Abstract
Several approaches have been used to reduce the accumulation of heavy metals in aqueous solutions, including adsorption to the surface of agricultural waste. Batch studies have been performed in this study to explore the adsorption of Fe2+, Mn2+ on olive pomace (OP), and moringa seed husk (MSH). Fourier transform infrared and scanning electron microscopy also characterized the prepared adsorbent. Batch adsorption studies were performed, and the effects of adsorbent chemical structure, adsorbent dosage, pH, contact time, and initial ion concentration were investigated on Fe and Mn ions sorption and mechanism in order to maximize the removal efficiency of Fe and Mn. It was shown that the removal percentage of Fe2+ and Mn2+ were 83% and 91%, respectively, at optimum pH 5 and optimum time of 120 min at 5 g of OP. Although the removal percentage of Fe2+ and Mn2+ were 80.5% and 93%, respectively, at 5 g of MSH. The pseudo-second-order model was followed by the adsorption kinetics of Fe2+ and Mn2+ on OP and MSH, and the Langmuir model worked well with the adsorption isotherms. Based on their adsorption/desorption processes, OP and MSH adsorbents may be regenerated by DI water more than five times. The overall adsorption power of the OP adsorbent for Fe2+ and Mn2+ was 10.406 and 10.460 mg/g, and the MSH was 10.28 and 11.641 mg/g for Fe2+ and Mn2+, respectively.
Highlights
One of the main causes of water degradation of marine heavy metals is agricultural wastewater effluent
Moringa Oliefera Seeds Husks (MSH) have been used as an adsorbent to get rid of iron and manganese ions from the aqueous solution (Ghafar et al 2017), Moringa oleifera seed powder has been researched
The correlation coefficients (R2) for the pseudo-second-order kinetic model are higher than those for the pseudo-firstorder kinetic model, and the qe values calculated from the pseudo-second-order kinetic model are very close to the experimental ones. These results suggest that the overall rates of the adsorption of Fe2+, Mn2+ onto olive pomace (OP) and moringa seed husk (MSH) are controlled by chemical adsorption
Summary
One of the main causes of water degradation of marine heavy metals is agricultural wastewater effluent. Aqueous toxic waste induces heavy metal pollution from many operations, such as metal plating, logging, tanning, etc. There are, several distinct strategies for extracting heavy metals from polluted water (Ince and Ince 2017). A number of these olive oil wastes have recently been tested with positive findings as heavy metal biosorbents (Gharaibeh et al 1999; Martín-Lara et al 2008). Nieto et al (2010) examined the adsorption of Fe by olive stones in agricultural wastewaters. Moringa Oliefera Seeds Husks (MSH) have been used as an adsorbent to get rid of iron and manganese ions from the aqueous solution (Ghafar et al 2017), Moringa oleifera seed powder has been researched. Ongulu (2015) investigated Moringa oleifera seed powder with a view of using it as a low-cost
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