本文選題：丁基黃藥 + 光催化　； 參考：《吉林大學(xué)》2017年碩士論文

【摘要】：隨著工業(yè)的發(fā)展,礦山開(kāi)采的規(guī)模逐漸擴(kuò)大,浮選藥劑的使用量隨之增加,浮選廢水中有高毒、高污染性的藥劑殘留量也逐漸增大,導(dǎo)致礦區(qū)生態(tài)環(huán)境不斷惡化。黃藥是最常用的和最為有效的硫化礦捕收劑,所以研究黃藥的處理方法對(duì)礦區(qū)環(huán)境保護(hù)具有積極意義。光催化氧化法在有機(jī)廢水處理方面具有較好的處理效果,研究備受關(guān)注,然而光催化劑存在難重復(fù)再利用和易流失等問(wèn)題,限制了其實(shí)際應(yīng)用。磁性復(fù)合光催化劑因引入了磁性物質(zhì),使其既具有磁性又有光催化活性,在應(yīng)用時(shí)便于與反應(yīng)體系分離,能提高重復(fù)利用率,降低處理廢水的成本,因此具有良好的應(yīng)用前景。本論文以制備新型磁性光催化劑,解決光催化劑難以回收的問(wèn)題以及光催化反應(yīng)器中的實(shí)際應(yīng)用為研究目的,制備了MgFe_2O_4/Bi_2WO_6和MgFe_2O_4/Bi_2MoO_6磁性復(fù)合光催化劑,對(duì)其進(jìn)行了丁基黃藥的光催化效果研究,并將制備的MgFe_2O_4/Bi_2WO_6應(yīng)用于改進(jìn)的磁性固定膜式的光催化反應(yīng)器中,主要內(nèi)容及結(jié)果如下:(1)通過(guò)水熱法成功制備了花狀MgFe_2O_4/Bi_2WO_6,其中摻雜比例為10 wt%MgFe_2O_4/Bi_2WO_6的光降解效果最好,說(shuō)明適量的摻雜MgFe_2O_4能改善Bi_2WO_6的光催化活性;并考察了光催化劑投加量、丁基黃藥的初始濃度和p H值對(duì)光催化降解效果的影響,結(jié)果表明光催化劑投加量和丁基黃藥初始濃度對(duì)光降解影響較大,p H值的影響較小;當(dāng)丁基黃藥的初始濃度為50 mg/L,光催化劑投加量為0.5 g/L時(shí),經(jīng)過(guò)120 min光照,丁基黃藥的降解率能達(dá)到96%,并對(duì)其進(jìn)行重復(fù)使用實(shí)驗(yàn),重復(fù)使用5次后對(duì)丁基黃藥的降解率仍有92%,說(shuō)明MgFe_2O_4/Bi_2WO_6具有較好的穩(wěn)定性,能回收再利用。(2)通過(guò)水熱法成功制備了MgFe_2O_4/Bi_2MoO_6,結(jié)果表明摻雜比例為10 wt%MgFe_2O_4/Bi_2MoO_6的光降解效果最好,說(shuō)明適量的摻雜MgFe_2O_4能改善Bi_2MoO_6的光催化活性;當(dāng)丁基黃藥的初始濃度為50 mg/L,光催化劑投加量為0.2 g/L時(shí),經(jīng)過(guò)120 min光照,丁基黃藥的降解率能達(dá)到80%以上,并考察了光催化劑投加量、丁基黃藥的初始濃度和p H對(duì)光催化降解效果的影響,結(jié)果表明光催化劑投加量和丁基黃藥初始濃度對(duì)光降解影響較大,p H值的影響較小;并對(duì)其進(jìn)行重復(fù)使用實(shí)驗(yàn),發(fā)現(xiàn)重復(fù)使用5次后對(duì)丁基黃藥的降解率仍有80%,說(shuō)明MgFe_2O_4/Bi_2MoO_6具有較好的穩(wěn)定性,能回收再利用。(3)研究表明MgFe_2O_4/Bi_2WO_6的光催化性能好于MgFe_2O_4/Bi_2MoO_6,將MgFe_2O_4/Bi_2WO_6應(yīng)用在磁性固定膜式的光催化反應(yīng)器中,以丁基黃藥為目標(biāo)降解物,通過(guò)連續(xù)進(jìn)出水的方式分別考察水力停留時(shí)間、光源強(qiáng)度和丁基黃藥初始濃度對(duì)反應(yīng)器光催化效果的影響;結(jié)果表明水力停留時(shí)間對(duì)丁基黃藥的降解效果影響最大。該反應(yīng)器對(duì)丁基黃藥有較好的降解效果,當(dāng)丁基黃藥的初始濃度為50 mg/L,水力停留時(shí)間為49 min,光源強(qiáng)度為2.2×105 lux時(shí),對(duì)丁基黃藥的降解率能達(dá)到98%。
[Abstract]:With the development of industry, the scale of mining is gradually expanding, the use of flotation reagents is increasing, flotation wastewater has high toxicity, and the residue of high pollution chemicals is gradually increasing, which leads to the deterioration of ecological environment in mining areas. Xanthate is the most commonly used and most effective sulphide collector, so it is of great significance to study the treatment of xanthate for environmental protection of mining area. Photocatalytic oxidation has a good effect on the treatment of organic wastewater, and has attracted much attention. However, the photocatalyst is difficult to reuse and easy to run off, which limits its practical application. Magnetic composite photocatalyst has good application prospect because of its magnetic material and photocatalytic activity, which can be easily separated from the reaction system in application, and can improve the reuse efficiency and reduce the cost of wastewater treatment. In order to prepare new magnetic photocatalyst, solve the problem of difficult recovery of photocatalyst and practical application in photocatalytic reactor, the magnetic composite