Published June 2019 | Version v1
Journal article Metadata-only

The effects of interaction between vermiculite and manganese dioxide on the environmental geochemical process of thallium

Creators

  • 1. The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR (China)
  • 2. School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR (China)
  • 3. Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR (China)
  • 4. Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR (China)

Description

Highlights: • The interaction between vermiculite and manganese dioxide forms a production, labeled VER-MnO2. • The VER acted as template substrate contributed higher BET and degree of oxidation of MnO2. • VER-MnO2 showed the highest fixation capacity (144.29 mg·g−1) without risk of Mn dissolution. • VER-MnO2 affect migration and transformation of Tl(I) by adsorption, ion exchange, oxidizability. • High breakthrough volumes indicated VER-MnO2 can prevent groundwater Tl pollution by catching it. -- Abstract: The interaction among various soil minerals can significantly impact on the environmental geochemical process of contaminants. Therefore, this study investigated the effects of interaction between vermiculite (VER) and manganese dioxide (MnO2) on the migration and transformation of Tl(I). The VER exhibited typical layered structure and MnO2 possessed a flower-like structure with serious reunion phenomenon, while the production of interaction between vermiculite and manganese dioxide, labeled VER-MnO2, illustrated as fish scales evenly spread over a large sheet, suggesting that MnO2 could triumphantly be anchored on the VER and the aggregation of MnO2 was prevented. Compared with the pure MnO2, VER acted as template substrate contributed the higher specific surface area (298.18 m2·g−1) and the oxidation degree of Mn. VER-MnO2 showed the highest fixation capacity (144.29 mg·g−1) than other two materials in the order VER-MnO2 > MnO2 > VER, and there was no risk derived from Mn dissolution. The influence mechanism of VER-MnO2 on Tl(I) migration and transformation lied in immobilization, ion exchange and oxidization. Fixed-bed column immobilization experiments showed that VER-MnO2 could purify drinking water contaminated by Tl (20 μg·L−1) and the effective breakthrough volumes were 900 bed volumes until reaching the maximum limits allowed in drinking water (0.1 μg·L−1). VER-MnO2 excellently catches Tl to prevent groundwater pollution. This study provides a theoretical guidance for environmental fate and restoration of soil heavy metal pollution.

Additional details

Identifiers

DOI
10.1016/j.scitotenv.2019.03.079;
PII
S0048969719310617;

Publishing Information

Journal Title
Science of the Total Environment
Journal Volume
669
Journal Page Range
p. 903-910
ISSN
0048-9697
CODEN
STENDL

INIS

Country of Publication
Netherlands
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
55065378
Subject category
S54: ENVIRONMENTAL SCIENCES;
Descriptors DEI
DISSOLUTION; DRINKING WATER; FISH SCALES; FLOWERS; GEOCHEMISTRY; GROUND WATER; HEAVY METALS; ION EXCHANGE; MANGANESE OXIDES; OXIDATION; PACKED BEDS; SOILS; SPECIFIC SURFACE AREA; SUBSTRATES; THALLIUM; VERMICULITE; WATER POLLUTION
Descriptors DEC
CHALCOGENIDES; CHEMICAL REACTIONS; CHEMISTRY; ELEMENTS; HYDROGEN COMPOUNDS; INORGANIC ION EXCHANGERS; ION EXCHANGE MATERIALS; MANGANESE COMPOUNDS; MATERIALS; METALS; MICA; MINERALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; POLLUTION; SILICATE MINERALS; TRANSITION ELEMENT COMPOUNDS; WATER

Optional Information

Copyright
Copyright (c) 2019 Elsevier B.V. All rights reserved.