范文宏,
曾佩,
卢惠婷,
刘莹莹,
李晓敏
北京航空航天大学空间与环境学院, 北京 100191

作者简介: 范文宏(1971-),女,环境科学博士,教授,研究方向为纳米材料毒理学、环境污染化学、环境生物地球化学和环境毒理学,E-mail:fanwh@buaa.edu.cn.

基金项目: 国家自然科学基金项目(51378041)


中图分类号: X171.5

Effects of Five TiO₂ Nanoparticles with Different Crystalline Phases on the Bioaccumulation of Metallic Copper

Fan Wenhong,
Zeng Pei,
Lu Huiting,
Liu Yingying,
Li Xiaomin
School of Space and Environment, Beihang University, Beijing 100191, China

CLC number: X171.5

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摘要:纳米二氧化钛(nTiO₂)作为一种具有独特物理化学性质的纳米材料被广泛应用。然而，在生产、使用的过程中，nTiO₂会不可避免地进入于水环境中。重金属是水体中常见的污染物之一，nTiO₂进入水体后是否会与水体中的重金属发生相互作用，进而影响重金属的生物积累，目前相关报道还很少。本论文以大型溞为模式生物，考察了5种不同晶型nTiO₂对常见的重金属铜生物积累影响。结果表明，nTiO₂对Cu²⁺的吸附降低了试验液中Cu²⁺浓度。但5种不同晶型nTiO₂的吸附能力并不一样，其中锐钛矿晶型(A-S)的吸附能力最高，这可能是由于结构缺陷和表面羟基的存在，为Cu²⁺提供了更多的结合位点，从而提高了A-S的吸附能力。nTiO₂的存在降低了金属铜在大型溞体内的积累，这可能是由于nTiO₂对金属铜的吸附，降低了自由Cu²⁺的生物可利用性。由于nTiO₂样品之间比表面积的差异，不同晶型之间单位nTiO₂引起的铜积累有显著性差异性(P<0.05)，其中锐钛矿和金红石之比为4:1混合晶型 (M1)最高，A-S最低。
关键词: 纳米二氧化钛/
金属铜/
大型溞/
积累量/
晶型

Abstract:Due to its physicochemical property, the nano-titanium dioxide (nTiO₂) is widely utilized. Definitely, the nTiO₂ is released in the aquatic environment during its life cycle (such as production, use and waste). The heavy metals are typical contaminants in aquatic environment, but the influence from nTiO₂ on heavy metal, as well as impact on bioaccumulation of heavy metals remains uncertain. In this study, the Daphnia magna was selected as the case to address the influence from different crystalline phases of nTiO₂ on the bioaccumulation of copper. The results showed that nTiO₂ reduced the concentrations of Cu²⁺ in the test solution. Meanwhile, the copper adsorption capacities of the five crystalline nTiO₂ were different, among which anatase (A-S) was observed with the highest adsorption capacity. This may be explained by the fact that the presence of structural defects and surface hydroxyl groups of A-S can provide more binding sites for Cu²⁺ and correspondingly increase the adsorption capacity of A-S. On another aspect, in our study, the nTiO₂ particles reduced the accumulation of copper in D. magna, since the adsorption of Cu by nTiO₂ probably minimize the bioavailability of free copper ions. Also, as the variability of surface areas, the significant differences for the Cu accumulation per nTiO₂ were observed amongst the five nTiO₂ (P<0.05). In particular, the Cu accumulation for the 4:1 mixture of anatase/rutile (M1) was the highest, whilst that for the A-S was the lowest.
Key words:nano-titanium dioxide/
metallic copper/
Daphnia magna/
accumulation/
crystalline phases.