The Effect of α-FeOOH Coating on Desulfurization Slag for the Removal of Humic Acids

• Main Authors: Wu, Chung-Chu, 吳忠柱
• Other Authors: Juu-En Chang
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/42848381941107108292

碩士 === 國立成功大學 === 環境工程學系 === 86 === Adsorption of humic acid by desulfurization slag (DS) was conducted by both batch and column experiments to investigate the capabilities of DS for refractory organic removal. Also,α- FeOOH was synthesized by ferric nitrate andthen coated on desulfurization slag to examine its effect on the adsorptionefficacy.The results from SEM, TEM,and XRD analysis show that α-FeOOH was successfullysynthesized by ferric nitrate at high pH situation, the synthesizedα-FeOOH exhibits rod and needle in morphology with high BET surface area of 120-140m2/g. In the batch isotherm adsorption experiments, DS presents high adsorption capacity for humic acid and the DOC removal efficiency of 76.67% was obtained.It is due to the coagulation/ adsorption effect of free CaO on DS surface at highpH situation (pH>11). On the other hand, the adsorption efficacy of DS waseliminate as α-FeOOH coated on the DS surface. It is because that the coatedα-FeOOH would fulfill the micropore and also depress the coagulation/adsorptioneffect of free CaO of DS. Similar results also can be found in column adsorptiontests. The breakthrough curve of DS was retarded at C/Co of 20% while that ofthe α-FeOOH coated DS was retarded at C/Co of 40%.Key words: α-FeOOH, desulfurization slag, humic acid, adsorption