Ferric oxyhydroxide loaded anion exchanger （FOAE） hybrid adsorbent was prepared by loading nanosized ferric oxyhydroxide （FO） on anion exchanger resin for the removal of phosphate from wastewater. TEM and XRD anal...Ferric oxyhydroxide loaded anion exchanger （FOAE） hybrid adsorbent was prepared by loading nanosized ferric oxyhydroxide （FO） on anion exchanger resin for the removal of phosphate from wastewater. TEM and XRD analysis confirmed the existence of FO on FOAE. After FO loading, the adsorption capacity of the hybrid adsorbent increased from 38.70 to 51.52mg.g-1. Adsorption processes for both FOAE and anion resin were better fit to the pseudo first order model. Batch adsorption experiments revealed that higher temperature （313K）, higher initial phosphate concentration （50 mg.L-1） and lower solution pH （pH value of 2） would be more propitious to phosphate adsorption. Competition effect of coexisting anions on phosphate removal can be concluded as sulfate 〉 nitrate 〉 chloride. Freundlich isotherm model can describe the adsorption of phosphate on FOAE more accurately, which indicated the heterogeneous adsorption occurred on the inner-surface of FOAE.展开更多
Antibiotic contamination in aquatic environments poses serious risks to ecosystems and public health,necessitating the development of effective removal technologies.In this study,a novel biochar-supported ferric oxyhy...Antibiotic contamination in aquatic environments poses serious risks to ecosystems and public health,necessitating the development of effective removal technologies.In this study,a novel biochar-supported ferric oxyhydroxide(Fe OOH/BC)composite catalyst was developed for the activation of peracetic acid(PAA)to degrade cefapirin(CFP),a widely used and persistent cephalosporin antibiotic.The catalyst featured highly dispersed Fe OOH nanoparticles and enhanced interfacial electron transfer,enabling efficient activation of PAA through dual pathways involving both radical and non-radical species.Fe OOH/BC-1 exhibited the highest catalytic activity,where high-valent iron,singlet oxygen,and surface-bound reactive species played the primary roles in CFP degradation.Fe(Ⅲ)active sites generate high-valent iron oxo,while N active sites in biochar accounted for the direct electron transfer.This work provides a new approach for activating PAA in the degradation of emerging contaminants and offers a feasible method for catalyst regeneration in wastewater treatment applications.展开更多
This paper investigated the effects of five kinds of Au surfaces terminated with and without functional groups on the crystallization of ferric oxides/oxyhydroxides in the suspension condition. Self-assembled monolaye...This paper investigated the effects of five kinds of Au surfaces terminated with and without functional groups on the crystallization of ferric oxides/oxyhydroxides in the suspension condition. Self-assembled monolayers （SAMs） were used to create hydroxyl （-OH）, carboxyl （-COOH）, amine （-NH2） and methyl （-CH3） functionalized surfaces, which proved to be of the same surface density. The immersion time of substrates in the Fe（OH）3 suspension was divided into two time portions. During the first period of 2 h, few ferric oxide/oxyhydroxide was deposited except that E-Fe203 was detected on -NH2 surface. Crystallization for 10h evidenced more kinds of iron compounds on the functional surfaces. Goethite and maghemite were noticed on four functional surfaces, and maghemite also grew on Au surface. Deposition of ^-Fe203 was found on -OH surface, while the growth of orthorhombic and hexagon FeOOH were indicated on -NH2 surface. Considering the wide existence of iron compounds in nature, our investigation is a precedent work to the study of iron biomineralization in the suspension area.展开更多
基金This research was supported by the National Natural Science Foundation of China （Grant No. 51208352）, the Tianjin Research Program of Application Foundation and Advanced Technology （No.13JCQNJC09100）, and Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology （No. QA201209）.
文摘Ferric oxyhydroxide loaded anion exchanger （FOAE） hybrid adsorbent was prepared by loading nanosized ferric oxyhydroxide （FO） on anion exchanger resin for the removal of phosphate from wastewater. TEM and XRD analysis confirmed the existence of FO on FOAE. After FO loading, the adsorption capacity of the hybrid adsorbent increased from 38.70 to 51.52mg.g-1. Adsorption processes for both FOAE and anion resin were better fit to the pseudo first order model. Batch adsorption experiments revealed that higher temperature （313K）, higher initial phosphate concentration （50 mg.L-1） and lower solution pH （pH value of 2） would be more propitious to phosphate adsorption. Competition effect of coexisting anions on phosphate removal can be concluded as sulfate 〉 nitrate 〉 chloride. Freundlich isotherm model can describe the adsorption of phosphate on FOAE more accurately, which indicated the heterogeneous adsorption occurred on the inner-surface of FOAE.
基金financially supported by the Beijing Natural Science Foundation(No.8232035)the National Key R&D Program of China(No.2024YFF1308200)+4 种基金the National Key R&D Program of China(No.2021YFA1202500)the multi-dimensional coupling process of soil-surface-subsurface hydrology and vegetation regulation mechanism in loess region(No.U2243202)the Beijing National Laboratory for Molecular Sciences(No.BNLMS2023011)supported by the High-Performance Computing Platform of Peking Universitythe National Key Scientific and Technological Infrastructure project“Earth System Numerical Simulation Facility”(Earth Lab)。
文摘Antibiotic contamination in aquatic environments poses serious risks to ecosystems and public health,necessitating the development of effective removal technologies.In this study,a novel biochar-supported ferric oxyhydroxide(Fe OOH/BC)composite catalyst was developed for the activation of peracetic acid(PAA)to degrade cefapirin(CFP),a widely used and persistent cephalosporin antibiotic.The catalyst featured highly dispersed Fe OOH nanoparticles and enhanced interfacial electron transfer,enabling efficient activation of PAA through dual pathways involving both radical and non-radical species.Fe OOH/BC-1 exhibited the highest catalytic activity,where high-valent iron,singlet oxygen,and surface-bound reactive species played the primary roles in CFP degradation.Fe(Ⅲ)active sites generate high-valent iron oxo,while N active sites in biochar accounted for the direct electron transfer.This work provides a new approach for activating PAA in the degradation of emerging contaminants and offers a feasible method for catalyst regeneration in wastewater treatment applications.
文摘This paper investigated the effects of five kinds of Au surfaces terminated with and without functional groups on the crystallization of ferric oxides/oxyhydroxides in the suspension condition. Self-assembled monolayers （SAMs） were used to create hydroxyl （-OH）, carboxyl （-COOH）, amine （-NH2） and methyl （-CH3） functionalized surfaces, which proved to be of the same surface density. The immersion time of substrates in the Fe（OH）3 suspension was divided into two time portions. During the first period of 2 h, few ferric oxide/oxyhydroxide was deposited except that E-Fe203 was detected on -NH2 surface. Crystallization for 10h evidenced more kinds of iron compounds on the functional surfaces. Goethite and maghemite were noticed on four functional surfaces, and maghemite also grew on Au surface. Deposition of ^-Fe203 was found on -OH surface, while the growth of orthorhombic and hexagon FeOOH were indicated on -NH2 surface. Considering the wide existence of iron compounds in nature, our investigation is a precedent work to the study of iron biomineralization in the suspension area.
