Preparation Of Modified Composite Material TiO₂/C And Research On The Photocatalytic Degradation Of Musk Ketone

Synthetic musk has become a substitute for natural musk because of more advantages than natural musk,and widely used.Much of its emissions bring potential risks to the envi-ronment,the synthetic musk had been detected in the field of environment by researchers.Its presence in water is quite worrisome,while the traditional treatment methods can't effectively remove them.TiO₂ in organic processing shows excellent performance,because of that better catalytic activity,no toxic side effects,strong stability,semifinished material availability and widely used.But it also has a large band gap,low utilization of sunlight;photogenerated elec-tron-hole complex defects easy.Based on the underground,in this paper the titanium tetrachloride is selected as titanium source and the furfural is selected as the carbon source,using the sol-gel method,after aging,solvent exchange,supercritical drying,carbonization process prepared TiO₂/C photocatalytic materials.The material is characterized by the XRD,SEM&EDS,TEM,IR,TG and other ways and the active brilliant red X-3B and the degradation of Rhodamine B were as an object,to assess the sample photocatalytic capability.At the same time focusing on the photocatalytic degradation process of musk ketone are studied,the effect of pH,catalyst dosage,H₂O₂ con-tent and other factors are investigated;the degradation process of intermediates,reaction k i-netics,and degradation mechanism were analyzed.Experimental results are as follows:1)Characterization shown that the composite material has a high specific surface ar-ea?150-200m²/g?,uniform particle distribution,strong adsorption capacity,high proportion of anatase,and the carbon element in the form of amorphous carbon incorporated into TiO₂;the experiment of evaluating the performance of the photocatalytic degradation of materials dis-played,TiO₂/C composites modified material can effective degradation of organic pollutants under visible degradation,During 120min,reactive Red X-3B were degraded and the deg-radation rate of Rhodamine B has reached more than 80%,and non-selective degradation;Adsorption experiments showed that the Langmuir isotherm model similar.2)The degradation experiment shown that when the pH is acidic,TiO₂/C composites modified dosage of 10mg/50ml?1mg/L musk ketone solution?,H₂O₂ content of 5ml,5mmol/L,degradation time 120min,under the 800W xenon lamp irradiation,the degradation effect of musk ketone is ideal,the degradation rate of more than 90%;Adding radical scaven-ger experiments shown that the hydroxyl radicals is not the only function groups,there are other active groups?·O₂^-,holes,etc.?involved in the reaction.3)Degradation kinetics studied that photocatalytic degradation kinetics consistent with quasi-first-order kinetics;Intermediate product mainly included,4-hydroxy-4-methyl-2-pentanone,acetic acid,benzoic acid and so on,the intermediate product of the first produced subsequently be degraded and eventually degrade to H₂O,CO₂,nitrate and other small mole-cules,nitrate loss from benzene and eventually degrade,reducing the harm to the enviro n-ment.