The enhancement of pretreatment and enzymatic hydrolysis of corn stover by FeSO4 pretreatment

Zhao, Jing; Zhang, Hongman; Zheng, Rongping; Zhang, Lin; Huang, He

doi:10.1016/j.bej.2011.06.002

Cited by 64 publications

(50 citation statements)

References 24 publications

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“…A BioRad Aminex HPX-87H column was used for quantification of concentrations of sugars. The mobile phase of the column was 0.05 mol·L − 1 H 2 SO 4 at a flow rate of 0.6 ml·min −1 and the column temperature was 65°C [25].…”

Section: Analytical Proceduresmentioning

confidence: 99%

Preliminary evaluation of five elephant grass cultivars harvested at different time for sugar production

Zhang

Zheng

et al. 2015

Chinese Journal of Chemical Engineering

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Section: Analytical Proceduresmentioning

confidence: 99%

Preliminary evaluation of five elephant grass cultivars harvested at different time for sugar production

Zhang

Zheng

et al. 2015

Chinese Journal of Chemical Engineering

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“…Compared with single-charge protons (+1) from typical mineral acids (e.g., HCl or H2SO4), transition metal ions with higher valence states (e.g., +2, +3) can efficiently hydrolytically cleave the extensive network in the cellulose fibers. This indicates that more protons are available to pair with more oxygen atoms to render an extensive reduction in particle size by breaking the glycosidic linkages in the cellulose structure (Zhao et al 2011). In nature, the depolymerization process occurred in a faster rate on the defects structure in cellulose matrix as there is randomly ordered and more active sites for chemical degradation process to happen.…”

Section: Morphological Study (Afm Analysis)mentioning

confidence: 99%

Preparation of Nanostructured Cellulose via Cr(III)- and Mn(II)-Transition Metal Salt Catalyzed Acid Hydrolysis Approach

Chen¹,

Lee²,

Hamid³

2016

BioResources

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Nanostructured cellulose was successfully prepared from native cellulose using a homogeneous catalytic H2SO4 hydrolysis pathway in the presence of Cr(III)-and Mn(II)-transition metal salts as the co-catalyst. The effect of transition metal salts with different valence states (Cr 3+ and Mn 2+) on the physicochemical properties (chemical characteristics, crystallinity index, nano-structure, thermal stability, and morphology) of prepared nanocellulose was investigated. Interestingly, TEM micrographs showed that the Cr(III)-treated and Mn(II)-treated nanocellulose exhibited a weblike nanostructured-surface with average diameters of 44.7 ± 13.2 nm and 58.4 ± 15.3 nm, respectively. XRD study revealed that the crystallinity of nanocellulose was increased because the catalytic degradation of the less crystalline regions of cellulose occurred at a faster rate than its crystalline phases. Cr(III)-treated nanocellulose was capable of rendering a higher crystallinity index (75.6 ± 0.1%) compared with Mn(II)-treated nanocellulose (72.3 ± 0.4%). Furthermore, a dynamic light scattering (DLS) study revealed that Cr(III)-treated nanocellulose showed a smaller distribution range (92% at 14 to 135 nm) compared with Mn(II)-treated nanocellulose (92% at 607 nm). A higher valence state for the Cr(III)-cation, with a trivalent state (+3), rendered a more effective hydrolysis reaction compared with the Mn(II)-cation, with a divalent state (+2), for preparing the nanocellulose.

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“…Eventually the ordered structure of cellulose fiber was reduced, decreasing the crystallinity index of yielded nanocellulose. Prolonging the reaction time could further enhance the crystallinity index of obtained nanocellulose; however, the hydrolysis time must be controlled to minimize over-depolymerization hydrolysis of cellulose (Zhao et al 2011). Abd Hamid et al (2014) discouraged increasing the reaction time to produce nanocellulose, as it might decrease the nanocellulose crystallinity and yield (Abd Hamid et al 2014).…”

Section: Effect Of Hydrolysis Variables By Rsm Optimization Studymentioning

confidence: 99%

“…Furthermore, the Cr 3+ metal ions were absorbed onto the oxygen atoms of the glucose unit in cellulose to form intermediate complexes. This interaction lowers the activation energy of hydrolysis by increasing the pyranose bond length and its bond angle (Zhao et al 2011). Thus, the metal ion catalyst could further enhance the efficiency of hydrolysis.…”

Section: Effect Of Hydrolysis Variables By Rsm Optimization Studymentioning

confidence: 99%

A Response Surface Methodology Study: Effects of Trivalent Cr3+ Metal Ion-Catalyzed Hydrolysis on Nanocellulose Crystallinity and Yield

Chen¹,

Lee²,

Hamid³

2016

BioResources

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The preparation of nanocellulose via Cr(NO3)3-assisted sulfuric acid hydrolysis was optimized using response surface methodology (RSM). The experiment was performed using a five-level, four-factor central composite design coupled with RSM in order to optimize nanocellulose crystallinity and product yield. Four factors were evaluated for the preparation of nanocellulose: (1) reaction temperature, (2) hydrolysis time, (3) Cr(NO3)3 concentration, and (4) H2SO4 concentration. Based on the RSM model, the maximum yield and highest crystallinity of nanocellulose was obtained under hydrolysis conditions of 82.2 °C, 0.22 M Cr(NO3)3, and 0.80 M H2SO4 with 1 h of reaction. Furthermore, the physicochemical properties of the obtained nanocellulose were examined, revealing that the amorphous regions were successfully hydrolyzed, while the crystalline region remained unaltered. Morphology analysis also showed that the nanocellulose was an interconnected web-like network. Thus, both H2SO4 and Cr(III) metal salt concentration were important factors that influenced the nanocellulose yield and crystallinity index.

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The enhancement of pretreatment and enzymatic hydrolysis of corn stover by FeSO4 pretreatment

Cited by 64 publications

References 24 publications

Preliminary evaluation of five elephant grass cultivars harvested at different time for sugar production

Preliminary evaluation of five elephant grass cultivars harvested at different time for sugar production

Preparation of Nanostructured Cellulose via Cr(III)- and Mn(II)-Transition Metal Salt Catalyzed Acid Hydrolysis Approach

A Response Surface Methodology Study: Effects of Trivalent Cr3+ Metal Ion-Catalyzed Hydrolysis on Nanocellulose Crystallinity and Yield

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