111 / 2021-11-09 20:24:06

welling of Bagasse between Crystals: Enzymatic Hydrolysis and Nanofiber Preparation Strategies

Nano cellulosee; Phosphoric acid with hydrogen peroxide; Physicochemical properties; Cellulase adsorption.

   The climate issue has become a global issue, and reducing carbon dioxide emissions has become the most important issue. Under the current situation, consuming fossil resources to obtain chemicals and fuels for human survival is still a basic way. In order to meet the increasing demands of human activities, non-renewable fossil resources are rapidly consumed. At the same time, the consumption of primary energy has led to concentrated emissions of greenhouse gases, accelerating the continuous escalation of global climate problems. Renewable energy plays a major role in the strategy of reducing carbon dioxide emissions and improving global environmental problems. We found that natural biomass is an effective booster for carbon neutrality, and the continuous surge in demand for high-value commercialization of non-edible substrates contributes to the development trend of sustainable green production. In fact, as the most widely distributed renewable carbon source on the planet, lignocellulose is considered an obvious candidate to replace a large number of chemicals and produce biofuels. In the lignocellulosic biomass, agricultural waste reserves are abundant, and they are often buried or burned on the spot without treatment, which not only causes waste of biomass, but also brings a series of environmental problems. It is necessary to develop an effective way of utilization. As a representative agricultural by-product, bagasse is sustainable, easily available and low-cost, which provides an effective guarantee for its conversion into high-value products including biofuels. This study evaluated the effect of the physicochemical properties of bagasse lignocellulosic fibers pretreated with a series of phosphoric acid-hydrogen peroxide on the production of cellulase-assisted nanocellulose and glucose production. The relationship between enzyme-assisted nanocellulose production and cellulase adsorption and initial hydrolysis rate was discussed. We found that effectively breaking the three-dimensional network structure of lignocellulose, increasing hydrolysis accessibility, inhibiting hydrophobicity and surface charge are key factors that affect the adsorption of cellulase on pretreated cellulose. The results show that the glucose yield is positively correlated with the specific surface area, and negatively correlated with the particle size and degree of polymerization. Among these characteristics, the specific surface area and particle size are the key factors affecting the production of glucose. As the pretreatment progresses, the amount of enzyme adsorption/bound enzyme amount of lignocellulose in the initial stage of hydrolysis decreases, but the initial hydrolysis rate is higher, and nanocellulose is more likely to be generated.