Title:
ENVIRONMENT-FRIENDLY REMEDIATION AGENT FOR CR(VI)-CONTAMINATED SOIL, AND PREPARATION METHOD THEREFOR AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2023/088292
Kind Code:
A1
Abstract:
Provided in the present invention are an environment-friendly remediation agent for Cr(VI)-contaminated soil and a preparation method therefor. The method comprises the following steps: dissolving chitosan in a mixed solvent formed by glacial acetic acid and methanol, then adding a pyrrole monomer and an oxidizing agent FeCl3 in sequence, enabling the pyrrole monomer to form polypyrrole that coats the surface of the chitosan, placing the prepared chitosan/polypyrrole mixed solution in a refrigerator for refrigeration overnight; and adding the chitosan/polypyrrole mixed solution to a precipitant prepared from absolute ethyl alcohol and ethyl acetate until a black flocculent substance is precipitated, and centrifugally washing and freeze-drying the black flocculent substance to obtain the remediation agent. The remediation agent can be conveniently used for the remediation of Cr(VI)-contaminated soil, has a spongy microstructure and developed porosity, can further play a role in reduction while adsorbing Cr(VI), does not affect the reusability of the soil after remediation is completed, and even can increase the fertility of the soil to promote the growth of plants.
Inventors:
YANG ZONGZHENG (CN)
DENG YING (CN)
LIU DAN (CN)
WU ZHIGUO (CN)
PANG RUNYI (CN)
WANG JINJIN (CN)
CAO JINGGUO (CN)
WU LIYA (CN)
WANG CHUNHU (CN)
DENG YING (CN)
LIU DAN (CN)
WU ZHIGUO (CN)
PANG RUNYI (CN)
WANG JINJIN (CN)
CAO JINGGUO (CN)
WU LIYA (CN)
WANG CHUNHU (CN)
Application Number:
PCT/CN2022/132215
Publication Date:
May 25, 2023
Filing Date:
November 16, 2022
Export Citation:
Assignee:
TIANJIN UNIV OF SCIENCE AND TECHNOLOGY (CN)
International Classes:
C09K17/32; C09K101/00
Foreign References:
| CN113930245A | 2022-01-14 | |||
| CN107141473A | 2017-09-08 | |||
| CN106750579A | 2017-05-31 | |||
| CN103757917A | 2014-04-30 | |||
| CN111014275A | 2020-04-17 | |||
| CN107715170A | 2018-02-23 |
Other References:
ZHANG, YUJIE ET AL.: "Study on the Adsorbing Performance of Polypyrrole/Chitosan Composite Electrode for Cu2+", ION EXCHANGE AND ADSORPTION, vol. 34, no. 04, 20 August 2018 (2018-08-20), ISSN: 1001-5493
ZHAO CHUNXIA, XUE JUANQIN, ZHANG YUJIE, DAI JIZHE: "Adsorption of metal ions on polypyrrole/chitosan composite electrode ", CHINESE JOURNAL OF ENVIRONMENTAL ENGINEERING, vol. 10, no. 11, 1 January 2016 (2016-01-01), pages 6392 - 6396, XP093067467, DOI: 10.12030/j.cjee.201603252
HUA CHAO, ZHANG RUNHU, BAI FANG, LU PING, LIANG XIANGFENG: "Removal of chromium (VI) from aqueous solutions using quaternized chitosan microspheres", CHINESE JOURNAL OF CHEMICAL ENGINEERING, CHEMICAL INDUSTRY PRESS, BEIJING, CN, vol. 25, no. 2, 1 February 2017 (2017-02-01), CN , pages 153 - 158, XP093067470, ISSN: 1004-9541, DOI: 10.1016/j.cjche.2016.08.024
KARTHIK RATHINAM ET AL.: "Removal of Hexavalent Chromium Ions from Aqueous Solution Using Chitosan/Polypyrrole Composite", DESALINATION AND WATER TREATMENT, vol. 56, no. 6, 22 August 2014 (2014-08-22), pages 1587 - 1600, XP009545706, ISSN: 1944-3994
ZHAO CHUNXIA, XUE JUANQIN, ZHANG YUJIE, DAI JIZHE: "Adsorption of metal ions on polypyrrole/chitosan composite electrode ", CHINESE JOURNAL OF ENVIRONMENTAL ENGINEERING, vol. 10, no. 11, 1 January 2016 (2016-01-01), pages 6392 - 6396, XP093067467, DOI: 10.12030/j.cjee.201603252
HUA CHAO, ZHANG RUNHU, BAI FANG, LU PING, LIANG XIANGFENG: "Removal of chromium (VI) from aqueous solutions using quaternized chitosan microspheres", CHINESE JOURNAL OF CHEMICAL ENGINEERING, CHEMICAL INDUSTRY PRESS, BEIJING, CN, vol. 25, no. 2, 1 February 2017 (2017-02-01), CN , pages 153 - 158, XP093067470, ISSN: 1004-9541, DOI: 10.1016/j.cjche.2016.08.024
KARTHIK RATHINAM ET AL.: "Removal of Hexavalent Chromium Ions from Aqueous Solution Using Chitosan/Polypyrrole Composite", DESALINATION AND WATER TREATMENT, vol. 56, no. 6, 22 August 2014 (2014-08-22), pages 1587 - 1600, XP009545706, ISSN: 1944-3994
Attorney, Agent or Firm:
BEIJING FINELAND IP FIRM (CN)
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