發(fā)布時間：2018-06-10 13:38

  本文選題：VOCs + 活性炭纖維��； 參考：《浙江工業(yè)大學(xué)》2015年碩士論文

【摘要】：揮發(fā)性有機化合物(VOCs)是已經(jīng)成為繼SO2和NOX后最受關(guān)注的大氣污染物,它與NOX、煙塵一起作用可形成光化學(xué)污染,是造成城市“霧霾”等復(fù)合型大氣污染物的主要原因。目前工業(yè)上往往采用高效、節(jié)能、操作簡單的吸附技術(shù)作為主要手段對其進(jìn)行治理。而活性炭作為工業(yè)應(yīng)用較多的吸附劑存在著疏水性差、易燃易爆、脫附困難等問題�；钚蕴坷w維作為新型的炭基吸附材料以其高比表面積、大孔容、豐富的微孔以及導(dǎo)電性在VOCs治理中得到了越來越多的應(yīng)用。首先本文選用三種活性炭纖維ACF1、ACF2、ACF3,系統(tǒng)考察了VOCs種類(甲苯、乙酸乙酯、丙酮、異丙醇)及甲苯濃度、床層溫度、不同濕度對三種活性炭纖維吸附VOCs性能的影響。結(jié)果表明,具有高比表面、大孔容的ACF2活性炭纖維其吸附容量最佳,甲苯飽和吸附容量可達(dá)到318.3mg/g。甲苯濃度對吸附推動力影響較大,在濃度為12000mg/m3下,可使吸附容量達(dá)到434.8mg/g�；钚蕴坷w維吸附甲苯受溫度影響較小,在60℃下仍然具有288.6mg/g的吸附容量。其次,動態(tài)吸附實驗測定303K、318K、333K溫度下,甲苯在活性炭纖維和活性炭二種吸附劑上的吸附平衡等溫線,通過模型擬合吸附等溫線,并計算吸附熱。實驗結(jié)果表明:①在低壓區(qū)二種吸附劑的吸附量都快速上升,這與其富含微孔有關(guān),同時在低溫(303K)高壓區(qū),活性炭纖維表現(xiàn)出更好的吸附效果;②利用Clansius-Clapeyron方程計算得到等量吸附熱數(shù)據(jù),活性炭纖維的等量吸附熱要低于活性炭的吸附熱,可有效防止吸附床層飛溫,更具安全性;③在不同溫度、不同濃度條件下,Yoon-Nelson模型對活性炭和活性炭纖維床層動態(tài)吸附穿透曲線均能很好擬合,模型參數(shù)能較好描述動態(tài)吸附過程,通過模型參數(shù)也能很好預(yù)測穿透曲線�；谒羝偕钚蕴坷w維存在熱傳遞速率慢,脫附時間長等問題,利用活性炭纖維自身的電阻,通過電流產(chǎn)生焦耳熱,從而使活性炭纖維升溫進(jìn)行再生,論文考察了不同電壓下電致熱再生活性炭纖維的性能。結(jié)果表明,電壓越大,活性炭纖維升溫速率越快,脫附效率越高,而且經(jīng)過100min即可完全脫附。同時經(jīng)過4次循環(huán),活性炭纖維仍然有較好的吸附效果,飽和吸附量依然能達(dá)到原有吸附量的80%以上。
[Abstract]:Volatile organic compounds (VOCs) have become the most concerned atmospheric pollutants after SO2 and NOX. They interact with NOX and soot to form photochemical pollution, which is the main cause of urban "smog" and other complex atmospheric pollutants. At present, the adsorption technology of high efficiency, energy saving and simple operation is used as the main means to treat it. However, activated carbon is widely used as an adsorbent with poor hydrophobicity, flammable and explosive properties, difficult desorption and so on. As a new carbon based adsorption material, activated carbon fiber (ACF) has been used more and more in VOCs treatment with its high specific surface area, large pore volume, rich micropore and electrical conductivity. The effects of VOCs (toluene, ethyl acetate, acetone, isopropanol), toluene concentration, bed temperature and humidity on the adsorption properties of three kinds of activated carbon fibers (ACF1 / ACF2 / ACF3) were investigated. The results show that the adsorption capacity of ACF2 activated carbon fiber with high specific surface and large pore volume is the best, and the saturated adsorption capacity of toluene can reach 318.3 mg / g. The concentration of toluene has a great influence on the driving force of adsorption. When the concentration of toluene is 12000mg/m3, the adsorption capacity can reach 434.8 mg / g. The adsorption of toluene by activated carbon fiber is less affected by temperature, and still has the adsorption capacity of 288.6mg/g at 60 鈩，

本文編號：2003406