Adsorption of cysteine on metal(II) octacynaomolybdate(IV) at different pH values: Surface complexes characterization by FT-IR, SEM with EDXA, CHNS and Langmuir isotherm analysis

Efficacious Sorption Capacities for Pb(II) from Contaminated Water: A Comparative Study Using Biowaste and Its Activated Carbon as Potential Adsorbents

“…The hydrogen, oxygen, and nitrogen contents in EFSCAC also decrease from 5.688 to 3.450%, 44.368 to 18.584%, and 6.373 to 3.786%, respectively, compared to EFSC. The increase in the carbon content and decrease in the hydrogen, oxygen, and nitrogen contents in EFSCAC can be inferred from the release of volatile compounds from EFSC and leaving behind the carbonaceous compound …”

“…The increase in the carbon content and decrease in the hydrogen, oxygen, and nitrogen contents in EFSCAC can be inferred from the release of volatile compounds from EFSC and leaving behind the carbonaceous compound. 29 …”

“…The increase in the carbon content and decrease in the hydrogen, oxygen, and nitrogen contents in EFSCAC can be inferred from the release of volatile compounds from EFSC and leaving behind the carbonaceous compound. 29 The surface charges for EFSC and EFSCAC were analyzed by performing a zeta potential within a pH range from 2 to 9 where the surface charge for both the biosorbents was found to be positive for pH 2 and negative for the pH range of 3−9 (Figure S3). The negative zeta potential charge may be due to the availability of carboxylates and phenolic hydroxyl functional groups.…”

Comparative and Selective Interaction of Amino Acid d-Cysteine with Colloidal Gold Nanoparticles in the Presence of a Fluorescent Probe in Aqueous Medium

“…The citrate layer surrounding the Au NPs in aqueous dispersion gives an overall strong negative surface potential as is already confirmed by the ζ potential study (as shown in Figure S1b in the Supporting Information). It is already reported elsewhere that at neutral pH (7.0) cysteine is neutral, due to which there will be very less possibility of citrate caped Au NPs having direct interaction with d -Cys through its −NH 2 group via electrostatic attraction . However, due to the strong affinity of the −SH moiety of d -Cys towards the Au NPs’ surface, they try to encapsulate Au NPs by thiolate–Au bond formation via chemisorption, which eventually displaces the original citrate layer of Au NPs.…”

“…It is already reported elsewhere that at neutral pH (7.0) cysteine is Table 1. Binding Constant (K b ), Binding Sites (n), Gibbs Free Energy (ΔG), Stern−Volmer Constant (K SV ), and Quenching Rate Constant (K q ) for the Au NPs/RhB Mixed Aqueous Solution a neutral, 51 due to which there will be very less possibility of citrate caped Au NPs having direct interaction with D-Cys through its −NH 2 group via electrostatic attraction. 42 However, due to the strong affinity of the −SH moiety of D-Cys towards the Au NPs' surface, they try to encapsulate 41 Au NPs by thiolate−Au bond formation via chemisorption, 39 which eventually displaces the original citrate layer of Au NPs.…”