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標題: | 營建廢棄物對銅離子吸附能力探討 Investigation of Copper Ion Adsorption onto Construction Waste |
作者: | Karen Tiong Jia Ling 張嘉凌 |
指導教授: | 呂良正(Liang-Jenq Leu) |
關鍵字: | 營建廢棄物,銅,吸附,脫附,遲滯現象, Construction waste,Copper,Adsorption,Desorption,Hysteresis, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 隨著都市蓬勃發展及新建工程持續增加,使得近年來營建廢棄物與工業副產品產生量呈現不斷上升的趨勢,造成環境污染與破壞。為了以最資源化方式處理此類廢棄物,本論文旨在探討廢紅磚(RB)、廢瓷磚(CT)及廢鑄砂(FS)作為低成本吸附劑對於水溶液中二價銅(Cu2+)離子之吸附能力;另外,亦進行脫附實驗加以探討各吸附劑吸附達飽和後之穩定性,藉此作為其可應用於透水性鋪面材料之佐證支持。 本研究利用批次吸附實驗分別探討RB、CT及FS於不同Cu2+溶液初始濃度和不同吸附劑質量下對其吸附效果之影響。實驗結果顯示各吸附劑對於Cu2+皆具有相當不錯之吸附能力,其排序為CT > FS > RB,且各吸附劑均同時符合Langmuir與Freundlich 等溫吸附模式,但以Langmuir等溫吸附方程式所擬合之結果較佳;RB、CT及FS之最大吸附量分別為68.49、88.50及81.97 (mg/g)。此外,於Freundlich 等溫吸附模式中,所有吸附劑之 值皆大於1,亦驗證此三種吸附劑有利於銅金屬吸附現象的發生。 依動力吸附模式探討結果指出RB、CT及FS均符合擬二階動力學模式,證明Cu2+與各吸附劑表面之官能基原子間發生電子的交换、轉移或共有,而形成化學键之化學吸附作用。另一方面,本研究將各吸附劑對Cu2+之吸附與脫附實驗結果利用Freundlich 等溫吸附方程式進行擬合,並計算其遲滯係數( ),結果顯示各吸附劑之反應皆具有遲滯現象發生,驗證其反應皆具有不可逆性;由此驗證RB、CT及FS於酸性環境下之銅金屬溶出度低,亦即其吸附達飽和後之穩定性佳,造成環境污染的問題相對減少。未來可針對其它不同試驗條件下或通過材料改質的處理方式作分析,加以探討於滲透性鋪面系統中採用RB、CT及FS作為更優異的低成本吸附劑來達到滲濾作用是必要的研究方向。 In recent years, the rapid urbanization of cities and the increasing demand for new constructions have created a rising trend in the amount of construction waste generation and industrial by-products, thereby causing environmental pollution and degradation. In order to examine the most effective handling methods of construction waste and industrial by-products, this study is conducted with an aim to investigate the adsorption capacity of waste red brick (RB), waste ceramic tile (CT) and waste foundry sand (FS) as low-cost adsorbents to treat copper (II) sulfate aqueous solution. In addition, desorption experiments were conducted to investigate the stability of the saturated adsorbents with adsorbed Cu2+ to provide supporting evidence for their applicability as permeable paving materials. In this study, a series of batch adsorption experiments were carried out to investigate the effects of initial concentration and dosage onto the tested adsorbents. The experimental results demonstrated that the tested adsorbents have comparatively high adsorption capacity for Cu2+ which decreased in sequence CT > FS > RB. The adsorption isotherm can be described by both Langmuir and Freundlich isotherm model, but the Langmuir model showed better fit with all the experimental data. The maximum adsorption capacity of RB, CT and FS were 68.49, 88.50 and 81.97 mg/g, respectively. Moreover, the empirical constant ( ), as defined by Freundlich model, was calculated and its value was greater than 1 for all the adsorbents. This result indicated that the tested adsorbents are conducive to the occurrence of copper metal adsorption. According to the kinetic adsorption models analysis, the rate of adsorption conformed to the pseudo-second order kinetic model and it proved the occurrence of electron exchange, electron transfer, or electron sharing between the Cu2+ and the functional group atoms on the surface of adsorbents. Such phenomenon indicated the formation of chemical bond and thus, showed the presence of chemisorption. Furthermore, the experimental results for both adsorption and desorption of each adsorbent fitted the Freundlich equation in obtaining the corresponding values, which were subsequently used to calculate the hysteresis index ( ). The results showed that the reaction of each adsorbent exhibits a phenomenon of hysteresis which signifies that the Cu2+ adsorption is irreversible. These consequences revealed that each of the saturated adsorbents performs high stability after the adsorption of Cu2+, indicating a low possibility of copper metal leaching and hence, minimizing environmental pollution. For future studies, it is recommended to examine different test conditions or material modifications, such as applying RB, CT and FS as better low-cost adsorbents into permeable paving system to achieve the purpose of infiltration. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/18165 |
DOI: | 10.6342/NTU202003244 |
全文授權: | 未授權 |
顯示於系所單位: | 土木工程學系 |
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