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has been cited by the following article:
- TITLE: A Novel Absorbent of Nano-Fe Loaded Biomass Char and Its Enhanced Adsorption Capacity for Phosphate in Water
- AUTHORS: Hongguang Zhou,Zhenmao Jiang,Shiqiang Wei
JOURNAL NAME: Journal of Chemistry
Sep 16, 2014
- ABSTRACT: A novel composite adsorbent of Fe loaded biomass char (Fe-BC) was fabricated to treat phosphorus in water. Fe-BC was prepared by a procedure including metal complex anion incorporation and precipitation with the pyrolysis char of corn straw as supporting material. The abundant porous structures of the as-prepared sample can be easily observed from its scanning electron microscopy (SEM) images. Observations by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses show that inorganic nanoiron oxides deposited in the composite could be amorphous hydrous iron oxide α-FeOOH. Adsorption of phosphate onto the Fe-BC composite and its precursor (BC) from aqueous solutions were investigated and discussed. The equilibrium adsorption data of phosphate was described by Langmuir and Freundlich models, and Langmuir isotherm was found to be better fitted than Freundlich isotherm. The maximum phosphate adsorption capacity for phosphate of Fe-BC was as high as 35.43？mg/g, approximately 2.3 times of BC at 25°C. The adsorption kinetics data were better fitted by pseudo-second-order model and intraparticle diffusion model, indicating that the adsorption process was complex. The Fe-BC composite has been proved as an effective adsorbent of phosphate from aqueous solutions owing to its unique porous structures and the greater Lewis basicity of the α-FeOOH. 1. Introduction Phosphorus is considered as the main culprit of lake eutrophication . Excess phosphorus will stimulate the algal blooms, causing deterioration of water quality . In recent years, human activities dramatically increased the loads of phosphate in environment and its cycling rate on Earth, such as the production and application of a plenty of detergents, agricultural pesticides, and fertilizers . The increased amount of phosphorus in water bodies poses greater potentials to the occurring of eutrophication. It has been reported that the red tide may occur at concentration of phosphorus higher than 0.03？mg/L in the lake (sea) . Municipal wastewater may contain variety concentrations of phosphate ranging from 4 to 15？mg-P/L, and industrial wastewater (such as detergent manufacturing) may contain phosphate levels well in excess of 10？mg-P/L . Hence high effective methods for the removal of phosphate from wastewater need to be established. Traditional biological treatment of phosphorus has been proved to be highly variable due to its hard operation conditions ; thus discharge limits of phosphate were hardly matched depending only on this technology regardless of its high cost.