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rxchang1698铁杆木虫 (小有名气)
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帮忙修改英文摘要 6个金币
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由于英文水平很差，请高手帮忙修改，有金币奖励。 中文摘要：结果表明：由于其不能捕获光生电子，Na+、Mg2+、Ca2+本身对TiO2薄膜光催化还原Cr(Ⅵ)的反应速率影响不大；Al3+吸引电子能力较强，成为光生电子和Cr(VI)之间的桥梁，促进了Cr(Ⅵ)的还原；浓度为1mmmol/L时，Cu2+显著地促进了Cr(VI)的光催化还原，其主要原因是Cu2+捕获光生电子的能力很强，起到了催化剂的作用，而浓度大于10mmol/L时，Cu2+形成单质Cu以及对紫外光的吸收都使促进作用降低；Ni2+未充满的d轨道具有获得并传递光生电子的能力，也促进了Cr(Ⅵ)的还原；在浓度同为1mmol/L时，对Cr(Ⅵ)光催化还原的促进作用依次为：Cu2+>Al3+>Ni2+>Na+、Ca2+、Mg2+。 作者自己写的英文摘要：The results indicated that, Na+ ,Ca2+ and Mg2+ have not negative effects on rate of photocatalytic reduction of Cr(Ⅵ) because themselves were highest oxidation state and cant capture photogenerated electrons. Al3+ enhanced the rate of reduction of Cr(Ⅵ) to Cr(Ⅲ)due to itself with high charge, and the photogenerated electrons were attracted and then transfer to Cr(Ⅵ). 1mmol/L Cu2+ were found to significantly accelerate the photocatalytic reduction of Cr(Ⅵ) , which attribute to Cu2+ could easily capture photogenerated electrons and played a catalyst role; however, the acceleration reduced when the concentration of Cu2+was 10mmol/L owing to a portion Cu2+ was converted to Cu and the light intensity to the TiO2 surface was cut down. Based on the same mechanism with Cu2+, Ni2+ promoted the reduction of Cr(Ⅵ),too. When the concentration of these inorganic anions was 1mmol/L, the promotion for the photocatalytic reduction of Cr(Ⅵ) in order of Cu2+>Al3+>Ni2+>Na+,Ca2+,Mg2+. |
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3楼2009-03-06 13:08:24
natural01
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rxchang1698(金币+1,VIP+0):尽管并不完美，但对本人也有参考价值，况且等了半天就你一个，我就把硬币给你了 3-6 16:12
rxchang1698(金币+1,VIP+0):尽管并不完美，但对本人也有参考价值，况且等了半天就你一个，我就把硬币给你了 3-6 16:12
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The results indicated that, Na+ ,Ca2+ and Mg2+ had almost no effects on the rate of photocatalytic reduction of Cr(Ⅵ) because they couldnt capture photogenerated electrons. Al3+ enhanced the rate due to its high charge, so that the photogenerated electrons were attracted and then transferred to Cr(Ⅵ). 1mmol/Lof Cu2+ were found to accelerate the reaction significantly , because Cu2+ could easily capture photogenerated electrons as a catalyst; however, the acceleration reduced when the concentration of Cu2+ came to 10mmol/L owing to the conversion of cu and larger absorption to the UV light . Based on the same mechanism with Cu2+, Ni2+ promoted the reduction of Cr(Ⅵ),too. The promotion for the photocatalytic reduction of Cr(Ⅵ) was in the order of Cu2+>Al3+>Ni2+>Na+,Ca2+,Mg2+.at the concentration of 1mmol/L 不是很专业，试一下，算是抛砖引玉吧  |
4楼2009-03-06 14:04:08
rxchang1698
铁杆木虫 (小有名气)
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5楼2009-03-06 16:15:45
