(1. 內(nèi)蒙古科技大學(xué) 能源與環(huán)境學(xué)院，包頭 014010；
2. 華中科技大學(xué) 環(huán)境科學(xué)與工程學(xué)院，武漢 430074)
摘 要: 本文采用KHCO3活化制備多孔活性炭(Porous activated carbon, PAC)，然后用水熱法制備磁性多孔活性炭/鐵酸鈣復(fù)合材料(PAC/CF)，考察其對水溶液中釷(Ⅳ)的吸附特性，并通過掃描電鏡、比表面積分析儀、X射線衍射、傅里葉變換紅外光譜、振動樣品磁強(qiáng)計和Zeta電位等手段對復(fù)合材料進(jìn)行表征，驗證其合成的可靠性及磁分離性能，揭示其吸附機(jī)制。結(jié)果表明：PAC與磁性鐵酸鈣(Calcium ferrite, CF)成功復(fù)合并能有效吸附廢水中的釷(Ⅳ)。在pH=4.0、投加量為0.4 g/L、吸附時間為50 min的最佳條件下，PAC/CF對釷(Ⅳ)的吸附量可達(dá)129.8 mg/g。PAC/CF對釷(Ⅳ)的吸附動力學(xué)符合準(zhǔn)二級模型，吸附等溫線符合Langmuir模型，熱力學(xué)參數(shù)表明吸附反應(yīng)是自發(fā)吸熱的。PAC/CF對釷(Ⅳ)的吸附機(jī)理為靜電吸附、離子交換和配位反應(yīng)，pH和離子強(qiáng)度對PAC/CF吸附釷(Ⅳ)的影響較為顯著，PAC/CF可再生得以循環(huán)利用。
關(guān)鍵字: 多孔活性炭；鐵酸鈣；磁性復(fù)合材料；釷(IV)；吸附
（1. School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China;
2. School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China）
Abstract:In this study, KHCO3 was used as the activator to prepare porous activated carbon (PAC), then the magnetic porous activated carbon/calcium ferrite composite (PAC/CF) was prepared by hydrothermal method. The adsorption characteristics of PAC/CF on thorium(Ⅳ) in aqueous solution were investigated by scanning electron microscopy, specific surface area analyzer, X-ray diffraction, Fourier transform infrared spectroscopy, vibrating sample magnetometer and Zeta potential. And that verified the reliability and magnetic separation performance of the synthesized PAC/CF and revealed its adsorption mechanism. The results show that PAC and calcium ferrite (CF) are successfully combined and can effectively adsorb thorium(Ⅳ) in wastewater. The adsorption capacity of PAC/CF for thorium(Ⅳ) can reach 129.8 mg/g under the optimal conditions of pH=4.0, dosage of 0.4 g/L and adsorption time of 50 min. The adsorption kinetics of thorium(Ⅳ) by PAC/CF conforms to the quasi-second-order model, the adsorption isotherm conforms to the Langmuir model and the thermodynamic parameters indicate that the adsorption reaction is spontaneous endothermic. The adsorption mechanism of PAC/CF to thorium(Ⅳ) is electrostatic adsorption, ion exchange and coordination reaction. The effects of pH and ionic strength on the adsorption of thorium(Ⅳ) by PAC/CF are more significant, and PAC/CF can be regenerated and recycled.
Key words: porous activated carbon; CaFe2O4; magnetic composite material; Th(Ⅳ); adsorption
