Active mixed metal oxide loading silver modifying iron-based metallic oxide arsenic removal micro-nano adsorbent and preparation method thereof

Abstract

The invention belongs to the technical field of nanometer materials, particularly relates to active mixed metal oxide loading silver modifying iron-based metallic oxide arsenic removal micro-nano adsorbent and a preparation method thereof. Mixed metallic salt solution is prepared from iron-based metal salt solution, silver salt solution, zinc salt solution and zircon salt solution; hydrothermal reaction is carried out; after the reaction and natural cooling, under the circumstance of magnetic stirring, precipitator solution is dropped in the mixed metallic salt solution until the pH value of the mixed metallic salt solution is eight; after the dropping is finished, high speed centrifugation is carried out to obtain precipitate; washing and centrifugal separation are carried out again untilthe pH value of supernatant liquid of the mixed metallic salt solution is neutral; finally, drying roasting treatment are carried out to obtain the arsenic removal adsorption materials. The adsorbenthas the pore structure characteristics that the pore is larger than the superficial area, and mesoporous and macropore are 'mixed', the adsorbent has the advantages that the removal rate is high, theadsorption capacity is high, the use amount is less, the adsorption rate is quick and the secondary pollution can not occur. The adsorbent can be applied to the deep treatment of low concentration arsenic pollution in underground water and surface water and industrial wastewater containing low-concentration arsenic.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a multi-element metal oxide composite micro-nano material for absorbing and removing arsenic in water and a preparation method thereof, in particular to an active zinc-zirconium composite oxide micron-scale carrier loaded with silver to modify iron-based metal oxidation Nanoparticle adsorption material and its preparation method. Background technique [0002] Zero-valent iron and its oxides and hydroxides have a strong selective coordination effect on arsenate anions, but their fine particles and large specific surface area are prone to agglomeration and are difficult to be directly applied in practice. The main solution is to load or compound them to porous supports with large specific surface area. At present, the main carriers used are: activated carbon, quartz sand, mesoporous silica, diatomite, fly ash, montmorillonite, sepiolite, zeolite, halloysite, acti...

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Problems solved by technology

The loaded iron-containing arsenic-removing adsorption material prepared by the above-mentioned porous carrier and loading method has the following disadvantages: (1) There are many equipment or devices used in the iron element loading or carrier synthesis process, and the preparation process is complicated and lengthy. , such as the invention patent "Preparation of Adsorbent for Arsenic Removal by Iron-Carrier Activated Carbon" (Patent No. 200510110226.8); (2) The dispersant, activator, crosslinking agent or washing solution used involves a variety of dangerous and toxic organic substances, and the process is not Environmental protection, will cause secondary pollution, such as the invention patent application "Chitosan-iron oxide composite adsorption arsenic removal material preparation method" (application number CN200910017271.7); (3) The firmness of the load is not enough, and the release of iron ions is easy Cause secondary pollution, such as the invention patent application "A polystyrene-based magnetic nano-ferric oxide arsenic removal composite material and its preparation method" (application number CN201310732393.0); (4) in natural minerals or industrial waste carriers Residual impurities will cause secondary pollution, such as the invention patent application "Preparation method of halloysite-loaded needle-shaped ferric oxide nanocomposite material" (application number 201710536197.4)

However, there are few literature reports on the preparation and application of the above-mentioned multi-element metal oxide composite / loaded iron-based metal oxide micro-nano adsorption material for arsenic removal.

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