Análise da influência do alquilbenzeno sulfonato linear (las) na agregação, sedimentação e coagulação química das nanopartículas de óxido de zinco em matriz aquosa

• Autor(a) principal: Guimarães, Dáfnis Barsanulfa Vieira
• Data de Publicação: 2020
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/0013000002pxm
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/11014
• topic: Alquilbenzeno sulfonato linear; Nanopartículas de óxido de zinco; Agregação; Coagulação; Linear alkylbenzene sulfonate; Zinc oxide nanoparticles; Aggregation; Coagulation; ENGENHARIAS::ENGENHARIA SANITARIA

With the widespread use of anionic surfactant alkylbezene linear sulfonate (LAS) and nanoparticles of zinc oxide (NP ZnO) it becomes probable the coexistence of both compounds in the aquatic environment, showning the importance of the present work in studying the effect of LAS in nanoparticles ZnO. This study was divided into 3 stages that consisted of analyzing the influence of LAS on aggregation, sedimentation, zero charge point (PCZ) and removal of nanoparticles in the coagulation process. The induced results that LAS influence the aggregation and sedimentation of nano-ZnO, mainly in LAS practices above 100mg / L. Sedimentation data were adjusted (R² without 0.85-0.99 interval) with a kinetic equation of first order with residual. The surfactant did not interfere significantly in the pHPCZ of the nano-ZnO, but both coagulants, ferric chloride and tannin, showed better results when the coagulation process with pH was close to the pHPCZ calculated. The presence of LAS in the suspension significantly influenced the efficiency of the coagulation process, in application of 300mg / L the removal efficiency was below the 5% evaluated at different pH and with two different coagulants. This study can contribute to demonstrate that the presence of LAS can alter the behavior of nano-ZnO and significantly reduce the efficiency of the coagulation process.