Journal of Nuclear Agricultural Sciences ›› 2021, Vol. 35 ›› Issue (5): 1231-1242.DOI: 10.11869/j.issn.100-8551.2021.05.1231

• Isotope Tracer Technique·Ecology and Environment·Physiology • Previous Articles     Next Articles

Adsorption and Mechanism Analysis of Malachite Green Adsorption by Spent Lentinus edodes Substrate Based Biochar Prepared at Different Pyrolysis Temperatures

ZHANG Haibo, SU Long, CHENG Hongyan*, ZHANG Guosheng, HE Xiaofang   

  1. College of Resources and Environment, Shanxi Agricultural University, Taigu, Shanxi 030801
  • Received:2020-08-21 Revised:2020-11-26 Online:2021-05-10 Published:2021-03-16

不同热解温度制备的香菇菌糠生物炭对孔雀石绿的吸附及其机理分析

张海波, 苏龙, 程红艳*, 张国胜, 何小芳   

  1. 山西农业大学资源环境学院,山西 太谷 030801
  • 通讯作者: *程红艳,女,教授,主要从事固废资源化利用及土壤重金属污染修复研究。E-mail:ndchenghy@163.com
  • 作者简介:张海波,男,讲师,主要从事固废资源化利用研究。E-mail:haiboz666@163.com
  • 基金资助:
    山西省高校黄土高原食用菌提质增效协同创新中心平台项目,山西省自然科学基金资助项目(201901D111216),山西省高等学校科技创新项目(2020L0137),山西农业大学科技创新基金项目(2018YJ39)

Abstract: The biochar (LSBC) prepared from spent Lentinus edodes substrate spent Lentinus edodes substrate at different pyrolysis temperatures (350℃ and 750℃) was used to study the internal relationship between their physicochemical characteristics and malachite green (MG) adsorption performance. The influence of pyrolysis temperatures on the physicochemical properties and the dye adsorption capacity of the biochar were studied, and the mechanism was investigated by means of scanning electron microscope (SEM), X-ray diffractometer (XRD) and Fourier transform infrared spectroscopy (FTIR). The results showed that the specific surface area, the aromatization degree, and the calcium oxalate (calcium carbonate) components of adsorbent increased with the increase of pyrolysis temperature, and these properties were the key factors for the differential adsorption capacities. The batch adsorption experiments showed that the adsorption process of malachite green by spent Lentinus edodes substrate and LSBC was in accordance with the First order kinetic model and Redlich-Peterson model. The maximum adsorption capacity of spent Lentinus edodes substrate, LS350 and LS750 calculated by Langmuir model was 6 785.65, 6 986.74 and 13 118.43 mg·g-1, respectively, LS750 showed the best adsorption performance. The adsorption mechanisms showed that the adsorption process mainly referred to hydrogen bonding, π-π conjugation, electrostatic attraction, and cation exchange. The biochar prepared from spent Lentinus edodes substrate showed high adsorption performance to malachite green and can be resued, which provide theoretical basis and practical support for the application of spent mushroom substrate based biochar in the field of printing and dyeing wastewater treatment.

Key words: spent Lentinus edodes substrate, biochar, pyrolysis temperatures, malachite green, adsorption mechanism

摘要: 为探讨菌糠原料及其所制备生物炭的理化性质与其对染料孔雀石绿吸附性能之间的内在关系,以香菇菌糠为原料,在不同热解温度下(350℃和750℃)制备菌糠生物炭(LS350和LS550),研究热解温度对生物炭理化性质与染料吸附性能的影响,并利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)和傅里叶变换红外光谱(FTIR)技术对吸附前后的菌糠和菌糠生物炭进行表征,探究其吸附机理。结果表明,随热解温度的升高,吸附剂比表面积增大,芳香化增强,草酸钙(碳酸钙)组分增多,这些理化性质是引起生物炭吸附性能差异的重要原因;批量吸附试验表明,香菇菌糠和菌糠生物炭对孔雀石绿的吸附过程符合准一级动力学模型与Redlich-Peterson模型。由Langmuir模型计算得到香菇菌糖、LS350和LS750的最大吸附量分别为6 785.65、6 986.74和13 118.43 mg·g-1,LS750的吸附量最高。吸附机理表明,香菇菌糠和菌糠生物炭对孔雀石绿的吸附过程主要包括氢键作用、π-π共轭作用、静电引力、阳离子交换等机制。以香菇菌糠为原料制备的生物炭对阳离子染料孔雀石绿具有高效吸附性能,且可重复利用,可为菌糠生物炭应用于印染废水处理提供理论依据和实践支撑。

关键词: 香菇菌糠, 生物炭, 热解温度, 孔雀石绿, 吸附机理