Preparation Of Modified Composite Material TiO₂/PAC And Removal And Control On Photocatalvtic Of 2-Methylisoborneol In Water

Today, with the rapid development of social economy, industrial production arbitrary row misplacing serious, a direct result of drinking water quality deterioration, eutrophication outbreak consume dissolved oxygen in water, rotting plants release the unpleasant taste and odor compounds not only directly affect people’s quality of drinking water, and a direct threat to human health, causing frequent consumer complaints.2-methylisoborneol （2-MIB） as a typical odor compounds, commonly found in natural organic substances containing （NOM） of surface water.In this study, sol-gel method with tetrabutyl titanate as titanium source, the obtained titanium dioxide （TiO₂） sol powdered activated carbon and after pretreated （PAC） in full contact with magnetic stirring, to prepare a composite light The catalyst TiO₂/PAC and its X-ray diffraction （XRD）, scanning electron microscopy （SEM） and energy dispersive spectrometer combined with （EDS）, Fourier transform infrared imaging microscopic spectroscopy （FTIR characterization）. Comparison of TiO₂/PAC and PAC alone solution for a single 2-MIB removaling, as well as to discuss of researching on the adsorption isotherms and light degradation kinetics. Analog NOM （natural organic matter） water bodies and water to remove the real impact of 2-MIB effect of two materials, and based on the ideal adsorbed solution theory （IAST） introduced SEBC （simplification background） model to fit the experimental data analysis. Experimental results are as follows:XRD spectra showed that the prepared TiO₂/PAC with characteristic peaks mainly anatase TiO₂. Between 800 to 550 cm-1 absorption band, which is a Ti-O bond stretching vibration caused. PAC surface of the porous structure in the distribution of wealth, and C, O, Au and Si is an element PAC molecules are mainly present. EDX elemental analysis Ti content and the amount of computational experiment preparation close. With Freundlich model and Langmuir model fit the data results of its discovery Freundlich adsorption isotherm can better describe TiO₂/PAC, for 2-MIB of adsorption PAC.PAC light reaction can not be ignored, probably due to photolysis of H₂O produce a strong oxidizing power of OH·. Nano-TiO₂/PAC for 2-MIB has a high ability to degrade, 180min after the degradation rate of 97.8%, while the PAC only degraded 65.4%, indicating that the TiO₂ porous located PAC under UV irradiation increased the 2-MIB removal capacity. Compared with the pseudo-second-order kinetics, TiO₂/PAC light degradation are more in line with the pseudo-first order kinetics.A small amount of PAC Adsorption of TiO₂ load is not great. Dosing low concentrations NOM （HA, TA） simulation of water in order to achieve the OTC value, the required amount of dosage of two samples more than about twice the dosage of pure water. UV-Vis spectra of their light absorption and degradation of humic acid solution after （HA） and tannic acid （TA） residual cases were detected, two materials adsorption stage and NOM concentrations are reduced light degradation phase occurs. PAC while reducing the value of the adsorption stage is greater than TiO₂/PAC reduce the amount at this stage; however TiO₂/PAC after UV irradiation, the removal rate of PAC performance enhancements faster than under UV light.SEBC model can simulate the relationship between removal rate and dose can be well applied in light degradation phase. And light absorption stage or the reaction stage, the respective trends are approximate. And independent of the initial concentration of 2-MIB. Experimental study found that due to the river NOM complexity and diversity, adsorption and photodegradation removal has been significantly reduced, but this does not affect the experimental data fit SEBC model in the real river. SEBC fully demonstrated in practice, especially in the field of optical response is still practical.