| Abstrakt: |
The pollution resulting from excessive phosphorus usage has garnered significant attention. In this study, the cellulose composite fiber was fabricated by immobilizing La doped UiO66-NH2nanoparticles onto cellulose fiber through a facile in-situ hydrothermal synthesis method. Nanosized UiO66-NH2particles were uniformly distributed on the CCF, and La doping induced defects in the crystal structure of UiO66-NH2, which provided active sites for phosphate absorption. The composite cellulose fiber materials exhibited fast (1 h) and effective (7.6 mg g−1) adsorption properties to phosphate compare to other adsorption materials. Moreover, the adsorption process for phosphorus were spontaneous and endothermic, which accorded with pseudo-second-order kinetic and Langmuir isotherm models. FTIR and XPS analyses elucidate that chemical bond and electrostatic attraction between Zr/La-O-P play pivotal roles in phosphate capture mechanism. The adsorption was driven by two interaction, namely electrostatic interaction between -NH2and phosphate and chemical bond of Zr-O-P and La-O-P. Notably, the composite fiber exhibited effective adsorption ability within a wide pH range of 3–7, and excellent selectivity to phosphate under common interfering ions such as SO42-, NO3-, and Cl-. Overall, this research has provided new thinking of La-UiO66-NH2/CCF as a promising phosphate adsorbent possessing favorable adsorption properties, which will facilitate the utilization of cellulose composite fibers in wastewater treatment. |
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