TiO2@C Nanostructured Electrodes for the Anodic Removal of Cocaine

被引:2
|
作者
Sanz, German [1 ]
Garcia, Luane Ferreira [2 ]
Yepez, Alfonso [3 ]
de Carvalho, Thays Colletes [4 ]
Vaz, Boniek Gontijo [4 ]
Romao, Wanderson [5 ]
Ivars-Barcelo, Francisco [3 ]
Gil, Eric de Souza [2 ]
Luque, Rafael [3 ,6 ]
机构
[1] Univ Fed Goias, Inst Nacl Ciencia & Tecnol Ciencias Forenses, Inst Quim, Goiania, Go, Brazil
[2] Univ Fed Goias, Fac Farm, Goiania, Go, Brazil
[3] Univ Cordoba, Dept Quim Organ, Cordoba, Spain
[4] Univ Fed Goias, Inst Quim, Goiania, Go, Brazil
[5] Inst Fed Educ Ciencia & Tecnol Espirito Santo, Vitoria, Brazil
[6] RUDN Univ, Peoples Friendship Univ Russia, Moscow, Russia
关键词
Abuse drugs; electrochemical remediation; high efficiency anodes; aqueous media; ILLICIT DRUGS; WASTE-WATER; SURFACE-WATER; MASS-SPECTRA; METABOLITES; ABUSE; BENZOYLECGONINE; SPECTROMETRY; REMEDIATION; ENVIRONMENT;
D O I
10.1002/elan.201800297
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The generalization use of therapeutic and illicit drugs are introducing new several chemical pollutants in water. They have been detected in water and sewage samples worldwide, hence they are considered as emerging pollutants. The increase of water threats has a negative impact on the life quality and human health. Among the illicit drugs, cocaine and derivatives are increasingly present, making efficient detection and elimination of wastewater highly prioritaire. In that sense, the main core of this work is the assessment of a novel cost-efficient electrochemical method based on substrate electro-oxidation (EO) using low-cost anodes based on common graphite modified with TiO2 nanosized particles incorporated on the surface by assisted microwave deposition. Two different diameters (2 and 5nm) of nanostructured TiO2@C anodes were tested for cocaine EO reaction using three different electrolytic solutions (NaCl 50mM, Na2SO4 50mM or Na2SO4 100mM). In all cases, the electrochemical oxidation of cocaine appears to be a combination of hypsochromic and hyperchromic processes. Reaching ca. 90% degradation after 10 minutes for all electrodes, an enhanced efficiency was especially observed for the system with higher cylindrical diameter and NaCl salt medium. The differential pulse (DP) voltammogram, carried out with all assay solutions after 10 minutes of anodic remediation at both electrodes, exhibited an anodic peak consistent with catechol like compounds.
引用
收藏
页码:2094 / 2098
页数:5
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