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| 针铁矿光催化染料废水的表面状态与作用机制 |
| Surface State and Mechanism for Photocatalytic Degradation of Dye Wastewater by Goethite |
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| DOI： |
| 中文关键词: 光类芬顿 催化剂 染料分子 可电离 表面化合态 |
| 英文关键词: Photo-Fenton-Like catalyst dyes molecule ionization surface speciation |
| 基金项目:国家自然科学基金资助项目 |
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| 摘要点击次数: 4893 |
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| 中文摘要: |
| 为了解光类芬顿反应时催化剂表面形态与可电离染料分子形态及相互作用,通过实验测定,结合protfit2.1表面络合模拟软件,得到所制备的针铁矿表面位密度为Nt=1.45×10-4mol·g-1,pKa1 =4.41和pKa2=6.86,零净质子电荷点pHpzc=5.64.针铁矿光催化降解模拟染料实验结果表明:随pH值升高,降解率下降,pH值为3时针铁矿表面化合态＞FeOH2+份额为96.25％、分子态份额为61.31％,脱色效率为65％;pH值为7时＞FeOH2+份额为0.11％、分子态份额为0.02％,脱色效率为20％,脱色效率呈现与＞FeOH2+及分子态份额正相关.由吸附催化理论推测染料分子与催化剂生成络合物FeⅢRn参与了催化反应的电子转移,形成光化学反应循环. |
| 英文摘要: |
| In order to understand the surface morphology of the catalyst and the form of ionizable dye molecules and their interaction in Photo Fenton reaction,fitting of experimental determination and the software of Surface complexation model of protfit2.1.we know preparation goethite,the surface density of which is Nt= 1.45 × 10-4mol﹒g-1,pKa1= 4.41 and pKa2= 6. 86,the Zero net proton charge point is pHpzc = 5.64. According to the experiment of photocatalytic degradation of dye goethite,with the increase of pH value,the degradation rate decreases. When the pH is 3,the surface speciation of goethite accounts for 96.25%,molecular state accounts for 61.31%,and decolonization efficiency is 65%. When the pH is 7,the surface speciation of goethite accounts for 0.11%,molecular state accounts for 0.02%,and decolonization efficiency is 20%. The decolorization efficiency is positive correlation to the molecular share of molecular state. According to the theory of adsorption and catalysis,it is deducted that dyes molecule and complexes FeIIIRngenerated by catalyst involves in the catalytic reaction of electron transfer,and results in the formation of photochemical reaction cycle. |
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