• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Aqueous nickel sequestration and release during structural Fe(ii) hydroxide remediation: the roles of coprecipitation, reduction and substitution
【24h】

Aqueous nickel sequestration and release during structural Fe(ii) hydroxide remediation: the roles of coprecipitation, reduction and substitution

机译：结构Fe（II）氢氧化物修复期间含水镍封存和释放：共沉淀，减少和取代的作用

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Aqueous Ni ~(2+) removal by structural Fe( II ) hydroxides (SFH) under well-controlled experimental conditions was investigated in this study, and a possible mechanism for Ni ~(2+) release from solid products was revealed. Experiments with SFH and Ni ~(2+) showed the excellent reactivity of SFH towards aqueous Ni ~(2+) when the molar ratio of [Fe( II )]/[OH ~(?) ] was below 1?:?2. The reaction started with adsorption and precipitation of Ni ~(2+) , followed by reduction of Ni( II ) and substitution of Fe( II ) with the formation of Ni( II )/Fe( III ) layered double hydroxides. However, at long reaction time, Ni( II ) release from Ni(OH) _(2) and Ni _( x ) Fe _((1? x )) (OH) _(2) precipitates was observed due to the delivery of dissolved Fe ~(2+) and Fe ~(3+) , which were determined to substitute Ni( II ) by forming Fe(OH) _(2) , Fe(OH) _(3) and Fe ~(III) _((1+2 x /3)) Fe ~(II) _((1? x )) (OH) _(5) . The presence of O _(2) and NO _(3) ~(?) reduced the removal efficiency of Ni ~(2+) and promoted its release by consuming Fe( II ) and promoting Fe ~(3+) delivery. However, CO _(3) ~(2?) and PO _(4) ~(3?) might enhance the removal of Ni ~(2+) and inhibit its release. For wastewater containing a high Ni ~(2+) concentration, using SFH is also beneficial to Ni ~(2+) recycling, as removed Ni( II ) could be released and enriched, followed by future utilization.
机译：在本研究中研究了在良好控制的实验条件下由结构Fe（II）氢氧化物（SFH）除去的Ni〜（2+）除去，并揭示了来自固体产物的Ni〜（2+）释放的可能机制。 SFH和Ni〜（2+）的实验表明，当[Fe（II）] / [OH〜（α）]的摩尔比在1？：2时，当[Fe（II）] / [OH〜（β）]的摩尔比表示时，SFH朝向水性Ni〜（2+）的优异反应性。：？2 。反应开始于Ni〜（2+）的吸附和沉淀，然后减少Ni（II）并用Fe（II）取代Ni（II）/ Fe（III）层双氢氧化物。但是，在长反应时间下，Ni（II）释放来自Ni（OH）_（2）和Ni _（x）Fe _（（1×x））（OH）_（2）沉淀物由于递送而观察到溶解的Fe〜（2+）和Fe〜（3+），通过形成Fe（OH）_（2），Fe（OH）_（3）和Fe〜（iii）来确定替代Ni（II）（II） _（（1 + 2 x / 3））fe〜（ii）_（（1？x））（OH）_（5）。 O _（2）和NO _（3）〜（α）的存在降低了Ni〜（2+）的去除效率，并通过消耗Fe（II）和促进Fe〜（3+）递送促进其释放。然而，CO _（3）〜（2？）和PO _（4）〜（3？）可能增强Ni〜（2+）的去除并抑制其释放。对于含有高Ni〜（2+）浓度的废水，使用SFH也有益于Ni〜（2+）回收，因为除去的Ni（II）可以释放并富集，然后进行未来的利用率。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号