Research Institute of Biotechnology and Medical Converged Science, Dongguk University-Seoul, Ilsandong-gu, Goyang-si, Gyeonggi-do, 10326, Republic of Korea.
Department of Environmental Science and Engineering, Ewha Womans University, 11-1 Daehyun-Dong, Seodaemun-Gu, Seoul, 120-750, South Korea.
Chemosphere. 2021 Oct;281:130777. doi: 10.1016/j.chemosphere.2021.130777. Epub 2021 May 11.
The worldwide consumption of eggs is very high, leading to about 250,000 tons of eggshell membrane (ESM) waste annually. The present research thus investigated the potential use of ESM as an inexpensive and abundant adsorbent for Reactive Red 120 (RR120) in aqueous solutions, a widespread hydrophilic azo dye used in the textile industry. The chemical structure and morphology of ESM were characterized using various spectroscopic methods, including scanning electron microscopy, Fourier transform infrared spectroscopy, and elemental analysis. It was found that natural ESM has a porous structure and surface functional groups that are suitable for the adsorption of the target molecules. The impact of the operating conditions, including the variation in the pH and temperature, on the RR120 sorption capacity and mechanisms of ESM was also analyzed. The maximum monolayer adsorption ability of ESM for RR120 was found to be 191.5 mg/g at 318 K, and the sorption process was spontaneous and endothermic. The adsorption of RR120 onto ESM was significantly influenced by the solution pH and the use of NaOH as eluent, indicating that the driving force for this adsorption was electrostatic attraction. Subsequent desorption experiments using 0.1 M NaOH resulted in satisfactory recovery efficiency. Kinetic, isothermic, and thermodynamic analysis was also conducted to support the experimental findings. The experimental results for the adsorption kinetics of ESM were fitted by a pseudo-second-order model. In conclusion, ESM has the potential to be utilized as an eco-friendly and cost-effective adsorbent for the removal of RR120 from aqueous solutions.
全世界的鸡蛋消耗量非常高，导致每年产生约 25 万吨的鸡蛋壳膜（ESM）废物。因此，本研究调查了 ESM 作为一种廉价且丰富的吸附剂，用于从水溶液中去除活性红 120（RR120）的潜力，RR120 是一种广泛用于纺织工业的亲水性偶氮染料。ESM 的化学结构和形态使用各种光谱方法进行了表征，包括扫描电子显微镜、傅里叶变换红外光谱和元素分析。结果表明，天然 ESM 具有多孔结构和表面官能团，适合于目标分子的吸附。还分析了操作条件（包括 pH 和温度的变化）对 RR120 吸附容量和 ESM 吸附机制的影响。发现 ESM 对 RR120 的最大单层吸附能力为 318 K 时的 191.5 mg/g，吸附过程是自发和吸热的。RR120 在 ESM 上的吸附受到溶液 pH 和使用 NaOH 作为洗脱剂的显著影响，表明这种吸附的驱动力是静电吸引。随后使用 0.1 M NaOH 进行的解吸实验导致了令人满意的回收效率。还进行了动力学、等温线和热力学分析以支持实验结果。ESM 的吸附动力学实验结果通过准二级模型拟合。总之，ESM 具有作为一种环保且经济有效的吸附剂，用于从水溶液中去除 RR120 的潜力。
