本文選題：2 + 4-二氯酚��； 參考：《福建師范大學(xué)》2015年碩士論文

【摘要】：以2,4-二氯酚(2,4-DCP)為印跡分子,羧甲基纖維素鈉(CMC)或海藻酸鈉(SA)為功能單體制備了 2,4-DCP印跡膜,通過平衡吸附試驗、滲透平衡實驗,研究了功能單體種類、光照條件、聚乙烯醇(PVA)的添加量、CMC與2,4-DCP質(zhì)量比、交聯(lián)洗脫順序等因素對2,4-DCP印跡膜的吸附性能和滲透性能的影響,確定了印跡膜制備的最佳方法和條件參數(shù)。當(dāng)CMC:2,4-DCP質(zhì)量比為90:4,CMC:PVA質(zhì)量比為3:2,在避光條件下風(fēng)干,先交聯(lián)后洗脫可制得性能最佳的2,4-DCP印跡膜。在30mg/L的2,4-DCP溶液中,吸附2h左右達(dá)到平衡,吸附量可達(dá)0.375mg/g,滲透實驗在3h左右達(dá)到平衡,滲透量可達(dá)0.86mg/dm2,對該印跡膜進(jìn)行動力學(xué)分析,結(jié)果顯示,印跡膜對2,4-DCP的吸附過程符合準(zhǔn)二級動力學(xué)方程。以Ti網(wǎng)作為基體材料,用電沉積法制備了 Pd/Ti載鈀催化電極,通過SEM觀察表明,Pd/Ti電極表面負(fù)載有小顆粒的鈀,用XRD表征了制備的電極,說明Ti網(wǎng)上有Pd存在。基于修飾電極具有較強(qiáng)的電催化性能,以制備的Pd/Ti電極作為陰極,以CMC-PVA/CS-PVA雙極膜作為隔膜,對2,4-DCP溶液進(jìn)行處理,考察了不同電極、不同硫酸濃度、不同2,4-DCP初始濃度對2,4-DCP去除率的影響。結(jié)果表明,與空白Ti電極相比,Pd/Ti電極因具有更多的催化位點,電解時槽電壓較未修飾的Ti網(wǎng)電極小,對2,4-DCP具有更強(qiáng)的去除能力,在硫酸濃度≥0.25M時,硫酸濃度與2，4-DCP初始濃度對2,4-DCP的去除率影響不大,電解200min后,2,4-DCP的去除率可達(dá)90%左右。在制備的Pd/Ti電極表面采用流延法制備印跡膜復(fù)合雙極膜,以復(fù)合的印跡膜-雙極膜作為電解槽隔膜,Pd/Ti網(wǎng)電極作為陰極,對2,4-DCP進(jìn)行去除實驗。探討了不同電極、不同膜、硫酸濃度、2,4-DCP初始濃度等因素對2,4-DCP去除率的影響。結(jié)果顯示,復(fù)合的印跡膜-雙極膜與雙極膜相比能夠更有效地提高2，4-DCP的去除速度,縮短去除時間。當(dāng)硫酸濃度較低時,硫酸濃度的提高有利于2，4-DCP的去除;當(dāng)硫酸濃度達(dá)到0.5 M時,硫酸濃度的增加對2,4-DCP的去除率基本不產(chǎn)生較大的影響。2,4-DCP初始濃度越高,初始降解速度越快,降解量越多,但2,4-DCP初始濃度對其去除率影響不大,均可達(dá)到80%-90%。實驗表明,印跡膜結(jié)合雙極膜技術(shù)處理2,4-DCP溶液,可提高電極表面2,4-DCP的濃度,提高其去除速度,縮短去除時間,是去除溶液中2,4-DCP的有效方法。
[Abstract]:The imprinted membrane was prepared by using 2O4-DCP as imprinted molecule and sodium carboxymethyl cellulose (CMC) or sodium alginate (SA) as functional monomer. The species and illumination conditions of functional monomers were studied by equilibrium adsorption test and osmotic equilibrium experiment. The effects of the addition amount of PVA and the mass ratio of CMC to 2n4-DCP, the sequence of cross-linking and elution on the adsorption and permeability of the imprinted membrane were investigated. The optimum preparation method and conditions of the membrane were determined. When the mass ratio of CMC _ 2 to CD _ 4-DCP is 90: 4 and the mass ratio of CMC _ (1) to PVA is 3: 2, the best 2C4-DCP imprinted membrane can be prepared by air-drying, first crosslinking and then eluting under the condition of avoiding light. In 30 mg / L 2nd-DCP solution, the adsorption reached equilibrium for 2 hours, the adsorption capacity reached 0.375 mg / g, and the osmotic experiment reached equilibrium at about 3 h, and the osmotic capacity reached 0.86 mg / dm2.The kinetic analysis of the imprinted membrane showed that, The adsorption process of 2O4-DCP by imprinted membrane accords with the quasi second order kinetic equation. PD / Ti supported palladium catalytic electrode was prepared by electrodeposition with Ti mesh as substrate. SEM observation showed that there were small particles of palladium on the surface of PD / Ti electrode. The prepared electrode was characterized by XRD, indicating that PD exists on Ti network. Based on the strong electrocatalytic performance of the modified electrode, the prepared PD / Ti electrode was used as cathode and CMC-PVA / CS-PVA bipolar membrane was used as the diaphragm to treat 24-DCP solution. The different electrode and different sulfuric acid concentration were investigated. The effect of different initial concentration of 2O4-DCP on the removal rate of 2O4-DCP. The results show that compared with the blank Ti electrode, the PD / Ti electrode has more catalytic sites, and the electrolytic cell voltage is smaller than that of the unmodified Ti grid electrode, and it has a stronger removal capacity to 24-DCP. When the sulfuric acid concentration is 鈮，

本文編號：2091498