Degradation of Congo Red Dye Using Homogeneous Photo Fenton Catalyst Coupled with Oxygen Kinetics and Statistical Analysis

Abstract

Experimental design DoE (box behnken design BBD) and statistical analysis approaches were employed to determine the effect of Congo red dye (C.R) concentration, photo catalyst dose (Fe+2) and follow of oxygen gas as an oxidant on the degradation of C.R. The results show that the concentration oppositely affects the degradation yield whereas the remaining two factors show positive effect, throughout all experiments oxygen molecule shows crucial role in their positive effect with p-value about 0.01 which is very significant value. The accepted regression model was linear with significance p-value 0.032 that mean all factors show good agreement in linear relationship and the interactions was not important. Degradation kinetics was also applied to investigate the effect of increasing dye concentration on degradation rate constant with and without photo catalyst dose and oxidant (O2). It appears that the degradation of peak at 498nm is second order The result was in good agreement with that of statistical analysis that are 0.0435, 0.0545 and 5.4 M- min- with photo catalysis 12, 8 and 4 PPM dye, 4O2 mL/min,20PPM Fe+2 respectively, in case without photocatalyst the results were 0.0025 and 0.0207 M- min-with 12 and 4 PPM in turn.

Silver-Loaded Carbon and Phosphorous Co-Doped Boron Nitride Quantum Dots (Ag@CP-BNQDs) for Efficient Organic Waste Removal: Theoretical and Experimental Investigations

“…For this reason, the log–log graphical approach, as well as integral and deferential rate laws, have been used. The validity of the kinetic order can also be assessed using the correlation coefficient ( R 2 ) obtained from fitting curves, especially when R 2 is close to unity. ,, It shows that the degradation of tetracycline 375 nm is the second order with a R 2 value of 0.99 as shown in Figure B.…”

“…As indicated in Table , the influence of initial concentration on the rate constant, the rate constant of waste removal does not remain constant when the initial concentration is changed. The reason behind this is due to secondary photochemical processes that occur during photocatalytic degradation and also a change caused by the quenching process due to excimer formation, in which some intermediates absorb light and re-emit it as heat without initiating semiconductor photocatalysts, resulting in photons not reaching the photocatalyst’s surface. ,,,, …”

“…The reason behind this is due to secondary photochemical processes that occur during photocatalytic degradation and also a change caused by the quenching process due to excimer formation, in which some intermediates absorb light and re-emit it as heat without initiating semiconductor photocatalysts, resulting in photons not reaching the photocatalyst’s surface. 4 , 5 , 67 , 74 , 75 …”

“…Aromatic structures of most drugs, pesticides, and dyes are highly hazardous, carcinogenic, and mutagenic. , Photocatalytic degradation is one the methods for solving this issue, in which the photocatalyst absorbs electromagnetic radiation greater than or equal to the semiconductor’s band gap and excites electrons from the valance band to the conduction band. Thus, creating holes in the valence band (h+) and electrons in the conduction band, and as a result, reactive oxygen species (ROS), primarily hydroxyl radicals ( • OH) and superoxide radical anions (O 2 •– ), are formed at valance and conduction bands, respectively. − …”

Kinetic Study of Congo-Red Photo-Catalytic Degradation in Aqueous Media Using Zinc Oxide as Photo Catalyst Under Led Light

“…The rate of Congo-red degradation has been estimated by examining degradation of each peaks of (498nm, 344nm) it appears that the degradation of peak 498nm is first order and 344nm is pseudo zero order. Through plotting log-log graphical method and the theoretical approach have been used in order to determine the order of CR degradation as in the following equations [17][18][19][20][21][22][23][24].…”