Chitosan immobilised granular FeOOH-MnxOy bimetal-oxides nanocomposite for the adsorptive removal of lead from water

Synthesis of Fe–Mn-Based Materials and Their Applications in Advanced Oxidation Processes for Wastewater Decontamination: A Review

“…Jyothi et al fabricated granular FeOOH-Mn x O y bimetallic oxide nanocomposites (FeMnG) by the soft chemical method using protonated chitosan as a carrier to form the gel into the desired shape by hand extrusion/hand molding (Figure 3c). 58 Especially, compared with the conventional high temperature/room temperature precipitation method, low-temperature precipitation was found to be more favorable for the formation of crystal nuclei and accelerate the nucleation and splitting of crystals, so as to prepare catalytic materials with high surface energy and specific surface area. Yang et al used low temperature (−10 °C) coprecipitation method to obtain highly dispersed Fe−Mn bimetallic oxides and found that Mn can be used as an effective electron donor for Fe, thereby enhancing the dissociation adsorption of CO. 61 The introduction of Fe into the internal structure of γ-MnO 2 can also change the morphology, crystal structure, and surface properties of the material.…”

“…Except for the above typical Fe–Mn bimetallic materials, other binary Fe–Mn-based materials (such as mesoporous bimetallic oxides and mixed metal oxides) and polymetallic Fe–Mn-based materials are also popularly used in various research fields. , The synthesis methods of mesoporous metal oxides are mainly the hard template method using mesoporous silica as a template and the template-free method. For example, Wen et al used KIT-6 as a hard template to synthesize magnetic mesoporous iron–manganese bimetallic oxides (MMIM) with high specific surface area, pore volume, and well-connected mesopores for arsenic removal .…”

“…For instance, nanocomposites can be modulated into particles of different shapes and sizes by means of granulation for recycling in water treatment. Jyothi et al fabricated granular FeOOH-Mn x O y bimetallic oxide nanocomposites (FeMnG) by the soft chemical method using protonated chitosan as a carrier to form the gel into the desired shape by hand extrusion/hand molding (Figure c) . Especially, compared with the conventional high temperature/room temperature precipitation method, low-temperature precipitation was found to be more favorable for the formation of crystal nuclei and accelerate the nucleation and splitting of crystals, so as to prepare catalytic materials with high surface energy and specific surface area.…”

Chitosan Based Materials in Cosmetic Applications: A Review

“…The form in which chitosan occurs is closely related to its use. Granules are often used as a biosorbent in water purification from heavy metals [ 7 , 8 ]. Regarding chitosan films or membranes, they are applied as active dressings, drug carriers [ 9 ], and more and more often as a base for cosmetic masks [ 10 ].…”