Porous cellulose spheres: Preparation, modification and adsorption properties.
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+.
['Ma|Xiaofei|X|', 'Liu|Congzhi|C|', 'Anderson|Debbie P|DP|', 'Chang|Peter R|PR|']
D000327:Adsorption D002482:Cellulose D052918:Environmental Restoration and Remediation D007854:Lead D011122:Polyphosphates D016062:Porosity D014874:Water Pollutants, Chemical D018508:Water Purification
Cellulose Adsorption Chemical modification Porous materials