本文關(guān)鍵詞： 微波輔助超聲合成法 納米三氧化鉬 制備 復(fù)合 光催化　出處：《廣西大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著全球工業(yè)化進(jìn)程的發(fā)展,廢水排放量居高不下,如何合理高效的處理廢水已引起社會的廣泛關(guān)注。利用光催化降解處理廢水是目前最有效的解決辦法之一。三氧化鉬(MoO_3)因具有比表面積大以及電子沿軸傳輸?shù)忍攸c(diǎn)現(xiàn)已成為光催化領(lǐng)域的新興研究對象,但由于MoO_3的禁帶寬度較大,致使其光催化降解能力有限。氧化石墨烯(GO)具有比表面能高、親水性好以及能夠有效改善材料的光催化性能等特點(diǎn)。為了提高M(jìn)oO_3的光催化降解性能,本論文采用傳統(tǒng)沉淀法以及微波輔助超聲合成法制備一維納米MoO_3,并通過添加GO來改善MoO_3的光催化降解性能。在用兩種不同方法制備MoO_3的過程中分別考察了硝酸添加量、反應(yīng)溫度、反應(yīng)時(shí)間等工藝參數(shù)。通過XRD、TEM、DRS等表征手段比較了不同制備方法所得MoO_3在形貌,結(jié)構(gòu)以及光催化性能等方面的差異。結(jié)果如下:(1)采用沉淀法制備MoO_3,在VHNO_3:VH_2O=4:1,反應(yīng)溫度70℃,反應(yīng)時(shí)間1.5 h時(shí),可以制備出光催化性能較好的h-MoO_3,其對羅丹明B的降解率可達(dá)到94.2%。(2)采用微波輔助超聲合成法制備MoO_3,在超聲功率400 W,微波功率75W,VHNO_3:VH_2O=1:1,反應(yīng)溫度90℃,反應(yīng)時(shí)間1.5h時(shí),可制備出光催化性能較好的的α-MoO_3,其對羅丹明B的降解率可達(dá)96%。通過對上述兩種方法的比較,選用微波輔助超聲合成法原位合成GO@MoO_3,工藝條件與該法合成制備α-MoO_3 一致,在石墨烯添加量為5%,復(fù)合時(shí)間為3.5 h的條件下,可制備出光催化性能良好的GO@MoO_3復(fù)合產(chǎn)物。通過XRD、TEM、DRS等表征GO@MoO_3的形貌,結(jié)構(gòu),其對羅丹明B的降解率可達(dá)100%。
[Abstract]:With the development of the global industrialization process, the discharge of wastewater remains high. How to treat wastewater reasonably and efficiently has aroused widespread concern in society. Photocatalytic degradation of wastewater is one of the most effective solutions at present. Because of its large specific surface area and electron transmission along the axis, it has become a new research object in the field of photocatalysis. However, the photocatalytic degradation ability of MoO_3 is limited because of its wide band gap. The graphene oxide (GOO) has high surface energy. In order to improve the photocatalytic degradation of MoO_3, the hydrophilic properties and photocatalytic properties of the materials can be improved effectively. In this thesis, one-dimensional nano-scale MoO_3 was prepared by traditional precipitation method and microwave-assisted ultrasonic synthesis method. The photocatalytic degradation of MoO_3 was improved by adding go. The amount of nitric acid and the reaction temperature were investigated during the preparation of MoO_3 by two different methods. The morphologies of MoO_3 obtained by different preparation methods were compared by means of XRDX Tem DRS and other process parameters such as reaction time. The differences in structure and photocatalytic properties are as follows: 1) Moo _ s _ 3 was prepared by precipitation method, and the reaction temperature was 70 鈩，

本文編號：1484022