本文選題：鐵基非晶合金 + 多孔結(jié)構(gòu)��； 參考：《長(zhǎng)春工業(yè)大學(xué)》2017年碩士論文

【摘要】：近幾年來(lái),由于具有獨(dú)特的性能以及優(yōu)異的催化性能,鐵基非晶合金受到廣泛關(guān)注,部分鐵基非晶合金被發(fā)現(xiàn)能作為零價(jià)鐵對(duì)工業(yè)廢水進(jìn)行快速降解。盡管目前研究尚處于初始階段,涉及鐵基非晶合金的降解性能的眾多問(wèn)題還不清楚,但其展示出的優(yōu)異的污水降解性能對(duì)工程應(yīng)用具有很大吸引力,因此開(kāi)展相關(guān)研究具有重要科學(xué)意義和實(shí)用價(jià)值。本研究以Fe-Si-B系三元非晶合金為基礎(chǔ),系統(tǒng)地研究了鐵基非晶合金表面多孔結(jié)構(gòu)的制備工藝,以及具有多孔結(jié)構(gòu)的典型鐵基非晶合金催化苯酚廢水降解反應(yīng)的動(dòng)力學(xué)過(guò)程和催化反應(yīng)機(jī)理。本研究采用去合金化法,通過(guò)選擇不同的腐蝕溶液,并控制反應(yīng)時(shí)間、反應(yīng)溫度、溶液濃度及超聲波輔助頻率,來(lái)調(diào)控多孔結(jié)構(gòu)的制備工藝。最終,成功在Fe-Si-B系三元非晶合金表面制備出孔徑尺寸在30~150nm范圍內(nèi)的均勻多孔結(jié)構(gòu)。經(jīng)研究發(fā)現(xiàn),與相同成分的非晶合金條帶相比,具有多孔結(jié)構(gòu)的Fe-Si-B三元非晶合金在苯酚溶液的降解過(guò)程中,表現(xiàn)出更低的降解反應(yīng)活化能和更高的降解速率。通過(guò)改變實(shí)驗(yàn)參數(shù),得出納米多孔Fe_(76)Si_(7.2)B_(9.6)P_(7.2)非晶催化劑降解50mL、濃度為1g/L苯酚的最優(yōu)實(shí)驗(yàn)條件,當(dāng)反應(yīng)溫度為50℃,溶液初始pH值為4,加入催化劑濃度及雙氧水濃度分別為4g/L及0.3mol/L,反應(yīng)30min后,苯酚的完全降解效率達(dá)到95%以上。在相同實(shí)驗(yàn)條件下,分析表明,Fe-Si-B三元非晶合金對(duì)苯酚溶液降解機(jī)理與晶態(tài)材料相同,具有多孔結(jié)構(gòu)的Fe-Si-B三元非晶合金所具有的高的降解性能一方面是由于非晶態(tài)結(jié)構(gòu)相對(duì)于晶態(tài)具備更高活性;另一方面是由于多孔結(jié)構(gòu)的存在促進(jìn)了物質(zhì)交換,從而提高了降解速率。同時(shí)研究發(fā)現(xiàn),具有多孔結(jié)構(gòu)的Fe-Si-B非晶合金條帶具有良好的重復(fù)利用性能,具有優(yōu)異的應(yīng)用前景。
[Abstract]:In recent years, due to their unique properties and excellent catalytic properties, Fe-based amorphous alloys have attracted wide attention. Some Fe-based amorphous alloys have been found to be able to rapidly degrade industrial wastewater as zero-valent iron. Although the current research is still in its initial stage and many problems related to the degradation properties of Fe-based amorphous alloys are not clear, its excellent wastewater degradation performance is attractive for engineering applications. Therefore, it is of great scientific significance and practical value to carry out relevant research. Based on the Fe-Si-B system ternary amorphous alloy, the preparation process of porous structure on the surface of Fe-base amorphous alloy was studied systematically. The kinetic process and mechanism of catalytic reaction of phenol wastewater catalyzed by typical Fe-based amorphous alloys with porous structure were also discussed. In this study, the preparation process of porous structure was controlled by selecting different corrosion solution, controlling reaction time, reaction temperature, solution concentration and ultrasonic assisted frequency by dealloying. Finally, the uniform porous structure with pore size in the range of 30~150nm was successfully prepared on the surface of Fe-Si-B ternary amorphous alloy. It is found that the Fe-Si-B ternary amorphous alloy with porous structure exhibits lower activation energy and higher degradation rate in the degradation of phenol solution than the amorphous alloy strip with the same composition. By changing the experimental parameters, it is obtained that the optimum experimental conditions for the degradation of 1g/L phenol on amorphous catalyst are as follows: the reaction temperature is 50 鈩，

本文編號(hào)：1871617