- 學位論文
利用硫酸銅法製備鹼式碳酸銅之研究
A Study on the Preparation of Basic Cupric Carbonate by Copper Sulfate Method
摘要
鉻化砷酸銅（Chromated Copper Arsenate，CCA）是用量最大的木材防腐劑，其中所含的砷為嚴重的環境污染物，因此禁用CCA是極為重要的。以鹼式碳酸銅（Basic Cupric Carbonate）作為新一代木材防腐劑，其代替CCA可帶來驚人的環保意義，同時也具有廣闊的市場前景。 本研究使用硫酸銅法製備鹼式碳酸銅。首先配置不同濃度的硫酸水溶液，在固定反應的溫度及攪拌速率的情況下，加入等量的銅粉使其反應成硫酸銅溶液，每隔一段時間取出溶液分析含銅量，用來繪製溶解度曲線。 接著製備不同莫耳比例之H2SO4/NaClO3溶液，再加入不同濃度的Na2CO3與NH4HCO3，控制反應溫度為70 ℃，在此條件下製備出xCuCO3•yCu(OH)2。目的為製備出青綠色的CuCO3•Cu(OH)2，找出最佳之操作條件以求得最佳產率及最大產量，再用SEM觀察及用AA及XRD分析，發現H2SO4/NaClO3的當量濃度比為3：1，碳酸鈉當量濃度為1N，碳酸氫銨的當量濃度為0.42N，為最佳之操作條件。
並列摘要
Chromated Copper Arsenate is the amount used biggest wood preservatives, contains arsenic for serious environment pollutant, therefore is forbid CCA is extremely important. By Basic Cupric Carbonate took the new generation of wood preservatives, it replaces CCA to be possible to bring the astonishing environmental protection significance, simultaneously also has the broad market prospect. This research used copper sulfate method to prepare basic cupric carbonate. Firstly, we prepared a solution of sulfuric acid in different concentration, fixed the reaction temperature and rate of stir. In this condition, the reaction to produced copper sulfate solution from added equivalent copper powder. We took some solution to analyze the concentration of Cu2+ for each moment, in order to plot the solubility curve. We prepared the solution of Na2CO3/NaHCO3 in different molar ratio, and added different concentration of Na2CO3 and NH4HCO3, controlled reaction temperature in 70 ℃. In the above condition, we can prepare xCuCO3•yCu(OH)2. Our objective in this experiment was prepare dark green CuCO3•Cu(OH)2. We try to find out the optimum operation condition to get the optimum yield and maximum quantity. Finally, the sample can be observed and analyzed by SEM, AA and XRD, respectively. We find H2SO4/NaClO3 the equivalent ratio is 3: 1, the Na2CO3 equivalent is 1N, the NH4HCO3 equivalent is 0.42N, for best operating condition.