Effect of carbonization methods on the properties of tea waste biochars and their application in tetracycline removal from aqueous solutions

IF 8.1 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Bin Li , Yin Zhang , Jin Xu , Yanglu Mei , Shisuo Fan , Huacheng Xu
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引用次数: 68

Abstract

The properties of biochars and their adsorption performance are highly dependent on the carbonation methods. In this study, five carbonation methods, namely, hydrothermal treatment (HT), direct carbonization (BC), carbonization of hydrochar (HBC), KHCO3 activation carbonation (KBC), and KHCO3 activation carbonation of hydrochar (KHBC), were adopted to prepare tea waste biochars. Adsorption behaviors and mechanisms toward tetracycline (TC) by biochar in the aquatic environment were investigated. The results showed that carbonation methods significantly influence the morphology, carbon structure, chemical composition, and functional groups of the biochars based on the characterization of surface area and pore volume analysis, Fourier Transform Infrared Spectroscopy, Raman spectrum, Scanning Electron Microscope, Transmission Electron Microscope, X-ray photoelectron spectroscopy, X-Ray Diffraction, and elemental analysis. Combination of hydrothermal treatment with KHCO3 activation can significantly increase the surface area and enlarge the pore structure of biochar (KHBC and KBC). The BET of KHCO3-activated BCs nearly increased 280 times (KHBC: 1350.80 m2 g−1; KBC: 1405.06 m2 g−1). BET, total pore volume and micropores volume of biochar has a positive influence on TC adsorption capacity. In addition, all adsorption processes can be well fitted by Langmuir and pseudo-second-order kinetic models. The maximum adsorption capacity of KHCO3-activated BCs nearly increased approximately 40 times (KHBC: 451.45 mg g−1; KBC: 425.17 mg g−1). The dominant mechanisms of biochar-adsorbed TC were pore-filling effect and π–π interactions, followed by hydrogen bonds and electrostatic interactions. Therefore, KHBC has the potential to act as sorbents for TC removal from aquatic environment.

炭化方法对茶渣生物炭性能的影响及其在四环素脱除中的应用
生物炭的性质及其吸附性能在很大程度上取决于炭化方法。本研究采用水热法(HT)、直接炭化法(BC)、烃类炭化法(HBC)、KHCO3活化炭化法(KBC)和KHCO3活化炭化法(KHBC)五种炭化方法制备茶渣生物炭。研究了生物炭在水生环境中对四环素的吸附行为及其机理。基于比表面积和孔体积、傅里叶变换红外光谱、拉曼光谱、扫描电镜、透射电镜、x射线光电子能谱、x射线衍射和元素分析等表征结果表明,炭化方法显著影响了生物炭的形貌、碳结构、化学成分和官能团。水热处理与KHCO3活化相结合,可显著增加生物炭(KHBC和KBC)的表面积,扩大其孔隙结构。khco3活化的bc的BET几乎增加了280倍(KHBC: 1350.80 m2 g−1;KBC: 1405.06 m2 g−1)。生物炭的总孔体积、微孔体积对TC吸附能力有正向影响。此外,所有吸附过程都可以用Langmuir和拟二级动力学模型很好地拟合。khco3活化的bc的最大吸附量几乎增加了约40倍(KHBC: 451.45 mg g−1;KBC: 425.17 mg g−1)。生物炭吸附TC的主要机理是孔填充效应和π -π相互作用,其次是氢键和静电相互作用。因此,KHBC具有作为吸附剂去除水体环境中TC的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Chemosphere
Chemosphere 环境科学-环境科学
CiteScore
15.80
自引率
8.00%
发文量
4975
审稿时长
3.4 months
期刊介绍: Chemosphere, being an international multidisciplinary journal, is dedicated to publishing original communications and review articles on chemicals in the environment. The scope covers a wide range of topics, including the identification, quantification, behavior, fate, toxicology, treatment, and remediation of chemicals in the bio-, hydro-, litho-, and atmosphere, ensuring the broad dissemination of research in this field.
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产品信息
上海源叶
Tetracycline
¥29.90~¥7479.00
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