Unary and binary adsorption studies of lead and malachite green onto a nanomagnetic copper ferrite/drumstick pod biomass composite

Identification of malachite green in industrial wastewater using lignocellulose biomass composite bio-sorbent and UPLC-MS/MS: a green environmental approach

“…Indeed, when additional extractions were performed by adding 0.1% formic acid to each extraction solvent, then MG was not recovered, probably due to the ionisation of the tertiary amine which may have decreased the interaction with the bio-sorbent and caused its elution during the washing step with water. Previous work by the authors suggested possible electrostatic interaction between hydroxyl groups of the bio-sorbent and the quaternary amines in the dye; and between carbonyl groups of the bio-sorbent and the tertiary amine in the MG [30].…”

“…Pagnanelli's research group had confirmed that these functionalities have a capability to bind with metals [37]. The adsorption of dyes onto moringa oleifera pods powder-CuFe2O4 composite may be attributed to Van der Waals interactions between the aromatic π system of the dye and lone pairs of electrons from the nitrogen groups in MG with the aromatic system of lignin and the metals in the in the composite, and also with OH groups from the composite [30].…”

“…Then, the powdered bio-sorbent was washed with ultrapure water until reaching neutral pH. The lignocellulosic biomass modified with CuFe2O4 was prepared by adopting a previous reported procedure [30]. Briefly, 1 g of moringa pods biomass powder was mixed with CuCl2 and FeCl3 (mass ratio 3:1) in 500 ml conical flask followed by the addition ultrapure water to make the suspension of 100 ml.…”

“…The development of a high-throughput method for the quantification of MG using UPLC, in combination with a greener extraction technique, is an advance in the analysis of MG with respect to previous methodology [30]. Different reversed phase columns (Acquity® UPLC BEH C8, C18,) were tested.…”

Insights into the competitive adsorption of pollutants on a mesoporous alumina–silica nano-sorbent synthesized from coal fly ash and a waste aluminium foil

“…The reusability of the adsorbent was checked by the regeneration of SiA-2 by desorbing Pb(II) and MG. SiA-2 was suspended in a dilute HCl solution (0.01 mol L À1 ) for 1 h to desorb Pb(II). 55 Then, SiA-2 particles were washed with distilled water. Then, the particles were suspended in a C 2 H 5 OH-water solution for 1 h to desorb MG. Thereaer, the adsorbent was washed again with distilled water and dried in a hot air oven at 383 K for 8 h.…”