Study Of Preparation Of TiO₂/sepiolite And Treating Of Dyeing Waste Water

The pringting and dyeing is one of the industry that heavily contaminates the environment. Because the traditional method of treating waste water have localization, which impels us to look after a new approach to deal with the water. As a newly technology to treat water, photocatalysis has much predominance, the technology is becoming one of the most effective means to dispose printing and dyeing liquid waste. But the catalyst is reclaimed difficultly and the loss of alive component is rather great, so it is hardly for it to become one of applied technic to treat water. In this paper, TiO₂/ sepiolite is prepared by way of powder sintering, and TiO₂ and sepiolite act as the material. X-ray analysis and the experiment show that the catalyst has both well adsorption and favorable photocatalysis character. It is one catalyst that is economical and has good capability.(1)In this paper, the author studied the adsorption and photocatalysis of methylene blue by TiO₂/ sepiolite. The adsorption experiment showed that TiO₂/ sepiolite is one fine adsorbent. Sepiolite loaded by TiO₂ has fine photocatalysis effect to methylene blue. The experiment testified that the photocatalysis decomposing effect is better under such congdition that the quantity of TiO₂ is 0.02g and pH is 7. At the same time, the lower of dye original concentration, the smaller of the liquid depth, the longer of the photocatalysis time, the stronger of the light, the better of photocatalysis effect. Theexperiment proves that TiOz/ sepiolite is both a kind of good adsorbent and good photocatalyst.(2) In addition, during the photocatalysis, if extra oxidation such as H202 is appended, the photocatalysis of TiO2/ sepiolite is greatly improved and the decomposing effect can be greatly enhanced. The decomposing result to methylene blue by way of photocatalysis oxidation is good, in which TiO-:/ sepiolite and sun' s rays is lamp-house. If the technic can be applied to practice, we can greatly economize cost. It can be a kind of clean and high effect technology of water treating. At the same time, TiO2/ sepiolite also has preferable catalysis effect to actual printing and dyeing waste water and dyeing waste. The decolor rate and decomposing rate of COD all can reach above 80%.(3) The photocatalyst TKV sepiolite can be reclaimed and repeated using after one photocatalysis. And the photocatalyst can keep good photocatalysis character. The catalyzing capability of being calcined is better than one that is not being calcined by the provement of the experiment.(4) The bee line which composed by the data come from the experiment has good pertinence which sepiolite as adsorbent. The process of decomposing to methylene blue by photocatalyst TiO2/ sepiolite accords with dynamics model Langmuir-Hinshelwood equation. The experiment proved that the decomposing of methylene blue exhibited one-grade reaction under low concentration and zero-grade reaction under high concentration. The dynamic equation is to be — ? 23.221*— + 0.5194( R=0.9979 ) . The half life t,/2 of metnylene blue solution photocatalysis is augmenting along with the increasing of the concentration, which is accord with the result of the experiment decomposingThe innovation rest with, Fist, adsorption experiment is carried out to methylene blue by loaded sepiolite. We reviewed the correspondingadsorption kinetics rule and the constant, and contrast with else type of sepiolite. Second, photocatalysis experiment is carried out to decompose methylene blue solution by TiO2/ sepiolite, and the effect of decolor rate by all factor so as to ascertain the best reaction condition. Third, dynamic model of photocatalysis to methylene blue solution by TiO2/ sepiolite is saw about and the dynamic data are abtained. Forth, reclaiming and repeated use of photocatalyst TiO2/ sepiolite is studied and the feasibility of its exertion in practice projection is also studied.