Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 617, Issue -, Pages 363-371Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.03.022
Keywords
Ni; Cr LDHs; Assembled; Unassembled; Adsorption; Methyl orange
Categories
Funding
- National Key Research and Development Program of China [2020YFC1808103]
- National Nature Science Foundation of China [20907029, 21577085]
- Natural Science Fund Projects of Shanghai Municipal Science and Technology Commission [14ZR1415600]
- Innovative Project of Shanghai Municipal Education Commission [10YZ07]
- Key Subject of Shanghai Municipality [S30109]
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The study showed that unassembled LDHs exhibited greater adsorption capacities and shorter equilibrium time for methyl orange, possibly due to their loose structure and more exposed adsorption sites. This suggests that unassembled LDHs could be an effective pathway for exploring the adsorption sites of LDHs.
The lamella aggregation state of layered double hydroxides (LDHs) may affect their sorption capacity for organic compounds. The dried LDH samples (Ni/Cr LDH-FA-D and Ni/Cr LDH-H2O-D) and the undried samples (Ni/Cr LDH-FA-W and Ni/Cr LDH-H2O-W) were flexibly prepared by a co-precipitation method in formamide (FA) and water, respectively. The results of X-ray diffraction (XRD) and transmission electron microscope (TEM) showed that the undried LDHs were unassembled, which had no the stacking layers but had a pseudohexagonal nanosheet lamella structure. And the unassembled LDH layers can be assembled again during the dry process. Ni/Cr LDH-FA-W and Ni/Cr LDH-H2O-W showed much greater adsorption capacities towards methyl orange (MO) than Ni/Cr LDH-FA-D and Ni/Cr LDH-H2O-D, as well as shorter time to reach equilibrium. The maximum adsorption capacity of MO could be calculated to 806 mg/g and 740 mg/g for Ni/Cr LDH-FA-W and Ni/Cr LDH-H2O-W by Langmuir-type simulation. The greater adsorption capacities of unassembled LDH could be attributed to the loosen structure and much more exposed adsorption sites. It could be concluded that unassembled LDHs were an effective and conducive preparation pathway for the exploration of the adsorption sites of LDHs. (c) 2022 Elsevier Inc. All rights reserved.
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