Superhydrophobic and superlipophilic biochar produced from microalga torrefaction and modification for upgrading fuel properties  

作　　者：Congyu Zhang Meng Wang Wei-Hsin H.Chen Ying Zhang Anelie Pétrissans Mathieu Pétrissans Shih-Hsin H.Ho 

机构地区：[1]State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin,China [2]School of Resources and Environment,Northeast Agricultural University,150030 Harbin,China [3]Department of Aeronautics and Astronautics,National Cheng Kung University,701 Tainan,Taiwan,China [4]Research Center for Smart Sustainable Circular Economy,Tunghai University,407 Taichung,Taiwan,China [5]Department of Mechanical Engineering,National Chin-Yi University of Technology,411 Taichung,Taiwan,China [6]Universitéde Lorraine,INRAE,LERMAB,88000 Epinal,France

出　　处：《Biochar》2023年第1期334-348,共15页生物炭（英文）

基　　金：National Science and Technology Council,Taiwan region,under the grant numbers MOST 109-2221-E-006-040-MY3,MOST 110-2622-E-006-001-CC1,and MOST 110-3116-F-006-003-.

摘　　要：Torrefaction operation is an essential pathway for solid biofuel upgrading,and good hydrophobicity of torrefied biochar is conducive to its storage.Herein,a two-stage treatment of torrefaction followed by modification by hexadecyltrimethoxysilane was adopted to improve the moisture resistance performance of biochar.This two-stage treatment process led to a longer torrefied microalgal biochar preservation time(60-200%improved)and great superhydrophobicity and superlipophilicity.Therefore,the modified microalgal biochar could significantly adsorb leaking oil for environmental remediation and further improve the calorific value of the biochar.The obtained results indicated that the oil adsorption capacity of modified microalgal biochar was correlated to torrefaction temperature and oil species.Specifically,the oil adsorption capacity was enhanced up to 70-80%from the modification process when comparing to raw microalga.Increasing the torrefaction temperature enhanced the adsorption quantity of the modified microalgal biochar.By adsorbing the oil,the calorific value of oilchar,namely,biochar with adsorbed oil,could be higher than 40 MJ kg^(−1).Furthermore,the pyrolysis and combustion characteristics suggested that biochar stability gradually rose as the torrefaction temperature increased.By comprehensively analyzing and comparing the fuel performance of the modified microalgal biochar with previous literature,the obtained modified microalgal biochar possessed better fuel properties and environmental sustainability.

关 键 词：MICROALGA TORREFACTION BIOCHAR SUPERHYDROPHOBICITY Oil adsorption Fuel property 

分 类 号：TQ127.11[化学工程—无机化工]