SciELO - Scientific Electronic Library Online

 
vol.38 número5Seasonal variations of water and sediment quality parameters in endorheic reed pans on the Mpumalanga HighveldAerobic biotransformation of 2, 4, 6-trichlorophenol by Penicillium chrysogenum in aqueous batch culture: degradation and residual phytotoxicity índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Artigo

Indicadores

Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Em processo de indexaçãoSimilares em Google

Compartilhar


Water SA

versão On-line ISSN 0378-4738

Resumo

BAJPAI, Sunil Kumar; BAJPAI, Manjula  e  RAI, Neelam. Sorptive removal of ciprofloxacin hydrochloride from simulated wastewater using sawdust: Kinetic study and effect of pH. Water SA [online]. 2012, vol.38, n.5, pp. 673-682. ISSN 0378-4738.

The present work describes dynamic uptake of the antibiotic drug ciprofloxacin hydrochloride (CH), by using a cost-effective agricultural by-product - sawdust (SD). The sawdust was characterised by FTIR and SEM analysis. The sorbent particles were highly porous with average pore diameter of nearly 10 μm. The optimum pH and solid/liquid ratio for sorption of CH were found to be 5.8 and 2.0, respectively. The dynamic drug uptake data was applied to various kinetic models and their order of fitness was found to be pseudo second order > Elovich equation > power function model, as indicated by their regression values. The experimental equilibrium uptake values (q ) were in close agreement with those evaluated from the pseudo second order equation for initial sorbate concentrations of 10 and 20 mg-l-1 at 33°C. The drug uptake mechanism was found to be attractive non-electrostatic interactions, involving H-bonding interactions between H atoms and other electronegative species such as F, O and N of the drug molecule. The mechanism is discussed on the basis of pHpzc of sawdust and zwitterionic nature of drug CH. Mass transfer analysis was carried out using the drug uptake data obtained with sorbate concentrations of 10 and 20 mg-l-1. The used sorbent could be regenerated using 1.0 moll-1 HCl solution with a regeneration efficiency of nearly 85%.

Palavras-chave : sawdust; antibiotic drug; pseudo second order; intra-particle diffusion; mass transfer analysis.

        · texto em Inglês     · Inglês ( pdf )