation; Electrochemical sensor; Wastewater treatment; Environmental pollutants  
  Abstract A sensitive electroanalytical method for the determination of arsenite, based on a heterostructure of aminated multiwalled carbon nanotubes and gold nanoparticles, was applied in an electrocoagulation (EC) treatment for the elimination of arsenite. A sensitive quantitative response was obtained in the determination of As3+ in a secondary effluent from a wastewater treatment plant from Santiago (Chile). The preconcentration stage was optimized through a Central Composite Face design, and the most sensitive peak current was obtained at 200 s and -600 mV of time and accumulation potential, respectively, after a differential pulse voltammetry sweep. Electroanalytical determination was possible in an interval between 42.89 and 170.00 mu g L-1 with a detection limit of 0.39 mu g L-1, obtaining recoveries over 99.1%. The developed method was successfully applied in an electrocoagulation treatment to remove 250 mu g L-1 of arsenite from a polluted effluent in a batch system. Complete arsenite removal was achieved using a steel EC system with a current density of 6.0 mA cm(-2) in less than 3 min of treatment.  
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  ISSN 0045-6535 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000828037200004 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1624  
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