Title:
METHOD FOR RECOVERING PHOSPHITE IONS IN WASTEWATER
Document Type and Number:
WIPO Patent Application WO/2023/216729
Kind Code:
A1
Abstract:
A method for recovering phosphite ions in wastewater, comprising preparation of modified magnesium iron hydrotalcite and adsorption of phosphite ions. The modified magnesium iron hydrotalcite is prepared by dissolving Mg2+ and Fe3+ in deionized water, then adding TiCl4, then adding NaOH to adjust a pH value to 11-12, carrying out hydrothermal treatment to obtain an intermediate, and carrying out high-temperature calcination in a nitrogen atmosphere to prepare TiO2 modified hydrotalcite. According to the TiO2 modified magnesium iron hydrotalcite prepared by the present invention, TiO2 is efficiently and uniformly distributed in a layered structure of magnesium iron hydrotalcite, the adsorption activity of the magnesium iron hydrotalcite is improved, the adsorption amount of phosphite ions reaches 157.4 mg/g, and the equilibrium adsorption time is merely 30 minutes; under the condition that a large quantity of interfering ions are present, the adsorption stability is excellent, and the adsorption performance is kept stable and does not descend in a cyclic use process.
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Inventors:
GUAN WEI (CN)
XIE ZHIGANG (CN)
YUAN LING (CN)
HUANG HAO (CN)
XIE ZHIGANG (CN)
YUAN LING (CN)
HUANG HAO (CN)
Application Number:
PCT/CN2023/083279
Publication Date:
November 16, 2023
Filing Date:
March 23, 2023
Export Citation:
Assignee:
UNIV CHONGQING ARTS & SCIENCES (CN)
International Classes:
B01J20/04; B01J20/02; B01J20/28; B01J20/30; C02F1/28; C02F101/10
Foreign References:
| JP2013132636A | 2013-07-08 | |||
| CN114887582A | 2022-08-12 | |||
| CN110028090A | 2019-07-19 | |||
| JP2015013283A | 2015-01-22 |
Other References:
DANHONG SHANG, WANG QI; ZHANG ZHISHENG: "Study on kinetic and thermodynamics for Mg/Fe layered double hydroxide adsorbing phosphate from aqueous solution", ENVIRONMENTAL POLLUTION & CONTROL, vol. 37, no. 4, 15 April 2015 (2015-04-15), pages 47 - 52, XP093106755
WEI XUEFENG, MIAO JUAN, LV ZHEN, WAN XIAOYANG, ZHANG NING, ZHANG RUICHANG, PENG SHUGE: "Phosphate Adsorption onto an Al-Ti Bimetal Oxide Composite in Neutral Aqueous Solution: Performance and Thermodynamics", APPLIED SCIENCES, vol. 12, no. 5, 23 February 2022 (2022-02-23), pages 2309, XP093106308, DOI: 10.3390/app12052309
WEI XUEFENG, MIAO JUAN, LV ZHEN, WAN XIAOYANG, ZHANG NING, ZHANG RUICHANG, PENG SHUGE: "Phosphate Adsorption onto an Al-Ti Bimetal Oxide Composite in Neutral Aqueous Solution: Performance and Thermodynamics", APPLIED SCIENCES, vol. 12, no. 5, 23 February 2022 (2022-02-23), pages 2309, XP093106308, DOI: 10.3390/app12052309
Attorney, Agent or Firm:
CHONGQING JINGZHIHUI INTELLECTUAL PROPERTY AGENCY (ORDINARY PARTNERSHIP) (CN)
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