台東縣海端鄉利稻村向陽地區蘊藏豐富的絹雲母礦，可開採量達一千五百萬噸，是台灣地區最具經濟價值的工業礦物原料之ㄧ。向陽絹雲母礦經水洗後粒徑細於400號篩，礦物組成以絹雲母及葉蠟石為主，含少量的石英及高嶺石。本研究利用絹雲母水洗礦原樣及球磨4 hr、球磨48 hr樣為原料，添加Na2SiO3為礦化劑(濃度3 M)，反應溫度240 ℃、持溫12 hr之條件下進行水熱反應，探討水熱合成方沸石(analcime)之吸附能力與溶液濃度、溶液pH值、水熱反應產物之粒徑之關係。
吸附實驗係將方沸石置入含Pb2+、Cu2+及Ca2+離子之溶液中，進行吸附反應，利用原子吸收光譜儀分析吸附前後水溶液中Pb2+、Cu2+及Ca2+之含量，即可獲得方沸石對Pb2+、Cu2+及Ca2+之吸附量即去除率。根據試驗結果結論如下：
1. 以絹雲母原樣、球磨4 hr及球磨48 hr樣進行水熱反應，所得方沸石之粒徑與原料粒徑有正相關，即原料粒徑大者，所得方沸石粒徑亦較大。
2. 合成方沸石對於Pb2+、Cu2+、Ca2+皆具有吸附能力，且對此三種離子之吸附量無甚大差異，在溶液初始濃度為0.0001 M，固/液比1：100的條件下，合成方沸石對三者之去除率皆達80%以上。
3. 在固定的固/液比下進行吸附實驗，隨著溶液離子濃度的增加，方沸石對於金屬離子(Pb2+、Cu2+、Ca2+)之吸附量亦增加，但去除率隨濃度之增加而減少，這係由於方沸石重量固定時，可提供吸附離子之位址數為定值，溶液濃度高時，溶液中金屬離子數量遠大於方沸石中可吸附離子之位址數量，故去除率隨著溶液濃度之增加而降低。
4. 在相同溶液的濃度及固定溶液體積下，固體(方沸石)量越多，則吸附量及去除率越大，亦即固/液比越大，方沸石對金屬離子之吸附量及去除率越大，這是由於溶液濃度固定時，溶液中的金屬離子數目固定，隨著方沸石重量增加，方沸石所提供之交換位址亦增加，故對金屬離子的去除率及吸附量皆上升。
5. 在酸性溶液中，H+會與金屬離子競爭吸附在方沸石結構中之陽離子位址，因此不利於方沸石進行吸附，故在產成氫氧化物沉澱之pH值前，適量地提升溶液之pH值可以增加方沸石對離子之吸附量以及去除率。
6. 用過之方沸石以濃度0.01M之NaCl進行再生後，再生一次之方沸石在吸附量與去除率上與原方沸石近乎相同，再生三次及四次之方沸石對水中Pb離子的去除率仍有60％~70％，是可重複使用之吸附材。
7. 球磨後樣品所合成之方沸石，其離子吸附量並未優於原樣合成之方沸石，對於Pb2+及Ca2+之吸附，原樣合成之方沸石吸附能力均優於球磨樣品合成之方沸石，顯示方沸石粒徑對吸附性能無顯著影響。推測可能由於方沸石去除水中之Pb2+、Cu2+及Ca2+係以離子交換的方式，吸附量及去除率僅與方沸石中可供交換之陽離子數目相關，與粒徑無關。

A tremendous amount of sericite deposit is located in the northwest of Li-dao to Hsiang-yang, Hai-duan Borough, Taitung County. The sericite deposit is one of the most valuable industrial minerals in Taiwan. The particle size of wet-classified sericite powder is smaller than 400 mesh. The major mineral compositions are sericite and pyrophyllite, with a small amount of quartz and kaolinite. In this study, the sericite powders, including the original, the samples ball-milled for 4 and 48 hr, were used to synthesize analcime via hydrothermal reactions. The mineralizer was Na2SiO3. The reactions were carried out at 240°C and held for 12 hr. The adsorption experiments of Pb2+, Cu2+ and Ca2+ were performed to investigate the influences of ion concentration, solution pH, particle size of analcime. The following conclusions can be drawn.
1. The particle sizes of the three analcime products are proportional to their starting materials, i.e. smaller starting materials synthesize smaller analcime.
2. The synthesized analcime has indiscriminate adsorption capability to Pb2+, Cu2+ and Ca2+, e.g. in the tests of initial concentration of 0.0001 M, the S/L ratio of 1:100, the removal percentage of the three ions are all above 80%.
3. For fixed S/L ratio, with the increasing of ion concentrations, the adsorption amount of Pb2+, Cu2+ and Ca2+ also increases. However, the removal percentage decreases. This is reasonable, because the total adsorption sites are fixed for a fixed amount of analcime. When the ion concentration increases, the total number of ions exceeds the total number of sites, eventually reduces the removal percentage.
4. For fixed ion concentration and solution volume, with the increasing the amount of analcime (S/L ratio), both the adsorption amount and removal percentage increase. This is due to that the total number of ions in solution is constant, therefore increasing the solid is equivalent to increasing the adsorption sites.
5. In the acid solution, H+ will compete against metal ions in the adsorption on analcime, thus is disadvantageous to the adsorption. It is found that at the pH, when the first hydroxy complex ion (MOH+) is formed, both adsorption amount and removal percentage can be increased.
6.Used analcime can be regenerated with 0.01M NaCl solution. The adsorption capability of first recycled analcime is almost unchanged. For Pb2+ ion, the removal percentage is still as high as 60~70% after recycled for 4 times.
7.The adsorption capability of analcime samples synthesized from ball-milled sericite, do not present specifically better performance than that from the not-ground sericite. For Pb2+ and Ca2+ ions, the adsorption of analcime from not-ground sericite even is better than the other two. This shows that the particle size of analcime has no influence on the adsorption capability. It is thus reasonably to assume that the removal of Pb2+, Cu2+ and Ca2+ by analcime is via the mechanism of ion exchange. The adsorption amount and removal percentage are related to the total number of adsorption sites, not the particle size (i.e. surface area).

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