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-1for 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+.
Chemistry Department, School of Science, Tianjin University, Tianjin, 300072, China.
Xiaofei
X
Ma
Chemistry Department, School of Science, Tianjin University, Tianjin, 300072, China.
Congzhi
C
Liu
Bioproducts and Bioprocesses National Science Program, Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK, S7N 0X2, Canada.
Debbie P
DP
Anderson
Bioproducts and Bioprocesses National Science Program, Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK, S7N 0X2, Canada; Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, SK, S7N 5A9, Canada. Electronic address: peter.chang@agr.gc.ca.
Peter R
PR
Chang
D000327:Adsorption; D002482:Cellulose / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007854:Lead / Q000032:analysis* / Q000737:chemistry*; D011122:Polyphosphates / Q000737:chemistry; D016062:Porosity; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
D011122:Polyphosphates; D014874:Water Pollutants, Chemical; D007854:Lead; D002482:Cellulose; C009293:trimetaphosphoric acid
Adsorption; Cellulose; Chemical modification; Porous materials