Novel biosynthesized silver nanoparticles from cobweb as adsorbent for Rhodamine B: equilibrium isotherm, kinetic and thermodynamic studies
| Autor: | Agbaje Lateef, Segun A. Adebisi, Abdulrasaq O. Oyedeji, Luqmon Azeez |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Langmuir
Biosynthesized AgNPs 02 engineering and technology Wastewater 010402 general chemistry 01 natural sciences pH point of zero charge Silver nanoparticle symbols.namesake chemistry.chemical_compound Adsorption lcsh:Water supply for domestic and industrial purposes Spontaneity of adsorption Monolayer Rhodamine B Freundlich equation Adsorption isotherm Water Science and Technology lcsh:TD201-500 Chemosorption technology industry and agriculture Langmuir adsorption model Sorption 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry symbols 0210 nano-technology Nuclear chemistry |
| Zdroj: | Applied Water Science, Vol 8, Iss 1, Pp 1-12 (2018) |
| ISSN: | 2190-5495 2190-5487 |
| DOI: | 10.1007/s13201-018-0676-z |
| Popis: | This study has investigated the adsorption of Rhodamine B (Rh-B) dye on novel biosynthesized silver nanoparticles (AgNPs) from cobweb. The effects of contact time, initial pH, initial dye concentration, adsorbent dosage and temperature were studied on the removal of Rh-B and they significantly affected its uptake. Adsorption isotherms were evaluated using Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherm models. The adsorption process was best described by Langmuir isotherm with R 2 of 0.9901, indicating monolayer adsorption. The maximum adsorption capacity (q max) of 59.85 mg/g showed that it has relatively high performance, while adsorption intensity showed a favourable adsorption process. Pseudo-second-order kinetics fitted best the rate of adsorption and intra-particle diffusion revealed both surface adsorption and intra-particle diffusion-controlled adsorption process. Negative values of thermodynamic parameters (∆H°, ∆S° and ∆G°) indicated an exothermic and spontaneous adsorption process. The mean sorption energy (E) and activation energy (E a) suggested the uptake of Rh-B onto AgNPs was chemical in nature (chemosorption). |
| Databáze: | OpenAIRE |
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