Preparation of a porous biochar from the acid activation of pork bones
| Autor: | J.L. Ayastuy, Irene Sierra, Lorena Zudaire, Unai Iriarte-Velasco |
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| Rok vydání: | 2016 |
| Předmět: |
Reaction mechanism
Bone char Chemistry General Chemical Engineering chemistry.chemical_element 02 engineering and technology Thermal treatment 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry chemistry.chemical_compound Adsorption Biochar Organic chemistry 0210 nano-technology Mesoporous material Carbon Methylene blue 0105 earth and related environmental sciences Food Science Biotechnology Nuclear chemistry |
| Zdroj: | Food and Bioproducts Processing. 98:341-353 |
| ISSN: | 0960-3085 |
| DOI: | 10.1016/j.fbp.2016.03.003 |
| Popis: | A porous biochar was manufactured through the valorization of waste pork bones, following a three-step process including pre-charring under mild conditions, acid treatment and thermal activation. The influence of the acid (H 2 SO 4 and H 3 PO 4 ) and the impregnation ratio on the physicochemical properties of the material was investigated. Acid treatment at 0.2 mmol acid /g precursor increased BET area by about 80%, compared to untreated bone char. When using H 2 SO 4 , higher impregnation ratios significantly enhanced microporosity (up to 263%). This increased microporosity should be associated to a specific reaction mechanism of H 2 SO 4 with a source of carbon. On the contrary, the higher activity of H 3 PO 4 led to a dramatic removal of porosity for large impregnation ratios (about 20 mmol/g). The acid activation mechanism involves the formation of cation-deficient HAp, which is thereafter decomposed upon thermal treatment. The maximum uptake of methylene blue was achieved at low impregnation ratios (0.2 and 1.0 mmol/g), and could be related to surface area corresponding to large micropores and small mesopores. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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