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Removal of Cephalexin From Artificial Wastewater by Mesoporous Silica Materials Using Box-Behnken Response Surface Methodology Publisher



Panahi AH1 ; Ashrafi SD2 ; Kamani H3 ; Khodadadi M1 ; Lima EC4 ; Mostafapour FK3 ; Mahvi AH5
Authors
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Authors Affiliations
  1. 1. Social Determinants of Health Research Center, Birjand University of Medical Sciences, Birjand, Iran
  2. 2. School of Health, Guilan University of Medical Sciences, Rasht, Iran
  3. 3. Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
  4. 4. Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Bento Goncalves, Brazil
  5. 5. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran

Source: Desalination and Water Treatment Published:2019


Abstract

Mesoporous silica such as MCM-41 was used as an adsorbent for the removal of cephalexin antibiotic from synthetic wastewater. In this study, MCM-41 adsorbent was synthesised and was character-ised by FE-SEM, XRD, FTIR and isotherms of adsorption/desorption of N2. The effects of initial pH, adsorbent dose, initial adsorbate concentration, contact time and temperature on process efficiency were evaluated using Box-Behnken statistical experiment design (RSM). FTIR analysis revealed the Si-OH, H-O-H and Si-O-Si bonds are formed. According to BET surface area, MCM-41 had pores with a diameter of more than 2.0 nm and surface area of 1,097 m2g–1 and also XRD spectra showed the mean crystallite size of MCM-41 was 75 nm. The statistical results show that pH, adsorbent dose, initial antibiotic concentration, temperature and quadratic pH were significant and presented with probability <0.05. The optimum removal condition based on analysis of variance and the quadratic model was the initial pH of adsorbate solution fixed at 3.00, adsorbent dose 800 mg L–1, the initial concentration of antibiotic at 50.0 mg L–1, a temperature of 40.0°C, and at the adsorption time of 30.0 min. Under these conditions, the percentage removal of cephalexin antibiotic was 90.3%. Therefore, according to the obtained results, the mesoporous silica can be used to adsorb cephalexin antibiotic in optimal conditions designed by response surface methodology. © 2019 Desalination Publications. All rights reserved.
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