Synthesis, characterization, and regeneration of an inorganic–organic nanocomposite (ZnO@biomass) and its application in the capture of cationic dye

Abstract

Despite the efficiency of ZnO nanoparticle (NPs) composite adsorbents in the adsorption of various pollutants, there is presently no report on the combo of Znonps with biomass for adsorption. Besides, there is a dearth of information on the biosorption of celestine blue (ceB), a dye used in the nuclear and textile industry. in this study, biogenic-chemically mediated synthesis of a composite (Zno@Acp) was prepared by the impregnation of Znonps onto Ananas comosus waste (Acp) for the adsorption of ceB. the SeM, eDX, ftiR, XRD, Bet, and tGA characterizations showed the successful presence of Znonps on the biomass to form a nanocomposite. the uptake of ceB was enhanced by the incorporation of ZnONPs on ACP. A faster CEB adsorption onto ZnO@ACP (120 min) compared to ACP (160 min) was observed. The Langmuir (R 2 > 0.9898) and pseudo-second-order (R 2 > 0.9518) models were most appropriate in the description of the adsorption process. the impregnation of Znonps onto the biomass enhanced the spontaneity of the process and displayed endothermic characteristics. High CEB desorption of 81.3% from the dye loaded ZnO@ACP as well as efficient reusability showed the efficacy of the prepared nanocomposite for CEB adsorption. The pollution of environmental water from industrial effluents contaminated with industrial by-products is on the rise. This is attributed to the rapid growth of industries, hence the increase in industrial activities across the globe. About 700,000 tons of over 100,000 commercial dyes are produced annually in industries, which makes dye the most common water pollutant 1. Most dyes are used in the textile and paper industries and are frequently encountered in the effluents subsequently released into the environment 2,3. These dyes present in the environmental waters can be carcinogenic, mutagenic, and result in chronic illnesses in humans and aquatic organisms 3,4. Apart from that, they reflect or absorb light entering the water thus hindering the photosynthetic activity of aquatic plants 1. Therefore, the removal of dyes from wastewater is necessary to abate their harmful effects on the ecosystem 5,6. Most dye removal studies have focused on the removal of dyes such as methylene blue, congo red, malachite green, rhodamine B, methyl orange, methyl violet, reactive black, basic blue, acid yellow, brilliant green, and crystal violet 7,8. However, research on the removal of celestine blue (CEB) is rare despite the wide use of CEB in the nuclear and textile industries. Therefore, the removal of CEB from wastewater is important. Several techniques have been harnessed for the remediation of dye-polluted water, such as filtration, coagulation, oxidation, precipitation, reduction, photocatalytic degradation, solvent extraction, and adsorption 9. The adsorption technique is the most efficient and adsorption on bio-waste (biosorption) is promising due to the simplicity, low cost, degradability, reusability, and efficiency 10. Hence, the use of several bio-waste for the biosorption of dyes has received much attention,...

One-pot synthesis of zinc oxide nanoparticles via chemical precipitation for bromophenol blue adsorption and the antifungal activity against filamentous fungi

“…A simple one-pot synthesis via chemical precipitation was utilized for the preparation of ZnONPs 47 . Herein, 4.0 g of zinc acetate was added to 100 mL of distilled water in a beaker.…”

One-Pot Synthesis of Zinc Oxide Nanoparticle for Bromophenol Blue Adsorption and Its Antifungal Activity Against Filamentous Fungi

“…Such increasing randomness is well documented in the adsorption of dyes onto ZnONP based adsorbents 46,[87][88][89] .…”

“…After the adsorption of dye, the BRB-loaded ZnONP showed shifts in absorption bands from 3369 to 3377 cm -1 and 1380 to 1330 cm -1 for OH, from 2008 to 2033 cm -1 for the O=C=O, and from 550 to 557 cm -1 for the Zn-O functionalities. This indicated the involvement of the OH and Zn-O groups in the uptake of BRB on the adsorbent and that the mechanism of BRB uptake on ZnONP could be attributed to electrostatic interactions, H-bonding as well as weak Vander Waals interaction 46 .…”

“…A simple one-pot synthesis via chemical reduction was utilized for the preparation of ZnONP 46 . Herein, 4.0 g of zinc acetate was added to 100 mL of distilled water in a beaker.…”

“…The thermal stability of the synthesized ZnONP was evaluated from the TGA as presented in The nitrogen adsorption-desorption isotherm (Fig. 1e) of the ZnONP as obtained from BET analysis revealed a surface area of 9.259 m 2 /g and correlated with type III isotherm according to the IUPAC classi cation 46 . Also, the pore characteristics ( Fig.…”