Effect of Oxalic Acid on the Adsorption of Fluoride by Phosphate Rock from Aqueous Solution
The defluoridation capacity of phosphate rock in the presence of oxalic acid was investigated using batch experiments. Defluoridation capacity of phosphate rock was enhanced in the presence of oxalic acid, removing ﬂuoride from 22.46% up to 57.98% with 2.5 mmol/L oxalic acid. The contact time and pH for maximum ﬂuoride uptake were found 2 h and 5, respectively. Maximum adsorption capacity (0.36 mg/g) of ﬂuoride on phosphate rock was observed at 50 mg/L initial ﬂuoride concentration using 2 g adsorbent dose.
Qunjie Xu, Yanzhong Ju and Honghua Ge
Y. Wang et al., "Effect of Oxalic Acid on the Adsorption of Fluoride by Phosphate Rock from Aqueous Solution", Advanced Materials Research, Vols. 610-613, pp. 390-393, 2013