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北京石油化工學(xué)院2026年研究生招生接收調(diào)劑公告

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wangnavy11

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專業(yè): 環(huán)境化工

[求助] 化工方向的高手,尤其是超聲方面的

這是由于超聲降解有機(jī)物的機(jī)制是超聲空化效應(yīng)，而只有當(dāng)聲強(qiáng)達(dá)到空化閾值時(shí)才能產(chǎn)生空化效應(yīng)。隨著聲能密度的增加則空化效應(yīng)加強(qiáng)，促進(jìn)了A分子進(jìn)入吸附劑孔道和擴(kuò)散速度加快，從而促進(jìn)了對A的去除。因此聲強(qiáng)越大，降解效果越佳。但聲強(qiáng)太高會使處理能耗增高，另外在高聲強(qiáng)作用下，有可能破壞B分子；在某一極高聲強(qiáng)下，空化泡在負(fù)聲壓相會變得很大，導(dǎo)致其在正壓相不足以實(shí)現(xiàn)內(nèi)破裂，空化泡崩潰不充分(形成了屏蔽)，系統(tǒng)對超聲能量的利用率低。因此當(dāng)超聲聲強(qiáng)增大時(shí)，去除率的提高幅度有所減小.

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1樓 2012-09-25 22:03:49

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【答案】應(yīng)助回帖

However the initial concentration of methanol affects its removal ratio, the adsorption reaction is close to equilibrium after 3min from beginning,

and the increment of removal ratio is limited henceforth. The removed amount of methanol by B equal to the desorbed amount of methanol from the

active sites of B. While the initial concentration of methanol is high and the usage amount of B is fixed, with the same adsorption sites and

cavity position, more methanol molecules mean more competition and lower adsorption rate. As the initial concentration is low, less methanol

molecules with less competition would be easierly come into the cavities of B aiding by the vibration of ultrasonic waves, resulting in a higher

removal ratio.
這是由于超聲降解有機(jī)物的機(jī)制是超聲空化效應(yīng)，而只有當(dāng)聲強(qiáng)達(dá)到空化閾值時(shí)才能產(chǎn)生空化效應(yīng)。隨著聲能密度的增加則空化效應(yīng)加強(qiáng)，促進(jìn)了A分子進(jìn)入吸附劑孔道

和擴(kuò)散速度加快，從而促進(jìn)了對A的去除。因此聲強(qiáng)越大，降解效果越佳。但聲強(qiáng)太高會使處理能耗增高，另外在高聲強(qiáng)作用下，有可能破壞B分子；在某一極高聲強(qiáng)下

，空化泡在負(fù)聲壓相會變得很大，導(dǎo)致其在正壓相不足以實(shí)現(xiàn)內(nèi)破裂，空化泡崩潰不充分(形成了屏蔽)，系統(tǒng)對超聲能量的利用率低。因此當(dāng)超聲聲強(qiáng)增大時(shí)，去除率

的提高幅度有所減小.
The reason is that the mechanism of ultrasonic degradation of organic matter is ultrasonic cavitation effect, and cavitation effect only occurs

when the sound intensity reaches the cavitation threshold. With the increase in density of acoustic energy, cavitation effect would be strengthened

that promote A molecules into the adsorbent pores and accelerate its diffusion rate, thereby promoting the removal of A. Thus, the greater the

sound intensity, the better the degradation effect. However, if the sound intensity is too high, the operation energy consumption would increase,

moreover, B molecules might be damaged under the impact of high sound intensity; under certain very high sound intensity, cavitation bubbles would

become very large in negative acoustic pressure phase, and be insufficient to achieve the implosion in the positive pressure phase, resulting in

the inadequate collapse of cavitation bubbles(forming a shield),and the low utilization rate of the system for the ultrasonic energy. So when the

ultrasonic intensity continue to increase, the corresponding increment of the removal ratio decreases to some extent.

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2樓2012-09-27 20:53:55