“…Similar results to this were observed by Huo et al. [ 22 ] and Georgin et al. [ 14 ], in which acidic conditions were favorable in the adsorptive processes.…”
Section: Resultssupporting
confidence: 91%
“…Chitosan, a fishing residue obtained from shrimp shells, stands out among alternative materials used as unconventional adsorbents. Chitosan is mainly used to remove contaminants from industrial effluents, such as textile and alimentary dyes and toxic metals [ 2 , 3 , 7 , 22 , 23 , 24 , 25 , 26 ]. Its main characteristic is to have amine groups, which act as adsorption sites with polycationic nature, such as polyelectrolyte and chelating agent.…”
“…Similar results to this were observed by Huo et al. [ 22 ] and Georgin et al. [ 14 ], in which acidic conditions were favorable in the adsorptive processes.…”
Section: Resultssupporting
confidence: 91%
“…Chitosan, a fishing residue obtained from shrimp shells, stands out among alternative materials used as unconventional adsorbents. Chitosan is mainly used to remove contaminants from industrial effluents, such as textile and alimentary dyes and toxic metals [ 2 , 3 , 7 , 22 , 23 , 24 , 25 , 26 ]. Its main characteristic is to have amine groups, which act as adsorption sites with polycationic nature, such as polyelectrolyte and chelating agent.…”
“…The positively charged surface of the composite result in strong electrostatic interaction with the negatively charged functional groups of carbofuran. At elevated pH values, the protonated sites of the composite decreases which reduce the adsorption of carbofuran 45 . Figure 7 Effect on % adsorption of carbofuran and imidacloprid: pH ( A ); adsorbent dose ( B ); amount of adsorbate ( C ); shaking time ( D ); temperature effect ( E ) during the adsorption on composite surface.…”
Highly efficient adsorbent was prepared for the removal of carbofuran and imidacloprid pesticides from wastewater. The silica monolith anchored graphene oxide composite was synthesized by the modified Fischer esterification protocol. The composite showed improved adsorption capacity for the removal of pesticides from wastewater. Graphene oxide was synthesized using the modified Hummer’s method, while the silica monolith was prepared via sol–gel method. The composite was characterized via X-ray diffraction, Fourier transform infra-red, Brunauer Emmett and Teller (BET/BJH) analysis, zeta potential, and FESEM imaging. Different adsorption parameters such as pH, contact time, adsorbate and adsorbent concentration, and temperature were optimized for the adsorption of pesticides. The equilibrium and kinetic models were applied to the adsorption process of the pesticides. Qe of the composite as found to be 342.46 mg g−1 for imidacloprid and 37.15 mg g−1 for carbofuran. The adsorption process followed the pseudo 2nd order kinetic model for carbofuran (R2~0.9971) and imidacloprid (R2~0.9967). The Freundlich isotherm best fitted to the adsorption data of the pesticides with R2 value of 0.9956 for carbofuran and 0.95 for imidacloprid. The resultant adsorbent/composite material came out with very good results for the removal of pesticides.
“…SEM is also a method of choice to observe and measure the pores of CS composites and molecular organic framework (MOF) [ 130 , 175 ]. Energy-dispersive X-ray spectroscopy (EDX) can be used in addition of SEM to give supplementary chemical qualitative analysis [ 66 , 71 , 80 , 124 ]. TEM of CS-based systems is most of the time limited to NPs characterization, and its combination with DLS ensures a complete characterization of their dimensions.…”
Section: Characterization Of Cs-based Materialsmentioning
confidence: 99%
“…They are all extracted from the stress–strain curve obtained after a tensile test and can be finely tuned to match the requirements of specific applications. For example, cellulose nanofiber/CS (CNF/CS) films for dye absorption in water were designed to be tougher than CNF film but more brittle than CS ones in order to confer higher resistance to the water flow and better dyes separating ability [ 124 ]. Similarly, Hanafy et al produced a CS/TiO 2 NPs/Oleic acid film displaying the correct balance between elasticity (elongation at the break) and tensile strength [ 101 ] in order to properly accommodate to the various forces resulting from the patient’s mobility [ 178 ].…”
Section: Characterization Of Cs-based Materialsmentioning
Chitosan (CS) is a natural biopolymer that has gained great interest in many research fields due to its promising biocompatibility, biodegradability, and favorable mechanical properties. The versatility of this low-cost polymer allows for a variety of chemical modifications via covalent conjugation and non-covalent interactions, which are designed to further improve the properties of interest. This review aims at presenting the broad range of functionalization strategies reported over the last five years to reflect the state-of-the art of CS derivatization. We start by describing covalent modifications performed on the CS backbone, followed by non-covalent CS modifications involving small molecules, proteins, and metal adjuvants. An overview of CS-based systems involving both covalent and electrostatic modification patterns is then presented. Finally, a special focus will be given on the characterization techniques commonly used to qualify the composition and physical properties of CS derivatives.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
