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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
A novel phosphate rock-magnetic biochar for Pb2+ and Cd2+ removal in wastewater: Characterization, performance and mechanisms
Environmental technology & innovation, Vol.32, 103268
11/2023
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Abstract
The purification of industrial wastewater contaminated by lead (Pb) and cadmium (Cd) has become a global hot research topic at present. In this study, a novel phosphate rock-magnetic biochar (PR-MCLB) was prepared from phosphate rock (PR) and cow litter, and its removal efficiency and adsorption mechanisms for Pb2+ and Cd2+ in aqueous solution were explored. PR-MCLB maximum theoretical adsorption capacities (Qe,cal) of 451.24 and 120.87 mg g−1 at 25 ◦C for Pb2+ and Cd2+, respectively, which were approximately 1.5–42.4 and 1.1–21.0 times higher than the Qe,cal of phosphorusmodified or cow litter-derived biochar, respectively, as mentioned in previous studies. Acid conditions (pH 3.5–5.5) and coexisting cations (Ca2+, Zn2+, Mg2+ (10–200 mgL−−1)) have almost no adverse effect on the performance of PR-MCLB. Mechanistic analysis showed that phosphate and carbonate on PR-MCLB played a crucial role in immobilization, with 54.03% of Pb2+ and 39.12% of Cd2+ being immobilized through mineral precipitate formation. A total of 21.24% of Pb2+ and 32.22% of Cd2+ were deposited on the PR-MCLB surface by ion exchange. This is followed by the cation-π interactions and surface complexation, contributing 9.11% and 11.10% for Pb2+ and 7.36% and 18.71% for Cd2+, respectively. These results indicated that PR-MCLB, as a efficient and environmentally friendly material, exhibits immense potential for application in the remediation of wastewater contaminated with Pb2+ and Cd2+.
Details
- Title
- A novel phosphate rock-magnetic biochar for Pb2+ and Cd2+ removal in wastewater: Characterization, performance and mechanisms
- Creators
- Yonglin Chen - Guizhou UniversityWenjian Mao - Guizhou UniversityWentao Yang - Guizhou UniversityNabeel Khan Niazi - University of Agriculture FaisalabadBing Wang - Guizhou UniversityPan Wu - Guizhou University
- Publication Details
- Environmental technology & innovation, Vol.32, 103268
- Publisher
- Elsevier B.V
- Grant note
- Science and Technology Foundation of Guizhou Province (nos. QKHJC[2020]1Y181 and QKHZ[2022]222) National Natural Science Foundation of China (no. 32101391).
- Identifiers
- 991013131479902368
- Copyright
- © 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article