Sustainable synthesis of rod-shaped hydroxyapatite from calcareous sludge for copper adsorption

IF 2.7 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Material Cycles and Waste Management Pub Date : 2025-04-12 DOI:10.1007/s10163-025-02220-9

Ya-Wen Lin, Sheng-Yuan Peng, Kae-Long Lin

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引用次数: 0

Abstract

This study demonstrated the recycling of fine-grained calcareous sludge for the hydrothermal synthesis of ECO-RSHA, an adsorbent suitable for the removal of Cu²⁺ from industrial effluent. Characterization using X-ray diffractometry, field emission scanning electron spectroscopy, and Brunauer–Emmett–Teller surface area analysis revealed the growth of ECO-RSHA crystals along the c-axis, forming rod-shaped particles. In experiments, adsorption performance was assessed as a function of synthesis temperature (303–323 K), contact time (1–180 min), and sorbent dosage (1–6 g L⁻¹). ECO-RSHA synthesized under optimal conditions achieved maximum nitrogen adsorption–desorption of 70.05 cm³ g⁻¹, a specific surface area of 297.20 cm³ g⁻¹ STP, and maximum adsorption capacity of 30.41 mg g⁻¹. In experiments treating Cu²⁺-contaminated wastewater (200 mg L⁻¹) at 30°C, a moderate ECO-RSHA dosage of 6 g L⁻¹ was sufficient to remove 99% of the Cu²⁺ within 40 min. Thermodynamic analysis revealed that the adsorption of Cu²⁺ on ECO-RSHA was a spontaneous exothermic reaction with kinetics best described by the pseudo-second-order kinetic model. These results highlight the efficacy of the proposed ECO-RSHA as an eco-friendly adsorbent for the removal of Cu²⁺ from wastewater.

Graphical Abstract

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从钙质污泥中可持续合成用于吸附铜的棒状羟基磷灰石

本研究展示了细粒钙质污泥的循环利用，用于水热合成ECO-RSHA，一种适用于去除工业废水中Cu2 +的吸附剂。利用x射线衍射、场发射扫描电子能谱和Brunauer-Emmett-Teller表面积分析进行表征，发现ECO-RSHA晶体沿c轴生长，形成棒状颗粒。实验中，吸附性能随合成温度（303-323 K）、接触时间（1 - 180 min）和吸附剂用量（1 - 6 g L−1）的变化而变化。在最佳条件下合成的ECO-RSHA最大氮吸附解吸量为70.05 cm3 g−1，比表面积为297.20 cm3 g−1 STP，最大吸附量为30.41 mg g−1。在30°C条件下处理200 mg L−1 Cu2+污染废水的实验中，6 g L−1适量的ECO-RSHA足以在40 min内去除99%的Cu2+。热力学分析表明，ECO-RSHA对Cu2+的吸附是一个自发放热反应，其动力学最适合拟二级动力学模型。这些结果突出了ECO-RSHA作为一种环保型吸附剂去除废水中Cu2+的效果。图形抽象

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来源期刊

Journal of Material Cycles and Waste Management 环境科学-环境科学

CiteScore

5.30

自引率

16.10%

发文量

205

审稿时长

4.8 months

期刊介绍： The Journal of Material Cycles and Waste Management has a twofold focus: research in technical, political, and environmental problems of material cycles and waste management; and information that contributes to the development of an interdisciplinary science of material cycles and waste management. Its aim is to develop solutions and prescriptions for material cycles. The journal publishes original articles, reviews, and invited papers from a wide range of disciplines related to material cycles and waste management. The journal is published in cooperation with the Japan Society of Material Cycles and Waste Management (JSMCWM) and the Korea Society of Waste Management (KSWM).