Antibacterial Films of Alginate-CoNi-Coated Cellulose Paper Stabilized Co NPs for Dyes and Nitrophenol Degradation

Abstract

The development of a solid substrate for the support and stabilization of zero-valent metal nanoparticles (NPs) is the heart of the catalyst system. In the current embodiment, we have prepared solid support comprise of alginate-coated cellulose filter paper (Alg/FP) for the synthesis and stabilization of Co nanoparticles (NPs) named as Alg/FP@Co NPs. Furthermore, Alginate polymer was blended with 1 and 2 weight percent of CoNi NPs to make Alg-CoNi1/FP and Alg-CoNi2/FP, respectively. All these stabilizing matrixes were used as dip-catalyst for the degradation of azo dyes and reduction of 4-nitrophenol (4NP). The effect of initial dye concentration, amount of NaBH4, and catalyst dosage was assessed for the degradation of Congo red (CR) dye by using Alg-CoNi2/FP@Co NPs. Results indicated that the highest kapp value (3.63 × 10−1 min−1) was exhibited by Alg-CoNi2/FP@Co NPs and lowest by Alg/FP@Co NPs against the discoloration of CR dye. Furthermore, it was concluded that Alg-CoNi2/FP@Co NPs exhibited strong catalyst activity against CR, and methyl orange dye (MO) degradation as well as 4NP reduction. Antibacterial activity of the prepared composites was also investigated and the highest l activity was shown by Alg-CoNi2/FP@Co NPs, which inhibit 2.5 cm zone of bacteria compared to other catalysts.

Transformation of a Polyoxometalate Precursor into Carbon Doped Bismuth Molybdate Nanosheets for the Visible Light Photocatalytic Degradation of Aqueous Pollutants

“…The zoomed-in UV spectra of MG degradation in the range 220–340 nm (see Figure S8, ESI) obtained using C-BMO as the photocatalyst showed an increase in the absorbance at 252 nm after photocatalysis. This new absorbance increase may be due to the smaller byproducts formed during MG degradation, as reported earlier . To calculate the rate constant of degradation of MG dye in different photocatalytic experiments, the pseudo-first-order kinetic equation – ln( C t / C 0 ) = kt was used, where k , C t , and C 0 are the rate constant of photocatalytic reaction, the absorbance of MG dye at a time t , and absorbance after adsorption–desorption (A–D) equilibria, respectively.…”

“…This new absorbance increase may be due to the smaller byproducts formed during MG degradation, as reported earlier. 56 To calculate the rate constant of degradation of MG dye in different photocatalytic experiments, the pseudo-first-order kinetic equation −ln(C t /C 0 ) = kt was used, where k, C t , and C 0 are the rate constant of photocatalytic reaction, the absorbance of MG dye at a time t, and absorbance after adsorption− desorption (A−D) equilibria, respectively. The order of the rate constant values obtained in min −1 for different photocatalytic and control experiments was C-BMO (0.0052) > U-BMO (0.0008) > no catalyst (0.0003) > dark conditions with C-BMO catalyst (0.0001) min −1 .…”

Optimization of methyl orange decolorization by bismuth(0)-doped hydroxyapatite/reduced graphene oxide composite using RSM-CCD

“…Moreover, the MO and BH 4 − ions on the surface of Bi/HAp-rGO were adsorbed, based on the Langmuir–Hinshelwood process. This is a reversible process that creates competition between both MO and BH 4 − for the active sites of Bi/HAp-rGO (Anwar et al 2021 ). For this reason, it can be stated that a high concentration of MO may reduce the yield by slowing down the reaction rate.…”

Carboxymethyl Cellulose/Copper Oxide–Titanium Oxide Based Nanocatalyst Beads for the Reduction of Organic and Inorganic Pollutants

“…Polymeric host materials are an attractive route to control the pore space and surface of the nanomaterials as well as their excellent properties, which could improve the mechanical strength for long-term use. Several polymers, including cellulose or carboxymethyl cellulose [ 13 , 24 , 25 , 26 , 27 , 28 ], chitosan, agarose, clay, alginate and so on [ 21 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ], are used. Among them, CMC has been proven to be an appropriate polymer host for various metal oxide nanocomposites.…”