Pretreatment of Wheat Straw with Phosphoric Acid and Hydrogen Peroxide to Simultaneously Facilitate Cellulose Digestibility and Modify Lignin as Adsorbents

Effective valorization of lignin is crucial to achieve a sustainable, economic and competitive biorefinery of lignocellulosic biomass. In this work, an integrated process was proposed based on a concentrated phosphoric acid plus hydrogen peroxide (PHP) pretreatment to simultaneously facilitate cellulose digestibility and modify lignin as adsorbent. As a dominant constitutor of PHP pretreatment, H2O2 input and its influence on the overall fractionation/lignin modification performance was thoroughly investigated. Results indicated that wheat straw was fractionated more efficiently by increasing the H2O2 input. H2O2 input had a significant influence on the digestibility of the obtained cellulose-rich fraction whereby almost 100.0% cellulose-glucose conversion can be achieved even with only 0.88% H2O2 input. Besides, the adsorption capacity of lignin on MB was improved (74.3 to 210.1 mg g−1) due to the oxidative-modification in PHP pretreatment with H2O2 inputs. Regression analysis indicated that –COOH groups mainly governed the lignin adsorption (R2 = 0.946), which displayed the considerable adsorption capacities for typical cationic substances. This work shows a promising way to integrate the lignin modification concept into the emerging PHP pretreatment process with the dual goal of both cellulose utilization and lignin valorization.

Download Full-text

Self-generated peroxyacetic acid in phosphoric acid plus hydrogen peroxide pretreatment mediated lignocellulose deconstruction and delignification

Biotechnology for Biofuels ◽

10.1186/s13068-021-02075-w ◽

2021 ◽

Vol 14 (1) ◽

Author(s):

Dong Tian ◽

Yiyi Chen ◽

Fei Shen ◽

Maoyuan Luo ◽

Mei Huang ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Acetic Acid ◽

Synergistic Effect ◽

Phosphoric Acid ◽

Wheat Straw ◽

Lignin Degradation ◽

Acid Oxidation ◽

Main Function ◽

Corn Stalk ◽

Peroxyacetic Acid

Abstract Background Peroxyacetic acid involved chemical pretreatment is effective in lignocellulose deconstruction and oxidation. However, these peroxyacetic acid are usually artificially added. Our previous work has shown that the newly developed PHP pretreatment (phosphoric acid plus hydrogen peroxide) is promising in lignocellulose biomass fractionation through an aggressive oxidation process, while the information about the synergistic effect between H3PO4 and H2O2 is quite lack, especially whether some strong oxidant intermediates is existed. In this work, we reported the PHP pretreatment system could self-generate peroxyacetic acid oxidant, which mediated the overall lignocellulose deconstruction, and hemicellulose/lignin degradation. Results The PHP pretreatment profile on wheat straw and corn stalk were investigated. The pathways/mechanisms of peroxyacetic acid mediated-PHP pretreatment were elucidated through tracing the structural changes of each component. Results showed that hemicellulose was almost completely solubilized and removed, corresponding to about 87.0% cellulose recovery with high digestibility. Rather high degrees of delignification of 83.5% and 90.0% were achieved for wheat straw and corn stalk, respectively, with the aid of peroxyacetic acid oxidation. A clearly positive correlation was found between the concentration of peroxyacetic acid and the extent of lignocellulose deconstruction. Peroxyacetic acid was mainly self-generated through H2O2 oxidation of acetic acid that was produced from hemicellulose deacetylation and lignin degradation. The self-generated peroxyacetic acid then further contributed to lignocellulose deconstruction and delignification. Conclusions The synergistic effect of H3PO4 and H2O2 in the PHP solvent system could efficiently deconstruct wheat straw and corn stalk lignocellulose through an oxidation-mediated process. The main function of H3PO4 was to deconstruct biomass recalcitrance and degrade hemicellulose through acid hydrolysis, while the function of H2O2 was to facilitate the formation of peroxyacetic acid. Peroxyacetic acid with stronger oxidation ability was generated through the reaction between H2O2 and acetic acid, which was released from xylan and lignin oxidation/degradation. This work elucidated the generation and function of peroxyacetic acid in the PHP pretreatment system, and also provide useful information to tailor peroxide-involved pretreatment routes, especially at acidic conditions. Graphical abstract

Download Full-text

Fractionating Wheat Straw via Phosphoric Acid with Hydrogen Peroxide Pretreatment and Structural Elucidation of the Derived Lignin

Energy & Fuels ◽

10.1021/acs.energyfuels.8b00297 ◽

2018 ◽

Vol 32 (4) ◽

pp. 5218-5225 ◽

Cited By ~ 16

Author(s):

Xue Wan ◽

Dong Tian ◽

Fei Shen ◽

Jinguang Hu ◽

Gang Yang ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Phosphoric Acid ◽

Wheat Straw ◽

Structural Elucidation

Download Full-text

Bioethanol production from wheat straw by phosphoric acid plus hydrogen peroxide (PHP) pretreatment via simultaneous saccharification and fermentation (SSF) at high solid loadings

Bioresource Technology ◽

10.1016/j.biortech.2018.08.009 ◽

2018 ◽

Vol 268 ◽

pp. 355-362 ◽

Cited By ~ 17

Author(s):

Jingwen Qiu ◽

Dong Tian ◽

Fei Shen ◽

Jinguang Hu ◽

Yongmei Zeng ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Phosphoric Acid ◽

Wheat Straw ◽

Simultaneous Saccharification And Fermentation ◽

Bioethanol Production ◽

High Solid ◽

Simultaneous Saccharification

Download Full-text

Pretreating wheat straw by phosphoric acid plus hydrogen peroxide for enzymatic saccharification and ethanol production at high solid loading

