Journal
RSC ADVANCES
Volume 6, Issue 55, Pages 50128-50137Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra05253c
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Funding
- 973 Program [2013CB632402]
- NSFC [21307038, 21577046, 21433007, 51320105001, 51272199]
- Outstanding Young Science and Technology Innovation Team Program of Hubei Provincial Universities [T201514]
- Fundamental Research Funds for the Central Universities [2015-III-034]
- Self-determined and Innovative Research Funds of SKLWUT [2015-ZD-1]
- Natural Science Foundation of Hubei Province of China [2015CFA001]
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Herein, Mg-Al layered double hydroxide (LDH) was firstly prepared by a water-in-oil microemulsion method and the prepared LDH sample was further calcined at different temperatures. The calcined LDH samples were carefully characterized using XRD, nitrogen adsorption, TEM, TGA, XPS, FTIR and zeta potential measurements. Calcined and uncalcined LDH samples were used as adsorbents to remove orange II (O-II) dye in water. Adsorption experiments indicated calcination temperatures had an obvious influence on the adsorption affinity of LDH, and the 500 degrees C calcined LDH sample (LDH-500) exhibited the maximum adsorption capacity of 602 mg g(-1) larger than that of LDH (224 mg g(-1)). The pseudosecond-order model was the best kinetic model to describe O-II adsorbed on the surface of the adsorbent, and the dye adsorption was fitted well using the Langmuir model for the prepared samples. The adsorption mechanism of O-II dye onto the calcined and uncalcined LDHs samples was mainly related to electrostatic interaction between the anionic O-II molecules and positively charged surface of the adsorbents, and the slow intercalation of O-II into the layers of LDH and reconstruction of LDH-500.
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