Structure-Controlled Synthesis of Sodium Trititanate and Hexatitanate Nanorods and their Adsorption Properties for Ni2+and Pb2+ Ions from Aqueous Solutions

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

Water, Air, & Soil Pollution Pub Date : 2024-10-08 DOI:10.1007/s11270-024-07531-5

Chaochao Hao, Aili Wang, Hengbo Yin

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Abstract

Phase pure sodium trititanate (Na₂Ti₃O₇) and hexatitanate (Na₂Ti₆O₁₃) nanorods were controllably synthesized using sodium carbonate and titanic acid as sodium and titanium precursors by calcination at 850 °C for 12 h. The adsorption properties of trititanate and hexatitanate nanorods for the removal of heavy metal ions, Ni²⁺ and Pb²⁺ from simulated wastewaters at pH of 3‒7 and 20‒65 °C were investigated. The adsorption of Ni²⁺ and Pb²⁺ ions on sodium trititanate and hexatitanate nanorods are through ion exchange and electrostatic adsorption. The adsorption of Ni²⁺ and Pb²⁺ ions could be well fitted by the pseudo-second order adsorption kinetics and Langmuir adsorption isotherm. Based on the Langmuir adsorption isotherm, the adsorption capacities of naked sodium trititanate nanorods for Ni²⁺ and Pb²⁺ from simulated wastewaters at 20 °C and pH 7 are 104.17 and 89.85 mg∙g^‒1 while the adsorption capacities of naked sodium hexatitanate nanorods are 95.69 and 76.69 mg∙g^‒1, respectively. Sodium trititanate nanorods exhibit higher adsorption capacities for heavy metal ions from wastewaters than sodium hexatitanate nanorods because the former has richer Na⁺ ions for ion exchange with heavy metal ions than the latter. The adsorption processes of Ni²⁺ and Pb²⁺ on sodium trititanate and hexatitanate nanorods are spontaneous. The phase pure sodium titanate nanorods may have practical application for the removal and enrichment of metal ions from wastewaters.

Graphical Abstract

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结构控制合成三钛酸钠和六钛酸钠纳米棒及其对水溶液中 Ni2+ 和 Pb2+ 离子的吸附性能

以碳酸钠和钛酸为钠和钛前驱体，在850 ℃下煅烧12 h，可控地合成了相纯的三钛锆酸钠（Na2Ti3O7）和六钛锆酸钠（Na2Ti6O13）纳米棒。三钛酸钠和六钛酸钠纳米棒对 Ni2+ 和 Pb2+ 离子的吸附是通过离子交换和静电吸附实现的。Ni2+和Pb2+离子的吸附可以很好地与伪二阶吸附动力学和Langmuir吸附等温线拟合。根据 Langmuir 吸附等温线，在 20 °C 和 pH 值为 7 的条件下，裸纳米三钛酸钠对模拟废水中 Ni2+ 和 Pb2+ 的吸附容量分别为 104.17 和 89.85 mg∙g-1，而裸纳米六钛酸钠的吸附容量分别为 95.69 和 76.69 mg∙g-1。三钛酸钠纳米棒对废水中重金属离子的吸附容量高于六钛酸钠纳米棒，这是因为前者比后者有更丰富的 Na+ 离子与重金属离子进行离子交换。三钛酸钠和六钛酸钠纳米棒对 Ni2+ 和 Pb2+ 的吸附过程是自发的。相纯的钛酸钠纳米棒可用于去除和富集废水中的金属离子。

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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.