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Nanometer lanthanum hydroxide modified anionic polymer for deep fluoride removal: adsorption properties and mechanism study

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Progress in Natural Science:Materials International 2023年第6期33卷 833-842页

作者： Bingling Jia Ye Li Junpeng Guo Feng Zhou Yunchen Guo Yunhang Yang Department of Resources and Environmental Engineering Wuhan University of Technology

The development of chemical industry has brought about serious fluoride pollution,and there is an urgent need to develop an adsorbent with high efficiency and stability for fluoride *** the remarkable adsorption capacity of lanthanum hydroxide hydrate for fluoride ions,its industrial application is limited by powder leaching and strict pH *** this study,lanthanum-containing anionic resin(HLO-D201) was synthesized by the method of precursor introduction and in-situ deposition,mainly by introducing La3+into the resin,adding sodium hydroxide to precipitate it in the resin pore,forming hydrated lanthanum *** characterization analysis showed that hydrated lanthanum oxide(HLO) was successfully introduced into the porous matrix of the resin and existed in the form of crystalline hydrated *** adsorption experiments demonstrated that HLO-D201could effectively adsorb fluoride ions in a wide pH range(2-10).Since nano La(OH)3was encapsulated in the resin pore,the loss of La(OH) 3 was greatly reduced,and under the condition of competitive adsorption of several coexisting ions,Only phosphoric acid group interferes obviously with the adsorption of F-.The synthesized HLO-D201 still showed good adsorption capacity after regenerated by NaOH-NaCl composite solution for six *** removal mechanism of fluoride by HLO-D201 is mainly electrostatic attraction and ligand ***,HLO-D201 is a kind of fluorine removal adsorbent with excellent performance and wide application prospects.

关键词： fluoride adsorption Anionic resin Industrial application Hydrated lanthanum oxide Industrial wastewater

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Removal of fluoride from water using titanium-based adsorbents

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Frontiers of Environmental Science & Engineering 2010年第4期4卷 414-420页

作者： Zhijian LI Shubo DENG Xueying ZHANG Wei ZHOU Jun HUANG Gang YU Department of Environmental Science and Engineering POPs Research CenterTsinghua UniversityBeijing 100084China

Three adsorbents including TiO_(2),Ti-Ce,and Ti-La hybrid oxides were prepared to remove fluoride from aqueous *** Ti-Ce and Ti-La hybrid adsorbents obtained by the hydrolysis-precipitation method had much higher sorption capacity for fluoride than the TiO_(2) adsorbent prepared through *** earth(Ce and La)oxides and TiO_(2) exhibited a synergistic effect in the hybrid adsorbents for fluoride *** sorption equilibrium of fluoride on the three adsorbents was achieved within 4 h,and the pseudo-second-order model described the sorption kinetics *** sorption isotherms fitted the Langmuir model well,and the adsorption capacities of fluoride on the Ti-Ce and Ti-La adsorbents were about 9.6 and 15.1 mg·g^(-1),respectively,at the equilibrium fluoride concentration of 1.0 mg·L^(-1),much higher than the 1.7 mg·g^(-1) on the TiO_(2).The sorption capacities of fluoride on the three adsorbents decreased significantly when the solution pH increased from 3 to *** electrostatic interaction played an important role in fluoride removal by the three adsorbents,and Fourier transform infrared(FTIR)analysis indicated that the hydroxyl groups on the adsorbent surface were involved in fluoride adsorption.

关键词： fluoride adsorption titanium dioxide titanium-based adsorbent sorption mechanism

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