Preparation of the Lanthanum–Aluminum-Amended Attapulgite Composite as a Novel Inactivation Material to Immobilize Phosphorus in Lake Sediment

Abstract

In this study, a green solvent-free drying production method was used to prepare an attapulgite clay/lanthanum and aluminum (ACLA) composite as a novel phosphorus (P) sorbent to immobilize P in lake sediment. The prepared sorbent contained around 5% La and 2% Al. The maximum P sorption capacity of ACLA can reach as high as 34.6 mg P/g and is higher than most clay-based P sorbents. The addition of ACLA into sediment can effectively reduce sediment mobile P and simultaneously induce elevated inert P forms of HCl-P and NaOH-rP, which also can increase the stability of P in sediment. Long-term sediment core incubation indicated that 72.2% of total phosphorus and 90.7% of soluble reactive phosphate (SRP), as well as 44.2% SRP fluxes, can be reduced with a dosage of 466 mg/m2 of ACLA when compared with the control treatment. The P binding mechanism by ACLA is assigned to the intersphere P complexes and is mainly because of the formation of rhabdophane and aluminum phosphate precipitation on ACLA. This is confirmed by results of the XPS and 31P NMR spectroscopy, which indicate that the La/Al coexisting novel P inactivation agents are a promising sorbent for lake sediment P control.

Arsenic Oxidation and Removal from Water via Core–Shell MnO2@La(OH)3 Nanocomposite Adsorption

“…It is obvious that the binding energies of La 3d 5/2 and La 3d 3/2 after the arsenic removal shifted to higher values (approximately 0.4–0.8 eV), which suggested the possible electron transfer in the valence band of La 3d and the formation of the La–O–As inner-sphere complexation [ 30 , 31 , 49 ]. This observation has also been reported in the previous literature after phosphate removal [ 58 , 61 , 69 ]. Figure 7 c exhibits the As 3d spectra of the three samples.…”

Effective and selective adsorption of La3+ by a poly-N-isopropylacrylamide phosphoric modified cellulose aerogel

“…Fortunately, we have seen many times in the literature that there are phosphoric acid groups that use lanthanum to recover and separate wastewater, which shows that phosphoric acid groups have a high affinity for lanthanum and can specifically coordinate with lanthanum. [22][23][24] The interaction between La 3+ and phosphate groups is achieved by electrostatic interaction or chelation, while CNCs are extracted by sulfuric acid hydrolysis. The CNCs obtained by sulfuric acid hydrolysis have a large number of hydroxyl groups (-OH) on the surface and when a large number of hydroxyl groups (-OH) on the CNC surface were modified by phosphoric acid groups, the interaction between La 3+ and phosphoric acid groups could be used to adsorb La 3+ , thereby improving the adsorption capacity of the material.…”

Phosphorus Binding by Lanthanum Modified Pyroaurite-like Clay: Performance and Mechanisms

“…However, LMB still shows limited capacity for P uptake (ca. 10 mg P/g) and low P removal efficiency during practical application, mainly due to the complexation of La by humic substances (HAs) and CO 3 2– /HCO 3 – . , Recently, extensive efforts have been devoted to the design of new P binding agents with enhanced P binding efficiency, i.e., improved P uptake and stronger P binding to inhibit the possible P release by increasing active sites for selective P uptake and forming stable metal–P compounds (i.e., LaPO 4 ). For examples, Xu et al reported the fabrication of a La/Al composite with a highly positive surface, demonstrating enhanced P uptake and improved stability over a wide pH range in comparison to LMB.…”