Preparation for a Novel N-Doped Magnetic Sludge-Based Biochar and Application for Norfloxacin Removal from Wastewater

IF 3.8 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Water, Air, & Soil Pollution Pub Date : 2024-10-22 DOI:10.1007/s11270-024-07558-8

Junming Yi, Dongsheng Feng, Jiangzhe Fu, Yuxin Liu, Ruihui Gong, Peizu Liu, Jing Guo, Kai Cui, Huidong Li

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Abstract

Nowadays, the use of antibiotics is widespread which is causing great pressure on the ecological environment. Incorporation of nitrogen source in biochar can improve its adsorption performance, which is widely used as an adsorbent due to its high efficiency and low-cost. In this study, municipal sludge and red mud were used as raw materials, urea as nitrogen source and KOH and ammonium oxalate as activators to prepare N-doped sludge-based magnetic biochar (NBC) by co-pyrolysis for adsorption of norfloxacin (NOR) in wastewater. The experiment was conducted using 50 mL of NOR wastewater with a concentration of 100 mg/L. The optimal adsorption conditions were identified as 1.6 g/L dosage, pH 5, and temperature 25 °C. The actual adsorption capacity of NBC reached a maximum of 160.25 mg/g. The maximum adsorption capacity of NBC was 388.82 mg/g, which was measured by Langmuir isothermal modelling. The adsorption kinetics are consistent with a pseudo-second order model, while the adsorption isotherms are consistent with the Langmuir and Freundlich models. The characterization demonstrates that NBC is a rough and porous material, with a specific surface area of 192.8397 m2/g and a surface functional group composition including -OH/NH, C = C, C = N, C-O. The main mechanisms of this research include pore filling, π-π interactions, H-bonding and electrostatic interactions. The introduction of a nitrogen source to sludge-based magnetic biochar (BC) has improved its performance in various aspects of adsorption. This paper demonstrates the excellence of NBC by comparing the adsorption performance of NOR with that of BC, which has great potential for future practical applications.

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新型 N-掺杂磁性污泥基生物炭的制备及其在去除废水中诺氟沙星中的应用

如今，抗生素的广泛使用给生态环境造成了巨大压力。在生物炭中加入氮源可以提高其吸附性能，生物炭因其高效、低成本而被广泛用作吸附剂。本研究以市政污泥和赤泥为原料，尿素为氮源，KOH 和草酸铵为活化剂，通过共热解制备了掺氮污泥基磁性生物炭（NBC），用于吸附废水中的诺氟沙星（NOR）。实验使用 50 mL 浓度为 100 mg/L 的 NOR 废水。确定的最佳吸附条件为：用量 1.6 g/L、pH 值 5、温度 25 °C。NBC 的实际吸附容量达到最大值 160.25 mg/g。兰缪尔等温模型测得 NBC 的最大吸附容量为 388.82 mg/g。吸附动力学符合伪二阶模型，而吸附等温线则符合 Langmuir 和 Freundlich 模型。表征结果表明，NBC 是一种粗糙的多孔材料，比表面积为 192.8397 m2/g，表面官能团组成包括 -OH/NH、C = C、C = N、C-O。这项研究的主要机制包括孔隙填充、π-π相互作用、H 键和静电相互作用。在以污泥为基础的磁性生物炭（BC）中引入氮源改善了其各方面的吸附性能。本文通过比较 NOR 与 BC 的吸附性能，展示了 NBC 的卓越性能，这在未来的实际应用中具有巨大潜力。

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来源期刊

Water, Air, & Soil Pollution 环境科学-环境科学

CiteScore

4.50

自引率

6.90%

发文量

448

审稿时长

2.6 months

期刊介绍： Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments. Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation. Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.