Degradation of methylene blue by photolysis: effect of process variables
Abstract
In the present work it is reported how the different process variables affect the photolysis of Methylene Blue (MB), without the use of other agents, evaluating the source of radiation, the agitation speed, the pH and the temperature. The results obtained for pH 3 -7.28%, pH 7 16.95% and at pH 11 76.09%, these results are attributed to the hydroxyl group (OH) present in the solution. Similarly, a great dependence of photolysis is observed depending on the source of radiation and its power, obtaining as a result 62.30%, 18.65% and 8.84% for solar radiation, LED lamp and Xenon lamp, respectively. On the other hand, the increase in temperature does not show to be determinant, finding a maximum of - 8.74% when the solution is heated to 46°C and, finally, it was found that changes in agitation produce changes in the adsorption values, finding for 100 rpm 57.64%, 500 rpm 62.30% and 900 rpm 59.91%.
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