Research on Remediation of Cadmium-Contaminated Soil by Corn Stalk Biochar/C3N4 Composites

IF 3.8 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Water, Air, & Soil Pollution Pub Date : 2024-11-27 DOI:10.1007/s11270-024-07648-7

Luying Sun, Juan Zheng, Yao Xue, Lingfeng Ye, Qijuan Fan

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Abstract

Biomass-activated carbon was prepared from agricultural waste wheat/corn straw, and then mixed with nitrogen (g-C₃N₄) in a certain proportion to synthesize carbon-based nanomaterials. Under different experimental conditions (calcination form, mixing ratio), the remediation effects of different types of carbon-based nanomaterials on cadmium (Cd) contaminated soil were investigated. The carbon-based nanomaterial system synthesized from corn biochar mixed nitrogen (g-C₃N₄) showed the best adsorption performance. On this basis, the static and dynamic adsorption properties of carbon-based nanomaterials on cadmium (Cd) in soil environment were studied through a series of characterization methods and adsorption models by changing the mixture ratio of corn straw and nitrogen (g-C₃N₄), temperature, time, substrate concentration and other background experimental conditions. The results showed that under the conditions of 35 ℃ and adsorption time ≥ 6 h, the calcined and remixed CN: YC = 2:8 samples had the best remediation effect on Cd²⁺ contaminated soil with a substrate concentration of 10 mg/L and pH value of 6. Langmuir and Freundlich’s adsorption isothermal models were used to investigate the adsorption mode of NC: YC series samples, which belong to the physical adsorption of a single molecular layer.

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玉米秸秆生物炭/C3N4 复合材料对镉污染土壤的修复研究

以农业废弃物小麦/玉米秸秆为原料制备生物质活化碳，然后与氮气（g-C3N4）按一定比例混合合成碳基纳米材料。在不同的实验条件（煅烧形式、混合比例）下，研究了不同类型的碳基纳米材料对镉（Cd）污染土壤的修复效果。由玉米生物炭混合氮（g-C3N4）合成的碳基纳米材料体系的吸附性能最佳。在此基础上，通过改变玉米秸秆与氮（g-C3N4）的混合比例、温度、时间、底物浓度等背景实验条件，采用一系列表征方法和吸附模型，研究了碳基纳米材料对土壤环境中镉（Cd）的静态和动态吸附性能。结果表明，在35 ℃、吸附时间≥6 h的条件下，煅烧后再混合的CN：YC=2：8样品对底物浓度为10 mg/L、pH值为6的Cd2+污染土壤的修复效果最好；采用Langmuir和Freundlich吸附等温模型研究了NC：YC系列样品的吸附模式，属于单分子层物理吸附。

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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.