Utilisation of waste from the production of millet derived local drink as adsorbent for phosphate removal from aqueous solution

Removal of Rhodamine B from aqueous solution using silica extracted from rice husk

“…Adsorption kinetics which helps in the understanding of the rate of adsorption and the rate-limiting step of the transport mechanism was analyzed using pseudofirst-order, pseudo-second-order and intraparticle diffusion kinetic models. Their linearized model equations are given in [18][19][20][21][22] and the obtained plots are given in Fig. 5 (pseudo-first-order Fig.…”

“…Adsorption isotherm provides information on the distribution of pollutant molecules between the solid and liquid phases and in the determination of adsorption capacity as well as the nature of adsorbate-adsorbent interactions. Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Temkin isotherm models whose linearized model equations are given in [18][19][20][21][22] were tested and the obtained plots are shown in Fig. 6 (Langmuir Fig.…”

One-, Two-, and Three-Parameter Isotherms, Kinetics, and Thermodynamic Evaluation of Co(II) Removal from Aqueous Solution Using Dead Neem Leaves

“…e contents of the flask which included Co(II) of desired concentration and given mass of DNL was stirred on a heating plate at different time intervals. e influence of contact time was studied at three initial Co(II) concentrations (10, 100, and 500 mg/L), pH (3)(4)(5)(6)(7)(8), DNL mass (0.05-0.4), and temperature (25-60°C). After predetermined intervals, the solution was filtered using Whatman filter paper No 1, and the equilibrium concentration of Co(II) remaining in solution determined using a UV/visible spectrophotometer (spectro 23RS, labo med.inc) at 400 nm (predetermined) by complexing with concentrated aqueous ammonia.…”

“…us, there is a need for a very simple technology that can be designed at low cost and applied even at very local level even with no electricity. Many studies have reported that adsorption is the most promising treatment technology because of its potential efficiency, ability to remove very low levels of pollutant, low energy consumption, high selectivity, easy operation, and ability to separate various chemical compounds [6,7]. However, the efficiency of adsorption is highly dependent on the solid adsorbent responsible for fixing the pollutant on its surface.…”

“…ere is particularly an increasing trend towards the use of waste biomass materials as adsorbents for heavy metal removal from water and wastewater because of their abundant availability and low cost, with relatively high fixed carbon, presence of porous structure, and high content in cellulose, lignin, hemicellulose, etc. with good functional groups that can bind heavy metals [7,13,14]. Researchers are showing growing interest on adsorbents from leaf-based materials (in raw or modified from) because they are cheap and available in all parts of the world in very large quantities with very little use [11].…”