Guangdong Engineering Technology Research Center of Low Carbon Agricultural Green Inputs, South China Agricultural University, Guangzhou City, 510642, China.
R&D Center of Environmental Friendly Fertilizer Science and Technology of Education Department of Guangdong Province, College of Natural Resources and Environment, South China Agricultural University, Guangzhou City, 510642, China.
Sci Rep. 2024 Jun 15;14(1):13821. doi: 10.1038/s41598-024-63954-4.
The problem of cadmium pollution and its control is becoming increasingly severe issue in the world. Banana straw is an abundant bio raw material, but its burning or discarding in field not only causes pollution but also spreads fusarium wilt. The objective of this paper is to utilize biochar derived from the wilt-infected banana straw for remediation of Cd(II) pollution while to eliminate the pathogen. The activity of wilt pathogen in biochar was determined by PDA petri dish test. The Cd(II) adsorption of the biochar was determined by batch adsorption experiments. The effects of KOH concentration (0.25, 0.5 and 0.75 M) on the physicochemical characteristics of the biochar were also observed by BET, SEM, FTIR, XRD and XPS. Results showed that pristine banana straw biochar (PBBC) did not harbor any pathogen. The specific surface area (SSA) and Cd(II) adsorption capacity of 0.75 M KOH modified banana straw biochar (MBBC) were increased by 247.2% and 46.1% compared to that of PBBC, respectively. Cd(II) adsorption by MBBC was suitable to be described by the pseudo-second-order kinetic model and Freundlich isotherm. After Cd(II) adsorption, the CdCO were confirmed by XRD and observed through SEM. The weakness and shift of oxygen-containing functional groups in MBBC after Cd(II) adsorption implied that those groups were complexed with Cd(II). The results showed that pyrolysis could not only eliminate banana fusarium wilt, but also prepare porous biochar with the wilt-infected banana straw. The porous biochar possessed the potential to adsorb Cd(II) pollutants.
镉污染及其控制问题是世界范围内日益严重的问题。香蕉秸秆是一种丰富的生物原料，但将其燃烧或丢弃在田间不仅会造成污染，还会传播枯萎病。本文的目的是利用枯萎病感染的香蕉秸秆生物炭来修复 Cd(II)污染，同时消除病原体。通过 PDA 培养皿试验来确定生物炭中枯萎病病原体的活性。通过批量吸附实验来确定生物炭对 Cd(II)的吸附能力。还观察了 KOH 浓度（0.25、0.5 和 0.75 M）对生物炭物理化学特性的影响，使用 BET、SEM、FTIR、XRD 和 XPS 进行了观察。结果表明，原始香蕉秸秆生物炭（PBBC）不含有任何病原体。与 PBBC 相比，0.75 M KOH 改性香蕉秸秆生物炭（MBBC）的比表面积（SSA）和 Cd(II)吸附能力分别增加了 247.2%和 46.1%。MBBC 对 Cd(II)的吸附更适合用伪二级动力学模型和 Freundlich 等温线来描述。Cd(II)吸附后，XRD 证实了 CdCO 的存在，并通过 SEM 观察到了它。MBBC 中含氧官能团在 Cd(II)吸附后的减弱和位移表明这些基团与 Cd(II)发生了络合。结果表明，热解不仅可以消除香蕉枯萎病，还可以用感染枯萎病的香蕉秸秆制备多孔生物炭。多孔生物炭具有吸附 Cd(II)污染物的潜力。
