期刊
出版社
MDPI
DOI: 10.3390/ijerph17072223
关键词
cadmium; composite modification; nanomaterial; sepiolite; adsorption
资金
- National Natural Science Foundation of China [41973078]
- Ministry of Education in China Project of Humanities and Social Science [2019JJ40081]
The pollution of Cadmium (Cd) species in natural water has attracted more and more attention due to its high cumulative toxicity. In the search for improved removal of cadmium from contaminated water, we characterized uptake on a recently identified nanomaterial (SiO2-Mg(OH)(2)) obtained by subjecting sepiolite to acid-base modification. The structural characteristics of SiO2-Mg(OH)(2) were analyzed by means of SEM-EDS, Fourier Transform Infra-Red Spectroscopy (FTIR) and Powder X-ray Diffraction (PXRD). Static adsorption experiments were carried out to evaluate the effect of contact time, temperature, amount of adsorbent, and pH-value on the adsorption of Cd(II) by SiO2-Mg(OH)(2). The results show that the pore structure of SiO2-Mg(OH)(2) is well developed, with specific surface area, pore size and pore volume increased by 60.09%, 16.76%, and 43.59%, respectively, compared to natural sepiolite. After modification, the sepiolite substrate adsorbs Cd(II) following pseudo-second-order kinetics and a Langmuir surface adsorption model, suggesting both chemical and physical adsorption. At 298 K, the maximum saturated adsorption capacity fitted by Sips model of SiO2-Mg(OH)(2) regarding Cd(II) is 121.23 mg/g. The results show that SiO2-Mg(OH)(2) nanocomposite has efficient adsorption performance, which is expected to be a remediation agent for heavy metal cadmium polluted wastewater.
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