發(fā)布時間：2018-10-30 16:29

【摘要】：隨著紡織行業(yè)的迅速發(fā)展,印染廢水引發(fā)的污染問題日益嚴重。廢水中的染料結構復雜且性質穩(wěn)定,難于自然降解,釋放到環(huán)境中將對公眾健康構成嚴重威脅。生物質炭富含多孔結構和表面官能團,常用于吸附去除污染物。相比于商品化的活性炭,生物質炭更廉價易得。本研究將討論生物質炭的吸附特性與活性炭之間的差別,并探討生物質炭用于廢水中染料污染去除的可行性。本文研究了杉木源生物質炭(BC)和商業(yè)活性炭(AC)對水溶液中孔雀石綠(MG)和酸性橙Ⅱ(AOⅡ)的吸附行為。采用平衡吸附法,通過一系列的試驗,考察在不同反應時間、振蕩強度、溫度、p H和鹽度等條件下,兩種不同的炭對模擬廢水中的陰陽離子型染料的吸附性能,并探討了其吸附機理。主要研究內容及結果如下:1.當pH值從3.0增加到9.0時,兩種炭對孔雀石綠的吸附量隨pH值增大而增加,而對酸性橙Ⅱ的吸附量均不同程度的降低;適當?shù)柠}濃度有利于生物質炭和活性炭對孔雀石綠和酸性橙Ⅱ的去除。振蕩強度對體系吸附影響不大。兩種吸附劑對孔雀石綠和酸性橙Ⅱ的吸附均較符合Langmuir和Freundlich吸附等溫式。在10-40℃范圍內,生物質炭對孔雀石綠和酸性橙Ⅱ的吸附量隨溫度升高而增加,活性炭對孔雀石綠和酸性橙Ⅱ的吸附量隨溫度升高而降低。2.吸附熱力學研究表明吸附生物質炭吸附孔雀石綠和酸性橙Ⅱ的活化焓△H0呈正,說明吸附是吸熱過程,吉布斯焓變△G0為負值可知,生物質炭對孔雀石綠和酸性橙Ⅱ的吸附是自發(fā)過程;而活性炭的活化焓△H0均小于0,吉布斯焓變△G0呈正值,說明活性炭對孔雀石綠和酸性橙Ⅱ的吸附是一個放熱的非自發(fā)過程。3.兩種吸附劑對孔雀石綠和酸性橙Ⅱ的吸附動力學過程均可分為快速和慢速兩個階段,其吸附過程均能用準二級反應動力學模型進行很好的描述。
[Abstract]:With the rapid development of textile industry, the pollution caused by printing and dyeing wastewater is becoming more and more serious. The structure of dyes in wastewater is complex and stable, and it is difficult to degrade naturally. The release of dyes into the environment will pose a serious threat to public health. Biomass carbon is rich in porous structure and surface functional groups, and is often used for adsorption and removal of pollutants. Biomass charcoal is cheaper and easier to obtain than commercial activated carbon. This study will discuss the difference between the adsorption characteristics of biomass carbon and activated carbon, and discuss the feasibility of using biomass carbon to remove dye pollution from wastewater. The adsorption of malachite green (MG) and acid orange 鈪，

本文編號：2300533