Physicochemical characterization of rice straw before and after alkali-assist photocatalytic pretreatment: a comparative analysis.
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| Title: | Physicochemical characterization of rice straw before and after alkali-assist photocatalytic pretreatment: a comparative analysis. |
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| Authors: | Sethi, Nisha1 (AUTHOR), Luhach, Neha1 (AUTHOR), Kirrolia, Anita Singh1 (AUTHOR), Gupta, Asha1 (AUTHOR), Bishnoi, Narsi Ram1 (AUTHOR), Dhull, Sanju Bala2 (AUTHOR), Rose, Pawan Kumar3 (AUTHOR) pawankumarrose@gmail.com |
| Source: | Environmental Science & Pollution Research. Nov2025, Vol. 32 Issue 52, p29581-29591. 11p. |
| Subject Terms: | *Rice straw, *Delignification, *Photocatalysts, *Cellulose, *Fourier transform infrared spectroscopy, *Plant biomass, *Analytical chemistry, *X-ray diffraction |
| Abstract: | The potential of alkali-assist photocatalytic (AAP) pretreatment to overcome the recalcitrant nature of lignocellulose biomass, i.e. rice straw (RS), was investigated in the present study. Box-Behenken Design (BBD) using standard response surface methodology (RSM) approach was considered to obtain optimal conditions for maximum delignification. The model was designed with three variables: alkali concentration (NaOH, 0–3% w/v), photocatalyst (TiO2 NPs (titania nanoparticles), 0–1 g/L) and pretreatment time (30–240 min). The availability of cellulose was increased by 96.73%, while the concentration of lignin and hemicellulose decreased by 73.89%, and 71.79%, respectively, at a combination of 1.5% NaOH, 0.5 g/L TiO2 NPs and 135 min pretreatment time. The structural and morphological alterations in the RS were assessed via Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) both before and after AAP pretreatment. The FTIR measurement indicated that the original RS included a significant quantity of lignin, which was eliminated after the pretreatment procedure. The XRD pattern demonstrates that cellulose crystallinity is significantly affected by the pretreatment. The SEM analysis revealed structural distortion and surface porosity from the pretreatment procedure. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | The potential of alkali-assist photocatalytic (AAP) pretreatment to overcome the recalcitrant nature of lignocellulose biomass, i.e. rice straw (RS), was investigated in the present study. Box-Behenken Design (BBD) using standard response surface methodology (RSM) approach was considered to obtain optimal conditions for maximum delignification. The model was designed with three variables: alkali concentration (NaOH, 0–3% w/v), photocatalyst (TiO2 NPs (titania nanoparticles), 0–1 g/L) and pretreatment time (30–240 min). The availability of cellulose was increased by 96.73%, while the concentration of lignin and hemicellulose decreased by 73.89%, and 71.79%, respectively, at a combination of 1.5% NaOH, 0.5 g/L TiO2 NPs and 135 min pretreatment time. The structural and morphological alterations in the RS were assessed via Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) both before and after AAP pretreatment. The FTIR measurement indicated that the original RS included a significant quantity of lignin, which was eliminated after the pretreatment procedure. The XRD pattern demonstrates that cellulose crystallinity is significantly affected by the pretreatment. The SEM analysis revealed structural distortion and surface porosity from the pretreatment procedure. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09441344 |
| DOI: | 10.1007/s11356-024-33647-6 |
