:Evaluation of natural goethite on the removal of arsenate and selenite from water论文

:Evaluation of natural goethite on the removal of arsenate and selenite from water论文

本文主要研究内容

作者(2019)在《Evaluation of natural goethite on the removal of arsenate and selenite from water》一文中研究指出:Elevated arsenic and selenium concentrations in water cause health problems to both humans and wildlife. Natural and anthropogenic activities have caused contamination of these elements in waters worldwide, making the development of efficient cost-effective methods in their removal essential. In this work, removal of arsenate and selenite from water by adsorption onto a natural goethite(α-FeO OH) sample was studied at varying conditions. The data was then compared with other arsenate, selenite/goethite adsorption systems as much of literature shows discrepancies due to varying adsorption conditions. Characterization of the goethite was completed using inductively coupled plasma mass spectrometry, X-ray diffraction, Fouriertransform infrared spectroscopy, scanning electron microscopy, and Brunauer–Emmett–Teller surface area analysis. Pseudo-first order(PFO) and pseudo-second order(PSO) kinetic models were applied; including comparisons of different regression methods. Various adsorption isotherm models were applied to determine the best fitting model and to compare adsorption capacitates with other works. Desorption/leaching of arsenate and selenite was studied though the addition of phosphate and hydroxyl ions. Langmuir isotherm modeling resulted in maximum adsorption capacities of 6.204 and 7.740 mg/g for arsenate and selenite adsorption,respectively. The PSO model applied with a non-linear regression resulted in the best kinetic fits for both adsorption and desorption of arsenate and selenite. Adsorption decreased with increasing pH. Phosphate induced desorption resulted in the highest percentage of arsenate and selenite desorbed, while hydroxide induced resulted in the fastest desorption kinetics.

Abstract

Elevated arsenic and selenium concentrations in water cause health problems to both humans and wildlife. Natural and anthropogenic activities have caused contamination of these elements in waters worldwide, making the development of efficient cost-effective methods in their removal essential. In this work, removal of arsenate and selenite from water by adsorption onto a natural goethite(α-FeO OH) sample was studied at varying conditions. The data was then compared with other arsenate, selenite/goethite adsorption systems as much of literature shows discrepancies due to varying adsorption conditions. Characterization of the goethite was completed using inductively coupled plasma mass spectrometry, X-ray diffraction, Fouriertransform infrared spectroscopy, scanning electron microscopy, and Brunauer–Emmett–Teller surface area analysis. Pseudo-first order(PFO) and pseudo-second order(PSO) kinetic models were applied; including comparisons of different regression methods. Various adsorption isotherm models were applied to determine the best fitting model and to compare adsorption capacitates with other works. Desorption/leaching of arsenate and selenite was studied though the addition of phosphate and hydroxyl ions. Langmuir isotherm modeling resulted in maximum adsorption capacities of 6.204 and 7.740 mg/g for arsenate and selenite adsorption,respectively. The PSO model applied with a non-linear regression resulted in the best kinetic fits for both adsorption and desorption of arsenate and selenite. Adsorption decreased with increasing pH. Phosphate induced desorption resulted in the highest percentage of arsenate and selenite desorbed, while hydroxide induced resulted in the fastest desorption kinetics.

论文参考文献

  • [1].Efficient adsorption of As(V) on poly(acrylo-amidino ethylene amine) nanofiber membranes[J]. VU Dinhthao,LI Xiang,WANG Ce.  Chinese Science Bulletin.2013(14)
  • [2].项目年表[J].   城市环境设计.2015(11)
  • [3].Removal of lead and cadmium ions by single and binary systems using phytogenic magnetic nanoparticles functionalized by 3-marcaptopropanic acid[J]. Imran Ali,Changsheng Peng,Iffat Naz.  Chinese Journal of Chemical Engineering.2019(04)
  • [4].附录1:设计项目/APPENDIX Ⅰ:PROJECTS[J].   世界建筑.2002(10)
  • [5].Li Shouwei: Dream of a Renovated Mosque[J]. PENG CHUYUN.  China Today.2013(09)
  • [6].Exfoliated Mg–Al–Fe layered double hydroxides/polyether sulfone mixed matrix membranes for adsorption of phosphate and fluoride from aqueous solutions[J]. Zhiqian Jia,Shuang Hao,Xiaoyu Lu.  Journal of Environmental Sciences.2018(08)
  • [7].Phosphate adsorption performance of a novel filter substrate made from drinking water treatment residuals[J]. Wendong Wang,Cui Ma,Yinting Zhang,Shengjiong Yang,Yue Shao,Xiaochang Wang.  Journal of Environmental Sciences.2016(07)
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