The Efficient Purification And Resource Conversion Of 4-FP Wastewater In Optical Fibers-Catalyst-Biofilm-Adsorbent Intimate Coupling System

The high stability and biological activity of organic fluorine extends its applications.meanwhile,the high bonds in carbon-fluorine bonds also causes the difficult degradation.As an example of fluorophenol,fluorophenol is an important chemical raw material,which is widely used in fine chemicals such as pharmaceutical,dye,liquid crystal,etc.,and will inevitably lead to leakage and residue during manufacturing and using.Eventually leads to environmental pollution,even destroys the ecosystem.In addition,the residual fluoride（F^-）in the water is inhaled by human body,which will cause huge damage to the human function organ.In order to solve the low degradation rate,low F^-removal rate and low resource conversion efficiency of 4-FP,this paper focused on the degradation and resource conversion of 4-FP wastewater,designed a novel optical fiber-photocatalyst-biofilm-adsorbent intimate coupling system.The main research contents are as follows:（1）The preparation high activity photocatalytic fiber and its performance in 4-FP wastewater degradation.In order to improve the photocatalytic degradation and difluoride efficiency of 4-FP,La/Ti O₂-CN.photocatalyst and La/Ti O₂-CN coated photocatalytic fiber was prepared.The spectral response range of photocatalyst and the photoelectric performance photocatalytic fiber was characterized by spectrometer and electrochemical workstation.The optimum ambient temperature and substrate solution initial p H during 4-FP degradation was selected.The experimental demonstrates that the photocatalyst reached500 nm on the absorption spectrum of visible light and the photocurrent reached 0.35μA/cm²,and the transmit spectrum of the photocatalytic fiber reached 500 nm as well.when the ambient temperature and initial p H was 35℃ and 7,the photocatalytic degradation,difluoride efficiency and COD degradation of 4-FP（Volume 200 m L,concentration 50 mg/L）in 20 hours reached 97.87%,78.89%,79.57%,respectively.（2）The study on the performance of degradation and conversion of 4-FP in biofilm system.The effects of temperature and p H on the performance of the 4-FP degradation showed that when the ambient temperature and initial p H was 35℃ and 8,the microalgae biofilm degradation,difluoride efficiency and COD degradation of 4-FP（Volume 200 m L,concentration 50 mg/L）in 24 hours reached 86.30%,57.39%and 61.61%,respectively.（3）The study on the performance of optical fiber-photocatalyst-biofilm intimate coupling system on the degradation and resource conversion of 4-FP wastewater.In order to study the performance of photochemical coupling system on the degradation and resource conversion of 4-FP wastewater,an optical fiber-photocatalyst-biofilm intimate coupling system reactor was constructed and used in the experimental of 4-FP degradation.The result demonstrated that when the ambient temperature and initial p H was 35℃ and 8,the microalgae biofilm degradation,difluoride efficiency and COD degradation of 4-FP（Volume 200 m L,concentration 50 mg/L）in 18 hours reached 100.00%,82.05%and 83.87%,respectively.After 20 cycles（1 cycle is 1 day）,the dry weight of the microalgae biofilm,the chlorophyll（a and b）content and the oil content reached 420.24 mg,16.64%,and 24.30%from 60.50 mg,17.56%and 15.01%,respectively.（4）The study on the adsorption properties of fluoride ion adsorbent for 4-FP and fluoride ion.In order to achieve selective adsorption of F^-in liquid phase,and improve the 4-FP degradation performance.The F^-selective adsorbent film was prepared by Zr O2nanoparticles and activated carbon,and the adsorption properties of F^-adsorbent on 4-FP and F^-were studied.The study showed that when p H increased from 6 to 9,the adsorption efficiency for 200 m L 0.44 m M 4-FP varied from 28.50%to 27.80%,and for 200 m L 0.44m M F^-（in Na F）maintained at 65.23%.（5）The study on the degradation and resource conversion of 4-FP in optical fiber-photocatalyst-biofilm-adsorbent intimate coupling system.In order to achieve the rapid degradation of 4-FP,removal of F^-,and continuous conversion to microalgae biomass,an optical fiber-photocatalyst-biofilm-absorbent intimate coupling system reactor was constructed and used for the experimental of 4-FP degradation and F^-removal.The result demonstrated that the ambient temperature and initial p H was 35℃ and 8,the degradation efficiency of 4-FP reached 100%and 97.86%in 16 hours and 14hours,less than optical fiber-photocatalyst-biofilm intimate coupling system 2 hours at least.After 20 cycles（1 cycle is 1 day）,the chlorophyll（a and b）content decreased 3.58%,dry weight of the microalgae biofilm and oil content reached 6.26 times and 1.64 times when compared to the initial value.Comprehensively,optical fiber-photocatalyst-biofilm-adsorbent intimate coupling system achieved rapid and continuous degradation and resource conversion（microalgae biomass）of 4-FP wastewater.