کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4407344 | 1618806 | 2016 | 10 صفحه PDF | دانلود رایگان |
• Porous cellulose spheres (PCS) were precipitated from a cellulose ionic liquid.
• Modified PCS (SPCS) were used to remove heavy metal ions from aqueous solution.
• Adsorption behavior of Pb2+ on SPCS fit the kinetic models.
• The maximum adsorption capacity reached 150.6 mg g−1.
Porous cellulose spheres (PCS) were fabricated by precipitating the spheres from a cellulose ionic liquid solution, followed by freezing, solvent exchange, and drying. PCS had low crystallinity and a large surface area that facilitated modification with trisodium trimetaphosphate (STMP) to introduce phosphate ester groups into the porous structure of the heterogeneous system. The STMP-modified PCS (SPCS) were used to remove heavy metal ions from aqueous solution. With increasing STMP dosage, the adsorption capacity of SPCS obviously improved due to chelation between Pb2+ and phosphate ester groups. The kinetic adsorption and isotherm data matched the pseudo-second order model and the Langmuir model well. The maximum adsorption capacity reached 150.6 mg g−1 for SPCS. SPCS were competitive with other absorbents because the phosphate ester groups and porous structure contributed to Pb2+ adsorption. Moreover, SPCS can be regenerated with ethylenediamine tetraacetic acid disodium salt (EDTA) solution for repetitious adsorption of Pb2+.
Journal: Chemosphere - Volume 165, December 2016, Pages 399–408