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Fe(II) removal and Mg(II) retention by SPCD-ADM.
Three biochar types obtained from chemical-free pyrolysis of the dark-microalgae Chlorella vulgaris were tested as solid phase adsorbents for removal of Fe(II) and retention of Mg(II) from synthetic solutions, comparing them with compost-derived biochar (SPCD). Results showed the pyrolyzed biomaterials could remove 94% of Fe(II) from a 10mgL(-1) solution of ferrous sulfate, with or without the presence of Mg(II), but did not show any significant difference in their Mg(II) retention performance. This finding was supported by XPS spectra of the solid phases, which indicated no Mg(II) adsorption onto the biochars from the SPCD matrix. The Fe(II) adsorption onto the SPCD was significantly enhanced by the addition of an equal molar amount of Mg(II). The retention behavior of Mg(II) onto the biochars from both the acidic and neutral SPCD-ADM was superior to that of compost-derived biochars and also Fe(II) adsorption. Based on the water holding capacity of the biochar samples and the chemical composition of their adsorbed layers, the Fe(II)-Mg(II) removal mechanism in the SPCD-ADM was proposed to be the reduction of Fe(III) and adsorption of Mg(II) via electrostatic interactions. This study provides new insight into the application of biochar in water pollution remediation.The present invention relates to a method of fabricating a semiconductor device, and more particularly to a method of fabricating a semiconductor device using a spin-on-glass (hereinafter abbreviated as "SOG") process.
As the degree of integration of semiconductor devices has been increased, the size of a contact hole has been decreased to a range of submicron. In order to develop the semiconductor devices, to ac619d1d87
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