Highly Efficient Low-Concentration Phosphate Removal from Effluents by Recoverable La(OH)₃/Foamed Nickel Adsorbent

Abstract

Lanthanum-based materials have attained increasing attention because of their high adsorption property of phosphate ions and their environmental harmlessness. However, challenges still remain to improve the phosphate adsorption capacity and find suitable materials for the lanthanum attachment substrate. Nickel foam with characteristics such as excellent uniformity, large specific surface area, high porosity, and low conductivity is considered to be the alternative for the preparation of lanthanum-based adsorption materials. An efficient adsorbent foamed nickel-based La (OH) 3 nanowire was first prepared with a facile one-step electrodeposition method. The batch static adsorption tests of simulative wastewater (e.g., coexisting ions and solution pH values) were employed to investigate the phosphate adsorption kinetics and solution matrix effects of the materials. The results indicate that the composite exhibits fast adsorption kinetics within 30 min and high selectivity to phosphate under interference from competing ions. The pH value of wastewater has great influence on the absorption of phosphate, and optimal adsorption capacity can be achieved over a pH 4−6 range. Various findings revealed that the adsorption behavior of lanthanum hydroxide/foamed nickel [La(OH) 3 /Ni] followed inner-sphere adsorption through the ligand-exchange mechanism. The prepared material is expected to be an enormous potential candidate for the removal of low-concentration phosphorus from effluents.

Rapid and easy preparation of self-supporting La-mixed NiMoO4 nanofloral materials and their capacitance properties

“…After 2000 cycles, the specific capacitance can reach 631.8 F g À1 at a current density of 5 A g À1 , with approximately 25.5% loss of specific capacitance, while NiMoO 4 nanorods have approximately 47.6% loss. Yin et al 41 prepared nano tube-shaped NiMoO 4 using a hydrothermal method, with a specific capacitance of 864 F g À1 at a current density of 1 A g À1 . After 1000 cycles, the specific capacitance remained at 71%.…”

Preparation and Characterization of an Invasive Plant-Derived Biochar-Supported Nano-Sized Lanthanum Composite and Its Application in Phosphate Capture from Aqueous Media

“…With the rapid development of industrial and agricultural sectors, water bodies around the world increasingly suffer varying degrees of pollution, − among which phosphorus pollution has attracted increasing attention. ,− Phosphorus, as an indispensable nutritive substance on the earth, is beneficial to the normal growth of all living organisms. − However, excessive discharge of phosphate (PO 4 3– ) to water bodies can accelerate eutrophication, leading to undesirable blue algae blooming, water quality worsening, and potential threats to human health . Based on the data available in the literature, , total phosphorous can vary from 8.5 mg L –1 in landfill leachate to 740 mg L –1 in fresh urine.…”

Efficient removal of phosphate through adsorption by acidified diatomite loaded with La2O2CO3

“…Moreover, lanthanum hydroxide and lanthanum oxalate were also used to increase phosphate adsorption capacity, and they achieved better performance. 17,18 Park et al reported PVA nanofibers modified with lanthanum carbonate (La 2 (CO 3 ) 3 ) with a high capacity for phosphate removal. 19 Zuo et al 20 used ceramic adsorbents loaded with lanthanum oxide (La 2 O 3 ) to remove phosphorus from wastewater.…”