Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 499, Issue -, Pages 151-158Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.03.101
Keywords
UiO-66; Acid-promoted synthesis; Selective adsorption; Anionic dyes
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Funding
- Natural Science Key Project of the Jiangsu Higher Education Institutions [15KJA220001]
- Jiangsu Specially-Appointed Professor Program [201411]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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UiO-66 was modulated by addition of acetic acid or HC1 in the precursor solution. The resulting acetic acid-promoted UiO-66 has more regular octahedral structures and high surface areas of 892-1090 m(2)/g. Anionic dyes (methyl orange (MO) and Congo red (CR)) and cationic dyes (methylene blue (MB) and rhodamine B (RhB)) were examined for the selective dye adsorption on various UiO-66. The acid promoted UiO-66 exhibits an excellent selective adsorption to anionic dyes, where the adsorption capacities of MO and MB are 84.8 and 13.2 mg/g, respectively. However, UiO-66 prepared without acid shows similar adsorption to both anionic dye MO (70.4 mg/g) and cationic dye MB (67.5 mg/g). Mixed dyes (MO/MB and MO/RhB) adsorption on acid-promoted UiO-66 further proves the selective adsorption to anionic dyes. The adsorption mechanism was studied by testing the Zeta potential of acid-promoted UiO-66, and more positive Zeta potential (hydrogen ions) of UiO-66 is beneficial to the anionic dye adsorption. (C) 2017 Elsevier Inc. All rights reserved.
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