本文選題：生物炭 + 松針　； 參考：《江蘇大學(xué)》2017年碩士論文

【摘要】：隨著經(jīng)濟(jì)的發(fā)展,水污染問題日漸加劇,目前對(duì)于去除水中污染物應(yīng)用最廣泛的是光催化降解法。在廣泛應(yīng)用的光催化材料中,BiOCl穩(wěn)定性較好且無毒,具有特殊的層級(jí)結(jié)構(gòu)和電子特性,在治理環(huán)境中染料廢水污染具有較好的應(yīng)用價(jià)值。但是BiOCl的禁帶寬度較大,不能在可見光下被激發(fā),易團(tuán)聚分散性差等缺點(diǎn)。因此需要對(duì)其進(jìn)行進(jìn)一步的改性研究。在眾多的改性方法中,與電子受體材料相耦合是比較常見的方法,生物炭就是近年來研究較熱的電子受體材料,具有良好的電子傳導(dǎo)性,可提高電子空穴對(duì)的分離效率。同時(shí),由于其豐富的孔隙結(jié)構(gòu)及較大的比表面積,在催化劑載體方面也被廣泛研究,因此,將生物炭與BiOCl相結(jié)合應(yīng)用于光催化領(lǐng)域中將有重要的應(yīng)用前景。本文基于BiOCl/C催化材料進(jìn)行了改性修飾,具體研究如下:首先,將松針進(jìn)行預(yù)處理后通過管式爐煅燒制備成松針生物炭,經(jīng)鹽酸處理后用甲苯對(duì)其進(jìn)行表面改性制成改性松針生物炭。然后以甲醇為溶劑,用溶劑熱法制備花狀BiOCl,再與改性松針生物炭通過管式爐煅燒進(jìn)行復(fù)合,得到BiOCl/C二元復(fù)合材料,通過調(diào)整BiOCl與C的質(zhì)量比來確定光催化降解效率最好的BiOCl/C復(fù)合材料。通過SEM、TEM、PL等分析測(cè)試手段對(duì)BiOCl/C復(fù)合材料進(jìn)行分析研究,通過在紫外光下對(duì)RhB溶液進(jìn)行光降解實(shí)驗(yàn)得出結(jié)論,BiOCl與C的質(zhì)量比為3:4的BiOCl/C復(fù)合材料對(duì)RhB溶液展現(xiàn)出最佳的光降解效率,并通過機(jī)理實(shí)驗(yàn)提出了BiOCl/C復(fù)合材料降解RhB溶液的光降解機(jī)理。但由于其在可見光下的光催化降解效率不高,因此需要對(duì)其進(jìn)行進(jìn)一步改性研究。其次,通過在紫外光下光催化還原制備了Ag/BiOCl復(fù)合光催化劑,然后通過管式爐煅燒制備了Ag/BiOCl/C三元復(fù)合光催化劑。其中Ag:BiOCl:C的質(zhì)量比為0.75:3:4時(shí)的復(fù)合光催化劑在光催化降解實(shí)驗(yàn)中顯示出了最好的光催化降解活性。同樣通過SEM、TEM以及電化學(xué)測(cè)試等分析測(cè)試手段對(duì)Ag/BiOCl/C三元復(fù)合材料進(jìn)行分析研究,并通過機(jī)理探討實(shí)驗(yàn)提出了Ag/BiOCl/C對(duì)RhB溶液的光降解機(jī)理。該復(fù)合光催化劑利用了貴金屬Ag的表面等離子體共振效應(yīng),Ag作為電子供體,BiOCl作為電子傳輸媒介,而生物炭作為電子受體,提升了在光降解過程中光生電荷載流子的分離效率,提高了Ag/BiOCl/C的光催化性能。最后,先合成出AgCl/BiOCl異質(zhì)結(jié)復(fù)合光催化材料,然后在紫外光下進(jìn)行部分還原后得到Ag/AgCl/BiOCl復(fù)合光催化劑,再通過管式爐煅燒即可得到Ag/AgCl/BiOCl/C四元復(fù)合光催化劑。在可見光照射條件下,通過Ag/AgCl/BiOCl/C對(duì)RhB溶液進(jìn)行光降解的實(shí)驗(yàn)得出結(jié)論,Ag/AgCl/BiOCl/C(S3)樣品展現(xiàn)出了最好的降解活性。在進(jìn)行了SEM、XRD、TEM、XPS、EDS、PL、DRS、電化學(xué)測(cè)試等表征及機(jī)理探討實(shí)驗(yàn)后,提出了光催化降解過程的機(jī)理。該光催化劑中AgCl與BiOCl之間形成了異質(zhì)結(jié),當(dāng)有可見光存在時(shí),利用貴金屬Ag的表面等離子體共振效應(yīng)作為電子供體,產(chǎn)生的激發(fā)態(tài)電子通過AgCl和BiOCl轉(zhuǎn)移到作為電子受體的導(dǎo)體的生物炭上,加強(qiáng)了光生電荷載流子的分離。這一系列的作用使該復(fù)合光催化劑在可見光區(qū)的光響應(yīng)范圍得到了進(jìn)一步的擴(kuò)展,進(jìn)一步提高了對(duì)太陽光譜中可見光的利用。
[Abstract]:With the development of the economy, the problem of water pollution is becoming more and more serious. At present, photocatalytic degradation is the most widely used to remove pollutants in water. In the widely used photocatalytic materials, BiOCl has good stability and non-toxic. It has special hierarchical structure and electronic characteristics. It has a good application value in the treatment of dye wastewater pollution in the environment. However, the band gap of BiOCl is large and can not be excited in visible light, and it is easy to reunite with poor dispersion. Therefore, it needs to be further modified. In many modification methods, the coupling of electron acceptor materials is a common method. Biological carbon is a hot electron acceptor material in recent years, and it is good. The electronic conductivity can improve the separation efficiency of the electron hole pair. At the same time, because of its rich pore structure and large specific surface area, it is also widely studied in the catalyst carrier. Therefore, the application of biological carbon and BiOCl in the field of photocatalysis will have important prospects. In this paper, the BiOCl/C catalyst has been modified. First, the pine needle bio carbon was prepared by calcining the pine needle through a tube