一种源自于枣核的具有应用前景和成本效益的生物炭吸附剂，用于从水溶液中去除 Pb(II)。

A promising and cost-effective biochar adsorbent derived from jujube pit for the removal of Pb(II) from aqueous solution.

机构信息

School of Port and Transportation Engineering, Zhejiang Ocean University, Zhoushan, 316022, China.

出版信息

Sci Rep. 2020 May 4;10(1):7473. doi: 10.1038/s41598-020-64191-1.

This study evaluated the Pb(II) sorption capacity of jujube pit biochar (JPB) in aqueous solution, which was derived from jujube pit by pyrolysis and used as a promising and economical adsorbent. More importantly, the utilization of JPB could realize the recycling of agricultural residues. The JPB was characterized using conventional science technologies, including SEM, BET and FT-IR, and the sorption capacity of JPB for lead ions was investigated according to different adsorption parameters, such as the kinetics data, solution pH, isotherms data, coexisting ions of Na and K, desorption and reusability, and solution temperature. The results of kinetics data suggested that the lead ion adsorption process by JPB could be fast to reach equilibrium within 30 min. Additionally, the adsorption capacity of JPB for Pb(II) was calculated to be maximum for 137.1 mg/g at pH 6.0. More importantly, after five cycles of desorption and reuse, the JPB still reached 70% of its original adsorption capacity. All the results suggested that JPB had a broad application prospect for the purification of lead ions in practical.

本研究评估了由枣核经热解得到的枣核生物炭（JPB）在水溶液中对 Pb(II) 的吸附能力，作为一种有前途且经济的吸附剂。更重要的是，JPB 的使用实现了农业废弃物的回收利用。使用 SEM、BET 和 FT-IR 等常规科学技术对 JPB 进行了表征，并根据不同的吸附参数（如动力学数据、溶液 pH 值、等温线数据、共存的 Na 和 K 离子、解吸和可重复使用性以及溶液温度）研究了 JPB 对铅离子的吸附容量。动力学数据的结果表明，JPB 对 Pb(II) 的吸附过程可以很快在 30 分钟内达到平衡。此外，在 pH 值为 6.0 时，JPB 对 Pb(II) 的吸附容量最大，计算值为 137.1mg/g。更重要的是，经过五次解吸和再利用循环后，JPB 仍达到其原始吸附容量的 70%。所有结果表明，JPB 在实际应用中对铅离子的净化具有广阔的应用前景。