Biosorption of Pd(II) from Aqueous Solution using Leaves of Moringa oleifera as a Low-cost Biosorbent

Abstract

Palladium ion (Pd(II)) is one of the hazardous metal pollutants commonly found in industrial effluents and poses severe environmental and human health impacts. The present study has chosen the leaves of Moringa oleifera (L-MO) as a potential biosorbent for removing Pd(II) from the aqueous solution. Various parameters such as pH, biosorbent dose, and initial Pd(II) concentration were optimized for maximum removal of Pd(II) using standard protocols. The Fourier-transform infrared spectroscopy study was performed to identify the functional groups involved in Pd(II) biosorption mechanism. The analysis of FTIR spectra confirmed the involvement of functional groups such as C–O, C=O, C–H, and O–H in the biosorption of Pd(II) on the surface of L-MO. The biosorption of Pd(II) was highest at pH 6. The sorption equilibrium data were well-fitted with the Langmuir isotherm model (R2 = 0.9896). The highest adsorption capacity of L-MO was 41.15 mg/g. It is concluded that the L-MO could be used as a potentially low-cost novel biosorbent to remove Pd(II) from contaminated water.

Advancing Green Nanotechnology: Harnessing the Bio-reducing Properties of Musa paradisiaca Peel Extract for Sustainable Synthesis of Iron Oxide Nanoparticles

“…Furthermore, the appearance of absorption peaks in the range of 1535.7-1401.5 cm -1 indicates the presence of carbonyl groups (C=O) associated with organic compounds present in the extract. These organic compounds, such as polysaccharides and proteins, may have participated in the formation and stabilization of the iron oxide nanoparticles [36]- [38]. The FTIR analysis also revealed the presence of absorption bands in the fingerprint region, which provided information about the specific bonds and functional groups in the nanoparticles.…”

“…Figure 2 illustrates the FTIR spectrum of the iron oxide nanoparticles synthesized utilizing M. paradisiaca peel extract. The FTIR spectrum of the iron oxide nanoparticles revealed characteristic absorption peaks that correspond to specific vibrational modes of various functional groups [36]- [38]. For example, the presence of broad absorption bands of 3220.4 cm -1 can be attributed to the stretching vibrations of hydroxyl groups (-OH) present in phenolic compounds and flavonoids within the M. paradisiaca peel extract.…”

“…The FTIR analysis also revealed the presence of absorption bands in the fingerprint region, which provided information about the specific bonds and functional groups in the nanoparticles. These bands can be attributed to vibrations of metal-oxygen (M-O) bonds, characteristic of iron oxide nanoparticles [36]- [38].…”

Influence of Water Table and Peat Thickness on Dissolved Organic Carbon of Tropical Peat Soil with Sulfidic Substratum from Central Kalimantan, Indonesia

“…Ecologically and geochemically, DOC plays a role in influencing acidity, nutrient availability, and metal mobility of ecosystems in the peatlands' downstream area [15]. The results showed that hydrological conditions were one of the main factors affecting the production and loss of organic carbon through water flow in peat soils [16] - [20]. However, only a few studies have been conducted on tropical peatlands [21]- [27].…”