Preparation, Characterization And Treatment DNT Wastewater Of Titanium Dioxide With Special Morphology

Combining the template method with the sol-gel method, titanium dioxide with special morphology was prepared by using Ti(OBu)₄ as the precursor and leaves and filter paper as the templates. The obtained titanium dioxide was reticular like the pinnate vein leaf, and composed of interwoven microstrips like filter paper, respectively. Further, using the titanium dioxide paper as the substance, PPY/TiO₂ composites with the paper-like morphology was synthesized via the static in-situ polymerization using the pyrrole as monomer. And by controlling the different reaction time, the different coating contents can be controlled. To easily separate TiO₂ from the treated water and enhance the photocatalysis, the filter paper template and nano-SrFe₁₂O₁₉ as a magnetic core were successful applied to prepare the magnetic titania paper composed of interwoven microfibers. The responding photocatalytic equipment has been designed and applied to treat the wastewater contaminated by powder and explosives. The available literatures about the above researches were scary, and these mothods have interestig attraction for a number of applications, in particular the preparation of the photocatalysts.In this paper, various treatment menthods were applied to treat the DNT wastewater which has great toxicity, high concentration and bad degradation. After DNT wastewater was pre-treated by acidification at the pH value of 1.2, the degradation rate of COD was 50%. Then under the nitrogen atmosphere, DNT wastewater was treated by the ferrous-carbon inner-electrolysis with the pH of 1-2. The zero-Fe reduction couldn't effectively decrease the value of COD, but could transform NO₂^- into, which was helpful to decrease the toxicity and activate the benzene ring because NH₂^- is active group. The introduction of Fe²⁺ was necessary for advanced oxidation reaction of Fe²⁺/H₂O₂/TiO₂/UV. The optimal parameters of pH,H₂O₂:Fe²⁺;,reaction time, and charging method of H₂O₂ were 2.5, 4:1, 2 h, and multiple-low-dose, respectively. Finally, after flocculation of 30 minute with the pH of 10, DNT wastewater reached the biological standard.