furnace, and the modified pine needle biological charcoal was made by the surface modification of toluene after treatment by hydrochloric acid. Then the flower like BiOCl was prepared by the solvent heat of methanol, and then burned with the modified pine needle bio carbon through the tube furnace. The BiOCl/C two element composite was obtained. The BiOCl/C composites with the best photocatalytic degradation efficiency were determined by adjusting the mass ratio of BiOCl to C. The BiOCl/C composites were analyzed by SEM, TEM, PL and other analytical methods. The results of the RhB solution under ultraviolet light were obtained, and the quality of BiOCl and C was obtained. The best photodegradation efficiency of RhB solution was shown to RhB solution than the BiOCl/C composite of 3:4. The mechanism of photocatalytic degradation of RhB solution by BiOCl/C composites was proposed through the mechanism experiment. However, the photocatalytic degradation efficiency under visible light was not high. Ag/BiOCl composite photocatalyst was prepared by chemical reduction, and then Ag/BiOCl/C three element composite photocatalyst was prepared by calcining tube furnace. The best photocatalytic degradation activity of Ag:BiOCl:C was shown in the photocatalytic degradation experiment when the mass ratio of 0.75:3:4 was 0.75:3:4. The same sample was analyzed by SEM, TEM and electrochemical testing. The Ag/BiOCl/C three element composite was analyzed by means of testing, and the mechanism of photodegradation of RhB solution by Ag/BiOCl/C was proposed through the mechanism. The composite photocatalyst made use of the surface plasmon resonance effect of precious metal Ag, Ag as an electron donor, BiOCl as a transmission medium, and biological carbon as an electron acceptor. The separation efficiency of photogenerated charge carrier was raised during the photodegradation process, and the photocatalytic performance of Ag/BiOCl/C was improved. Finally, AgCl/BiOCl heterojunction composite photocatalyst was synthesized first, then the Ag/AgCl/BiOCl composite photocatalyst was obtained after partial reduction under UV light, and then Ag/AgCl/BiOCl/C four yuan could be obtained by calcining the tube furnace. Under the condition of visible light irradiation, the results of the photodegradation of RhB solution by Ag/AgCl/BiOCl/C showed that the Ag/AgCl/BiOCl/C (S3) samples showed the best degradation activity. After the characterization and mechanism of SEM, XRD, TEM, XPS, EDS, PL, DRS, electrochemical testing and other experiments, the photocatalytic degradation process was proposed. A heterojunction is formed between AgCl and BiOCl in the photocatalyst. When the visible light exists, the surface plasmon resonance effect of the precious metal Ag is used as an electron donor. The excited electrons generated by AgCl and BiOCl are transferred to the biological carbon as the conductor of the electron acceptor. The separation of the light generated charge carrier is strengthened. The action of the column further expands the light response range of the composite photocatalyst in the visible light region, and further improves the use of visible light in the solar spectrum.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O643.36

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本文編號(hào)：2060119