School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China.
School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory for Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou 510006, China.
Int J Biol Macromol. 2018 Oct 1;117:1305-1313. doi: 10.1016/j.ijbiomac.2018.05.204. Epub 2018 May 28.
Lead is one of the highly toxic metals reaching the water bodies from industries and discarded domestic wastes. Chitosan and its derivatives can be used to modify magnetic materials to promote the adsorption properties of the magnetic materials for the removal of metal ions. The obtained ECCSB@FeO was characterized by XRD, FTIR, SEM, TEM and VSM analysis. The effect of solution pH, adsorbent dosage, contact time, initial metal ion concentration and temperature effect was studied. The results of the batch sorption kinetic experiments were substituted into the pseudo-first order, pseudo-second order and intraparticle diffusion models. The R and SSE results show that pseudo-second order equation describes the sorption process very well. Adsorption process revealed that the initial uptake of Pb(II) was rapid and equilibrium was achieved within 105 min. Langmuir and Freundlich adsorption isotherm models were applied to represent adsorption isotherm data. The equilibrium data were well fitted by the Langmuir isotherm model by revealing the maximum sorption capacity value 86.20 mg/g of ECCSB@FeO. Different thermodynamic parameters, namely, changes in standard Gibbs energy, enthalpy, and entropy, were also evaluated from the temperature dependence, and the results suggest that the adsorption reaction is spontaneous and endothermic in nature.
铅是一种高度有毒的金属，它会从工业和废弃的家庭废物进入水体。壳聚糖及其衍生物可用于修饰磁性材料，以提高磁性材料对金属离子的吸附性能。通过 XRD、FTIR、SEM、TEM 和 VSM 分析对获得的 ECCSB@FeO 进行了表征。研究了溶液 pH 值、吸附剂用量、接触时间、初始金属离子浓度和温度效应的影响。将分批吸附动力学实验的结果代入伪一级、伪二级和内扩散模型。R 和 SSE 的结果表明，伪二级方程很好地描述了吸附过程。吸附过程表明，Pb(II)的初始吸收速度很快，在 105 分钟内达到平衡。Langmuir 和 Freundlich 吸附等温线模型被用来表示吸附等温线数据。通过揭示 ECCSB@FeO 的最大吸附容量值 86.20mg/g，平衡数据很好地符合 Langmuir 等温线模型。还从温度依赖性评估了不同的热力学参数，即标准吉布斯自由能、焓和熵的变化，结果表明吸附反应是自发的和吸热的。
