Adsorption Performance and Mechanism of Cu2+ Adsorption from Aqueous Solution by Olivine Loaded with Magnesium Oxide Micro Rods

IF 3.8 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Water, Air, & Soil Pollution Pub Date : 2025-04-18 DOI:10.1007/s11270-025-07981-5

Linyuan Zhou, Shuqin Zhang, Kanrui Zhang, Dajun Ren, Xiaoqing Zhang

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Abstract

Olivine is a natural material with abundant reserves and is considered to have the potential to treat heavy metal ions in water. In this study, a facile precipitation-calcination method was employed to deposit micrometer-sized magnesium oxide (MgO) rods onto the surface of olivine powder (PO). This process yielded a cost-effective MgO-modified olivine composite (MgO@PO400), which was subsequently evaluated for its ability to adsorb Cu²⁺ from aqueous solutions. The BET-specific surface area of MgO@PO400 was three times higher than that of PO, and the MgO micro-rods were distributed on the material's surface (BET:Brunauer-Emmet-Teller). Adsorption experiments showed that the data fitted well with the pseudo-second-order kinetic model and the Langmuir isotherm model, which indicated that Cu²⁺ was removed by monolayer chemisorption. In addition, the process was verified to be spontaneous and thermodynamically favorable. The maximum adsorption capacity of MgO@PO400 for Cu²⁺ was 225.82 mg/g, which was able to exhibit high removal efficiency (84.95–98.05%) for Cu²⁺ in the pH range of 3 to 5.5, and good immunity to the presence of different coexisting ions in the water, demonstrating that potential for treating complex Cu2⁺-containing wastewater. Various characterization methods verified the adsorption mechanism of MgO@PO400 on Cu²⁺, and the results showed that the removal of Cu²⁺ mainly involved ion exchange, surface precipitation and electrostatic attraction. Therefore, MgO@PO400 can be considered a potential adsorbent for removing Cu²⁺ from aqueous solutions.

Graphical Abstract

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载氧化镁微棒橄榄石对水溶液中Cu2+的吸附性能及机理

橄榄石是一种储量丰富的天然材料，被认为具有处理水中重金属离子的潜力。本研究采用易沉淀-煅烧法在橄榄石粉（PO）表面沉积微米级氧化镁棒（MgO）。该工艺产生了一种具有成本效益的氧化镁改性橄榄石复合材料（MgO@PO400），随后对其从水溶液中吸附Cu2+的能力进行了评估。MgO@PO400的BET比表面积是PO的3倍，MgO微棒分布在材料表面（BET:Brunauer-Emmet-Teller）。吸附实验表明，所得数据符合拟二级动力学模型和Langmuir等温线模型，表明Cu2+是通过单层化学吸附去除的。此外，该过程被证实是自发的和热力学有利的。MgO@PO400对Cu2+的最大吸附量为225.82 mg/g，在pH为3 ~ 5.5的范围内对Cu2+具有较高的去除率（84.95 ~ 98.05%），且对水中不同共存离子具有良好的免疫力，显示出处理含Cu2+复合废水的潜力。各种表征方法验证了MgO@PO400对Cu2+的吸附机理，结果表明，对Cu2+的去除主要涉及离子交换、表面沉淀和静电吸引。因此，MgO@PO400可以被认为是从水溶液中去除Cu2+的潜在吸附剂。图形抽象

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来源期刊

Water, Air, & Soil Pollution 环境科学-环境科学

CiteScore

4.50

自引率

6.90%

发文量

448

审稿时长

2.6 months

期刊介绍： Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments. Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation. Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.