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commandos2

银虫 (小有名气)

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专业: 海洋地质学

[交流] 求高手帮忙修改修改文章啊

因为英语不过关，已经被退回来了，是关于COD废水处理方面的，小虫金币不多，就全发了。谢谢了！

文章
ACFM-chemo.doc

文章+图 pdf
CHEM-S-09-00528.fdf

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1楼 2009-03-05 22:10:24

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

commandos2

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再来帮忙修改修改实验的一个部分吧，是COD随样品用量的变化的。75金币
3.2. Effect of sample dosage on the COD of wastewater
Fig. 3 shows the effect of sample dosage ranging from 0.0 to 20 mg•mL-1 on the COD removal of wastewater. The COD removal increases significantly with the dosage of RHM or RHA when the dosage was less than 20 mg•mL-1. Thereafter, the COD removal changes slightly and maintains at 73% (RHM) or 66% (RHA). Compared with RHA, the COD removal of RHM is much higher at identical dosages. For instance, the COD removal of RHM is ~18% higher than that of RHA when the sample dosage was 5 mg•mL-1. Moreover, the maximum COD removal of RHM (73.5%, at dosage of 15 mg•mL-1) is ~7% higher than that of RHA (66.5%, at dosage of 25 mg•mL-1). Because the surface area of RHA (433.90 m2•g-1) is twice as RHM (214.54 m2•g-1), RHA should present stronger adsorption ability than that of RHM. Therefore, the catalytic ability of RHM is stronger than that of RHA, attributed to the presence of MnFe2O4. Organics was adsorbed to the surface of RHM and then catalytic degraded by the ferrite nanoparticles during the wastewater treatment, which is consistent with former researches [38, 41] .
3.3. Effect of microwave treatment on the COD of wastewater
Fig. 4 shows the variations of the COD of wastewater as a function of microwave heating time. When the wastewater was treated by 20 mg•mL-1 RHM or RHA without microwave heating, the COD removal is as low as less than 7%, which is attributed to the inadequate contract between RHM and organics. When the microwave radiation was added, the COD removal starts to increase significantly. The COD removal increases considerably in the first 3 min, from 41% to 72% for RHM and 19% to 60% for RHA. Thereafter, the COD removal changes little and maintains at ~73% for RHM and ~65% for RHA.
The microwave treatment reveals that both RHM and RHA will reach theirs maximum COD removal within 6 min under the assist of microwave radiation. It is contributed to two reasons. First, microwave radiation will selective heat and motivate some special materials such as active carbon and magnetic materials to be hotspots [43] . These hotspots adsorb and catalytic degrade the organics of wastewater rapidly. Second, the quantum energy of microwave can motivate the rotation of molecules and decrease the activation energy of reactions, which facilitate the breaking of chemical bonds and the adsorption of RHM or RHA for organics [31, 44] . Note that RHM reaches its maximum COD removal earlier than RHA and the COD removal of RHM is higher than that of RHA at all periods, indicating that RHM is easier to be heated by the microwave radiation. It is still attributed to the presence of MnFe2O4.

[ Last edited by commandos2 on 2009-3-13 at 11:33 ]