臺灣博碩士論文加值系統

本研究以硝酸鐵合成針鐵礦並覆膜於脫硫渣上,探討其對脫硫渣吸附腐植
酸之影響.實驗中並以各種顯微結構分析方法瞭解合成針鐵礦與覆膜前後
脫硫渣之表面形態及物化特性,另以恆溫批次吸附與連續流管柱吸附實驗
探討脫硫渣對腐植酸吸附之效果.經SEM,TEM,XRD等顯微結構分析結果顯
示,以硝酸鐵在高pH狀況下可順利合成針鐵礦,其表面積經BET測試約
在120-140m2/g.脫硫渣經覆膜後其SEM,TEM,EDS等顯微分析結果顯示表面
有針狀結晶物生成且Fe元素比例明顯上升,表示針鐵礦可覆膜於脫硫渣上,
但脫硫渣經覆膜後因針鐵礦覆蓋其表面原有孔洞以致於其表面積反由4.99
m2/g降至2-3m2/g.對腐植酸DOC之吸附去除效果上,覆膜前後脫硫渣中以未
覆膜脫硫渣去除最佳(76.67%),此主要是因為脫硫渣表面有大量游離氧化
鈣,其於高pH狀況下(pH>11)可發揮吸附沉澱效應有助於腐植酸之去除.但
若將吸附反應之pH控制在9以下時,則可發現針鐵礦覆膜脫硫渣對腐植酸之
吸附效果隨pH下降而有增加之趨勢.而本研究之恆溫批次結果以
Freundlich吸附模式描述最適,且參數K值是以未覆膜脫硫渣為最高.覆膜
前後脫硫渣對腐植酸之管柱吸附實驗結果顯示,貫穿曲線均有遲滯現象,其
中以未覆膜脫硫渣C/Co約在20%時即開始遲緩為最明顯,顯示腐植酸之管柱
吸附仍以未覆膜脫硫渣為最佳. 關鍵字:α-FeOOH,脫硫渣,腐植酸,吸
附

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