Porous oxide adsorbing material for efficiently removing harmful ions in water

An oxide and water removal technology, applied in the directions of alkali metal oxides/hydroxides, water pollutants, alkali metal compounds, etc., can solve the problems of insufficient adsorption performance, limited adsorption capacity, adsorption rate, etc.

Pending Publication Date: 2021-01-12
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitations of the synthesis methods, the disadvantage of the oxide adsorbents synthesized by these methods is that the adsorption performance is not superior enough. Most of the research content is limited to the adsorption capacity or adsorption rate, and rarely involves efficient trace adsorption.
At present, there is no oxide adsorbent that can adsorb trace amounts of harmful ions directly to drinking water standards

Method used

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  • Porous oxide adsorbing material for efficiently removing harmful ions in water
  • Porous oxide adsorbing material for efficiently removing harmful ions in water
  • Porous oxide adsorbing material for efficiently removing harmful ions in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] BaZrO with hollow spherical morphology was first prepared by hydrothermal method 3 Precursor, the reaction condition is Ba(OH) 2 , ZrOCl 2 ·8H 2 O, KOH and H 2 O is fully stirred according to the molar ratio of 1:1:10:100, placed in a hydrothermal device, and reacted at 150°C for 3 days to prepare hollow BaZrO 3 . Precursor hollow BaZrO 3 , hydrochloric acid and water were mixed according to the molar ratio of 1:10:100, placed in a high-pressure reaction vessel, first reacted at 100°C for one day, and then transferred to an oven at 150°C for 3 hours. After this step of reaction, all Ba is stripped out and transformed into the product ZrO 2 . The product was separated by centrifugation and washed with deionized water, and dried in an oven at 70 °C. This product retains the hollow spherical characteristics of the precursor, which is determined by figure 1 Visible, the precursor BaZrO 3 and product ZrO 2 They are all hollow spherical. figure 2 shows ZrO 2 Th...

Embodiment 2

[0042] Firstly, star-shaped BaZr was prepared by hydrothermal method x Ti 1-x o 3 (x=0.2-0.8) precursor, the reaction condition is that Ba(OH) 2 , ZrOCl 2 ·8H 2 O, TiCl 4 and H 2 O according to the molar ratio of 1:x:(1-x):100, (x=0.2-0.8) is fully stirred and placed in a hydrothermal device, and BaZr can be prepared by reacting at 120°C for 1 day x Ti 1-x o 3 . Precursor BaZr x Ti 1-x o 3 , hydrochloric acid and water were mixed according to the molar ratio of 1:12:100, placed in a high-pressure reaction vessel, first reacted at 110°C for one day, and then transferred to an oven at 140°C for 2 hours. After this step of reaction, Ba is all dissolved and converted into the product Zr x Ti 1-x o 2 (x=0.2-0.8). The product was separated by centrifugation and washed with deionized water, and dried in an oven at 70 °C. Product Zr x Ti 1-x o 2 (x=0.2-0.8) has the same star-shaped characteristics as the precursor, by Figure 5 confirmed by scanning electron micro...

Embodiment 3

[0044] BaZrO with truncated octahedral morphology was first prepared by hydrothermal method 3 Precursor, the reaction condition is Ba(OH) 2 , ZrOCl 2 ·8H 2 O and H 2 O is fully stirred according to the molar ratio of 1:1:100, placed in a hydrothermal device, and reacted at 130°C for 1 day to prepare truncated octahedral BaZrO 3 . The precursor BaZrO 3 , hydrochloric acid and water were mixed according to the molar ratio of 1:10:100, placed in a high-pressure reaction vessel, first reacted at 110°C for one day, and then transferred to an oven at 130°C for 3 hours. After this step of reaction, all Ba is dissolved and transformed into truncated octahedral ZrO 2 . The product was separated by centrifugation and washed with deionized water, and dried in an oven at 70 °C. The process and mechanism of the preparation reaction are consistent with Example 1. X-ray powder diffraction showed that the zirconium dioxide had an amorphous phase. The zirconium dioxide is used to pur...

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Abstract

The invention relates to a transition metal oxide material for water pollution treatment. The transition metal oxide material can remove harmful metal ions such as chromium (VI), arsenic (V), lead (I1), uranium (VI) and cadmium (I1) in water to reach the drinking water standard. Chromium (VI) and arsenic (V) can be adsorbed to 10 ppb or below, and lead (II), cadmium (II) and uranium (VI) can be adsorbed to 1 ppb or below. The general formula of the adsorbent is MxOy, wherein M is selected from one or two transition metal elements of Zr, Ti, Fe, Mn, Mo, W and the like; and 1 < = x < = 2 and 1 <= y < = 5. The material is prepared by adopting a micro-etching technology, and has the characteristics of rich pore structures, high-density hydroxyl, high specific surface area and the like throughaccurate selective etching, so that the adsorbent has strong adsorption capacity on harmful ions, and an efficient removal effect is achieved. In addition, the material has good cyclic utilization performance, the synthesis process is simple, the cost is low, and the material has a wide prospect in the aspect of water pollution treatment.

Description

technical field [0001] The invention belongs to the technical field of water pollution control materials, and in particular relates to a porous transition metal oxide with low crystallinity. [0002] technical background [0003] With the continuous increase of the world population and the continuous advancement of industrialization, the problem of water pollution has attracted widespread attention all over the world, especially the problem of drinking water contaminated by harmful metals and non-metal ions, which is widespread in all parts of the world and threatens human health. healthy. Chromium (VI), lead (II), arsenic (V), cadmium (II), uranium (VI) and other ions are common harmful elements in water, which come from wastes discharged from various industrial productions such as metallurgy, electroplating, power generation, etc. liquid. Its compounds cannot be degraded naturally or contain radioactivity, causing serious health problems in humans. The Ministry of Health...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F101/20C02F101/22C02F101/10
CPCB01J20/06B01J20/28004B01J20/28019B01J20/28042B01J20/28059B01J20/28061B01J20/30C02F1/281C02F2101/20C02F2101/22C02F2101/103C02F2101/006C02F2303/16
Inventor 黄富强农淑英董武杰
Owner PEKING UNIV
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