Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 827, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.154329
Keywords
Nanoscale zero-valent iron; Mesoporous silica; Core-shell structure; Heavy metals; Stability
Categories
Funding
- National Key Research and Development Program of China [2019YFC1805202]
- National Natural Science Foundation of China (NSFC) [21976134, 21707104, 51878472]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRK21001, PCRRK21003]
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The core-shell structured nanoscale zero-valent iron encapsulated with mesoporous hydrated silica was prepared for efficient removal of heavy metals. The material exhibited high adsorption capacity for Pb(II), Cd (II), and As(V) at pH 5.0.
The application of nanomaterials for the removal of heavy metals has received a great deal of attention because of their high efficiencies in the environment. But it is difficult to remove multiple heavy metals simultaneously with high effi-ciency and stability. Herein, the core-shell structured nanoscale zero-valent iron (nZVI) encapsulated with mesoporous hydrated silica (nZVI@mSiO(2)) were prepared for efficient removal of heavy metals including Pb(II), Cd(II), and met-alloid As(V). The material prepared uniformly with a high surface area (147.7 m(2) g(-1)) has a nZVI core with the par-ticle size of 20-60 nm anda modified dendritic mesoporous shell of 19 nm. 0.15 g L-1 of the optimal material exhibited an extraordinary performance on removing Cd(II) and the maximum adsorption capacity for Pb(II), Cd (II), and As(V) reached 372.2 mg g(-1), 105.2 mg g(-1), and 115.2 mg g(-1) with a pH value at 5.0, respectively. The dis -solved iron during the reaction showed that the mesoporous silica (mSiO(2)) played an important role in enhancing the stability of nZVI. In addition, the competitive relationship between the coexistence of two heavy metals was discussed and it was found that the removal efficiency of the material for both was improved when Cd(II) and As(V) were removed synergistically.
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