| 生物炭吸附溶液中Pb2+的定性及定量研究 |
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| 引用本文： | 姜家豪,黄笑乐,任纪云,朱正荣,邓磊,车得福.生物炭吸附溶液中Pb2+的定性及定量研究[J].化工学报,2023,74(2):830-842. |
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| 作者姓名： | 姜家豪 黄笑乐 任纪云 朱正荣 邓磊 车得福 |
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| 作者单位： | 1.西安交通大学动力工程多相流国家重点实验室，陕西 西安 710049;2.昆明物理研究所，云南 昆明 650223 |
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| 基金项目： | 国家自然科学基金项目(51406147) |
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| 摘 要： | 由木质纤维素类生物质经过热解制得的生物炭能够高效地吸附污水中的重金属离子，将其作为Pb2+吸附剂，具有广阔的应用前景。本文以松木与大豆秸秆为原料，分别在400、600、800℃下制备了生物炭，考察了其理化特性与吸附性能之间的关系，并对各吸附机制的相对贡献进行了定性及定量分析。研究结果表明：大豆秸秆生物炭的吸附性能(最大吸附容量分别为209.35、180.62和226.64 mg·g-1)远优于松木生物炭的(4.62、12.02和23.47 mg·g-1)。6种生物炭对Pb2+的吸附过程都符合Langmuir模型和拟二级动力学模型，以化学吸附为主，受物理微观结构的影响较小。阳离子交换在生物炭吸附Pb2+过程中占据重要作用，其中Ca2+的交换能力最强。Pb2+在生物炭表面的矿物沉淀主要为水白铅矿和碳酸铅。矿物质沉淀(贡献占比21.9%～76.8%)和阳离子交换(18.1%～72.5%)是大豆秸秆炭和松木炭对Pb2+的...
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| 关 键 词： | 生物炭 吸附特性 污水 Pb2+ 吸附机制 定量分析 |
| 收稿时间： | 2022-09-27 |
Qualitative and quantitative study on Pb2+ adsorption by biochar in solution |
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| Jiahao JIANG,Xiaole HUANG,Jiyun REN,Zhengrong ZHU,Lei DENG,Defu CHE.Qualitative and quantitative study on Pb2+ adsorption by biochar in solution[J].Journal of Chemical Industry and Engineering(China),2023,74(2):830-842. |
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| Authors: | Jiahao JIANG Xiaole HUANG Jiyun REN Zhengrong ZHU Lei DENG Defu CHE |
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| Affiliation: | 1.State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China;2.Kunming Institute of Physics, Kunming 650223, Yunnan, China |
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| Abstract: | Biochar produced by pyrolysis of lignocellulosic biomass can efficiently adsorb heavy metal ions in sewage, and it has broad application prospects as a Pb2+ adsorbent. In this paper, pine wood and soybean straw were applied as raw materials to prepare biochar at 400, 600, and 800℃, respectively. The relationship between physicochemical properties and adsorption performance of biochar was investigated, and the relative contributions of adsorption mechanisms were qualitatively and quantitatively analyzed. The results showed that the adsorption performance of soybean straw biochar (the adsorption capacity was 209.35, 180.62 and 226.64 mg·g-1 respectively) was much higher than that of pine wood biochar (4.62, 12.02 and 23.47 mg·g-1). The adsorption process of Pb2+ on the six biochars were all in accordance with the Langmuir model and the pseudo-second-order kinetic model, and was dominated by chemical adsorption, which was less affected by the microstructure. Cation exchange played an important role in the adsorption of Pb2+ by biochar, among which Ca2+ had the strongest exchange capacity. The precipitation of Pb2+ was mainly to form hydrocerussite and lead carbonate. With the increase of pyrolysis temperature, the content of organic functional groups and aromatic rings on the surface of biochar decreased. Mineral precipitation (relative contribution of 21.9%—76.8%) and cation exchange (18.1%—72.5%) were the main Pb2+ adsorption mechanisms of soybean straw biochar and pine wood biochar, followed by π-electron interaction and functional group complexation. |
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| Keywords: | biochar adsorption characteristics waste water Pb2+ adsorption mechanisms quantitative analysis |
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