ZnO Nanoparticles as an Efficient, Heterogeneous and Ecofriendly Adsorbent for Pollutant Dyes Removal | ||||
| Egyptian Journal of Chemistry | ||||
| Volume 66, Issue 13, December 2023, Page 1749-1757 PDF (955.08 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2023.221828.8232 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Rahma A. Ali   ; Essam M. Ezzo; Suzan A. Hassan; Magda A. El kherbawi; Amira S. Hassan
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| Faculty of Women for Arts, Science and Education Ain Shams University, Asmaa Fahmi St Al Golf, Nasr City, Cairo, 11566, Egypt | ||||
| Abstract | ||||
| The objective of this study is the removal of some environmental hazards from aqueous solutions. Synthetic dyes are pollutants that are harmful to the environment, Contamination of waste water with these dyes produces a slew of issues, including increased toxicity and chemical oxygen demand in the effluent, as well as a negative impact on photochemical phenomena. Two solids of ZnO (I), ZnO (II) had been prepared by both precipitation and sol gel techniques. The samples were investigated by TGA, DTA, XRD, HR-TEM and BET analysis. The SBET analysis for the samples were 33.1 and 70.0 m2/g respectively . TEM analysis proved the nano particles of the prepared solids as the particle size has a range from 36.79 nm – 69.16 nm for ZnO(I) and a range of 25.3 nm – 46.65 nm for ZnO(II). XRD reveal their hexagonal wurtzite structure for both prepared solids. Three different aqueous solutions of methylene blue (MB), ponceau 4R (E124) and tartrazine (E102) dyes were studied at different kinetic conditions . The optimum removal conditions of the dyes had been detected as 99.5%, 100% and 90% for MB, E124 and E102 respectively using nanoparticle ZnO(II) . The equilibrium time is 60 min, optimum pH =12 for M.B and pH=1 for E124 and E102 using 0.0100 g/l of ZnO. Freundlich and Langmuir isotherm models were used to analyze the experimental results. It had been found that Freundlich models fitted well. ZnO (II) shows higher capacity for adsorption . | ||||
| Keywords | ||||
| Precipitation method; Sol-gel method; Methylene blue (M.B); Tartrazine (E102); Ponceau 4R (E124); Adsorption | ||||
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