Removal and recovery of phosphate from water by lanthanum hydroxide materials

Key factors for optimum performance in phosphate removal from contaminated water by a Fe–Mg–La tri-metal composite sorbent

“…With a low sorbent dosage of 15 mg/L, the phosphate concentration in effluent can be lower than 10 lg/L, which meets the USEPA standard for phosphate in drinking water. Comparing to other lanthanum based sorbents such as lanthanum loaded granular ceramic [20] and lanthanum hydroxide [21], our prepared sorbent required far lower dosage to obtain the nearly 100% removal efficiency. The corresponding adsorption capacity of phosphate onto the Fe-Mg-La sorbent can reach 66.1 mg/g, which is still higher than the maximum adsorption capacity of most reported sorbents at their optimal conditions [9,11,[18][19][20]10,24].…”

“…As reported in the literature, lanthanum might release from the solid at low pH values [21]. The concentrations of iron, magnesium and lanthanum in the solution after phosphate adsorption were tested in this study.…”

Efficient adsorption behavior of phosphate on La-modified tourmaline

“…Meanwhile, the competing effect of OH À as well as carbonate and bicarbonate might contributed to the sharp decrease of adsorption capacity at pH > 12.0, while the significant decrease at pH < 2.5 to the release of La by Xie et al [15]. The synthesized lanthanum hydroxides also performed well over a wide pH range from 2.5 to 12.0 [15]. The interesting feature of the La-modified tourmaline is that efficient phosphate adsorption was achieved at a wide pH range which will benefit its practical application in practical acidic and alkaline solutions.…”

“…Among these sorbents, La(III)-related sorbents have attracted wide attention due to their high efficiency and adsorption capacity. Xie et al prepared lanthanum hydroxide by neutralization of lanthanum chloride solution with waste alkaline solution, and the maximal adsorption capacity for phosphate reached 107.53 mg/g [15]. However, the sorbent preparation process was very complicated and time consuming.…”

Phosphorus Removal From Aqueous Solution By Adsorption Onto La-modified Clinoptilolite

“…While the pH was above 8.0, the adsorption capacity rapidly decreased probably due to the formation of lanthanum hydroxides. [19] Jie Xie [20] has found that OH -as well as carbonate and bicarbonate ions could compete with phosphate for adsorption sites when the performance for phosphate removal by Lanthanum hydroxide decreased sharply with increasing pH more than 9. So, this could be attributed to the formation of hydroxyl species of the lanthanum ions decreasing the number of phosphorus binding sites on the clinoptilolite surface.…”