Biochar Prepared from Steam-Exploded Bitter Melon Vine for the Adsorption of Methylene Blue from Aqueous Solution: Kinetics, Isotherm, Thermodynamics and Mechanism

文献类型： 外文期刊

第一作者： Li, Xia

作者： Li, Xia;Jiang, Lihua;Zhang, Bo;Zhang, Zihui;Chen, Yan;Jia, Hongyu;Jiang, Lihua;Mou, Zhengwei

作者机构：

关键词： bitter melon vine; steam explosion; biochar; adsorption mechanism

期刊名称：SUSTAINABILITY （ 影响因子：3.3； 五年影响因子：3.6 ）

ISSN：

年卷期： 2024 年 16 卷 17 期

页码：

收录情况： SCI

摘要： Bitter melon vine (an agricultural waste product with high fiber content) is difficult to treat and has caused problems in the environment. This research aims to produce biochar through low-temperature pyrolysis assisted by non-polluting steam explosion. The physical and chemical properties of the biochar were characterized using scanning electron microscopy (SEM) images, specific surface area measurements (BET), X-ray diffraction patters (XRD), elemental analysis (EA), and Fourier transform infrared spectroscopy (FTIR). Next, the adsorption mechanism of methylene blue (MB) on the steam-exploded bitter melon vine biochar pyrolyzed at 200 degrees C (qBC200) and the effects of adsorption time, pH, initial concentration, adsorption temperature, and adsorbent dosage on the adsorption effect were investigated. Steam explosion destroyed the dense structure of the plant, increased the number of oxygen-containing surface functional groups, and improved the adsorption performance of the material. Therefore, qBC200 more effectively adsorbed MB than untreated biochar, reaching a saturated adsorption capacity of 267.72 mg/g. The MB adsorption kinetics and isothermal adsorption process of qBC200 align with the pseudo-second-order kinetic model and Langmuir isothermal equation (monolayer adsorption), respectively. The thermodynamic results show that MB adsorbs via a spontaneous, entropy-increasing exothermic reaction. The adsorption mechanism involves electrostatic attraction, hydrogen bonding, and pi-pi interactions. The prepared biomass with high fiber content is a promising new material for wastewater treatment.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序