Wheat straw produced annually in the Shaanxi Guanzhong region is a potential biomass feedstock for the production of transportation fuels and specialized chemicals through combustion, pyrolysis, or gasification. In this work, the pyrolytic characteristics, evolved gas products, and kinetics of Guanzhong wheat straw and its components were first investigated with a thermogravimetry-Fourier infrared spectroscopy (TG-FTIR) system. A comparative kinetic study was conducted using different model-free methods of Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS), Kissinger, and the Coats-Redfern methods. The main pyrolysis products identified by FTIR include H2O, CH4, CO2, and CO as well as aromatics, acids, ketones, and aldehydes. Kinetic results showed that the pyrolytic apparent activation energy of the straw is approximately 200 kJ/mol obtained via FWO and KAS methods at the conversion range of 0.4 to 0.75, which was 30 kJ/mol higher than the value 171.1 kJ/mol obtained by the Kissinger method. The apparent activation energy of cellulose in its main pyrolysis region is 135.5 kJ/mol and is about three times larger than that of hemicellulose (49.5 kJ/mol). The apparent activation energy of lignin at the temperature range of 45 to 116 °C was 34.5 kJ/mol, while that value at the temperature range of 120 to 252 °C was 6.64 kJ/mol.
The objective of this study was to maximize the biofuel content of water hyacinth obtained from microwave pyrolysis of. Box-Behnkenof response surface methodology was applied for the experimental design. Under the optimal condition: 1110W of power, 3.5m of reaction time, 2% of the amount of the absorbent, the maximum biofuel content from microwave pyrolysis of water hyacinth was 20.17%.
Abstract:Water hyacinth is an invasive plant which breeds very quickly. It had led to many adverse environmental events such as river blockages and fish endangerment. This study used microwave to pyrolysis water hyacinth and activate it to produce heavy metal absorbent and improve the removal of Pb(Ⅱ). Compared with conventional method, it simplify the produce process, As the dose increased to 0.25g, the absorption efficiencies of two absorbents all achieved to nearly 100%.The results indicated that the adsorption ability of WHB is close to AWHB.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.