Facile Synthesis of Boron Organic Polymers for Efficient Removal and Separation of Methylene Blue, Rhodamine B, and Rhodamine 6G

Dodecahydro-closo-dodecaborate
anion (B12H122–) organic polymers
(BOPs) were facilely obtained
from aqueous solution via a simple and effective method. Single crystal
X-ray diffraction results insinuated that the BOPs were formed by
intermolecular forces between 4,4′-bipyridine and B12H122–. The presence of B12H122– gave the BOPs a certain degree
of electronegativity, which possessed excellent stability and high
adsorption capacity toward the cationic dyes methylene blue (MB),
rhodamine B (RB), and rhodamine 6G (RB6G). The adsorption capacity
of BOPs for MB, RB, and RB 6G dyes reached 3250 mg·g–1, 1388 mg·g–1, and 2033 mg·g–1, respectively. Through adsorption kinetics and adsorption isotherm
results, BOPs exhibited rapid kinetic adsorption and ultrahigh adsorption
capacity. Moreover, the BOPs materials could separate MB/MO, MB/RB,
MB/RB6G, RB/MO, and RB6G/MO mixed components efficiently by adjusting
the pH of the dye solution. It was worth mentioning that BOPs adsorbents
could be easily and rapidly regenerated and be recycled at least five
times without decreasing the adsorption capacity, indicating a potential
application in dye pollutants removal.