DOI: 10.1016/j.watres.2019.01.049
Scopus记录号: 2-s2.0-85062103844
论文题名: NaLa(CO 3 ) 2 hybridized with Fe 3 O 4 for efficient phosphate removal: Synthesis and adsorption mechanistic study
作者: Hao H. ; Wang Y. ; Shi B.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 155 起始页码: 1
结束页码: 11
语种: 英语
英文关键词: Adsorption
; Eutrophication
; Lanthanum carbonate
; Magnetic separation
; Phosphate
英文摘要: Effectively eutrophication control and phosphate recovery have received increasing attention in recent years. In this study, a regenerable magnetic NaLa(CO 3 ) 2 /Fe 3 O 4 composites (MLC) which includes a novel phosphate-binding lanthanum species NaLa(CO 3 ) 2 hybridized with Fe 3 O 4 nanoparticle was developed through a modified solvothermal method for phosphate removal from contaminated water. Based upon preliminary screening of synthesized MLC with different La-to-Fe molar ratios in terms of phosphate adsorption capacity and synthetic product yield, a MLC composite with a La-to-Fe molar ratio of 2:1 (MLC-21) was selected for further characterization and evaluation. MLC-21 exhibits a high magnetic separation efficiency of 97%, high phosphate adsorption capacity of 77.85 mg P/g, wide applicable scope of pH ranging from 4 to 11, excellent selectivity for phosphate in the presence of competing ions (Cl − , NO 3 − , HCO 3 − , SO 4 2− , Ca 2+ , and Mg 2+ ), good reusability with above 98% desorption efficiency using NaOH–NaCl mixture and 83% adsorption capacity remained during five recycles. Furthermore, a real effluent wastewater with phosphate concentration of 1.96 mg P/L was used to verify the performance of MLC-21 through a magnetic separation integrated system (AMSS). By using the response surface methodology (RSM), the optimum parameters were determined to be 0.26 g/L of adsorbent dosage, 26.28 h of adsorption time and 24.12 min of magnetic separation time for meeting the phosphate emission standard of 0.5 mg P/L. The phosphorus in three representative eutrophic water bodies can be efficiently reduced to below 0.1 mg P/L by MLC-21 adsorption at different dosages. Electrostatic attraction and the inner-sphere complexation between La(HCO 3 ) 2 + /La(CO 3 ) 2 − and P via ligand exchange forming LaPO 4 were responsible for the phosphate adsorption mechanisms of MLC. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121924
Appears in Collections: 气候变化事实与影响
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作者单位: College of Environmental Science and Engineering, Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, No. 35, Tsinghua East Rd, Beijing, 100083, China; Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, No. 18, Shuangqing Rd, Beijing, 100085, China; University of Chinese Academy of Sciences, No. 19, Yuquan Rd, Beijing, 100049, China
Recommended Citation:
Hao H.,Wang Y.,Shi B.. NaLa(CO 3 ) 2 hybridized with Fe 3 O 4 for efficient phosphate removal: Synthesis and adsorption mechanistic study[J]. Water Research,2019-01-01,155