Remoção de antibióticos da água por meio do processo de adsorção em carvão ativado
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Data
2012-02-28
Autores
Silva, Niléia Cristina da [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Este trabalho trata da remoção de fármacos da água por meio do processo de adsorção, utili- zando como adsorvente o carvão ativado obtido da casca de coco da baía. Os fármacos utili- zados foram os antibióticos Amoxicilina, Ampicilina, Cefalexina e Ciprofloxacina. O adsor- vente de carvão ativado foi caracterizado por análise textural, determinação dos grupos funci- onais da superfície pelo método de titulação de Boehm e por FTIR e determinação do pH de ponto de carga zero (pHPCZ). Foi observado que o carvão apresenta uma área superficial de 745,38 m2/g , é constituído principalmente por microporos, é levemente alcalino (pHPCZ: 7,58) e possui tanto grupos funcionais ácidos como básicos em sua superfície. Os resultados mos- traram que a eficiência de remoção não sofre influência significativa do pH na faixa de 2 a 10. Os experimentos de adsorção foram realizados pelo processo de batelada, onde soluções aquosas de cada antibiótico foram colocadas em contato com diferentes dosagens de carvão ativado (0,05 a 2 g) a temperatura ambiente. As concentrações dos fármacos foram determi- nadas por cromatografia líquida de alta eficiência (HPLC), usando como fases móveis água e metanol em sistema de bombeamento gradiente. Os resultados de exatidão (repetibilidade), dos limites de detecção e de quantificação da técnica analítica demonstraram a aplicabilidade do método. A eficiência de remoção foi superior a 90% para todos os antibióticos. O equilí- brio de adsorção dos antibióticos foi alcançado após 4h e foi expresso por meio de isotermas de adsorção de acordo com os modelos de Langmuir, Freundlich, Temkin e D-R. A isoterma de Langmuir foi a que melhor representou os dados experimentais da adsorção dos antibióti- cos em carvão ativado. A cinética de adsorção dos fármacos foi discutida...
This report is about medicine removal from water by using adsorption process, employing activated carbon as absorvent obtained from baía coconut nutshell. The medicines used were the antibiotics Amoxillin, Ampicillin, Cephalexin and Ciprofloxacin. The activated carbon adsorbent was characterized by textural analysis, surface functional group determination by Boehm and FTIR titration method and the pH of point of zero charge (pHpzc) determination. It was observed that carbon presents a 745,38 m2/g superficial area, its essentially composed by micropores, its slightly alkaline (pHpzc: 7,58) and owns either acidy or basic functional groups on its surface. The results showed that removal performance does not suffered signifi- cant influence from pH on a group from 2 to 10. The adsorption experiments were accom- plished by batch process, where watery solutions from each antibiotic were in touch with dif- ferent activated carbon doses (0,05 to 2 g) and environmental temperature. The medicine con- centrations were determined by high performance liquid chromatgraphy (HPLC), employing water as moving phases and gradient methanol pump system. The accuracy results (repeata- bily), detection limits and quantification of analytic technique presented the aplicability of the method. The removal performance was higher thn 90% to all antibiotic. The adsorption bal- ance of antibiotics was reached after 4 hours and it was expressed by adsorption isotherms according to Langmuir, Freundlich, Temkin and D-R models. Langmuir isotherm best repre- sented experimental data of antibiotic adsorption on activated carbon. The adsorption kinec- tics of medicines was discussed employing pseudo first and second order kinetic models, by Elovich and intraparticle difussion. The kinectic model of pseudo second order can better de- scribe medicine... (Complete abstract click electronic access below)
This report is about medicine removal from water by using adsorption process, employing activated carbon as absorvent obtained from baía coconut nutshell. The medicines used were the antibiotics Amoxillin, Ampicillin, Cephalexin and Ciprofloxacin. The activated carbon adsorbent was characterized by textural analysis, surface functional group determination by Boehm and FTIR titration method and the pH of point of zero charge (pHpzc) determination. It was observed that carbon presents a 745,38 m2/g superficial area, its essentially composed by micropores, its slightly alkaline (pHpzc: 7,58) and owns either acidy or basic functional groups on its surface. The results showed that removal performance does not suffered signifi- cant influence from pH on a group from 2 to 10. The adsorption experiments were accom- plished by batch process, where watery solutions from each antibiotic were in touch with dif- ferent activated carbon doses (0,05 to 2 g) and environmental temperature. The medicine con- centrations were determined by high performance liquid chromatgraphy (HPLC), employing water as moving phases and gradient methanol pump system. The accuracy results (repeata- bily), detection limits and quantification of analytic technique presented the aplicability of the method. The removal performance was higher thn 90% to all antibiotic. The adsorption bal- ance of antibiotics was reached after 4 hours and it was expressed by adsorption isotherms according to Langmuir, Freundlich, Temkin and D-R models. Langmuir isotherm best repre- sented experimental data of antibiotic adsorption on activated carbon. The adsorption kinec- tics of medicines was discussed employing pseudo first and second order kinetic models, by Elovich and intraparticle difussion. The kinectic model of pseudo second order can better de- scribe medicine... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Adsorção, Carbono ativado, Antibioticos, Antibiotics
Como citar
SILVA, Niléia Cristina da. Remoção de antibióticos da água por meio do processo de adsorção em carvão ativado. 2012.. 95 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Engenharia de Ilha Solteira, 2012..