A promising modified polyvinyl chloride for adsorption of boron: Preparation, adsorption kinetics, isotherm, and thermodynamic studies

IF 3.8 4区工程技术 Q2 CHEMISTRY, APPLIED

Journal of Vinyl & Additive Technology Pub Date : 2023-09-22 DOI:10.1002/vnl.22052

Huda M. Younis, Amal A. Mohamed

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引用次数: 0

Abstract

A new promising N-methyl-D-glucamine modified polyvinyl chloride via methyl glycinate linker (PVC-MG-NMDG) was designed to extract boron from tourmaline ore from the Sikait area in the South Eastern Desert of Egypt, which assays 10.43% B₂O₃. Specifications for PVC-MG-NMDG composite were executed successfully utilizing sundry approaches, such as FT-IR, XPS, GC–MS, TGA, BET, EDX, ¹³C-NMR, ¹H-NMR, ICP-OES, and XRD, which assure an acceptable synthesis of PVC-MG-NMDG. Optimized factors like pH, agitation time, primary boron concentration, composite dose, co-ions, eluting agents, and temperature have been improved. At ambient temperature, pH 9, 10 min of agitation, and 0.0138 mol/L boron ions (150 ppm), the PVC-MG-NMDG composite has a 25 mg/g maximal uptake. The extraction-distribution isotherm modeling suggests that the Langmuir model, with a theoretical value of 25.38 mg/g, more closely matches the practical value of 25 mg/g than the Freundlich model. The adsorption kinetics of boron ions by PVC-MG-NMDG were predicted with high accuracy using a pseudo-second order kinetic model, yielding a theoretical retention capacity of 27.93 mg/g. The extraction process was predicted, as shown by thermodynamic calculations, exothermic, spontaneous, and optimal extraction at low temperature; the thermodynamic factors controlling ΔS (−0.04 kJ/mol), ΔH (−13.74 kJ/mol), and ∆G values rise from −1.82 kJ/mol at 298 K to −0.19 kJ/mol at 338 K. Boron ions can be eluted from the overloaded composite by 0.5 M H₂SO₄ with a 95% efficiency rate. It was established that PVC-MG-NMDG composite reveals a worthy separation factor to most co-ions and gives a good separation power. Boric acid with a boron content of 17.23% and purity of 98.56% can be obtained through alkali fusion with NaOH flux and subsequent adsorption using a PVC-MG-NMDG composite.

Highlights

A New modified polyvinyl chloride (PVC-MG-NMDG) was successfully prepared.
The characteristics of new composite were verified via different techniques.
The new composite reached its maximum boron absorption of 25 mg/g at 25°C.
The extraction as an exothermic, spontaneous process at low temperature.
The new composite has been applied to a real sample of Sikait tourmaline ore.

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一种有望吸附硼的改性聚氯乙烯：制备、吸附动力学、等温线和热力学研究

我们设计了一种新型的 N-甲基-D-葡糖胺通过甘氨酸甲酯连接剂改性聚氯乙烯（PVC-MG-NMDG），用于从埃及东南沙漠锡凯特地区的碧玺矿石中提取硼，该矿石的 B2O3 含量为 10.43%。利用 FT-IR、XPS、GC-MS、TGA、BET、EDX、13C-NMR、1H-NMR、ICP-OES 和 XRD 等多种方法，成功实现了 PVC-MG-NMDG 复合材料的规格要求，确保了 PVC-MG-NMDG 的合成是可接受的。对 pH 值、搅拌时间、主硼浓度、复合剂量、共离子、洗脱剂和温度等因素进行了优化。在环境温度、pH 值为 9、搅拌时间为 10 分钟、硼离子浓度为 0.0138 摩尔/升（150 ppm）的条件下，PVC-MG-NMDG 复合材料的最大吸收量为 25 毫克/克。萃取-分布等温线模型表明，理论值为 25.38 mg/g 的 Langmuir 模型比 Freundlich 模型更接近 25 mg/g 的实际值。使用伪二阶动力学模型对 PVC-MG-NMDG 对硼离子的吸附动力学进行了高精度预测，得出理论保留容量为 27.93 毫克/克。热力学计算表明，萃取过程在低温下是放热的、自发的和最佳的；控制ΔS（-0.04 kJ/mol）、ΔH（-13.74 kJ/mol）和ΔG 值的热力学因子从 298 K 时的-1.82 kJ/mol 上升到 338 K 时的-0.19 kJ/mol。结果表明，PVC-MG-NMDG 复合材料对大多数共离子具有良好的分离系数和分离能力。使用 PVC-MG-NMDG 复合材料与 NaOH 通量进行碱熔，然后进行吸附，可获得硼含量为 17.23%、纯度为 98.56% 的硼酸。亮点成功制备了新型改性聚氯乙烯（PVC-MG-NMDG）。通过不同的技术验证了新型复合材料的特性。新型复合材料在 25°C 时的最大硼吸收量为 25 mg/g。在低温条件下，萃取是一个自发的放热过程。新复合材料已被应用于锡凯特电气石矿的实际样品。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Vinyl & Additive Technology 工程技术-材料科学：纺织

CiteScore

5.40

自引率

14.80%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Vinyl and Additive Technology is a peer-reviewed technical publication for new work in the fields of polymer modifiers and additives, vinyl polymers and selected review papers. Over half of all papers in JVAT are based on technology of additives and modifiers for all classes of polymers: thermoset polymers and both condensation and addition thermoplastics. Papers on vinyl technology include PVC additives.