本文選題：氰化物去除　切入點：納米晶粒　出處：《Transactions of Nonferrous Metals Society of China》2017年06期

【摘要】：合成了ZnO、NiO和ZnO@NiO納米晶粒,采用紅外光譜(FTIR)、X射線衍射(XRD)和掃描電鏡(SEM)技術(shù)對其進行表征。ZnO、NiO和ZnO@NiO的平均顆粒尺寸為32、50和48 nm。對這些納米晶粒去除氰化物的能力進行了測定。實驗結(jié)果表明,與ZnO和NiO相比較,ZnO@NiO納米晶粒去除氰化物的能力更強。ZnO@NiO納米晶粒對氰化鐵的去除能力比對氰化鈉的更高。研究了反應(yīng)時間、溶液pH值(2~12)、納米晶粒用量(0.02~0.4 g)和氰化物濃度(5~50 mg/L)等參數(shù)對氰化物去除效果的影響。在最優(yōu)條件下:pH5,納米晶粒用量0.2 g,反應(yīng)時間30 min,ZnO@NiO納米晶粒對20 mg/L氰化物的去除率可達到90%以上。ZnO@NiO納米晶粒對氰化物的吸附去除動力學(xué)影響規(guī)律符合Langmuir準(zhǔn)二級吸附動力學(xué)模型(k2=4.66×10-2,R=0.999)。熱力學(xué)研究表明,25°C下,反應(yīng)的標(biāo)準(zhǔn)焓變化為7.87 kJ/mol,自由能變化為-18.62 kJ/mol。納米晶粒對氰化物的吸附是一個吸熱的自發(fā)過程。ZnO@NiO納米晶粒是一種能有效的去除水或廢水中氰化物的吸附劑。
[Abstract]:ZnO nio and ZnO@NiO nanocrystals were synthesized and characterized by FTIR and SEM techniques. The average particle sizes of ZnO@NiO and ZnONiO were 32 ~ 50 and 48 nm respectively.The ability of these nanocrystals to remove cyanide was measured.The experimental results show that ZnO- @ nio nanocrystalline is more capable of removing cyanide than that of ZnO and NiO. The removal capacity of ferric cyanide by ZnO- @ nil nanoparticles is higher than that of sodium cyanide.The effects of reaction time, pH value of solution, amount of nanocrystalline (0.02g) and concentration of cyanide (50 mg / L) on the removal of cyanide were studied.鍦ㄦ渶浼樻潯浠朵笅:pH5,綰崇背鏅剁矑鐢ㄩ噺0.2 g,鍙嶅簲鏃墮棿30 min,ZnO@NiO綰崇背鏅剁矑瀵，

本文編號：1710470