Graphene oxide/zinc oxide nanocomposite: A superior adsorbent for removal of methylene blue - statistical analysis by response surface methodology (RSM)
| Autor: | Shabnam Babaei, Sepideh Mashaykhi, Seyed Ali Hosseini |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Oxide
chemistry.chemical_element 02 engineering and technology Carbon nanotube Zinc 010501 environmental sciences response surface design 01 natural sciences law.invention chemistry.chemical_compound Adsorption law Response surface methodology 0105 earth and related environmental sciences Nanocomposite Chromatography Graphene nano composite 021001 nanoscience & nanotechnology chemistry Chemical engineering graphene oxide methylene blue 0210 nano-technology Methylene blue |
| Zdroj: | South African Journal of Chemistry, Volume: 69, Pages: 105-112, Published: 2016 |
| ISSN: | 1996-840X |
| DOI: | 10.17159/0379-4350/2016/v69a13 |
| Popis: | Graphene oxide (GO) was synthesized from natural graphite using the Hummers method. Graphene oxide/zinc oxide nano composite were synthesized by mixing of GO and ZnO solutions and then freeze drying. The adsorptive performance of the nano composite was investigated in the removal of methylene blue. The statistical study of the adsorption process was carried out by response surface methodology (RSM). Experimental variables such as sample pH, adsorption time, dye concentration and adsorbent dosage were considered for the optimization process. The process was optimized by response surface methodology (RSM) through Box-Benhken method. The optimum conditions, predicted by the RSM were obtained at pH, contact time, initial dye concentration and adsorbent dosage of 6,8.5 min, 5 ppm, 0.02 g, respectively. The removal of methylene blue under optimum conditions was predicted to be 98.17 % and resulted in 97 % in practice. The Pareto analysis suggested that order of relative importance of the factors were as follows: adsorbent dosage > dye concentration > adsorption time > pH. Under optimized conditions, GO/ZnO nano composite showed a higher capacity than GO, carbon nanotube (CNT), ZnO and ZnO/CNT for adsorption of methylene blue. The study revealed that GO/ZnO could be a promising adsorbent for removal of industrial dyes from wastewaters. |
| Databáze: | OpenAIRE |
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