本研究利用自然界常見且產量豐富的矽藻土對Sr2+進行除汙工程，本研究分為兩個階段，第一階段為天然矽藻土酸活化改質和矽藻土與赤鐵礦進行複合形成複合材料兩部分改質，酸活化改質方式藉由酸活化以增加比表面積，使用酸侵蝕矽藻土；矽藻土與赤鐵礦進行複合形成複合材，此為將赤鐵礦複合在矽藻土表面，增加奈米級赤鐵礦顆粒，除增加比表面積外，也可運用赤鐵礦之表面吸附位點，以利後續吸附實驗進行；在改變複合鐵初始濃度，以形成比表面積較大之複合材料，在提升比表面積下，以利於後續吸附實驗進行，第二階段進行對Sr2+的批次實驗，並且探討對Sr2+吸附機制。
本研究第一階段第一部分改質實驗結果顯示，酸活化改質，以1.0 M硫酸於75。C環境下以500 rpm轉速進行酸活化改質，將矽藻土中的物質進行溶解，將比表面積從41.20 m2/g提升至68.26 m2/g。由SEM觀察酸活化的樣品形貌改變不大，顆粒相較於原始矽藻土較為碎粒。第一階段第二部分改質實驗為複合材料，將原始矽藻土浸泡於0.02 M氯化鐵(FeCl3．6H2O)水溶液中，將樣品放置於100 。C烘箱中，實驗結果，比表面積從41.20 m2/g提升至84.40 m2/g，在改變複合初始鐵濃度，初始鐵濃度為0.10 M複合可以得到最佳比表面積為199.03 m2/g，由SEM觀察複合材料，在矽藻土表面生成奈米級顆粒，部分奈米級顆粒因矽藻土表面分佈不均勻，會產生團聚現象在矽藻土表面上。
本研究第二部分為批次實驗結果，原始矽藻土和改質後矽藻土對Sr2+吸附，皆符合Langmuir isotherm model，飽和吸附量(Qmax)分別為4.4 mg/g、5.1 mg/g、8.0 mg/g和18.5 mg/g。從吸附動力學實驗中顯示酸活化改質後矽藻土和矽藻土/赤鐵礦複合材料對Sr2+吸附皆符合為擬二階動力學吸附模式，K2分別為0.133 g/mg．min和0.081 g/mg．min。從變溫吸附實驗中得到酸活化改質後矽藻土和矽藻土/赤鐵礦複合材料對Sr2+吸附之熱力學常數ΔG和ΔH，ΔG分別皆為負值，ΔH分別為2.97 KJ/mol 和3.06 KJ/mol，從熱力學參數中顯示出酸活化改質後矽藻土和矽藻土/赤鐵礦複合材料對Sr2+吸附反應為自發吸熱反應。
本研究之結果顯示矽藻土是有潛力的吸附材料，經過簡易的處理，成為對於Sr2+之吸附劑，未來能運用於核廢料洩漏時，初步處理的素材，和未來進行核廢料的封存，具有待開發潛力的材料。

This study investigated Sr2+ removes used by diatomite. There are two methods to modify the diatomite. The diatomite was treated by acid (H2SO4) to increase its specific surface area and pore volume. Another method is the diatomite composite hematite form a composite material. The modified-diatomite was subjected to the batch experiment. It suggested that the Langmuir isotherm was more adequate than Freundlich isotherm in simulating the adsorption isotherm of Sr2+, The maximum adsorption capacity of modified-diatomite is 5.1 and 8.0 mg/g. Moreover, the adsorption thermodynamics confirmed that the Sr2+ adsorption onto the modified-diatomite was a spontaneous process.

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Urquieta-González,E.A., Martins,L., Peguin, R.P.S., Batista,M.S.,’ Identification of Extra-Framework Species on Fe/ZSM-5 and Cu/ZSM-5
Catalysts Typical Microporous Molecular Sieves with Zeolitic Structure’, Materials Research, 5(2002) 321-327
Urquieta-González,E.A., Martins,L., Peguin, R.P.S., Batista,M.S.,’ Identification of Extra-Framework Species on Fe/ZSM-5 and Cu/ZSM-5
Catalysts Typical Microporous Molecular Sieves with Zeolitic Structure’, Materials Research, 5(2002) 321-327
Urquieta-González,E.A., Martins,L., Peguin, R.P.S., Batista,M.S.,’ Identification of Extra-Framework Species on Fe/ZSM-5 and Cu/ZSM-5
Catalysts Typical Microporous Molecular Sieves with Zeolitic Structure’, Materials Research, 5(2002) 321-327
Urquieta-González,E.A., Martins,L., Peguin, R.P.S., Batista,M.S.,’ Identification of Extra-Framework Species on Fe/ZSM-5 and Cu/ZSM-5
Catalysts Typical Microporous Molecular Sieves with Zeolitic Structure’, Materials Research, 5(2002) 321-327
Urquieta-González,E.A., Martins,L., Peguin, R.P.S., Batista,M.S.,’ Identification of Extra-Framework Species on Fe/ZSM-5 and Cu/ZSM-5
Catalysts Typical Microporous Molecular Sieves with Zeolitic Structure’, Materials Research, 5(2002) 321-327
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Catalysts Typical Microporous Molecular Sieves with Zeolitic Structure’, Materials Research, 5(2002) 321-327

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