| 韩佳益,王雨阳,赵庆杰,吴蔚东,李建宏,范秋云,吴治澎.不同腐解阶段羊粪与海藻有机肥对Pb（Ⅱ）的吸附[J].农业环境科学学报,2021,40(9):1904-1914. |
| 不同腐解阶段羊粪与海藻有机肥对Pb（Ⅱ）的吸附 |
| Adsorption of Pb(Ⅱ) by organic sheep manure fertilizer and organic seaweed fertilizer at different decomposition stages |
| 投稿时间：2021-01-21 |
| DOI：10.11654/jaes.2021-0080 |
| 中文关键词: 有机肥 海藻 羊粪 重金属 等温吸附 吸附动力学 |
| 英文关键词: organic fertilizer seaweed sheep manure heavy metal adsorption isotherm adsorption kinetic |
| 基金项目:海南省教育厅项目（Hnky2021ZD-8）；国家重点研发计划项目（2018YFD0800703，2017YFD0202101） |
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| 中文摘要: |
| 为筛选钝化效果优良且持久的商品有机肥，通过化学分析、吸附/解吸分析、热重分析（TG-DTG）和傅里叶红外（FTIR）分析等方法，对不同腐解阶段（0、6、12个月）的羊粪（Sheep manure，SM）和海藻（Seaweed，SW）商品有机肥的基本性质进行分析，并深入研究了有机肥对水溶液体系中Pb （Ⅱ）的吸附机理。结果表明：与羊粪有机肥相比，海藻有机肥的有机碳含量和pH值较高，阳离子交换量、氧碳比和盐基饱和度较低；随着腐解过程的进行，海藻有机肥的氧碳比和阳离子交换量显著增加，官能团含量减少，而羊粪有机肥官能团含量增多，两种有机肥易分解的化合物（如纤维素、半纤维素、脂肪族物质等）随着腐解的进行而减少。未腐解时羊粪有机肥的Pb（Ⅱ）最大吸附量（qm）为198.7 mg·g-1，随着腐解过程的进行，羊粪有机肥qm降低，在腐解12个月时降低至61.6mg·g-1，而海藻有机肥qm从118.7 mg·g-1开始逐渐增加，最终达到147.1 mg·g-1。准二级动力学能更好地描述海藻、羊粪有机肥对Pb （Ⅱ）的动力学吸附过程。海藻有机肥和羊粪有机肥对Pb （Ⅱ）的吸附是以化学吸附为主的单层吸附，符合Langmuir模型。有机肥对Pb（Ⅱ）的化学吸附主要是以离子交换吸附（41.4%~47.1%）和氢键吸附（36.5%~47.3%）为主。相关分析发现，有机肥吸附Pb（Ⅱ）的qm与阳离子交换量、盐基饱和度以及氧碳比具有相关性，提高有机肥表面可交换活性位点以及含氧官能团数量可以增强有机肥的Pb （Ⅱ）吸附能力。研究表明，海藻有机肥对Pb （Ⅱ）的吸附容量高且持久性好，适合作为农田Pb （Ⅱ）污染稳定修复商品有机肥。 |
| 英文摘要: |
| The screening of commercial organic fertilizers with excellent and long-lasting immobilization effects for remediating heavy metal contamination in farmlands has received increasing attention. In this study, the basic properties of commercial organic fertilizers of sheep manure(SM) and seaweed(SW) at different stages of decomposition(0, 6, and 12 months) were analyzed by chemical analysis, sorption -desorption analysis, thermogravimetric and differential thermogravimetric analysis, and Fourier transformation infrared spectroscopy analysis. The sorption mechanism of organic fertilizers on Pb(Ⅱ) in an aqueous solution system was further investigated. The results showed that the organic carbon content and pH value of the SW fertilizer were higher compared with the SM fertilizer, while the cation exchange capacity(CEC), oxygen-carbon ratio, and base saturation were lower. As the decomposition process proceeded, the oxygen-carbon ratio and CEC of the SW fertilizer increased significantly, and the content of the functional groups decreased, whereas the functional group contents increased in the SM fertilizer. The easily decomposable compounds(e. g., cellulose, hemicellulose, aliphatic substances, etc.) in both organic fertilizers decreased as the decomposition proceeded. The maximum sorption amount(qm) of Pb(Ⅱ) in the SM fertilizer was 198.7 mg·g-1 when it was not decomposed, and the qm of Pb(Ⅱ) decreased with increasing decomposition to 61.6 mg· g-1 at 12 months of decomposition, whereas the qm of Pb(Ⅱ) of the SW fertilizer gradually increased from 118.7 mg·g-1 to 147.1 mg·g-1. The sorption kinetics of Pb(Ⅱ) on SW and SM fertilizers was expressed well by the pseudo-second-order model. The Langmuir model provided a better fit for the two fertilizers, which indicated that the Pb(Ⅱ) adsorption of the fertilizers was via the surface monolayer adsorption and mainly attributed to geochemical sorption. The geochemical sorption of Pb(Ⅱ) by organic fertilizers was mainly based on ion exchange adsorption(41.4%~47.1%) and hydrogen bonding adsorption(36.5%~47.3%). The correlation analysis revealed that the qm of Pb(Ⅱ) adsorbed by organic fertilizer was correlated with the CEC, base saturation, and oxygen-carbon ratio of the fertilizer. The sorption capacity of organic fertilizer for Pb(Ⅱ) could be enhanced by increasing the number of exchangeable active sorption sites and oxygen-containing functional groups on the surface of the organic fertilizer. The SW fertilizer has a high sorption capacity for Pb(Ⅱ) and good durability to adsorb Pb(Ⅱ); therefore, it is suitable as a commercial organic fertilizer for the stable remediation of Pb(Ⅱ) contamination in farmland. |
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