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頁籤選單縮合
題名 | 茶渣去除鎘、鎳、鉛及鋅的研究=Romoval of Cd, Ni, Pb and Zn by Tea Bagasses |
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作者 | 梁致遠; 林鴻淇; | 書刊名 | 中華生質能源學會會誌 |
卷期 | 16:1/2 民86.06 |
頁次 | 頁40-46 |
分類號 | 434.81、434.81 |
關鍵詞 | 茶渣; 福馬林; 重金屬; Tea bagasse; Formaldehyde; Heavy metal; |
語文 | 中文(Chinese) |
中文摘要 | 茶葉經沖泡後所剩餘的茶渣作為吸附重金屬的材料。茶渣經烘乾磨粹,在稀硫酸中 使用福馬林處理,經處理後的茶渣,網狀結構明顯,網孔多且大,網孔是鎘、鎳、鉛及鋅離 子的良好吸附區域,網孔愈多則吸附重金屬的位置愈多。綠茶、烏龍茶及紅茶在製作過程中 多酚類氧化的程度不同,因此經醛類縮合後的綠茶茶渣、烏龍茶茶渣及紅茶茶渣,形成對重 金屬吸附能力的不同。根據 Langmuir 等溫吸附曲線計算重金屬的最大吸附量,經處理後的 綠茶茶渣與活性碳對鎘、鉛、鎳及鋅的吸附量相似,但低於經處理後的烏龍茶茶渣與紅茶茶 渣。 試驗分析鉗合劑對經處理後的茶渣去除重金屬的效應,加入 8- �G�u酚及 1,10- 二氮 菲時,對鉛的吸附不產生影響。加入 EDTA 及 CyDTA,則會抑制處理後的茶渣對重金屬的吸 附,但此時處理後的茶渣仍可吸附 50 %以上添加於溶液中的鎘、鎳、鉛及鋅。 |
英文摘要 | The residues of scalded, i.e., the tea bagasses, are able to used as good sorbents for heavy metals. The tea bagasses were treated with formaldehyde in a dilute sulfuric acid. The porous structures of treated tea bagasses are clear, large and numerous and that the pores serve as good sorbents for Cd, Ni, Pb and Zn ions. Thus, with increasing porous structures of tea bagasses increase the active sites of adsorbing groups for heavy metals. The adsorption of heavy metals of the aldehyde treated green tea, oolong tea and black tea bagasses are different and that is caused by the different oxidation of polyphenol in the manufacture. The maximum adsorption of heavy metals was evaluated by the Langmuir equation. The maximum adsorption of Cd, Ni, Pb and Zn of treated green tea bagasse is less than the treated oolong tea and black tea bagasses but is good as activated carbon. Effects of CyDTA, EDTA, 8-hydroxyquinoline and 1,10-phenanthroline on the adsorption of Cd, Ni, Pb and Zn ions were examined. The adsorption of Pb is not changed by addition of 8-hydroxyquinoline and 1,10-phenanthroline. On the other hand, adsorption of Cd, Ni, Pb and Zn were reduced by addition of CyDTA and EDTA. However, it still remains more than 50% of Cd, Ni, Pb and Zn ions from aqua solution. |
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