Removal of Hg2+ ions by adsorption using (TiO2@MnO2)-NPs nanocomposite

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 : 2023-07-05 DOI:10.1007/s10163-023-01743-3

Daniel Moro Druzian, Pâmela Cristine Ladwig Muraro, Leandro Rodrigues Oviedo, Matheus Londero da Costa, Robson Dias Wouters, Sthéfany Nunes Loureiro, William Leonardo da Silva, João Henrique Zimnoch dos Santos

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引用次数: 1

Abstract

Waste water contaminated with inorganic mercury is considered a serious environmental problem, mainly due to the hazardous effects this contaminant causes on human health. Thus, the present work aims to evaluate the potentiality of the bimetallic nanoadsorbent ((TiO₂@MnO₂)-NPs) obtained from the biosynthesis in the mercury ions (Hg²⁺) removal by adsorption. (TiO₂@MnO₂)-NPs was synthesized from Aloe vera and Matricaria recutita extracts. The nanoadsorbent was characterized by XRD, ZP, and pH_ZCP. The results confirmed the production of a nanoadsorbent with an average particle diameter around 25?nm. (TiO₂@MnO₂)-NPs showed negative surface charge (??11.32?mV), and pH_ZCP?≈?7.65. Regarding Hg²⁺ adsorption, the removal was 86.15%. Adsorption data were fitted by Khan (R² 0.96, q_e?=?28.07?mg?g^?1) and intraparticle diffusion (R² 0.97, q_t?=?28.84?mg?g^?1) models. Thermodynamics suggested the adsorption is exothermic process (ΔH?=???73.93?kJ?mol^?1), with decrease of the randomness (ΔS?=?0.24?kJ?mol^?1?K^?1) in the solid–liquid interface, being favorable under temperature below 298.15?K (ΔG?=???1.16?kJ?mol^?1). (TiO₂@MnO₂)-NPs resulted in more than 80% Hg²⁺ removal after six cycles of adsorption. Therefore, nanoparticles containing titanium and manganese can be effectively used for the adsorption of Hg²⁺ ions, collaborating with the environment.

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利用(TiO2@MnO2)-NPs纳米复合材料吸附去除Hg2+离子

被无机汞污染的废水被认为是一个严重的环境问题，主要是因为这种污染物对人类健康造成有害影响。因此，本研究旨在评价生物合成获得的双金属纳米吸附剂(TiO2@MnO2)-NPs)在吸附去除汞离子(Hg2+)中的潜力。(TiO2@MnO2)-NPs是由芦荟和苦参提取物合成的。采用XRD、ZP和pHZCP对纳米吸附剂进行了表征。结果表明，制备的纳米吸附剂的平均粒径约为25nm。(TiO2@MnO2)-NPs表面电荷为负(11.32 mV)， pHZCP≈7.65。对Hg2+的吸附率为86.15%。吸附数据采用Khan模型(R2 0.96, qe = 28.07 mg g 1)和颗粒内扩散模型(R2 0.97, qt = 28.84 mg g 1)拟合。热力学结果表明，吸附过程为放热过程(ΔH?= 73.93?kJ?mol?1)，吸附过程的随机性降低(ΔS?= 0.24?kJ?mol?1?K?1)，温度低于298.15?K(ΔG ? = ? ? 1.16 kJ ?摩尔? 1)。(TiO2@MnO2)-NPs经过6次循环吸附后，Hg2+去除率超过80%。因此，含有钛和锰的纳米颗粒可以有效地用于吸附Hg2+离子，与环境协同作用。

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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).