Biochar Catalyzed Hydrogen Peroxide And Applied To The Degradation Sulfamethazine In Water

In recent years,so much focus on biochar,because it shows tremendous potential in agro-forestry production,energy and chemical industry,carbon sequestration and environmental restoration.Biochar,a fascinating carbon-rich material,has been widely used in organic pollutants and heavy metal adsorption in the research and application of environmental restoration,due to its large surface area,complex porosity,convenience for preparation and low cost Less publications have explored the performance of biochar on organic contaminants degradation.Hydrogen peroxide advanced oxygen technology is dependent on hydroxyl radical to effectively degrade the hardly-degraded organic pollutants in water,it shows a good space for development in remediation of water environment.This study used biochar catalyzed hydrogen peroxide at ambient temperature and atmospheric pressure,and it has been used to degrade sulfamethazine(SMT)in water,which is refractory to degrade.The main contents and results of experiments are as following.(1)In this study,biochars were produced at six pyrolysis temperatures(300,400,500,600,700,and 800?),and the morphological structure and surface chemistry and other physical and chemical properties of these biochars were investigated.The results showed,1)a part of physical and chemical properties of biochars were positively correlated with pyrolysis temperatures,such as ash content,pH,specific surface area,porosity,and surface basicity.2)a part of physical and chemical properties of biochars were negative correlated with pyrolysis temperatures,such as yields,volatile matter,surface acidity,and H/C,O/C molar ratios.(2)In this study,biochars,which were produced at six pyrolysis temperatures,were used to catalyze H2O2,the feasibility of biochar applied in H2O2 catalytic decomposition was investigated,the catalytic decomposition rate of H2O2 and generation of hydroxyl radical(·Oh)were both used to evaluated the effects,and the influence of morphological and chemical features of biochar on H2O2 activation was also studied.The results showed,1)when hydrogen peroxide exist alone,no decomposition reaction of H2O2 and generation of ·OH,but in the system biochar/H2O2,the catalytic decomposition rate of H2O2 rose dramatically,with the generation of ·OH.2)the biochars,which were produced at higher pyrolysis temperatures,were more helpful to promote the decomposition of H2O2 and generation of ·OH.3)he morphological structure and surface chemistry of biochar,reaction temperature,the concentration of H2O2,and the dosage of biochar had significant impacts on H2O2 activation of biochar.(3)In this study,the feasibility of the system of Biochar/H2O2 applied in the degradation of SMT,the relationship between pyrolysis temperatures and the effects of SMT degradation,and the effect of the adsorption of SMT on H2O2 activation of biochar were investigated.Therefore,the repeated utilization factor of biochar in the system of Biochar/H2O2 was also studied.The results showed,1)the system of Biochar/H2O2 showed a good performance on SMT degradation,and the degradation efficiency was positively associated with the pyrolysis temperature.2)biochars'reactivity toward H2O2 was inhibited by the adsorption of SMT on their surface.3)in the system of Biochar/H2O2,the repeated utilization factor of biochar was bad.