Premium
Yolk–shell microspheres assembled from Preyssler‐type NaP 5 W 30 O 110 14− polyoxometalate and MIL‐101(Cr) metal–organic framework: A new inorganic–organic nanohybrid for fast and selective removal of cationic organic dyes from aqueous media
Author(s) -
Hoseini AkramAlsadat,
Farhadi Saeed,
Zabardasti Abedin
Publication year - 2019
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4656
Subject(s) - polyoxometalate , adsorption , chemistry , rhodamine b , cationic polymerization , terephthalic acid , methyl orange , nuclear chemistry , metal organic framework , langmuir adsorption model , inorganic chemistry , selective adsorption , metal , polymer chemistry , catalysis , organic chemistry , photocatalysis , polyester
Novel inorganic–organic yolk–shell microspheres based on Preyssler‐type NaP 5 W 30 O 110 14− polyoxometalate and MIL‐101(Cr) metal–organic framework (P 5 W 30 /MIL‐101(Cr)) were synthesized by reaction of K 12.5 Na 1.5 [NaP 5 W 30 O 110 ], Cr(NO 3 ) 3 ·9H 2 O and terephthalic acid under hydrothermal conditions at 200°C for 24 h. The as‐prepared yolk–shell microspheres were fully characterized using various techniques. All analyses confirmed the incorporation of the Preyssler‐type NaP 5 W 30 O 110 14− polyoxometalate into the three‐dimensional porous MIL‐101(Cr) metal–organic framework. The results revealed that P 5 W 30 /MIL‐101(Cr) demonstrated rapid adsorption of cationic methylene blue (MB) and rhodamine B (RhB) with ultrahigh efficiency and capacity, as well as achieving rapid and highly selective adsorption of MB from MB/MO (MO = methyl orange), MB/RhB and MB/RhB/MO mixtures. The P 5 W 30 /MIL‐101(Cr) adsorbent not only exhibited a high adsorption capacity of 212 mg g −1 , but also could quickly remove 100% of MB from a dye solution of 50 mg l −1 within 8 min. The effects of some key parameters such as adsorbent dosage, initial dye concentration and initial pH on dye adsorption were investigated in detail. The equilibrium adsorption data were better fitted by the Langmuir isotherm. The adsorption kinetics was well modelled using a pseudo‐second‐order model. Also, the inorganic–organic hybrid yolk–shell microspheres could be easily separated from the reaction system and reused up to four times without any change in structure or adsorption ability. The stability and robustness of the adsorbent were confirmed using various techniques.