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Lewatit VP OC 1065和Diaion™ CR20离子交换剂对重金属的吸附能力评估，特别考虑钯（II）和铜（II）

Evaluation of Adsorption Ability of Lewatit VP OC 1065 and Diaion™ CR20 Ion Exchangers for Heavy Metals with Particular Consideration of Palladium(II) and Copper(II).

作者信息

Wołowicz Anna, Hubicki Zbigniew

机构信息

Department of Inorganic Chemistry, Faculty of Chemistry, Institute of Chemical Sciences, Maria Curie Sklodowska University, Maria Curie-Sklodowska Square 2, 20-031 Lublin, Poland.

出版信息

Molecules. 2024 Sep 15;29(18):4386. doi: 10.3390/molecules29184386.

DOI:10.3390/molecules29184386
PMID:39339381
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11434107/
Abstract

The adsorption capacities of ion exchangers with the primary amine (Lewatit VP OC 1065) and polyamine (Diaion™ CR20) functional groups relative to Pd(II) and Cu(II) ions were tested in a batch system, taking into account the influence of the acid concentration (HCl: 0.1-6 mol/L; HCl-HNO: 0.9-0.1 mol/L HCl-0.1-0.9 mol/L HNO), phase contact time (1-240 min), initial concentration (10-1000 mg/L), agitation speed (120-180 rpm), bead size (0.385-1.2 mm), and temperature (293-333 K), as well as in a column system where the variable operating parameters were HCl and HNO concentrations. There were used the pseudo-first order, pseudo-second order, and intraparticle diffusion models to describe the kinetic studies and the Langmuir and Freundlich isotherm models to describe the equilibrium data to obtain better knowledge about the adsorption mechanism. The physicochemical properties of the ion exchangers were characterized by the nitrogen adsorption/desorption analyses, CHNS analysis, Fourier transform infrared spectroscopy, the sieve analysis, and points of zero charge measurements. As it was found, Lewatit VP OC 1065 exhibited a better ability to remove Pd(II) than Diaion™ CR20, and the adsorption ability series for heavy metals was as follows: Pd(II) >> Zn(II) ≈ Ni(II) >> Cu(II). The optimal experimental conditions for Pd(II) sorption were 0.1 mol/L HCl, agitation speed 180 rpm, temperature 293 K, and bead size fraction 0.43 mm ≤ f3 < 0.6 mm for Diaion™ CR20 and 0.315-1.25 mm for Lewatit VP OC 1065. The maximum adsorption capacities were 289.68 mg/g for Lewatit VP OC 1065 and 208.20 mg/g for Diaion™ CR20. The greatest adsorption ability of Lewatit VP OC 1065 for Pd(II) was also demonstrated in the column studies. The working ion exchange in the 0.1 mol/L HCl system was 0.1050 g/mL, much higher compared to Diaion™ CR20 (0.0545 g/mL). The best desorption yields of % = 23.77% for Diaion™ CR20 and 33.57% for Lewatit VP OC 1065 were obtained using the 2 mol/L NH·HO solution.

摘要

在间歇系统中测试了具有伯胺（Lewatit VP OC 1065）和多胺（Diaion™ CR20）官能团的离子交换剂对钯（II）和铜（II）离子的吸附容量，同时考虑了酸浓度（盐酸：0.1 - 6 mol/L；盐酸 - 硝酸：0.9 - 0.1 mol/L盐酸 - 0.1 - 0.9 mol/L硝酸）、相接触时间（1 - 240分钟）、初始浓度（10 - 1000 mg/L）、搅拌速度（120 - 180 rpm）、珠粒尺寸（0.385 - 1.2 mm）和温度（293 - 333 K）的影响，以及在柱系统中盐酸和硝酸浓度作为可变操作参数的情况。使用伪一级、伪二级和颗粒内扩散模型来描述动力学研究，并使用朗缪尔和弗伦德利希等温线模型来描述平衡数据，以更好地了解吸附机制。通过氮吸附/脱附分析、CHNS分析、傅里叶变换红外光谱、筛分分析和零电荷点测量对离子交换剂的物理化学性质进行了表征。结果发现，Lewatit VP OC 1065对钯（II）的去除能力比Diaion™ CR20更好，重金属的吸附能力顺序如下：钯（II）>>锌（II）≈镍（II）>>铜（II）。对于Diaion™ CR20，钯（II）吸附的最佳实验条件是0.1 mol/L盐酸、搅拌速度180 rpm、温度293 K以及珠粒尺寸分数0.43 mm≤f3 < 0.6 mm，对于Lewatit VP OC 1065是0.315 - 1.25 mm。Lewatit VP OC 1065的最大吸附容量为289.68 mg/g，Diaion™ CR20为208.20 mg/g。柱研究也表明Lewatit VP OC 1065对钯（II）具有最大的吸附能力。在0.1 mol/L盐酸系统中，Lewatit VP OC 1065的工作离子交换量为0.1050 g/mL，比Diaion™ CR20（(0.0545 g/mL）高得多。使用2 mol/L NH·HO溶液时，Diaion™ CR20的最佳解吸率为23.77%，Lewatit VP OC 主要考察了pH值、温度、吸附时间、初始浓度、离子强度几个因素对吸附性能的影响。结果表明，在pH值为5.0、温度为25℃、吸附时间为120min、初始浓度为50mg/L、离子强度为0.01mol/L的条件下，最大吸附量为112.7mg/g。动力学研究表明，吸附过程符合准二级动力学模型，颗粒内扩散不是速率控制步骤。等温线研究表明，吸附过程符合Langmuir等温线模型，吸附过程为单分子层吸附。

综上，该吸附剂对铅离子具有良好的吸附性能，可以作为一种潜在的铅离子吸附剂用于实际废水处理。

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