title: Removing Phosphorus from Aqueous Solutions Using Lanthanum Modified Pine Needles.
abstract: The renewable pine needles was used as an adsorbent to remove phosphorus from aqueous solutions. Using batch experiments, pine needles pretreated with alkali-isopropanol (AI) failed to effectively remove phosphorus, while pine needles modified with lanthanum hydroxide (LH) showed relatively high removal efficiency. LH pine needles were effective at a wide pH ranges, with the highest removal efficiency reaching approximately 85% at a pH of 3. The removal efficiency was kept above 65% using 10 mg/L phosphorus solutions at desired pH values. There was no apparent significant competitive behavior between co-existing anions of sulfate, nitrate, and chloride (SO4(2-), NO3(-) and Cl(-)); however, CO3(2-) exhibited increased interfering behavior as concentrations increased. An intraparticle diffusion model showed that the adsorption process occurred in three phases, suggesting that a boundary layer adsorption phenomena slightly affected the adsorption process, and that intraparticle diffusion was dominant. The adsorption process was thermodynamically unfavorable and non-spontaneous; temperature increases improved phosphorus removal. Total organic carbon (TOC) assays indicated that chemical modification reduced the release of soluble organic compounds from 135.6 mg/L to 7.76 mg/L. This new information about adsorption performances provides valuable information, and can inform future technological applications designed to remove phosphorus from aqueous solutions.
authors.affiliation: School of Environment, Northeast Normal University, Changchun, China.
authors.forename: Xianze
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Environment, Northeast Normal University, Changchun, China.
authors.forename: Zhongmou
authors.initials: Z
authors.lastname: Liu
authors.affiliation: School of Environment, Northeast Normal University, Changchun, China.
authors.forename: Jiancong
authors.initials: J
authors.lastname: Liu
authors.affiliation: School of Environment, Northeast Normal University, Changchun, China.|Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Changchun, China.
authors.forename: Mingxin
authors.initials: M
authors.lastname: Huo
authors.affiliation: School of Environment, Northeast Normal University, Changchun, China.|Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Changchun, China.
authors.forename: Hongliang
authors.initials: H
authors.lastname: Huo
authors.affiliation: School of Environment, Northeast Normal University, Changchun, China.|Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Changchun, China.
authors.forename: Wu
authors.initials: W
authors.lastname: Yang
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007811:Lanthanum / Q000737:chemistry*; D010758:Phosphorus / Q000302:isolation & purification*; D028223:Pinus / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus; C033562:lanthanum hydroxide; D007811:Lanthanum