Biosorption of acid brown 14 dye to mandarin-CO-TETA derived from mandarin peels

Abstract

Several agronomic waste-materials are presently being widely used as bio-adsorbents for the treatment of toxic wastes such as dyes and heavy metals from industrial activities, which has resulted in critical global environmental issues. Therefore, there is a need to continue searching for more effective means of mitigating these industrial effluents. Synthetic aromatic dyes such as Acid Brown (AB14) dye are one such industrial effluent that is causing a serious global issue owing to the huge amount of these unsafe effluents released into the ecosystem daily as contaminants. Consequently, their confiscation from the environment is critical. Hence, in this study, Mandarin-CO-TETA (MCT) derived from mandarin peels was utilized for the removal of AB14 dyes. The synthesized biosorbent was subsequently characterized employing FTIR, TGA, BET, and SEM coupled with an EDX. The biosorption of this dye was observed to be pH-dependent, with the optimum removal of this dye being noticed at pH 1.5 and was ascribed to the electrostatic interaction between the positively charged sites on the biosorbent and the anionic AB14 dye. The biosorption process of AB14 dye was ideally described by employing the pseudo-second-order (PSO) and the Langmuir (LNR) models. The ideal biosorption capacity was calculated to be 416.67 mg/g and the biosorption process was indicative of monolayer sorption of AB14 dye to MCT biosorbent. Thus, the studied biosorbent can be employed as a low-cost activated biomass-based biosorbent for the treatment of AB14 dyes from industrial activities before they are further released into the environment, thus mitigating environmental contamination.

Copper(II) ion removal by chemically and physically modified sawdust biochar

“…At low conc of Cu(II) ions, decreased removal with increasing initial conc was ascribed to the elevated driving force in terms of biosorbents binding sites accessible and available, whereas the increased struggle for limited sorptions sites at elevated conc led to reduced removal of Cu(II) ions and thus more Cu(II) ions are left unabsorbed in the solutions due to the rapid saturations of sorptions sites. These assertions reported in this study are also supported by the study of Gupta et al[22], Larous and Meniai[64], Eldeeb et al[67], Yu et al[71], and Râpă et al[72].…”

“…Figure 7 shows the increase in the percentage of Cu(II) ions confiscated to SD, SSD, and SDA biochars as the contact time of the interactions between the sorbate and biochars was increased from 0 to 180 min, with equilibrium being attained at 60 and 120 min for SD and SSD and SDA biochars. The rapid biosorption process followed by the subsequent equilibrium trend attained was attributed to the available accessible vacant sites at the initial stage of the biosorption process leading to momentous biosorption rate and the saturations or occupations of accessible vacant sites as the treatment time was enhanced, thereby resulting in reduced biosorption rate [22,67].…”

Adsorption of Cr6+ ion using activated Pisum sativum peels-triethylenetetramine

“…Globally, environmental obliteration issues are presently instigating pollution and impairing natural resources owing to the massive upsurge in the human population and the Environment Division, National Institute of Oceanography and Fisheries (NIOF), Kayet Bey, Elanfoushy, Alexandria, Egypt evolution of industrial activities (El Nemr 2011, 2012aIbrahima et al 2021;Kerry et al 2021). Continuous progress in scientific and technological advancement is also a contributing factor, and this is now a serious threat to humanity (Eldeeb et al 2022;Aigbe et al 2022;Onyancha et al 2022).…”

Adsorption of methylene blue (MB) dye on ozone, purified and sonicated sawdust biochars

“…The global dye market is currently valued at over 32 billion US dollars (USD) and is expected to reach 42 billion USD in 2021 [31]. Synthetic dyes are produced in excess of 7.00 × 10 5 tons per year, with approximately 15.00% of these synthetic dyes being released into water bodies (aquatic environments) [32]. These dyes are carcinogenic, toxic, and xenobiotic and they are divided into solvent, reactive, basic, vat, and direct dyes based on their chromophore structure.…”