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| 镉离子对椰壳生物炭吸附水体中壬基酚的影响研究 |
| Effects of cadmium ions on the adsorption of nonylphenol in waters by coconut shell biochar |
| Received:February 26, 2024 |
| DOI：10.13254/j.jare.2024.0116 |
| 中文关键词: 椰壳生物炭，壬基酚，Cd（Ⅱ），吸附，络合桥接作用 |
| 英文关键词: coconut shell biochar, nonylphenol, Cd（Ⅱ）, adsorption, complexation bridging effect |
| 基金项目:国家自然科学基金项目（42107081） |
| Author Name | Affiliation | E-mail | | ZHAO Liyang | School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China | | | CHEN Zhen | School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China | | | SUN Ying | School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China | | | YUE Junjie | School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China | yue_junjie@163.com | | DU Zhaolin | AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | duzhaolin@caas.cn |
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| 中文摘要: |
| 为探究Cd（Ⅱ）对椰壳生物炭（CSBC）吸附水体中壬基酚（NP）的影响，本研究设计NP单组分和Cd（Ⅱ）与NP共吸附试验，对比考察了溶液初始pH、CSBC投加量、污染物浓度和共存离子等参数对CSBC吸附NP性能的影响，开展了吸附等温模型分析和比表面积（BET）、傅里叶变换红外光谱（FTIR）等表征测试，分析 Cd（Ⅱ）在 CSBC吸附 NP中的作用机制。结果表明：pH是影响吸附的重要因素，当Cd（Ⅱ）存在时，适宜初始pH由中性变为强酸性；CSBC投加量为1 g·L-1时，平衡吸附量（6.93 mg·g-1）较NP单组分吸附量增加1.1倍。此外，CSBC对NP的吸附过程符合Langmuir和拟一级动力学模型，吸附容量受孔结构限制；热力学分析表明吸附是一个自发的放热过程。Cd（Ⅱ）对CSBC吸附NP表现出促进而非竞争作用，一方面归因于CSBC对NP和Cd（Ⅱ）不同的吸附机制，即与NP之间π–π堆积、氢键等作用，而与Cd（Ⅱ）之间则是离子交换和络合作用；另一方面则主要基于吸附态Cd（Ⅱ）与水溶液中NP分子羟基之间发生的络合桥接作用，而作用的发挥则依赖于强酸条件下Cd（Ⅱ）与CSBC表面阳离子的离子交换程度及与含氧官能团（—OH和—COOH）之间的络合位点数量。Cd（Ⅱ）对CSBC吸附NP的促进作用为生物炭吸附处理重金属和有机物的复合污染提供了有益的理论参考。 |
| 英文摘要: |
| To investigate the effect of Cd（Ⅱ）on the adsorption of nonylphenol（NP）in water by coconut shell biochar（CSBC）, this study designed NP single component and Cd（Ⅱ）- NP coadsorption experiments. The effect of initial solution pH, CSBC dosage, pollutant concentration, and coexisting ions on the adsorption performance of NP to CSBC were compared and investigated. Adsorption isotherm and other model analysis, as well as characterization results such as specific surface area and Fourier transform infrared spectroscopy（FTIR）, were conducted to analyze and discuss the interaction mechanism of Cd（Ⅱ） on NP adsorption to CSBC. The results indicated that pH was an important factor affecting adsorption. When Cd（Ⅱ）was present, the appropriate initial pH changed from neutral to strongly acidic. When the CSBC dosage was 1 g·L-1, the equilibrium adsorption capacity was 2.1 times（6.93 mg · g-1）that of NP single component adsorption. In addition, the adsorption process of NP on CSBC followed Langmuir and pseudo-first-order（kinetic models）, and the adsorption capacity was limited by the pore structure. Thermodynamic analysis showed that NP adsorption was a spontaneous exothermic process. Cd（Ⅱ）exhibited a promoting rather than competitive effect on the adsorption of NP by CSBC, which was attributed to the different adsorption mechanisms of CSBC towards NP and Cd（Ⅱ）, such as π - π stacking and hydrogen bonding with NP, while ion exchange and complexation with Cd（Ⅱ）occur. On the other hand, it was mainly based on the complexation bridging effect between adsorbed Cd（Ⅱ）and the hydroxyl groups of NP molecules in aqueous solution. The effect depends on the degree of ion exchange between Cd（Ⅱ）and the surface cations of CSBC under strong acid conditions, as well as the number of complexation sites between Cd（Ⅱ）and oxygen-containing functional groups（—OH and —COOH）. The promoting effect of Cd（Ⅱ）on the adsorption of NP by CSBC provides a beneficial theoretical reference for treating heavy metal and organic compound pollution by biochar adsorption. |
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