photocatalyst of MgFe_2O_4/Bi_2WO_6 and MgFe_2O_4/Bi_2MoO_6 was prepared in this paper. The photocatalytic effect of Ding Ji xanthate was studied, and the MgFe_2O_4/Bi_2WO_6 was applied to the improved magnetic fixed film photocatalytic reactor. The main contents and results are as follows: (1) Flower MgFe _ 2O _ 2O _ 4 / T _ 2W _ 6 was successfully prepared by hydrothermal method, among which the photodegradation effect of 10 wt%MgFe_2O_4/Bi_2WO_6 doped MgFe_2O_4 was the best, indicating that the appropriate amount of doped MgFe_2O_4 could improve the photocatalytic activity of Bi_2WO_6, and the dosage of photocatalyst was investigated. The effect of initial concentration and pH value of Ding Ji xanthate on photocatalytic degradation was studied. The results showed that the dosage of photocatalyst and initial concentration of Ding Ji xanthate had little effect on photodegradation. When the initial concentration of Ding Ji xanthate is 50 mg / L and the amount of photocatalyst is 0.5 g / L, the degradation rate of Ding Ji xanthate can reach 96g / L after 120 min illumination, and the repeated use experiment is carried out. The degradation rate of Ding Ji xanthate is still 92% after repeated use for 5 times, indicating that MgFe_2O_4/Bi_2WO_6 has good stability and can be recovered and reused.) MgFe _ 2O _ 2O _ 4 / Bi2MoO _ 6 has been successfully prepared by hydrothermal method. The results show that the photodegradation effect is the best when the doping ratio is 10 wt%MgFe_2O_4/Bi_2MoO_6. When the initial concentration of Ding Ji xanthate is 50 mg / L and the dosage of photocatalyst is 0.2 g / L, the degradation rate of Ding Ji xanthate can reach more than 80% after 120 min illumination. The effects of the dosage of photocatalyst, the initial concentration of Ding Ji xanthate and pH on photocatalytic degradation were investigated. The results showed that the amount of photocatalyst and the initial concentration of Ding Ji xanthate had little effect on photodegradation. It was found that the degradation rate of Ding Ji xanthate was still 80% after repeated use for 5 times, which indicated that MgFe_2O_4/Bi_2MoO_6 had good stability. The study of recovery and reuse showed that the photocatalytic performance of MgFe_2O_4/Bi_2WO_6 was better than that of MgFe2O4 / Biti2MoO6.The MgFe_2O_4/Bi_2WO_6 was applied to the magnetic fixed membrane photocatalytic reactor, and the degradation of Ding Ji xanthate was taken as the target. The HRT was investigated by means of continuous water access. The effect of light source intensity and initial concentration of Ding Ji xanthate on the photocatalytic effect of the reactor was studied. The results showed that HRT had the greatest effect on the degradation of Ding Ji xanthate. When the initial concentration of Ding Ji xanthate is 50 mg / L, the HRT is 49 min and the intensity of light source is 2.2 脳 10 ~ 5 lux, the degradation rate of Ding Ji xanthate can reach 98%.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：X751;O643.36

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