一种通过改性核桃壳制备的新型吸附剂用于去除阴离子染料：动力学和热力学研究。
A new absorbent by modifying walnut shell for the removal of anionic dye: kinetic and thermodynamic studies.
机构信息
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
College of Environment, Hohai University, Nanjing 210098, China.
出版信息
Bioresour Technol. 2014 Jul;163:199-205. doi: 10.1016/j.biortech.2014.04.046. Epub 2014 Apr 24.
A novel, low cost and easy regeneration biosorbent, chem-modified walnut shell (MWNS), was studied to investigate its potential for removal of an anionic dye, reactive brilliant red K-2BP. The MWNS was synthesized with epichlorohydrin and diethylenetriamine as etherifying agent and crosslinking agent, respectively, and its characteristics were performed with Fourier transform infrared spectroscopy, scanning electron microscope, electron dispersive spectroscopy and thermogravimetric analysis. The influences of pH (0.5-11) and adsorbent dosage (0.1-6g/L) on adsorption capacity of MWNS were evaluated. The maximum K-2BP adsorption capacities (Qm) calculated by best fitting model (Langmuir) were 568.18 mg/g at 313 K, which was almost 10 times than that of raw material. The adsorption kinetic was well confirmed with pseudo-second-order equation. Thermodynamic studies demonstrated adsorption process by MWNS was spontaneous and endothermic. Furthermore, the regeneration capability of MWNS implied MWNS was a cheap, excellent and promising biosorbent for K-2BP removal in azo dye wastewater treatment.
一种新型的、低成本且易于再生的生物吸附剂——化学改性的核桃壳（MWNS），被用于研究其对阴离子染料活性艳红 K-2BP 的去除潜力。MWNS 是用表氯醇和二乙烯三胺分别作为醚化剂和交联剂合成的，其特性通过傅里叶变换红外光谱、扫描电子显微镜、电子能谱和热重分析进行了研究。考察了 pH 值（0.5-11）和吸附剂用量（0.1-6g/L）对 MWNS 吸附容量的影响。最佳拟合模型（朗缪尔）计算的最大 K-2BP 吸附容量（Qm）在 313K 时为 568.18mg/g，几乎是原料的 10 倍。吸附动力学很好地符合准二级方程。热力学研究表明，MWNS 的吸附过程是自发和吸热的。此外，MWNS 的再生能力表明 MWNS 是一种廉价、优良且有前途的生物吸附剂，可用于处理偶氮染料废水中的 K-2BP。
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