School of Civil Engineering, Wuhan University, Wuhan, China.
School of Civil Engineering, Wuhan University, Wuhan, China.
J Colloid Interface Sci. 2019 Oct 15;554:417-423. doi: 10.1016/j.jcis.2019.06.096. Epub 2019 Jun 29.
In this study, crayfish shell was pyrolyzed at 600 °C to obtain a calcium-rich biochar (CS600). The biochar was saturated with Pb in batch adsorption experiment. Six desorption reagents including HCl, HNO, HSO, NaOH, EDTA and EDTA-2NaCa were then used to desorb Pb from the post-adsorption CS600 to determine the desorption mechanism. Lead adsorption experiments were performed to determine the adsorption capacity of the regenerated CS600. HCl, HNO, EDTA and EDTA-2NaCa presented good desorption effect with desorption rates all over 80%. Most of the regenerated biochars lost their lead adsorption ability due to the destruction of CaCO mineral on their surface. Only the one desorbed by EDTA-2NaCa retained a preferable lead adsorption capacity. EDTA-2NaCa thus is a promising desorption reagent of CS600 for the removal of lead from aqueous solutions.
在这项研究中，小龙虾壳在 600°C 下进行热解，得到一种富含钙的生物炭（CS600）。在批量吸附实验中，生物炭用 Pb 饱和。然后使用六种解吸试剂，包括 HCl、HNO、HSO、NaOH、EDTA 和 EDTA-2NaCa，从吸附后的 CS600 中解吸 Pb，以确定解吸机制。进行 Pb 吸附实验以确定再生 CS600 的吸附容量。HCl、HNO、EDTA 和 EDTA-2NaCa 表现出良好的解吸效果，解吸率均超过 80%。由于表面 CaCO 矿物的破坏，大多数再生生物炭失去了 Pb 的吸附能力。只有用 EDTA-2NaCa 解吸的生物炭保留了较好的 Pb 吸附能力。因此，EDTA-2NaCa 是一种有前途的 CS600 解吸试剂，可用于从水溶液中去除 Pb。
