Abstract:In this study, Trapa bispinosa's peel (TBP) biomass is exploited as an effective, low cost and new adsorbent to remove Pb(II) from aqueous solution. TBP is pretreated and modified with HNO3, HClO4 and H2O2 to enhance the Pb(II) removal and it is perceived that chemical modifications enhance the adsorption capacity of TBP. The adsorption behavior of Pb(II) is studied under different conditions, including pH (3-6), TBP dose (0.050.8 g), stirring speed (100-200 rpm), initial Pb(II) ion concentration (25-400 mg L-… Show more
“…Various extractants have been studied for the Pb(II) separation, including organic phosphonates, [12][13][14] carboxylic acid, 15,16 phosphinic acid, 17 and calix compounds. 18,19 Despite exhibiting a high separation efficiency for Pb(II), these extractants still face numerous challenges in practical applications, including toxicity after decomposition, high concentration of stripping, inadequate selectivity, the propensity to form emulsions or low capacity for extraction.…”
The extraction of lead-212 (212Pb) from radioactive thorium (Th) waste is immensely important, as it serves to mitigate environmental risks associated with radioactive waste and provides a vital source for...
“…Various extractants have been studied for the Pb(II) separation, including organic phosphonates, [12][13][14] carboxylic acid, 15,16 phosphinic acid, 17 and calix compounds. 18,19 Despite exhibiting a high separation efficiency for Pb(II), these extractants still face numerous challenges in practical applications, including toxicity after decomposition, high concentration of stripping, inadequate selectivity, the propensity to form emulsions or low capacity for extraction.…”
The extraction of lead-212 (212Pb) from radioactive thorium (Th) waste is immensely important, as it serves to mitigate environmental risks associated with radioactive waste and provides a vital source for...
Cellulose-based nanocomposite (FeCNB) has been synthesized via sol-gel conversion for adsorptive remediation of Congo red, a carcinogenic and mutagenic azo dye, from water. The bead was characterized by Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), energy dispersive X-ray analysis (EDAX) and transmission electron microscopy (TEM). The effect of adsorbent dose, pH, contact time, shaking speed, initial dye concentration and temperature was carried out in a batch adsorption study. The maximum removal of Congo red was found at pH 6.0, corresponding to the adsorbent dose of 1.0 gdm-3 and 90 min of contact time. The experimental data were analyzed using different isotherm and kinetic models. The data was fitted best to Langmuir isotherm model and pseudo-second-order kinetic model. The maximum adsorption capacity evaluated from Langmuir isotherm is 3.52 mgg-1 at 303 K. Thermodynamic study was carried out to evaluate the changes in Gibbs free energy (ΔG0 ), enthalpy (ΔH0 ) and entropy (ΔS0 ) of the dye-adsorbent interaction. The negative ΔG0 values at all temperatures suggested the spontaneous nature; the positive ΔH0 value indicated the endothermic nature and the positive ΔS0 indicated the increased randomness of the adsorption process. Desorption study found 0.1 (M) NaOH as the most suitable eluting agent for dye-loaded adsorbent. The adsorbent can be used up to five successive cycles of adsorption-desorption.
“…37,42,43 For example, Trapa bispinosa's peel biomass is used as an effective, low-cost, and new adsorbent to remove lead(II) from aqueous solutions. 44 Rice bran biomass were used to remove nickel. 45,46 Biomass from NaOH-pretreated Mangifera indica leaves was found to have the highest absorption capability.…”
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