發(fā)布時間：2019-01-16 00:56

【摘要】：生物錳氧化物是具有錳氧化活性的微生物將環(huán)境中低價態(tài)Mn氧化為高價態(tài)Mn而形成的。近年來,生物錳氧化物由于其優(yōu)良的吸附性與強氧化性能而被廣泛應用到重金屬污染修復以及環(huán)境中有害有機物的降解等領域。本研究利用從土壤中分離到的一株具有高錳氧化活性的野生菌株Pseudomonas sp.T34所產(chǎn)生一種生物錳氧化物BMO,用于吸附電鍍廢水中的Ni(II)以及降解喹酮類抗生素環(huán)丙沙星。以期為電鍍廢水所帶來的的重金屬污染和由于抗生素的濫用所帶來環(huán)境問題,提供一個可能的解決途徑。在含鎳電鍍廢水的吸附實驗中,首先通過一系列條件的優(yōu)化,得出了生物錳氧化物BMO吸附電鍍廢水最適條件為:溫度為50℃,pH為4,轉(zhuǎn)速為200r/min,電鍍廢水Ni(II)濃度為10 mg L-1。在最適條件下對整個吸附過程進行吸附動力學分析發(fā)現(xiàn)其比較符合二級吸附動力力學特征。朗繆爾等溫線方程擬合的結(jié)果顯示,生物錳氧化物BMO對電鍍廢水Ni(II)的最大吸附通量可達359.71 mg g-1,并且在整個過程中吸附十分迅速,20 min左右便能達到平衡。通過XRD,XPS,FTIR等表征分析手段分析并比較了BMO在吸附電鍍廢水前后表征的變化。在5個循環(huán)解吸附實驗中,生物錳氧化物BMO對電鍍廢水的吸附能力仍能保持80%左右的吸附率。在環(huán)丙沙星的降解方面,通過單因素影響實驗,得到生物錳氧化物BMO降解環(huán)丙沙星的最適條件為:45℃,pH為6,環(huán)丙沙星初始濃度為1μg mL-1。金屬離子的影響實驗表明,其對環(huán)丙沙星的降解具有抑制作用。通過對環(huán)丙沙星降解產(chǎn)物LC-MS的分析,對其進行了初步的鑒定,并通過參考相關文獻提出了一個可能的環(huán)丙沙星降解途徑。降解產(chǎn)物的生測實驗證明生物錳氧化物BMO可以顯著降低環(huán)丙沙星對菌體的毒性。4個循環(huán)的降解實驗顯示其對環(huán)丙沙星的降解率均能保持在90%以上。最后在自然水體下的降解模擬實驗表明了生物錳氧化物BMO在降解真實環(huán)境中有害有機物的可能性。
[Abstract]:Biomanganese oxides are formed by oxidizing low Mn to high valence Mn by microorganisms with manganese oxidation activity. In recent years, Biomanganese oxides have been widely used in heavy metal pollution remediation and degradation of harmful organic matter due to their excellent adsorption and strong oxidation properties. In this study, a biological manganese oxide (BMO,) was produced from a wild strain, Pseudomonas sp.T34, which was isolated from soil and was used to adsorb Ni (II) in electroplating wastewater and to degrade ciprofloxacin, a quinone antibiotic. In order to provide a possible solution for the heavy metal pollution caused by electroplating wastewater and the environmental problems caused by the abuse of antibiotics. In the adsorption experiment of electroplating wastewater containing nickel, through a series of optimization conditions, the optimum conditions for adsorption of electroplating wastewater with biological manganese oxide BMO were obtained as follows: temperature 50 鈩，

本文編號：2409286