中药渣基活性炭的制备及其对头孢拉定的吸附研究

doi:10.3969/j.issn.1673-5854.2017.04.004

摘要/Abstract

摘要： 以香橼、桂枝和板蓝根3种中药渣为原料，Na₂CO₃为活化剂，800℃下活化1.5 h制备了香橼活性炭（AC-CM）、桂枝活性炭（AC-RC）和板蓝根活性炭（AC-IT）3种活性炭。采用扫描电镜、红外光谱、比表面积分析、pH值和pH_pzc测定等表征手段考察了活性炭的特性。研究了3种活性炭对头孢拉定的吸附动力学与吸附等温线，考察了不同初始pH值和NaCl质量浓度对吸附过程的影响。结果发现，AC-CM、AC-RC和AC-IT的比表面积分别为453.32、413.78和230.06 m²/g，pH值分别为9.70、8.23和9.24，pH_pzc值分别为9.28、9.21和9.38，活性炭表面主要含有C=O、C=C以及含N基团，SEM分析显示活性炭表面存在大量的孔结构。AC-CM、AC-RC和AC-IT对头孢拉定的吸附过程均符合伪二级动力学与粒内扩散模型，吸附速率受粒内扩散机制和化学吸附共同控制。Freundlich模型能较好地描述3种活性炭的等温吸附过程，n均大于1，说明吸附过程容易进行。溶液初始pH值对活性炭吸附影响较大，pH值为3（在100 mg/L头孢拉定溶液中，添加0.1 g活性炭，吸附48 h）时，AC-CM、AC-RC和AC-IT对头孢拉定的吸附量最大，分别达到74.76、79.44和62.55 mg/g。溶液中NaCl的存在也增加了活性炭的吸附量。

关键词: 中药渣, 碳酸钠, 活性炭, 头孢拉定, 吸附

Abstract: Citron activated carbon(AC-CM), cassia twig activated carbon(AC-RC) and isatis roots activated carbon(AC-IT) were prepared from the residues of citron(CM), cassia twig(RC) and isatis roots(IT) by Na₂CO₃ activation at 800℃ for 1.5 h. Scanning electron microscope (SEM), Fourier transform infrared (FT-IR) spectroscopy and Brunauer-Emmett-Teller(BET) measurements were used to characterize the activated carbons, and the pH value and pH_pzc of the activated carbons were also determined. Three kinetic and two isotherm models were applied to analyze the dynamic and isotherm experiment data of the adsorption of cefradine on the activated carbons, respectively. The effects of initial pH and NaCl mass concentration on the adsorption were also studied. The results indicated that the specific surface areas of AC-CM, AC-RC and AC-IT were 453.32, 413.78 and 230.06 m²/g, the corresponding pH values were 9.70, 8.23 and 9.24, and the pH_pzc values were 9.28, 9.21 and 9.38. The FT-IR spectra showed that the surface groups of the activated carbons were main C=O, C=C and nitrogen containing group, and the SEM images showed there were many pore structures. The pseudo-second order and intraparticle diffusion model fit the kinetics for the adsorption of cefradine on three activated carbons and the adsorption rate were controlled by intraparticle diffusion and chemisorption. The Freundlich isotherm model matched the isotherm experiment data more appropriate than Langmuir model and the n>1 showed that the adsorption process was easy to carry out. And the initial pH value of the solution had an obvious effect on adsorption process, the maximum cefradine adsorption quantities on AC-CM, AC-RC and AC-IT were 74.76, 79.44 and 62.55 mg/g, respectively, with the initial pH value 3, 100 mg/L cefradine solution, 0.1 g activated carbon and adsorption for 48 h. And the existence of NaCl in the solution increased the adsorption quantity of activated carbon.

Key words: Chinese medicine residue, sodium carbonate, activated carbon, cefradine, adsorption

中图分类号:

TQ35
TQ424

于颖, 孙显涛, 陈建秋, 明广奇, 商景阁. 中药渣基活性炭的制备及其对头孢拉定的吸附研究[J]. 生物质化学工程, 2017, 51(4): 25-32.

YU Ying, SUN Xiantao, CHEN Jianqiu, MING Guangqi, SHANG Jingge. Adsorption of Cefradine on Activated Carbon Prepared from Chinese Medicine Residue[J]. bce, 2017, 51(4): 25-32.

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