Degradation of Alizarin Yellow R using UV/H₂O₂ advanced oxidation process

Abstract

The homogeneous advanced oxidation process of ultraviolet (UV) radiation in presence of hydrogen peroxide (H 2 O 2 ) was utilized to degrade Alizarin Yellow R, one of the most commonly used azo dyes in the textile industry. In this study, the effects of initial H 2 O 2 concentration, initial dye concentration, initial pH, and temperature were examined to determine the optimum conditions for maximum degradation. Complete degradation was achieved within 1 h, for all the experimental conditions studied in the present work. The Box-Behnken response surface methodology (RSM) was used for optimizing the variables of the degradation process. Based on the estimated optimum conditions, 92.7% of degradation was achieved. The degradation process was found to follow first order kinetics. The estimated rate constants, along with the optimized conditions will be of useful for the design and scale up of the combined UV/H 2 O 2 process for the said purpose.

One pot green synthesis of Pt, Co and Pt@Co core‐shell nanoparticles using Sechium edule

“…The peak intensity was decreased in the case of NPs indicating a relatively lower concentration of bio‐molecules present on the NPs. The peak at 1135 cm −1 assigned to the carboxylate group was found to diminish in the NPs indicating the possible conjugation of the metal NPs with the bio‐molecules through the carboxylate group . It supports the theory that AA in bio‐extract plays a key role in reducing the metal ions for the formation of metallic NPs and, further, it could stabilize through conjugation with the NPs.…”

An investigation on the use of ultraviolet light emitting diodes (UV LEDs) in a plug‐flow reactor for water treatment

“…Very little difference in decolorization rate was observed for H 2 O 2 /methylene blue molar ratios between 500 and 700. Although the optimum value for the H 2 O 2 /methylene blue molar ratio may vary with the water pollutant and its concentration, reactor type and design, and UV source and intensity, the trend between reaction rate and H 2 O 2 /methylene blue molar ratio shown in Figure is supported by other published studies . Increasing the H 2 O 2 /methylene blue molar ratio initially increases the rate at which hydroxyl radicals are formed (Eq.…”

“…In this study, however, a simple pseudo‐first‐order rate equation was used to assess the experimental data acquired with a plug‐flow UV/LED reactor for the decolorization of methylene blue. This is supported by other published works, in which a pseudo‐first‐order rate equation was used to analyze experimental data for the degradation of various pollutants in UV/H 2 O 2 processes .…”

Future Perspectives of Biomass Torrefaction: Review of the Current State-Of-The-Art and Research Development

“…This is an important parameter to consider as high moisture content translates into energy loss when burning biomass [16]. Therefore, to increase energy efficiency and the quality of the final product, it is necessary to reduce its moisture content by reducing emissions during the thermo-chemical process of energy conversion [55].…”