改性竹基生物炭对铀的吸附特性及其机理分析

doi:10.11894/iwt.2020-0726

摘要/Abstract

摘要：

为了去除水体中的铀污染，以毛竹为原料，采用化学活化法制备改性竹基生物炭吸附材料。考察了吸附时间、吸附剂投加量、溶液初始pH和初始铀浓度对吸附效果的影响。通过扫描电镜、能谱分析、傅立叶变换红外光谱等分析手段，研究了改性竹基生物炭材料对铀吸附前后表面性质的变化。研究结果表明，改性竹基生物炭材料适用于pH为4.5的含铀水溶液的处理，并且该材料对铀的去除率远远高于竹基生物炭材料。

关键词: 毛竹, 生物炭, 吸附, 铀污染

Abstract:

In order to remove uranium pollution in water, modified bamboo-based biochar adsorbent was prepared by chemical activation method with bamboo as raw material. The effects of adsorption time, dosage of bamboo-based carbon, initial pH of solution and initial concentration of uranium on the adsorption were investigated. The surface properties of bamboo-based activated carbon before and after uranium adsorption were studied by means of SEM, EDX and FTIR. The results showed that the modified bamboo based biochar was suitable for the treatment of aqueous solution containing uranium at pH 4.5, and the removal rate of uranium was much higher than that of bamboo based biochar.

Key words: phyllostachys pubescens, biochar, adsorption, uranium pollution

中图分类号:

X703.1

杜家豪,赖金龙,罗学刚. 改性竹基生物炭对铀的吸附特性及其机理分析[J]. 工业水处理, 2021, 41(5): 119-124.

Jiahao Du,Jinlong Lai,Xuegang Luo. Analysis of adsorption characteristics and mechanism of modified bamboo-based biochar for uranium[J]. Industrial Water Treatment, 2021, 41(5): 119-124.

https://www.iwt.cn/CN/Y2021/V41/I5/119

图/表 10

参考文献 32

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吸附材料	Langmuir			Freundlich
吸附材料	q_m/（mg·g^-1）	K_L/（L·mg^-1）	R²	K_F	1/n	R²
BC	43.72	0.055	0.994	6.578	0.388	0.914
BC-AC	71.63	0.095	0.993	12.587	0.392	0.778

吸附材料	Langmuir			Freundlich
吸附材料	q_m/（mg·g^-1）	K_L/（L·mg^-1）	R²	K_F	1/n	R²
BC	43.72	0.055	0.994	6.578	0.388	0.914
BC-AC	71.63	0.095	0.993	12.587	0.392	0.778

吸附材料	准一级动力学模型			准二级动力学模型
吸附材料	q_e/（mg·g^-1）	k₁/min^-1	R²	q_e/（mg·g^-1）	k₂/（g·mg^-1·min^-1）	R²
BC	14.19	0.368	0.975	29.72	0.053	0.998
BC-AC	16.82	0.697	0.846	47.51	0.096	0.999

吸附材料	准一级动力学模型			准二级动力学模型
吸附材料	q_e/（mg·g^-1）	k₁/min^-1	R²	q_e/（mg·g^-1）	k₂/（g·mg^-1·min^-1）	R²
BC	14.19	0.368	0.975	29.72	0.053	0.998
BC-AC	16.82	0.697	0.846	47.51	0.096	0.999

吸附剂	吸附量/（mg·g^-1）	参考文献
椰壳活性炭	3	〔29〕
海藻酸钠氧化石墨烯凝胶珠	29.4	〔30〕
石墨烯	30	〔31〕
负载型Al（OH）₃/SiO₂	110	〔32〕
BC-AC	46.23	本研究
BC	26.43	本研究

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