本文選題：孔雀石綠 + 三維電解　； 參考：《青島科技大學》2015年碩士論文

【摘要】：三苯甲烷類染料是目前市場上一種應用十分廣泛的一類染料；此類染料具有相當復雜的結構,同時也是一種有毒物質(zhì),對人類和環(huán)境的危害極大。染料在其生產(chǎn)、運輸、使用等各個過程中都會產(chǎn)生大量廢棄物和廢水。三苯甲烷類染料廢水的色度極大,COD很高,降解難度大,嚴重危害環(huán)境和人類健康。鑒于這種現(xiàn)狀,本論文以一種典型的三苯甲烷類染料孔雀石綠為實驗對象,采用三維電極反應器,以DAS電極為陽極,石墨板為陰極,活性炭為粒子電極,對其進行降解實驗。由于活性炭具有吸附性,在每次實驗前活性炭都要用待降解廢水進行飽和,以避免其對三維電解效果的影響。本研究考察了電解過程中整個體系的pH值、外加電場的電壓、電解質(zhì)的種類以及濃度、曝氣量、電解時間等各因素對降解實驗影響。并通過正交試驗探尋降解實驗的最合適的反應條件和參數(shù)。從實驗結果可以看出,考察的各個參數(shù)對試驗的影響程度從大到小的順序依次為：電解時間體系pH值電極電壓電解質(zhì)濃度曝氣量。結合實驗結果和運行成本來考慮,本實驗最后選定的電解條件為：外加電場的電極電壓為8v,初始pH值為6,曝氣量為0,電解質(zhì)Na2SO4濃度為0.1 mol/L,電解時間為120 mmin,在此反應條件下得到的孔雀石綠的最終降解率為92%,COD的最終降解率達到86%。本論文還研究了在電解過程的機理和其他參數(shù)。通過測定電解反應器中的電場分布和氧化還原電位可得知,隨著反應的進行,越靠近陽極氧化位置的還原電位會升高,而靠近陰極的位置氧化還原電位則會逐漸下降。通過縮小取樣時間間隔,增加取樣次數(shù),測定樣品的孔雀石綠(Malachite Green,簡稱MG)濃度和COD濃度,紫外可見掃描對電解溶液進行分析,初步探尋降解反應的機理和動力學公式。粒子電極一直是三維電極法的關鍵點之一,也是目前研究者正在攻克的難點之一�；钚蕴款w粒由于其良好的導電性和吸附性被廣大研究者青睞,但是也正因為其良好的導電性導致實驗過程中短路電流和旁路電流較大,而有效電流就相對總電流非常小,導致電流效率過低,造成電力資源的浪費。因此,為了提高電流效率,研究者更多情況下會往活性炭中摻入石英砂顆粒,這種顆粒不導電,能在一定程度上減小短路電流。由于兩種顆粒的粒徑和密度都不一樣,因此在電解過程中會出現(xiàn)兩種材料分層的現(xiàn)象。本實驗選擇在活性炭顆粒上負載其他物質(zhì),包括金屬氧化物,導電高分子材料和不導電的高分子物質(zhì),來考察其電解效果。結果顯示,隨著不導電顆粒的加入,同樣電解條件下,電流減小,電流效率也明顯提高,孔雀石綠和COD的降解率都達到了70%以上,其中以負載絕緣材料PTFE的活性炭的電流效率最佳。
[Abstract]:Triphenylmethane dyes are widely used in the market at present. These dyes have a very complex structure and are also a kind of toxic substances, which do great harm to human beings and the environment. A large amount of waste and wastewater will be produced in the production, transportation and use of dyes. Triphenylmethane dyestuff wastewater has a great chrominance and high COD, which is difficult to degrade, and seriously endangers the environment and human health. In view of this situation, a typical triphenylmethane dye malachite green was used as the experimental object in this paper. A three-dimensional electrode reactor was used, with DAS electrode as anode, graphite plate as cathode, activated carbon as particle electrode, and its degradation experiment was carried out. Because the activated carbon is adsorptive, the activated carbon must be saturated with the wastewater to be degraded before each experiment to avoid its influence on the effect of three-dimensional electrolysis. The effects of pH value of the whole system, voltage of applied electric field, type and concentration of electrolyte, aeration rate and electrolytic time on the degradation experiment were investigated. The optimum reaction conditions and parameters of the degradation experiment were investigated by orthogonal test. It can be seen from the experimental results that the order of influence of each parameter on the test is as follows: electrolytic time system pH value electrode voltage electrolyte concentration aeration. Considering the results of the experiment and the running cost, The electrolysis conditions are as follows: the electrode voltage of applied electric field is 8 v, the initial pH is 6, the aeration is 0, the concentration of electrolyte Na2SO4 is 0.1 mol / L, and the electrolysis time is 120mmin. under these conditions, the final drop of malachite green is obtained. The final degradation rate of COD was 86%. The mechanism and other parameters of electrolysis process are also studied in this paper. By measuring the electric field distribution and the redox potential in the electrolysis reactor, it can be seen that the reduction potential near the anodic oxidation position will increase with the reaction, but the redox potential near the cathode will decrease gradually. By reducing the sampling time interval and increasing the sampling times, the concentration of malachite Malachite Green (MGG) and the concentration of COD were determined. The electrolysis solution was analyzed by UV-Vis scanning, and the mechanism and kinetic formula of degradation reaction were preliminarily explored. Particle electrode is always one of the key points of three-dimensional electrode method, and it is also one of the difficulties that researchers are trying to solve. Activated carbon particles are favored by many researchers because of their good conductivity and adsorbability, but it is also due to their good conductivity that the short-circuit current and bypass current are larger in the experimental process, while the effective current is very small relative to the total current. The current efficiency is too low, resulting in the waste of power resources. Therefore, in order to improve the current efficiency, the researchers often add quartz sand particles to the activated carbon, which is non-conductive and can reduce the short-circuit current to a certain extent. Because the particle size and density of the two kinds of particles are different, there are two kinds of material delamination in the electrolysis process. In this experiment, the electrolysis effect of activated carbon particles was investigated by loading other substances, including metal oxide, conductive polymer material and non-conductive polymer material. The results show that with the addition of non-conductive particles, the current decreases and the current efficiency increases obviously under the same electrolysis conditions. The degradation rates of malachite green and COD are over 70%. The active carbon loaded with the insulating material PTFE has the best current efficiency.
【學位授予單位】：青島科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X788

【參考文獻】

相關碩士學位論文 前1條

1 曹志斌;三維電極反應器的設計及應用研究[D];南京航空航天大學;2009年

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本文編號：1909643