Solid solution structure adsorbent, preparation method and application in separation of Cr (VI) contained in water body

Abstract

The invention provides a solid solution structure adsorbent which is composed of a titanium dioxide-based solid solution in which zirconium ions and nitrogen atoms are dissolved and a zirconium dioxide-based solid solution in which titanium ions and nitrogen atoms are dissolved. The preparation method of the solid solution structure adsorbent comprises the following steps: (1) taking a powdery titanium source, a zirconium source, molten salt and a nitrogen source as raw materials according to a molar ratio of the titanium source to the zirconium source to the molten salt to the nitrogen source of 1: (0.05-0.2): (0.5-3): (3-8), and uniformly mixing the metered raw materials to form a mixture; (2) putting the mixture into a calcining furnace, heating to 400-800 DEG C under normal pressure, carrying out heat preservation calcining for 1-5 hours, and then cooling to room temperature along with the furnace to obtain a crude product containing molten salt; and (3) washing the crude product with deionized water to remove the molten salt, and then drying the purified material without the molten salt. The solid solution structure adsorbent has excellent selective adsorption performance on Cr (VI) in the water body, and can be applied to separation of Cr (VI) in the water body.

Description

technical field [0001] The invention belongs to the technical field of adsorbents, and particularly relates to an adsorbent for separating Cr(VI) ions in water bodies and a preparation method thereof. Background technique [0002] The Cr(Ⅵ) ions in the water body will cause great harm to human health and environmental protection, and must meet the national standards before being discharged or used. Cr(VI) mainly exists in slag leaching solution, rolling wastewater and electroplating wastewater and other water bodies, and forms complex mixed water bodies with other elements such as Cu, Ni, V, etc. For the removal of low-concentration Cr(VI) in the water body that has not yet reached the standard, it is difficult for a single process to meet the treatment requirements. [0003] Adsorption method is a method to remove Cr(VI) in water. This method removes Cr(VI) ions by adsorption and enrichment with adsorbents. The operation is simple and will not cause secondary pollution. H...

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Problems solved by technology

Although experiments have shown that the adsorbent PET@LDH nanofiber membrane has good chromium removal effect, is easy to separate, and is not easy to cause secondary pollution, but because its preparation method consists of electrospinning and hydrothermal methods, PET can be obtained by electrospinning for 6 hours. Nanofiber membrane, and then through 8h of hydrothermal treatment to load hydrotalcite LDH on the nanofiber membrane, so not only electrospinning equipment is required, but also a pressure vessel is required, and the preparation process is relatively complicated and energy consumption is high, resulting in the prepared adsorption Low cost performance of PET@LDH nanofiber membrane

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