CaCO3-activited N-doped diatom biochar for the degradation of tetracycline

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2024-10-15 DOI:10.1016/j.molliq.2024.126260

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Abstract

In this study, a N-doped diatom biochar (DBC) was prepared by one-step pyrolysis, where CaCO₃ formed by marine diatom-mediated calcification was employed as an activator. Due to the activation effect of CaCO₃, the specific surface area of the obtained DBC increased by more than 10 times, and the nitrogen presented as pyrrolic nitrogen (58.9%), pyridinic nitrogen (29.7%), and graphitic nitrogen (11.4%) in the DBC. In addition, the effects of important parameters and co-existing ions on the catalytic decomposition of tetracycline (TC) by DBC were investigated by using TC as a typical pollutant and PDS as an oxidant. The DBC/PDS system exhibited high activity over a broad pH range. Through radical scavenging experiments, electron spin resonance, and electrochemical results analysis, it was found that the degradation of TC in the system included both radical and nonradical pathways, and the most dominant reactive species was ¹O₂. Furthermore, the surficial reactive complexes formed by PDS on the catalysts also played an important role in attacking the adsorbed TC molecules. This study proposes an eco-friendly and economical technique to construct a clean advanced oxidation process capable of treating TC wastewater by utilizing the native biomass of diatom as a metal-free and efficient biochar catalyst while simultaneously reducing the use of chemical reagents.

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用于降解四环素的 CaCO3 活性掺氮硅藻生物炭

本研究采用一步热解法制备了一种掺氮硅藻生物炭（DBC），并将海洋硅藻介导钙化形成的 CaCO3 用作活化剂。由于 CaCO3 的活化作用，得到的 DBC 比表面积增加了 10 倍以上，DBC 中的氮呈现为吡咯氮（58.9%）、吡啶氮（29.7%）和石墨氮（11.4%）。此外，以四环素（TC）为典型污染物，以 PDS 为氧化剂，研究了重要参数和共存离子对 DBC 催化分解四环素（TC）的影响。在较宽的 pH 值范围内，DBC/PDS 系统均表现出较高的活性。通过自由基清除实验、电子自旋共振和电化学结果分析发现，TC 在该体系中的降解包括自由基和非自由基途径，最主要的反应物是 1O2。此外，PDS 在催化剂上形成的表面活性复合物在攻击吸附的 TC 分子方面也发挥了重要作用。本研究提出了一种环保、经济的技术，即利用硅藻的原生生物质作为无金属、高效的生物炭催化剂，构建一种能够处理三氯甲烷废水的清洁高级氧化工艺，同时减少化学试剂的使用。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.