Selective Cesium Adsorptive Removal on Using Crosslinked Tea Leaves

Abstract

To remove the radioactive cesium from the polluted environment, tea leaves were chosen as cheap, and abundantly available environment-friendly bio-adsorbents to investigate the alkali metals adsorption. Fresh and used tea leaves (FT and UT) were found to have high efficiency and selectivity for cesium adsorption, after the crosslinking with concentrated sulfuric acid. Calculation of the proton-exchanged amount suggested adsorption mechanism of three alkali metals on crosslinked tea leaves involve a cationic exchange with a proton from the hydroxyl groups of the crosslinked tea leaves, as well as coordination with ethereal oxygen atoms to form the chelation. Further, considering the practical application of the polluted water treatment, the competitive adsorption of Cs+ and Na+ ions was investigated by the batch-wise method and column chromatography separation. Unlike the conventional ion exchange and chelate resins with less selectivity for Cs+ coexisting cations, both crosslinked fresh tea leaves (CFT) and crosslinked used tea leaves (CUT) exhibited Cs selectivity over Na. In addition, batch adsorption studies revealed that the cesium adsorptions were driven by the Langmuir isotherm model; the capacity of both crosslinked tea leaves for cesium adsorption was determined to be around 2.5 mmol g−1. The adsorption capacities are sufficiently higher in comparison with those of synthetic polymers, inorganic ion-exchangers, and other bio-adsorbents.

Synthesis of Nano-Magnetite from Industrial Mill Chips for the Application of Boron Removal: Characterization and Adsorption Efficacy

“…The prepared sample was inserted into the cell holder of the UV-Vis spectrophotometer (DR/4000u) at the wavelength of 620 nm. The adsorption capacity q e (mg/g) and removal efficiency Re (%) of boron were determined from Equations (4) and (5), respectively [ 51 , 52 ]. where is the equilibrium boron concentration (mg/g), Co and C F are the initial and equilibrium concentrations of boron in the sample (mg/L), respectively, M is the adsorbent mass (g), and V (L) is the volume of the boron solution.…”

“…The prepared sample was inserted into the cell holder of the UV-Vis spectrophotometer (DR/4000u) at the wavelength of 620 nm. The adsorption capacity q e (mg/g) and removal efficiency Re (%) of boron were determined from Equations ( 4) and ( 5), respectively [51,52].…”

Petroleum Hydrocarbon Removal from Wastewaters: A Review

“…Sorbents, materials, or mixtures of insoluble materials are used to recover fluids during adsorption, physical attachment, or both [66][67][68][69][70][71][72][73][74][75][76]. Adsorbents must be absorbent of oil compounds and also waterproof [77].…”

Analysis of Natural Materials’ Adsorption Efficiency Relating Co(II) Using Atomic Absorption Spectroscopy: Laboratory Experiment

“…A mechanism of metal cation adsorption on adsorbents is found and described in more detail in various sources. , The process of ion adsorption can be either physical (physisorption), chemical (chemisorption), or combined. During physical adsorption, metal ions are caught on an adsorbent surface, i.e., on its nanopore network.…”