Phosphorus nitride adsorbent with high-efficiency selectivity and its applications in removing uranium pollution and extracting uranium from seawater

Patent metadata

Field	Value
Publication number	US-2023080965-A1
Application number	US-202217878068-A
Country	US
Kind code	A1
Filing date	Aug 1, 2022
Priority date	Sep 14, 2021
Publication date	Mar 16, 2023
Grant date	—

Abstract

The invention discloses a phosphorus nitride adsorbent with high-efficiency selectivity, and its application thereof. The phosphorus nitride adsorbent has a mutually cross-linked hollow tubular structure. The adsorbent can have an adsorption capacity of 435.58 mg·g −1 and 7.01 mg·g −1 for spiked seawater and natural seawater with a uranium concentration of 350 ppb, and the adsorbent has a long service life, and can still maintain 91.14% of the initial adsorption capacity after 5 cycles of adsorption and desorption. Taking into account the advantages of a short material preparation cycle, a wide range of raw material sources, a low cost, an excellent adsorption performance, and long service life, the adsorbent can be used in technical fields such as uranium-containing wastewater treatment, uranium ore resource recovery, uranium extraction from seawater and the like.

First claim

What is claimed is:

1 . A phosphorus nitride adsorbent, wherein the phosphorus nitride adsorbent has a mutually cross-linked hollow tubular structure.

2 . The phosphorus nitride adsorbent according to claim 1 , wherein a preparation method of the phosphorus nitride adsorbent specifically comprising:
(1) uniformly dispersing hexachlorocyclotriphosphazene and sodium amide in a solvent by means of ultrasound to obtain a mixture A; (2) placing the mixture A in a microwave reactor, with power adjusted to 400-600 W and temperature raised to 160-230° C., and allowing the mixture to react for 3-14 h to obtain a phosphorus nitride intermediate product; (3) placing the phosphorus nitride intermediate product cooled to room temperature in ethanol, followed by centrifugation and freeze-drying to obtain the phosphorus nitride adsorbent.

3 . The phosphorus nitride adsorbent according to claim 2 , wherein in the step (1), a mass ratio of hexachlorocyclotriphosphazene and sodium amide is 1:(0.4-1).

4 . The phosphorus nitride adsorbent according to claim 2 , wherein in the step (1), the solvent is one or more of ethanol, benzene and methanol.

5 . The phosphorus nitride adsorbent according to claim 2 , wherein in the step (1), ultrasonic dispersion time is 10-180 min.

6 . The phosphorus nitride adsorbent according to claim 2 , wherein in the step (3), a centrifugation rate is 12000 rad/min, and freeze-drying time is 10-24 h.

7 . An application of a phosphorus nitride adsorbent in treating uranium-containing wastewater, wherein the application comprises:
adjusting a ratio of volume of the uranium-containing wastewater to be treated to mass of the adsorbent to 50 mL:0.010 g, and adjusting a pH to 2-9, adsorption temperature to 25-45° C., adsorption time to 2-180 min, and an oscillation speed to 370 rad/min.

8 . The application according to claim 7 , wherein the adsorption time is 60 min, the pH is adjusted to 4.0, and the adsorption temperature is 25° C.

9 . The application according to claim 7 , wherein the pH is adjusted with a 0.5 mol/L hydrochloric acid solution and a 1 mol/L sodium hydroxide solution.

10 . An application of a phosphorus nitride adsorbent in extracting uranium from seawater, wherein the application comprises: adjusting a ratio of volume of the seawater to be treated to mass of the adsorbent to 50 L:0.01 g, adsorption temperature to 25-45° C., and adsorption time to 7-15 days, and controlling a flow rate of the seawater to 3.6 L/h.

Assignees

• Univ Dongguan Technology

Inventors

• Wang Gang
• Zhao Lin
• Wang Shiyong

Classifications

• B01J20/3085

  Chemical treatments not covered by groups B01J20/3007 - B01J20/3078 · CPC title

• G21F9/12

  by absorption; by adsorption; by ion-exchange · CPC title

• B01J20/02 Primary

  comprising inorganic material · CPC title

• B01J20/28023

  Fibres or filaments (fibres or filaments in the form of membranes B01J20/28038; B01J20/28007 takes precedence) · CPC title

• C01B21/097 Primary

  containing phosphorus atoms · CPC title