A Ziziphus jujuba waste-derived biochar as a low-cost adsorbent for the removal of Indigo carmine dye from aqueous solution
In this work, a local Algerian agricultural waste biomass, Ziziphus jujuba, was valorized into a new low-cost biochar (JB). The biochar was produced by a simple pyrolysis at 700°C for 1 h under an inert atmosphere and was used as a low-cost adsorbent to remove Indigo carmine dye (IC) from aqueous so...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/418065 |
| Acceso en línea: | http://hdl.handle.net/10261/418065 https://api.elsevier.com/content/abstract/scopus_id/85166269254 |
| Access Level: | acceso abierto |
| Palabra clave: | Adsorbent Biochar Indigo carmine Isotherms Kinetic Thermodynamic Ziziphus jujuba |
| Sumario: | In this work, a local Algerian agricultural waste biomass, Ziziphus jujuba, was valorized into a new low-cost biochar (JB). The biochar was produced by a simple pyrolysis at 700°C for 1 h under an inert atmosphere and was used as a low-cost adsorbent to remove Indigo carmine dye (IC) from aqueous solution. The JB biochar was characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy-energy-dispersive X-ray spectroscopy, X-ray diffraction, Raman, pHpzc , and Brunauer–Emmett–Teller physico-chemical techniques. Adsorption studies were conducted using a batch process to study the effects of contact time, adsorbent amount, initial IC dye concentration, initial pH, ionic strength, and temperature. The Langmuir, Freundlich, and Temkin isotherm models were used to analyze equilibrium adsorption data, while the pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models were used to analyze kinetic data. The equilibrium data was well fitted to the Freundlich isotherm with an R2 value of 0.974. The theoretical maximum adsorption capacity was found to be 166.46 mg/g at 20°C according to the Langmuir model. The adsorption kinetic was found to follow the pseudo-first-order kinetic model. Thermodynamic study showed that the adsorption of IC onto JB biochar was feasible, spontaneous and endothermic. |
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