Bioresource Technology ◽

10.1016/j.biortech.2017.04.040 ◽

2017 ◽

Vol 238 ◽

pp. 174-181 ◽

Cited By ~ 33

Author(s):

Jingwen Qiu ◽

Lunjie Ma ◽

Fei Shen ◽

Gang Yang ◽

Yanzong Zhang ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Phosphoric Acid ◽

Ethanol Production ◽

Wheat Straw ◽

Enzymatic Saccharification ◽

Solid Loading ◽

High Solid ◽

High Solid Loading

Download Full-text

Optimizing Phosphoric Acid plus Hydrogen Peroxide (PHP) Pretreatment on Wheat Straw by Response Surface Method for Enzymatic Saccharification

Applied Biochemistry and Biotechnology ◽

10.1007/s12010-016-2273-7 ◽

2016 ◽

Vol 181 (3) ◽

pp. 1123-1139 ◽

Cited By ~ 9

Author(s):

Jingwen Qiu ◽

Qing Wang ◽

Fei Shen ◽

Gang Yang ◽

Yanzong Zhang ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Phosphoric Acid ◽

Wheat Straw ◽

Response Surface ◽

Response Surface Method ◽

Enzymatic Saccharification ◽

Surface Method

Download Full-text

Pretreating wheat straw by the concentrated phosphoric acid plus hydrogen peroxide (PHP): Investigations on pretreatment conditions and structure changes

Bioresource Technology ◽

10.1016/j.biortech.2015.07.112 ◽

2016 ◽

Vol 199 ◽

pp. 245-257 ◽

Cited By ~ 27

Author(s):

Qing Wang ◽

Jinguang Hu ◽

Fei Shen ◽

Zili Mei ◽

Gang Yang ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Phosphoric Acid ◽

Wheat Straw ◽

Structure Changes ◽

Pretreatment Conditions

Download Full-text

The Effect of Microwave Treatment on the Hydrogen Peroxide Bleaching of Soda-AQ Wheat Straw Pulp

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.236-238.1307 ◽

2011 ◽

Vol 236-238 ◽

pp. 1307-1312

Author(s):

Chao Jun Wu ◽

Chuan Shan Zhao ◽

Jun Li ◽

Ke FU Chen

Keyword(s):

Hydrogen Peroxide ◽

Wheat Straw ◽

Fiber Length ◽

Weighted Average ◽

Microwave Treatment ◽

Arithmetic Average ◽

Peroxide Bleaching ◽

Bleached Pulp ◽

Infra Red ◽

Wheat Straw Pulp

In this paper, the effect of microwave treatment on the hydrogen peroxide bleaching of Soda-AQ wheat-straw pulp was investigated. The results showed that microwave treatment could increase the brightness of the hydrogen peroxide bleached pulp. The fiber coarseness of microwave enhancing peroxide bleached pulp was higher than that of the peroxide bleached pulp. However, the arithmetic average fiber length, the length weighted average fiber length and weight weighted average fiber length of the former was lower than that of the latter. Fourier transform infra-red spectroscopy (FTIR) and X-ray diffraction (XRD) spectra showed that CrI(%) crystallinity of microwave enhancing peroxide bleached pulp was similar as that of the peroxide bleached pulp but all higher than that of the Soda-AQ wheat-straw pulp. N·O′KI infra-red crystalline index of microwave enhancing peroxide bleached pulp were lower than that of the peroxide bleached pulp. The FTIR spectra of lignin showed that the microwave treatment had some influences on the methoxyl and phenolic group in lignin.

Download Full-text

Integrated Process for Ethanol, Biogas, and Edible Filamentous Fungi-Based Animal Feed Production from Dilute Phosphoric Acid-Pretreated Wheat Straw

Applied Biochemistry and Biotechnology ◽

10.1007/s12010-017-2525-1 ◽

2017 ◽

Vol 184 (1) ◽

pp. 48-62 ◽

Cited By ~ 19

Author(s):

Ramkumar B. Nair ◽

Maryam M. Kabir ◽

Patrik R. Lennartsson ◽

Mohammad J. Taherzadeh ◽

Ilona Sárvári Horváth

Keyword(s):

Phosphoric Acid ◽

Total Energy ◽

Wheat Straw ◽

Ethanol Fermentation ◽

Biogas Production ◽

Waste Stream ◽

Energy Output ◽

Yield Potential ◽

Generation Process ◽

Pretreated Wheat Straw

AbstractIntegration of wheat straw for a biorefinery-based energy generation process by producing ethanol and biogas together with the production of high-protein fungal biomass (suitable for feed application) was the main focus of the present study. An edible ascomycete fungal strain Neurospora intermedia was used for the ethanol fermentation and subsequent biomass production from dilute phosphoric acid (0.7 to 1.2% w/v) pretreated wheat straw. At optimum pretreatment conditions, an ethanol yield of 84 to 90% of the theoretical maximum, based on glucan content of substrate straw, was observed from fungal fermentation post the enzymatic hydrolysis process. The biogas production from the pretreated straw slurry showed an improved methane yield potential up to 162% increase, as compared to that of the untreated straw. Additional biogas production, using the syrup, a waste stream obtained post the ethanol fermentation, resulted in a combined total energy output of 15.8 MJ/kg wheat straw. Moreover, using thin stillage (a waste stream from the first-generation wheat-based ethanol process) as a co-substrate to the biogas process resulted in an additional increase by about 14 to 27% in the total energy output as compared to using only wheat straw-based substrates.

Download Full-text