Abstract
Tannin/cellulose microspheres (T/C) were successfully prepared via a facile homogeneous reaction in a water/oil (W/O) emulsion for removing Pb(II) ions from aqueous solution. The structure of the microspheres was characterized by scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, and a zeta potential test. The effects of pH, adsorbent dosage, contact time, and temperature on adsorption ability were investigated. The results showed that T/C microspheres could combine Pb(II)ions via electrostatic attractions and physical adsorption. Adsorption kinetics could be better described by the pseudo-second-order kinetic model. The adsorption behaviors were in agreement with the Langmuir adsorption isotherm model with a fitting correlation coefficient of 0.9992. The maximum adsorption capacity was 23.75 mg/g from the Langmuir isotherm evaluation at 308K with an initial pH of 5. The results suggested that tannin/cellulose microspheres could be a low-cost and effective adsorbent for removing Pb(II) ions from aqueous solution.
Highlights
In recent decades, water pollution with heavy metal ions attracted great attention due to their long-term risk to ecosystems and living organisms [1,2]
Tannin-immobilized cellulose microspheres or hydrogels were successfully fabricated via a facile homogeneous reaction for the removal of cationic dye from aqueous solution in our previous work [14]
T/C microspheres were fabricated through a facile homogeneous reaction in a W/O emulsion according to our previous work [14]
Summary
Water pollution with heavy metal ions attracted great attention due to their long-term risk to ecosystems and living organisms [1,2]. Owing to the high content of adjacent phenolic hydroxyls, tannins exhibit excellent chelating affinity toward various metal ions in water [8], Polymers 2019, 11, 548; doi:10.3390/polym11030548 www.mdpi.com/journal/polymers. A biodegradable polysaccharide, is the most abundant biopolymer in plants [11] It has safe characteristics such as no taste, insolubility, and stability in water and most organic solvents. Tannin-immobilized cellulose microspheres or hydrogels were successfully fabricated via a facile homogeneous reaction for the removal of cationic dye from aqueous solution in our previous work [14]. Tannin-immobilized cellulose microspheres were fabricated via a homogeneous reaction in a water/oil (W/O) emulsion. The adsorption isotherms, kinetics, and factors affecting Pb(II)adsorption were investigated to evaluate the adsorption ability of tannin/cellulose (T/C) microspheres
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