College of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, 113001, China.
College of Science, Shenyang University of Chemical Technology, Shenyang, 100142, China.
Chemosphere. 2023 Oct;339:139705. doi: 10.1016/j.chemosphere.2023.139705. Epub 2023 Aug 1.
An amino-carboxyl cellulose was synthesized using the grafting of glycine on the aldehyde cellulose through a Schiff base reaction for the adsorption of heavy metals with Cd and Pb as the representative. Higher affinity of the amino-carboxyl cellulose was found at pH 4.5-5.0 for Cd and 4.0-5.5 for Pb. The equilibrium was achieved within 30 min. The adsorption capacities of amino-carboxyl cellulose (Cd 85.7 mg g, Pb: 115.1 mg g, Cu: 68.2 mg g, Co: 60.1 mg g, Ni 48.5 mg g and Zn: 52.8 mg g) at 30 °C were observed. A mild increase in the adsorption capacities of Cd and Pb from 15 to 45 °C was observed. Adsorption data correlated well with the Langmuir and pseudo-second order equations, illustrating chemisorption of Cd and Pb by the amino-carboxyl cellulose. The adsorption of the amino-carboxyl cellulose for Cd and Pb was a spontaneous and endothermic. The amino-carboxyl cellulose owned a high reusability after 4 cycles.
使用席夫碱反应将甘氨酸接枝到醛纤维素上合成了一种氨基-羧基纤维素，用于吸附重金属，以 Cd 和 Pb 作为代表。在 pH 4.5-5.0 时，氨基-羧基纤维素对 Cd 的亲和力更高，在 pH 4.0-5.5 时对 Pb 的亲和力更高。平衡在 30 分钟内达到。在 30°C 时，氨基-羧基纤维素的吸附容量（Cd：85.7mg/g，Pb：115.1mg/g，Cu：68.2mg/g，Co：60.1mg/g，Ni：48.5mg/g，Zn：52.8mg/g）。在 15 至 45°C 之间，Cd 和 Pb 的吸附容量略有增加。吸附数据与 Langmuir 和准二级方程很好地相关，表明 Cd 和 Pb 通过氨基-羧基纤维素发生化学吸附。氨基-羧基纤维素对 Cd 和 Pb 的吸附是自发和吸热的。氨基-羧基纤维素在经过 4 次循环后仍具有很高的可重复使用性。
