Removal of bisphenol, using antimony nanoparticle multi-walled carbon nanotubes composite from aqueous solutions

This study focuses on preparing Antimony Nanoparticle Multi-walled Carbon (ANMWC) composite as an effective adsorbent and then the effect of produced composite in BPA removal from aqueous solutions was studied. ANMWC were prepared using chemical method and characterized with X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR) and Brunauer-Emmett-Teller (BET). Moreover, the removal efficiency of prepared AMWCNT and Nanoparticle Multi-walled Carbon (MWCNT) in removal of Bisphenol A was investigated. Results revealed that the BPA removal efficiency by AMWCNT increased from 80 to 93 with the increase of contact time 5 to 60 min. The maximum removal efficiency for the both adsorbents was seen at pH 7, which was 85 for MWCNT and 95 for ANMWC composite. According to the results obtained, pHzpc for both adsorbents was 7. Results showed that the adsorption process followed the pseudo-first order model with a high correlation value and BPA adsorption on MWCNT followed the Langmuir isotherm model

Kinetic and adsorption studies of reactive black 5 removal using multi -walled carbon nanotubes from aqueous solution

The removal of reactive black 5 (RB5) from aqueous solutions by adsorption onto multi-walled carbon nanotube (MWCNT) was studied. The effects of some operating parameters such as solution pH, initial dye concentration, adsorbent dosage and adsorption capacity on the adsorption of RB5 were investigated. It was found that RB5 removal by adsorption onto MWCNT was best achieved at natural pH. The adsorption efficiency of RB5 by MWCNT decreased with increasing initial dye concentration, while the increase of adsorbent dosage resulted in an increase of decolorization efficiency. The maximum adsorption capacity was reached at 36.2 mg/g after 90 min. The results obtained from kinetic studies reflected that RB5 removal fitted well with the second order model. Also, the isotherm data correlate well with the Freundlich model. The findings indicated that MWCNT can be used as a suitable adsorbent for removing dyes from wastewaters