Porous composite sphere CMC-KCuFC-PEG for efficient cesium removal from wastewater
In this work, a highly stable porous composite CMC-KCuFC-PEG was prepared through the cross-linking reaction of biodegradable carboxymethyl cellulose sodium (CMC) and potassium copper ferrocyanide (KCuFC) using polyethylene glycol 6000 (PEG6000) as porogen for 137Cs removal from wastewater. The adsorption conditions including pH value, adsorbent dosage, contact time, initial Cs+ concentration, temperature and competitive ions were systematically investigated, and the results demonstrated that this CMC-KCuFC-PEG was effective and stable in the wastewater with a wide pH range (2-10) or NH4+. The maximum adsorption capacity of Cs+ was up to 149.8 mg/g. Moreover, adsorption kinetic and adsorption isotherm studies showed that the adsorption process of CMC-KCuFC-PEG was well fitted by the linear pseudo-second-order kinetic and Freundlich model, respectively. All the results suggest that CMC-KCuFC-PEG exhibits potential application on cesium removal from wastewater.