Thamara Machado de Oliveira Ruellas, João Otávio Donizette Malafatti, Elaine Cristina Paris, Tania Regina Giraldi
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Adsorption experiments showed that the kinetics fit well with the pseudo-second-order model, with a rate constant of 2.58 ± .49 min<sup>−1</sup> mg<sup>−1</sup> and a determination coefficient (<i>R</i><sup>2</sup>) of 1.00. Isotherm analyses using Redlich–Peterson, Langmuir, and Freundlich models revealed the highest adsorption capacity and best fitting with the Redlich–Peterson model, showing maximum capacities of 30.36 mg g<sup>−1</sup> (linear fitting) and 32.11 mg g<sup>−1</sup> (nonlinear fitting). These fits achieved <i>R</i><sup>2</sup> values of .9949 and .9923, respectively, suggesting efficient and reliable adsorption profiles. 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These fits achieved <i>R</i><sup>2</sup> values of .9949 and .9923, respectively, suggesting efficient and reliable adsorption profiles. 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引用次数: 0
摘要
快速工业化带来了重大的环境挑战，包括处理高浓度锌离子废水。本研究研究了羟基磷灰石纳米颗粒作为中性ph水溶液中Zn （II）离子的吸附剂。这些纳米颗粒具有高纯度、介孔结构和60.97±0.40 m2 g−1的比表面积的特点。热重分析证实了它们的热稳定性，zeta电位测量表明表面电荷接近等电点。吸附实验表明，吸附动力学符合准二级模型，速率常数为2.58±0.49 min−1 mg−1，决定系数（R2）为1.00。采用Redlich-Peterson、Langmuir和Freundlich模型进行等温线分析，发现吸附量最高，与Redlich-Peterson模型拟合最佳，最大吸附量为30.36 mg g - 1（线性拟合）和32.11 mg g - 1（非线性拟合）。这些拟合的R2值分别为0.9949和0.9923，表明了高效可靠的吸附曲线。该研究强调了羟基磷灰石纳米颗粒有效去除锌离子的潜力，支持其在可持续工业实践和环境修复中的应用。
Kinetic and isotherm adsorption studies of Zn (II) ions on hydroxyapatite nanoparticles: Linear and nonlinear analyses
Rapid industrialization has led to significant environmental challenges, including the disposal of effluents with high zinc ion concentrations. This study investigates the use of hydroxyapatite nanoparticles as an adsorbent for Zn (II) ions from aqueous solutions at neutral pH. These nanoparticles are characterized by their high purity, mesoporous structure, and a specific surface area of 60.97 ± .40 m2 g−1. Their thermal stability was confirmed by thermogravimetric analysis, and zeta potential measurements indicated a surface charge close to the isoelectric point. Adsorption experiments showed that the kinetics fit well with the pseudo-second-order model, with a rate constant of 2.58 ± .49 min−1 mg−1 and a determination coefficient (R2) of 1.00. Isotherm analyses using Redlich–Peterson, Langmuir, and Freundlich models revealed the highest adsorption capacity and best fitting with the Redlich–Peterson model, showing maximum capacities of 30.36 mg g−1 (linear fitting) and 32.11 mg g−1 (nonlinear fitting). These fits achieved R2 values of .9949 and .9923, respectively, suggesting efficient and reliable adsorption profiles. This research highlights the potential of hydroxyapatite nanoparticles for effective zinc ion removal, supporting their application in sustainable industrial practices and environmental remediation.
期刊介绍：
The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas:
Nanotechnology applications;
Ceramic Armor;
Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors);
Ceramic Matrix Composites;
Functional Materials;
Thermal and Environmental Barrier Coatings;
Bioceramic Applications;
Green Manufacturing;
Ceramic Processing;
Glass Technology;
Fiber optics;
Ceramics in Environmental Applications;
Ceramics in Electronic, Photonic and Magnetic Applications;
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