College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071, China.
Environ Sci Process Impacts. 2014 May;16(6):1462-8. doi: 10.1039/c4em00096j.
Nano-sized nickel oxide (nano-NiO) is a new nanomaterial that has shown great promise in many areas of application. Understanding its environmental fate and effects is critical for minimizing the potential environmental implications of this new material due to incidental and accidental releases in the future. In this study, we observed strong adsorption of tetracycline to nano-NiO and found that the adsorption affinity can be further enhanced by Cu(ii) ions - the observed distribution coefficient (Kd) values are 10(3.1) to 10(4.2) L kg(-1) in the absence of Cu(ii) and 10(3.0) to 10(5.5) L kg(-1) in the presence of Cu(ii); such adsorption affinities are even comparable to those of tetracycline to carbonaceous materials. The strong adsorptive affinities of nano-NiO for tetracycline are likely attributable to several mechanisms, including surface complexation, cation exchange, and electrostatic attraction. As a strong complexing agent, Cu(ii) can significantly enhance adsorption of tetracycline by serving as a bridging agent between tetracycline and nano-NiO. The findings of this study have important implications for the risk assessment of engineered nanomaterials - in aquatic environments nano-NiO (and likely other metal oxide nanomaterials) can strongly adsorb tetracycline antibiotics, resulting in the changes of environmental risks of the metal oxide nanomaterials and/or bioavailability of the adsorbed contaminants.
纳米氧化镍（nano-NiO）是一种新型纳米材料，在许多应用领域都显示出巨大的应用前景。了解其环境归宿和效应对于最小化这种新材料在未来偶然和意外释放时可能对环境造成的影响至关重要。在这项研究中，我们观察到四环素强烈吸附到纳米氧化镍上，并发现铜（II）离子可以进一步增强吸附亲和力——在不存在铜（II）的情况下，观察到的分配系数（Kd）值为 10(3.1) 至 10(4.2) L kg(-1)，而在存在铜（II）的情况下，Kd 值为 10(3.0) 至 10(5.5) L kg(-1)；这种吸附亲和力甚至可与碳质材料对四环素的亲和力相媲美。纳米氧化镍对四环素具有很强的吸附亲和力，这可能归因于几种机制，包括表面络合、阳离子交换和静电吸引。作为一种强络合剂，铜（II）可以通过充当四环素和纳米氧化镍之间的桥接剂，显著增强四环素的吸附。本研究的结果对于工程纳米材料的风险评估具有重要意义——在水生环境中，纳米氧化镍（以及可能其他金属氧化物纳米材料）可以强烈吸附四环素抗生素，从而改变金属氧化物纳米材料的环境风险和/或吸附污染物的生物可利用性。
