Influence of pH, competing ions, and salinity on the sorption of strontium and cobalt onto biogenic hydroxyapatite.
Influence of pH, competing ions, and salinity on the sorption of strontium and cobalt onto biogenic hydroxyapatite.
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DOI：
10.1038/srep23361
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发表时间：
2016-03-18
影响因子：
4.6
通讯作者：
Macaskie LE
中科院分区：
文献类型：
--
作者：
Handley-Sidhu S;Mullan TK;Grail Q;Albadarneh M;Ohnuki T;Macaskie LE
人为放射性核素因核活动而污染一系列环境，例如废物储存罐/池的泄漏（如美国汉福德或英国塞拉菲尔德场址）或大规模核事故（如乌克兰切尔诺贝利或日本福岛）。污染沃茨最广泛应用的补救技术之一是使用吸附材料（例如沸石和磷灰石）。然而，核污染场地的一个关键问题是对复杂化学环境中放射性核素的补救。在这项研究中，生物羟基磷灰石（BHAP）产生的沙雷氏菌属细菌的潜力，以修复替代放射性核素（Sr 2+和Co 2+）从环境相关的沃茨通过改变pH值，盐度和阳离子的类型和浓度存在。在测试的溶液中，BHAP对Sr 2+和Co 2+的吸附能力高于合成产生的羟基磷灰石（HAP）。BHAP还与天然沸石（用于工业去污）相比，有利于从盐水沃茨中吸收Sr 2+和Co 2+。结果证实，羟基磷灰石矿物的高表面积和无定形磷酸钙含量，典型的生物源，是合适的修复或反应性屏障材料，用于修复复杂的污染环境或废水。
Anthropogenic radionuclides contaminate a range of environments as a result of nuclear activities, for example, leakage from waste storage tanks/ponds (e.g. Hanford, USA or Sellafield sites, UK) or as a result of large scale nuclear accidents (e.g. Chernobyl, Ukraine or Fukushima, Japan). One of the most widely applied remediation techniques for contaminated waters is the use of sorbent materials (e.g. zeolites and apatites). However, a key problem at nuclear contaminated sites is the remediation of radionuclides from complex chemical environments. In this study, biogenic hydroxyapatite (BHAP) produced by Serratia sp. bacteria was investigated for its potential to remediate surrogate radionuclides (Sr2+ and Co2+) from environmentally relevant waters by varying pH, salinity and the type and concentration of cations present. The sorption capacity of the BHAP for both Sr2+ and Co2+ was higher than for a synthetically produced hydroxyapatite (HAP) in the solutions tested. BHAP also compared favorably against a natural zeolite (as used in industrial decontamination) for Sr2+ and Co2+ uptake from saline waters. Results confirm that hydroxyapatite minerals of high surface area and amorphous calcium phosphate content, typical for biogenic sources, are suitable restoration or reactive barrier materials for the remediation of complex contaminated environments or wastewaters.