Preparation of Au Nanoparticle Loaded Biochar/Polydopamine Composites for Adsorption of MB and MG Dyes from Aqueous Solution

IF 0.6 4区化学 Q4 CHEMISTRY, APPLIED Russian Journal of Applied Chemistry Pub Date : 2024-08-20 DOI:10.1134/s1070427224020113

Hui Li, Dongxue Shen, Zhe Yang, Guojia Ji, Zhiwei Zhang, Xulin Lu, Jingmei Zhang, Zhongbao Zhao

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Abstract

Au nanoparticles loaded on biochar (PDA-BC/Au) was prepared using adhesion and reduction properties of polydopamine by in-situ reduction method. PDA-BC/Au was characterized by the specific surface area analyzer (BET), the scanning electron microscope (SEM), the transmission electron microscopy (TEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectrometry (FTIR). Analysis results prove the successful synthesis of composites decorated with Au nanoparticles in the biochar matrix coating with polydopamine layer. PDA-BC/Au was employed as an adsorbent to remove the cationic dyes (MB and MG) from aqueous solution. The tests confirm that PDA-BC/Au can remove up to 99.0% of MB within 30 min and achieve removal rate over 97.2% of MG after 60 min adsorption. Adsorption kinetics and isotherm models reflect that the adsorption of dyes by PDA-BC/Au has a better fit with pseudo-secondary kinetic equation and the Langmuir adsorption model, displaying chemisorption-dominated single-molecule layer adsorption mechanism. Additionally, after five recycling cycles, the removal rates of PDA-BC/Au for MB and MG only dropped by 3.10 and 2.58% respectively, making clear good stability for long term use. Collectively, the developed PDA-BC/Au adsorbent indicates enormous promise for cationic dye removal and efficient utilization of waste biomass resources.

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制备负载金纳米粒子的生物炭/多巴胺复合材料以吸附水溶液中的 MB 和 MG 染料

摘要采用原位还原法，利用多巴胺的粘附性和还原性制备了负载在生物炭上的金纳米粒子（PDA-BC/Au）。比表面积分析仪（BET）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线衍射仪（XRD）、X 射线光电子能谱（XPS）和傅立叶变换红外光谱（FTIR）对 PDA-BC/Au 进行了表征。分析结果证明，在涂有聚多巴胺层的生物炭基质中成功合成了饰有金纳米颗粒的复合材料。PDA-BC/Au 被用作吸附剂来去除水溶液中的阳离子染料（MB 和 MG）。试验证实，PDA-BC/Au 可在 30 分钟内去除高达 99.0% 的甲基溴，吸附 60 分钟后对 MG 的去除率超过 97.2%。吸附动力学和等温线模型表明，PDA-BC/Au 对染料的吸附与伪二次动力学方程和 Langmuir 吸附模型的拟合度较高，显示出化学吸附为主的单分子层吸附机理。此外，经过五个循环后，PDA-BC/Au 对 MB 和 MG 的去除率仅分别下降了 3.10% 和 2.58%，显然具有良好的长期使用稳定性。总之，所开发的 PDA-BC/Au 吸附剂在去除阳离子染料和有效利用废弃生物质资源方面前景广阔。

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来源期刊

Russian Journal of Applied Chemistry 化学-应用化学

CiteScore

1.60

自引率

11.10%

发文量

审稿时长

2-4 weeks

期刊介绍： Russian Journal of Applied Chemistry (Zhurnal prikladnoi khimii) was founded in 1928. It covers all application problems of modern chemistry, including the structure of inorganic and organic compounds, kinetics and mechanisms of chemical reactions, problems of chemical processes and apparatus, borderline problems of chemistry, and applied research.