In Situ Modification of Activated Carbon Made from Camellia oleifera Shell with Na2EDTA for Enhanced La3+ Recovery

Author:

Huang Lijinhong123,Zeng Xiangrong4,Fan Chunyan1,Liu Lihong1,Alam Shafiq3,Zeng Bin4,Liu Shaomin1ORCID,Huang Wanfu5,Shu Ronghua6

Affiliation:

1. WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Perth, WA 6845, Australia

2. School of Architecture and Design, Jiangxi University of Science and Technology, Ganzhou 341000, China

3. Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada

4. School of Rare Earth and New Materials Engineering, Gannan University of Science and Technology, Ganzhou 341000, China

5. School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

6. School of Emergency Management and Safety Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

Abstract

It is important to recover La3+ from metallurgical solutions or wastewater. However, the recovery rate of La3+ is usually less than 1% and the recovery methods are not environmentally friendly or user-friendly. Therefore, a straightforward, efficient, clean, and economically friendly method is needed. In this investigation, a modified adsorbent, COSAC-Na2EDTA-15, which was made from the Camellia oleifera shell (COS) and disodium ethylenediaminetetraacetic acid (Na2EDTA), was invented. In addition, characterization of the COSAC-Na2EDTA-15 adsorbent was conducted using SEM and XPS, and the principle of adsorption was revealed. The adsorption kinetics followed P-S-O KM, while the isotherm of COS-activated carbon (COSAC) aligned more closely with the Langmuir model. Compared to COSAC, the maximum La3+ adsorption capacity of COSAC-Na2EDTA-15 increased from 50 to 162.43 mg/g, and the content of O and N changed from 7.31% and 1.48% to 12.64% and 4.15%, respectively. The surface of the COSAC-Na2EDTA-15 exhibited abundant C, N, and O elements, and La3+ was detected on the sample surface after adsorption. The test and analysis results fully indicate that La3+ can be successfully adsorbed on the surface of COSAC-Na2EDTA-15. Because of its easy preparation, low cost, and superior performance, activated carbon made from COS finds extensive applications in the adsorption and recovery of rare earth elements.

Funder

National Natural Science Foundation of China

Publisher

MDPI AG

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