Chitosan modifications for adsorption of pollutants - A review.

Adsorption of copper ions onto chitosan/poly(vinyl alcohol) beads functionalized with poly(ethylene glycol).

A review on the synthesis of graft copolymers of chitosan and their potential applications.

Capture of iodide from wastewater by effective adsorptive membrane synthesized from MIL-125-NH2 and cross-linked chitosan

3D porous bioadsorbents based on chitosan/alginate/cellulose nanofibers as efficient and recyclable adsorbents of anionic dye.

Cross-linked chitosan microspheres: An efficient and eco-friendly adsorbent for iodide removal from waste water

The invention discloses a preparation method of an adsorbing material for removing anions in water and application of the adsorbing material, and belongs to the technical field of sewage purificationtreatment in environmental protection. A chitosan acetic acid solution is taken as a material, liquid paraffin is taken as an organic dispersion medium, glutaric dialdehyde is taken as a crosslinkingagent, and a crosslinking chitosan microsphere is obtained through an emulsion crosslinking method. A crosslinking chitosan microsphere adsorbing agent prepared by adopting the method has good adsorption performance and cyclic utilization performance to iodine ions. Furthermore, the adsorbing agent also can adsorb other halide ions and oxyacid radical-containing ions and has great adsorption capacity. The adsorbing material prepared by the preparation method disclosed by the invention provides a new technical reference for removing anions in wastewater and has good recovery and cyclic utilization effects. The raw materials required for the adsorbing material are natural, nontoxic, universal and easily available, and the adsorbing material is low in price, simple in preparation process, high in treatment efficiency, short in treatment period and convenient for regenerated treatment and is an effective adsorbing agent for treating anions in wastewater.

Preparation method of adsorbing material for removing anions in water and application of adsorbing material

The invention belongs to the technical fields of development, preparation and application of phosphorus adsorbents for hyperphosphatemia in organisms, and relates to a preparation method and application for a nano iron oxide/chitosan phosphorus binder. The preparation method comprises the following steps: hydrophobic modified nano iron oxide is used as an emulsifier, a chitosan solution is used asan aqueous phase, kerosene is used as an oil phase, and therefore an oil-in-water Pickering emulsion is prepared; the Pickering emulsion is dispersed into a paraffin solution containing Span-80, andtherefore an uniform and stable O/W/O emulsion is prepared; a glutaraldehyde solution is added into the O/W/O emulsion, reaction is performed, and the obtained solution is allowed to stand; a supernatant is filtered out, demulsification washing is performed repeatedly by using absolute ethanol and deionized water, and suction filtration is performed; and drying is performed, so that the nano ironoxide/chitosan phosphorus binder is obtained. The nano iron oxide/chitosan phosphorus binder provided by the invention can be applied to adsorption of phosphorus; and the phosphorus binder prepared bythe method has the characteristics of a large specific surface area, good adsorption performance, strong stability and no obvious toxic effects on a human body.

Preparation method and application for nano iron oxide/chitosan phosphorus binder

The invention belongs to the technical field of surface modification of materials, and provides a preparation method of nanometer iron oxide with a hydrophobically modified surface. The method comprises the following specific steps: adding nanometer iron oxide into an alcohol solvent, so as to prepare an alcohol pulp of the nanometer iron oxide; adding oleic acid into the alcohol pulp of the nanometer iron oxide, performing uniform mixing, performing a reaction for 1-4h at the temperature of 40-90 DEG C to obtain a suspension, and allowing the suspension to stand for half an hour; and filtering off a supernatant of the suspension, then performing washing by using absolute ethanol, performing vacuum filtration, performing drying for 4-8h, and performing crushing to obtain the nanometer ironoxide powder with the hydrophobically modified surface. The method provided by the invention uses anhydrous alcohol as a dispersant, the nanometer iron oxide can be better dispersed into an organic medium, and the dispersant is easy to recycle; and the system can improve the solubility of the modifier oleic acid, promotes the modification process, has more convenient operation and a high-efficiency process, and is green and environmentally friendly.

Preparation method of nanometer iron oxide with hydrophobically modified surface

The invention discloses preparation method and application of a chitosan/hydrophobic montmorillonite adsorption material for treating anions in wastewater, and belongs to the technical field of sewagepurification in environmental protection Chitosan/montmorillonite microspheres are prepared by an emulsion crosslinking process, with hydrophobic modified montmorillonite particles as an emulsion stabilizer, a chitosan acetic acid solution as an inner water phase, liquid paraffin as an organic dispersion medium and glutaraldehyde as a cross-linking agent The chitosan/montmorillonite microsphereadsorbent prepared by the method realizes good adsorption property and large adsorption capacity on anions in water, and the system after hydrophobic modification is easier to separate from water The invention provides new technical reference for the removal of anions in wastewater, and realizes a good recovering and recycling effect The required raw materials are natural and non-toxic and common and easily available with low price; the preparation technology is simple, the treatment efficiency is high, the period is short, the regeneration treatment is convenient, and the chitosan/hydrophobic montmorillonite adsorption material is an effective adsorbent for treatment of anions in wastewater

Zhang Wenjun

Papers

Cross-linked chitosan microspheres: An efficient and eco-friendly adsorbent for iodide removal from waste water

Preparation method of adsorbing material for removing anions in water and application of adsorbing material

Preparation method and application for nano iron oxide/chitosan phosphorus binder

Preparation method of nanometer iron oxide with hydrophobically modified surface

Preparation method and application of chitosan/hydrophobic montmorillonite adsorption material for treating anions in wastewater