Magnetite/Lanthanum hydroxide for phosphate sequestration and recovery from lake and the attenuation effects of sediment particles

An effective approach for eutrophication control and phosphate recovery remains a longstanding challenge. Herein, we present a new technique for phosphate sequestration in lake and phosphate recovery using novel magnetically recoverable magnetite/lanthanum hydroxide [M-La(OH)(3)] hybrids that can be prepared using a simple one-pot synthesis method. Batch studies show that M-La(OH)(3) exhibits a strong sorption towards phosphate with sorption capacities of up to 52.7 mg-Pig at pH 7.0 in water. A simple model indicates that the efficiency of M-La(OH)(3) for phosphate sequestration in lake is significantly attenuated by 34-45% compared to that in water, due to interference from sediment particles. However, our results demonstrate that sediments suspensions mixed with a M-La(OH)(3) content of 1-3% exhibit a capability of up to 1.2 mg-Pig for sequestering external phosphate compared with that of 0.2 mg-Pig for pristine sediment at pH 7.3. M-La(OH)(3)-mixed sediment suspensions appear to effectively sequester phosphate over an environmentally relevant pH range from 4 to 8.5. Phosphorus (P) fractionation experiments indicate that the enhanced phosphate sorption by M-La(OH)(3)-mixed sediment suspensions is mainly due to the increased fractions of NaOH-P and inorganic P. This work indicates that the M-La(OH)(3) has the potential for phosphate sequestration and recovery from lake. (C) 2017 Elsevier Ltd. All rights reserved.