Activated Coconut Charcoal as a super adsorbent for the removal of organophosphorous pesticide monocrotophos from water

Tapping the potential of a glucosamine polysaccharide-diatomaceous earth hybrid adsorbent in the solid phase extraction of a persistent organic pollutant and toxic pesticide 4,4′-DDT from water

“…The K eq is defined as the ratio of [DDT] adsorbent surface /[DDT] solution at varying temperature. The thermodynamics is described through the Van't Hoff equation 52 that yields the other associated variables from the graphical correlation of ln K against 1/ T ( Fig. 8 ).…”

“…Imposing thermodynamic equilibrium conditions, the reaction Gibbs energy, DG r ¼ 0 and DG r o ¼ ÀRT ln K eq . The K eq is dened as the ratio of [DDT] adsorbent 52 that yields the other associated variables from the graphical correlation of ln K against 1/T (Fig. 8).…”

Prospective application of diethylaminoethyl cellulose (DEAE-cellulose) with a high adsorption capacity toward the detoxification of 2,4-dichlorophenoxyacetic acid (2,4-D) from water

“…Subsequently, the adsorption capacity of DEAE-cellulose for 2,4-D was tested on the real runoff water samples brought from a farm canal (Location: Guntur District, India). 38 An appropriate amount of runoff water (∼20 litres) was transferred to glass bottles and brought to the research laboratory and preserved at ambient temperature. The pH of the collected water sample was 6.9 with an appreciably high total hardness of above 1000 mg L −1 .…”

“…8) of ln K eq against 1/T can be used to acquire the other extensive variables namely, enthalpy and entropy (slope and intercept) associated with the adsorption of 2,4-D onto the DEAE-cellulose. 38 The adsorption of 2,4-D is spontaneous (with negative free energy change) and accompanied by lesser randomness (À79.674 J mol À1 K À1 ) on the DEAE-cellulose surface. The exothermic adsorption of 2,4-D (À30.763 kJ mol À1 ) and a large negative entropy make the process more favourable with the release of heat in the process of adsorption 39,40 (Table 2).…”

Coconut Shell Charcoal Combination with Teakwood Sawdust (CSC-TS): An Effective Low-Cost Adsorbent for the Removal Cr(VI) Ion on Industrial Waste

“…This result has the same line with earlier studies that langmuir model is more fit for coconut shell charcoal adsorption, such as the studies by [34] use coconut waste adsorbent to remove Pb(II) show that the adsorptive uptake of Pb(II) by the adsorbents follows Langmuir isotherm and pseudo-second order kinetic model which indicates the process follows favourable monolayer adsorption process governed by chemical adsorption, then [35] reinforce with using coconut shell adsorbent for removing on two pharmaceutical substances: amoxicillin and diclofenac sodium, show that the experimental adsorption data followed the Langmuir isotherm and the pseudo first-order kinetic model, furthermore [36] also state that coconut charcoal adsorbent showed good ability to remove monocrotophos from water at pH 7.0 with a high Langmuir adsorption capacity of 103.9 mg.g -1 . Langmuir model also fit in adsorbent with material like teakwood sawdust, the study from [18] show a maximum adsorption capacity of teakwood sawdust around 72.46 mg.g −1 and followed the Langmuir isotherm model.…”