丝瓜络固定生物氧化锰吸附重金属离子

孟佑婷

文章摘要

孟佑婷.丝瓜络固定生物氧化锰吸附重金属离子[J].农业环境科学学报,2021,40(4):859-865.

丝瓜络固定生物氧化锰吸附重金属离子

Adsorption of heavy metal ions by loofah sponge-immobilized biogenic manganese oxides

投稿时间：2020-09-07

DOI：10.11654/jaes.2020-1033

中文关键词: 丝瓜络重金属吸附芽孢杆菌生物氧化锰

英文关键词: loofah sponge heavy metals adsorption Bacillus biogenic manganese oxides

基金项目:北京市科学技术研究院改革与发展经费培育类项目（PY2020HJ29）；新疆维吾尔自治区自然科学基金（2018D01C084）

作者	单位
孟佑婷	北京市科学技术研究院北京市辐射中心, 北京 100875 北京师范大学核科学与技术学院射线束技术教育部重点实验室, 北京 100875

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中文摘要:

为了考察丝瓜络固定生物氧化锰对不同重金属离子的吸附特性，本研究将锰氧化芽孢杆菌Bacillus cereus CP133固定于经过NaOH预处理的丝瓜络表面并合成生物氧化锰，制备复合生物吸附剂LIBMOs；通过扫描电镜（SEM）和傅里叶红外变换光谱（FTIR）分析LIBMOs的表面性质；考察LIBMOs对重金属离Pb²⁺、Cd²⁺、Cu²⁺和Zn²⁺的吸附特性。结果表明，NaOH预处理改善了丝瓜络的表面性质，提高了亲水性，使其能够高效地固定Bacillus cereus CP133和生物氧化锰微粒。NaOH预处理丝瓜络固定生物氧化锰的比例明显高于未经处理的天然丝瓜络，14 d后生物氧化锰固定化比例分别为79.66%和49.39%；采用Langmuir和Freundlich模型对LIBMOs吸附重金属离子的等温吸附实验数据进行拟合的结果表明，Pb²⁺和Cd²⁺的吸附行为同时符合Langmuir和Freundlich模型（R² > 0.95），但Langmuir模型能更好地拟合LIBMOs对4种重金属离子的吸附行为（R² > 0.98）。LIBMOs对Pb²⁺、Cd²⁺、Cu²⁺和Zn²⁺理论饱和吸附量（LIBMOs 2.0 g·L^-1,pH 6.0和25℃时）分别为0.81、0.68、0.51 mmol·g^-1和0.41 mmol·g^-1。采用准一级动力学模型和准二级动力学模型对吸附动力学实验数据进行拟合，4种重金属离子的吸附动力学过程更符合准一级动力学模型（R² >0.95）。以上结果表明，用丝瓜络制备的LIBMOs可作为处理重金属废水的吸附剂。

英文摘要:

The biosorption capacities of loofah sponge-immobilized biogenic manganese oxides(LIBMOs) for heavy metal ions were investigated. The manganese-oxidizing bacterium Bacillus cereus CP133 was immobilized onto NaOH-treated loofah sponge to produce biogenic manganese oxides(BMOs). Fourier transform infrared spectroscopy(FTIR) and scanning electron microscopy(SEM) analyses showed that the hydrophilicity and surface properties of the loofah sponge were improved by NaOH pretreatment. After 14 d of culture, the proportion of biogenic manganese oxides(BMOs) immobilized by the NaOH-treated loofah sponge(79.66%) was higher than that of untreated natural loofah sponge(49.39%). The Langmuir and Freundlich isotherm models were used to simulate the adsorption behaviors. On the basis of the experimental data, the adsorption behaviors of Cd²⁺ and Pb²⁺ well fitted both isotherms(R² > 0.98), while those of Cu²⁺ and Zn²⁺ better fitted the Langmuir isotherm(R² > 0.98) than the Freundlich isotherm. The adsorption capacities of the LIBMOs(2.0 g·L^-1, pH of 6.0, and 25℃) for Pb²⁺, Cd²⁺, Cu²⁺, and Zn²⁺ were 0.81, 0.68, 0.51, and 0.41 mmol·g^-1, respectively. The pseudo-first-order and pseudo-second-order models were used to simulate the adsorption kinetics. The adsorption kinetics of Pb²⁺, Cd²⁺, Cu²⁺, and Zn²⁺ by the LIBMOs could be better fitted by the pseudo-first-order model than the pseudo-second-order model, although the adsorption kinetics of Pb²⁺, Cd²⁺, and Zn²⁺ could be well fitted by both models(R² > 0.95). These findings suggest that LIBMOs have a considerable potential for the removal of heavy metal ions from aqueous solutions.

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