| 题名 | 碱性溶液中铅氧化物与多元醇相互作用的研究 |
| 作者 | 吴建国 |
| 学位类别 | 硕士 |
| 答辩日期 | 1985-06-30 |
| 授予单位 | 中国科学院研究生院 |
| 导师 | 柯家骏 |
| 中文摘要 | 本I作用红外光谱和X射线衍射分析的方法着重研究了PbO_2与多元醇（乙二醇、丙三醇、木（左米右广）醇和甘露醇）的氧化还原反应，发现无论在水溶液中还是在氢氧化钠碱溶液中，多元醇是被氧化成羧酸盐，而PbO_2本身则还原成二价铅。使用紫外分光光度法测定了Pb(II)与多元醇在氢氧化钠(0.1N)碱性溶液中能形成1:1络合物，并通过离了交换法检测出此络合物在碱性溶液中为带负电荷的阴络离子。在温度25 ℃和KNO_3介质条件下用pH－电位滴定法研究了在碱性溶液中此络合物的水解和中和反应，表明此络合物仅存在于强碱性溶液中，其稳定性按多元醇配位体乙二醇－丙三醇－甘露醇－木（左米右广）醇的顺序递增。实验测定数据表明，添加多元醇于碱性溶液中可以增大PbO的溶解速率和溶解量，随着多元醇分子内的羟基数目增加对PbO的溶解呈有利的。根据实验结果，对在氢氧化钠碱性溶液中PbO_2、Pb(II)是PbO与多元醇的反应机理初步推论如下：PbO_2 + HL + OH~- → RCOO~- + Pb(OH)_3~- Pb(OH)_3~- → [PbOL]~- + 2H_2O PbO + HL + OH~- → [PbOL]~- + H_2O式中HL表示各种多元醇，[PbOL]~-表示所形成的络合物，RCOO~-表示生成的羧酸根。 |
| 英文摘要 | The oxidation-reduction reactions of lead dioxide with various polyols (glycol, glycerol, xylitol and mannitol) were primarily studied by using IR spectroscopy and X-ray diffraction analysis. It was found that polyols were oxidized into the salts of carboxylic acids and lead dioxide was reduced into lead (II). It was determined by UV-spectrophotometric method that lead (II) reacted with polyols to form the complexes of combining ratio 1:1 in solution of sodium hydroxide (0.1 N), and it was also detected by an ion-exchange method that there exsited anionic complexes with a negative charge in alkaline solution. A pH-potentiometric titration method was used to investigate the reaction of hydrolysis and neutralization of the complexes in alkaline solution and KNO_3 medium at 25 ℃. The experimental results indicated that th complexes only exsited in strong basic solution and the stability of the complexes increases according to order of polyols' ligands, glycol-glycerol-mannitol-xylitol. It has been shown from the determined data that adding polyols into alkaline solution may increase the dissolution rate and the solubility of lead oxide, and the beneficial effects on solubility of lead oxide in alkaline solution of sodium hydroxide containing polyols were demonstrated with increase of hydroxyl number in polyols. On the bases of the results of these experiments, a reaction mechanism of lead dioxide, lead (II) and lead oxide with polyols in alkaline solution of sodium hydroxide has been deduced as follows: PbO_2 + HL + OH~- → RCOO~- + Pb(OH)_3~- Pb(OH)_3~- + HL → [PbOL]~- + 2H_2O PbO + HL + OH~- → [PbOL]~- + H_2O where HL is various polyols, [PbOL]~- is the complexes and RCOO~- is the carboxylic acid radical. |
| 语种 | 中文 |
| 公开日期 | 2013-09-27 |
| 页码 | 74 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/2069]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 吴建国. 碱性溶液中铅氧化物与多元醇相互作用的研究[D]. 中国科学院研究生院. 1985. |
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