Optimizing the Biosorption Behavior of Ludwigia stolonifera in the Removal of Lead and Chromium Metal Ions from Synthetic Wastewater

Abstract

In this study, a natural low-coast, efficient, and eco- bio-sorbent plant material (Ludwigia stolonifera), with both parts of the root and shoot, were studied for the removal of the cationic metal ions, lead Pb2+ and chromium Cr6+, via batch mode experiments to evaluate their maximum adsorption capacity, and held a comparison between the used bio-sorbent roots and shoots, based on the highest bio-sorption potential. Optimization of the bio-sorption parameters, such as contact time, pH, bio-sorbent (root and shoot) dosage, and initial ion concentration was conducted. The results indicated that 1.6 g of the used bio-sorbent shoot material removed 81.4% of Pb2+, and 77% of Cr6+ metal ions from liquid media under the conditions of 100 ppm of initial metal ions concentration at room temperature for 60 min of contact time with the static condition. Different isotherms and kinetic models were fit to the experimental data to understand the nature of the bio-sorption process. The experimental data were best fit by the pseudo-second-order kinetic model with a high correlation coefficient (R2 = 0.999), which reveals the chemisorption nature of the bio-sorption process. The chemical and structural analysis of the used bio-sorbent, before and after Cr6+ and Pb2+ bio-sorption, were performed using different techniques of characterization, such as Scanning Electron Microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). The used bio-sorbent proved to be a low-cost, efficient, and eco-friendly material to remove heavy metal ions from aqueous solutions.

Assessment of the Heavy Metals Pollution and Ecological Risk in Sediments of Mediterranean Sea Drain Estuaries in Egypt and Phytoremediation Potential of Two Emergent Plants

“…The symptoms of heavy metal poisoning differ according to the type of metal that causes toxicity, and the duration of symptoms also differs depending on the amount of metal an individual is exposed to [16,17]. Toxicity of environmental pollutants is major problem for ecological evolutionary, nutritional, and environmental balance [18,19].…”

Removal of Lead by Merlinoite Prepared from Sugarcane Bagasse Ash and Kaolin: Synthesis, Isotherm, Kinetic, and Thermodynamic Studies

“…Furthermore, apart from these two models, other adsorption models were also used to fit the raw data regarding Pb adsorption [40][41][42][43]. These models included the Redlich-Peterson isotherm, the Temkin isotherm, and the Dubinin-Radushkevich isotherm.…”

An evaluation of waste and well water quality for agriculture production around Erbil city, Iraq

“…Researchers must analyze the fluctuation of trace elements and content in the pair surface water and groundwater to reduce pollution and improve water quality. Trace elements, unlike organic contaminants, are non-biodegradable and aggregate in living being's; in addition, many ions of trace metals are poisonous or carcinogenic 7,9 . Heavy metal bioaccumulation in food chains and their toxicity as concentrations rise have hampered their separation and purification.…”