Production of efficient carbon fiber from different solid waste residuals for adsorption of hazardous metals from wastewater samples

Abstract

Uranium (as a hazardous and radioactive element) removal from wastewater requires reliable technology and proper functional materials. Carbon fiber species that are produced from agricultural solid waste can be a proper type of low-cost adsorbents for wide uses in wastewater treatment. In this work, two carbon fiber species labeled CF-RH and CF-SCB were synthesized from two different agricultural wastes, namely, rice husk and sugarcane bagasse respectively. The structural properties of carbon fiber were verified by XRD, FTIR, and Raman, spectroscopy. Both nitrogen-adsorption–desorption BET surface area and TEM were performed to figure out the textural characteristics of the presented sorbents. The charges on surfaces of the fibers were detected via zeta potential analysis. The prepared carbon fibers were applied for uranium removal from aqueous solution by adsorption technique. The acquired data display that the equilibrium time was 240 min. The results of adsorption process are nicely fitted with pseudo-second-order-kinetic and Langmuir isotherm models. The maximum sorption capacity was 21.0 and 29.0 mg/g for CF-RH and CF-SCB, respectively. Sorption thermodynamics declare that adsorption of U(VI) is an endothermic, spontaneous, and feasible process. The picked findings of this study could emphasize high reliability of the introduced adsorbents in efficient tackling of water contaminants.

Decoration of polystyrene with nanoparticles of cobalt hydroxide as new composites for the removal of Fe(iii) and methylene blue from industrial wastewater

“…This indicates the chemisorption nature for MB and Fe(III) sorption from wastewater, and the removal process involves electron sharing between the composite surface active sites and dye molecules and Fe(III) ions. [41][42][43] The same kinetic prole was reported for methylene blue and Fe(III) sorption from wastewater using iron-based metal organic frameworks, 8 hydroxyapatite sodium alginate, 20 and thiosemicarbazide-functionalized graphene oxide composites. 21 Moreover, Fe(III) removal from wastewater using chitosan, 15,18 silica-supported organic-inorganic hybrids, 16 and pecan shell-based activated carbon 19 was also obeyed to the pseudo-second-order kinetic model.…”

“…In this regard, pseudo-rst-order (Lagergren), pseudo-second-order, intra-particle diffusion (Weber-Morris), and Bangham's models were used for analyzing the adsorption results. The linear forms for the applied models are exhibited in eqn ( 5)-( 8) respectively as follows: [41][42][43]…”

“…The sorption process is controlled by a solo reaction mechanism if the plot exhibits a linear relationship passing through the origin; however, it is controlled with multiple mechanism if the plot consists of several segments. 42,43 Fig. 9-III declares that the MB and Fe(III) sorption processes are controlled with multi-reaction mechanisms, whereas the plot consists of two segments.…”

Conversion of corn shell as biomass solid waste into carbon species for efficient decontamination of wastewater via heavy metals adsorption

“…Biomass materials as the substrate of adsorbent composites have garnered a lot of interest in the field of environmental management, among other useful materials [21,22]. Because of their accessible availability and excellent adsorption capabilities, biomass-based carbon compounds, which may be generated from agricultural and forest products, have sparked widespread concern [21][22][23]. The recycle of natural waste to meet the goal of environmental conservation has been the subject of extensive investigation.…”

“…The recycle of natural waste to meet the goal of environmental conservation has been the subject of extensive investigation. Biochar made from forestry wastes has been found to provide potential marketing advantages for the adsorption process due to its low cost, eco-friendly, and natural availability [23].…”