期刊
BIORESOURCE TECHNOLOGY
卷 284, 期 -, 页码 25-35出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.03.110
关键词
Rice co-products; Hydrolyzed solids; Subcritical technology; Adsorption; Toxic compound
资金
- Coordination for the Improvement of Higher Education Personnel (CAPES)
- National Council of Technological and Scientific Development [CNPq: 409583/2018-9]
- Research Support Foundation of the State of Rio Grande do Sul [FAPERGS: 16/2551-0000522-2, 17/2551-0000893-6]
- CNPq [304882/2018-6]
The potential of rice husks and straw as adsorbents after being processed by subcritical water hydrolysis (SWH) was investigated. The influences of temperature (453, 493 and 533 K) and liquid/solid ratio (7.5 and 15 g water/ g biomass) on the rice straw and rice husks characteristics and on the adsorption capacity of 2-nitrophenol were evaluated at pH 4 and 7. Adsorption kinetics, equilibrium and thermodynamic parameters were also studied. The adsorption capacity was favored at pH 7. Pseudo-first-order model was suitable to predict the kinetic curves for 2-nitrophenol concentrations of 25, 50, 75 and 100 mg/L and the isotherm data obeyed the Freundlich model. Overall, the thermodynamic results revealed a spontaneous and exothermic process. The maximum adsorption capacity (92.97 +/- 1.31 mg/g) was obtained for rice straw that has undergone an SWH at 453 K and 7.5 g water/g straw. The integration of processes to valorize co-products can make the production of cellulosic bioethanol more feasible.
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