Abstract
Copper oxide-antimony oxide (Cu2O-Sb2O3) was prepared and entrapped inside Na-alginate hydrogel (Alg@Cu2O-Sb2O3). The developed Alg@Cu2O-Sb2O3 was used as catalytic reactor for the reduction of 4-nitrophenol (4-NP), 2-nitrophenol (2-NP), 2,6-dinitrophenol (2,6-DNP), methyl orange (MO), congo red (CR), acridine orange (AO), methylene blue (MB) and potassium ferricyanide (K3[Fe(CN)6]). Alg@Cu2O-Sb2O3 was found to be selective and more efficient for the reduction of 2-NP among all the pollutants. Therefore, 2-NP was selected for a detailed study to optimize various parameters, e.g., the catalyst amount, reducing agent concentration, 2-NP concentration and recyclability. Alg@Cu2O-Sb2O3 was found to be very stable and easily recyclable for the reduction of 2-NP. The Alg@Cu2O-Sb2O3 nanocatalyst reduced 2-NP in 1.0 min, having a rate constant of 3.8187 min−1.
Highlights
Environmental pollution achieved worrying levels due to the continuous release and disposal of numerous pollutants into the environment and wastewater. Many of these pollutants are dyes and nitrophenols and are unsustainable in nature, which is of great concern due to environmental regulations
Alg@Cu2 O-Sb2 O3 was initially tested for methyl orange (MO), congo red (CR), ArO, methylene blue (MB) and K3 [Fe(CN)6 ], 4-NP, 2-NP and 2,6-DNP, and we explored the efficiency of the Alg@Cu2 O-Sb2 O3 nanocatalyst for the reduction of these pollutants
Organic dyes are regarded as toxic pollutants, and the prepared Alg@Cu2 OSb2 O3 nanocatalyst was examined in order to evaluate the catalytic activity using NaBH4
Summary
Environmental pollution achieved worrying levels due to the continuous release and disposal of numerous pollutants into the environment and wastewater Many of these pollutants are dyes and nitrophenols and are unsustainable in nature, which is of great concern due to environmental regulations. Various techniques are utilized regarding the removal of lethal pollutants from contaminated water [7] These processes are believed to not be very useful for the complete removal of dangerous pollutants, or they require a long time. Doped metal oxides are efficient catalysts, but their utilization in powder form has several drawbacks such as aggregation, regeneration of the catalyst, recyclability and leaching To solve these problems, a Cu2 O-Sb2 O3 nanomaterial was wrapped inside Na-alginate hydrogel to prevent this agglomeration and to make the recycling of metal oxide nanocatalysts easy, which is the novelty of the current study. 2-NP, which underwent a reduction in 1.0 min, having a superior rate constant
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