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- Title
Adsorption separation in-situ synthesis of MIL-101(Cr)/AC composite and its cycling adsorption for Cr(VI) from aqueous solution.
- Authors
Zhuannian Liu; Yue Li; Yingying Teng
- Abstract
Cr(III) was adsorbed and separated by activated carbon (AC) from aqueous solution in order to recycle and reuse it, then MIL-101(Cr)/AC composite was in-situ synthesized by hydrothermal method based on AC adsorbed Cr(III). The structure and morphology of AC, MIL-101(Cr) and MIL-101(Cr)/AC composite were investigated by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, Brunauer-Emmett-Teller and zeta potential. The factors of time, temperature, pH and adsorbent dosage on Cr(VI) adsorption capacity and the reusability of the materials were studied. The results indicated that the specific surface area of AC, MIL-101(Cr) and MIL-101(Cr)/AC was 950.9, 1,687.1 and 655.9 m²·g-1, respectively. The adsorption capacity of MIL-101(Cr)/AC for Cr(VI) was 47.00 mg·g-1, which was higher than that of AC (45.22 mg·g-1) but less than that of MIL-101(Cr) (50.5 mg·g-1). The adsorption of Cr(VI) on MIL-101(Cr)/AC is a spontaneous exothermic process and best fitted with the second-order kinetic model and Langmuir isotherm model. The composite of MIL-101(Cr)/AC, is a green adsorbent and shows good reusability for Cr(VI) removal from water.
- Subjects
CHROMIUM removal (Water purification); AQUEOUS solutions; ADSORPTION (Chemistry); LANGMUIR isotherms; ACTIVATED carbon; ADSORPTION capacity
- Publication
Desalination & Water Treatment, 2023, Vol 307, p130
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2023.29862