A promising composite adsorbent of activated carbon and natural alginate for Cu(II) ion removal from aqueous solutions

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2023-09-05 DOI:10.1007/s42823-023-00598-w

Xuan Minh Vu, Thi My Hanh Le, Van Cuong Bui, Tuan Dung Nguyen, D. D. Hrynshpan, Van Thuan Le, Dai Lam Tran, Thi Phuong Lan Nguyen, Thi Lan Pham

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Abstract

Activated carbon (AC) is a versatile and extensively employed adsorbent in environmental remediation. It possesses distinct properties that can be enhanced to selectively target specific pollutants through modifications, including chemical impregnation or incorporation into composite materials. In this study, porous calcium alginate beads (PCAB) were synthesized by incorporating AC and natural alginate through ion gelation in a Ca(II) ion-containing solution, with the addition of sodium lauryl sulfate as a surfactant. The prepared PCAB was tested for Cu(II) removal. PCAB exhibited a spherical shape with higher porosity and surface area (160.19 m².g⁻¹) compared to calcium alginate beads (CAB) (0.04 m².g⁻¹). The adsorption kinetics followed the pseudo-first-order model for PCAB and the pseudo-second-order model for CAB. The Langmuir isotherm model provided the best fit for adsorption on PCAB, while the Freundlich model was suitable for CAB. Notably, PCAB demonstrated a maximum adsorption capacity of 75.54 mg.g⁻¹, significantly higher than CAB's capacity of 9.16 mg.g⁻¹. Desorption studies demonstrated that 0.1 M CaCl₂ exhibited the highest efficiency (90%) in desorbing Cu(II) ions from PCAB, followed by 0.1 M HCl and 0.1 M NaCl. PCAB showed efficient reusability for up to four consecutive adsorption–desorption cycles. The fixed-bed column experiment confirmed the match with the Thomas model to the breakthrough curves with q_TH of 120.12 mg.g⁻¹ and 68.03 mg.g⁻¹ at a flow rate of 1 mL.min⁻¹ and 2 mL.min⁻¹, respectively. This study indicated that PCAB could be an effective adsorbent for Cu(II) removal, offering insights for further application and design considerations.

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一种很有前途的活性炭和天然海藻酸盐复合吸附剂，用于去除水溶液中的Cu(II)离子

活性炭（AC）是一种用途广泛的环境修复吸附剂。它具有独特的特性，可以通过改性（包括化学浸渍或加入复合材料）来增强其选择性地针对特定污染物。本研究通过在含 Ca（II）离子的溶液中进行离子凝胶化，并加入月桂基硫酸钠作为表面活性剂，合成了多孔海藻酸钙珠子（PCAB）。对制备的 PCAB 进行了去除铜（II）的测试。与海藻酸钙珠（CAB）（0.04 m2.g-1）相比，PCAB 呈球形，具有更高的孔隙率和表面积（160.19 m2.g-1）。PCAB 的吸附动力学遵循伪一阶模型，CAB 的吸附动力学遵循伪二阶模型。Langmuir 等温线模型最适合 PCAB 的吸附，而 Freundlich 模型则适用于 CAB。值得注意的是，PCAB 的最大吸附容量为 75.54 mg.g-1，明显高于 CAB 的 9.16 mg.g-1。解吸研究表明，0.1 M CaCl2 从 PCAB 中解吸 Cu(II) 离子的效率最高（90%），其次是 0.1 M HCl 和 0.1 M NaCl。PCAB 在连续四次吸附-解吸循环中都表现出高效的重复利用率。固定床柱实验证实，在流量为 1 mL.min-1 和 2 mL.min-1 时，突破曲线的 qTH 分别为 120.12 mg.g-1 和 68.03 mg.g-1，与托马斯模型相符。这项研究表明 PCAB 是一种有效的去除铜(II)的吸附剂，为进一步的应用和设计提供了启示。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.