Removal of trace amount of metal ions using magnetic graphene oxide
使用磁性氧化石墨烯去除微量金属离子
基本信息
- 批准号:445345-2012
- 负责人:
- 金额:$ 8.33万
- 依托单位:
- 依托单位国家:加拿大
- 项目类别:Collaborative Research and Development Grants
- 财政年份:2015
- 资助国家:加拿大
- 起止时间:2015-01-01 至 2016-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Selenium and other trace metals are widely distributed in sulfide minerals and coal ash. During mining and mineral processing, selenium could be released into water and soils, and further transferred to organisms and their life cycles. Selenium is an essential trace nutrient, but has an adverse effect at higher concentrations. A guideline value of less than 0.04 mg/L (40 microgram/L or 40ppb) selenium in drinking-water has been set by the World Health Organization. The removal of selenium and other trace metals from water systems is crucial to reduce their environmental impact and maintain sustainable development of natural resources. Selenium is metalloid and has variable valence states from -2 to +6. The selenium species present in water are mainly oxyanions of selenate and selenite, which are more mobile than elemental selenium (Se) and selenide (Se2-).
In this proposed research, a new kind of adsorbent, magnetic graphene oxide (MGO) composites will be synthesized to investigate the removal of selenium species in conjunction with the application of an external magnetic field. We propose to combine the magnetic carrier technology with the high specific surface area MGO for the removal of selenium oxyanions and other metal ions in from water. After the magnetic separation, MGO will be recycled and reused by stripping off the adsorbed selenium and trace metals. Our preliminary results show that MGO has a good removal rate for both Se (IV) and Se (VI). The large surface area, large adsorption capacity, and high water dispersibility of MGO make it a promising adsorbent for use in wastewater.
硒等痕量金属广泛分布于硫化物矿物和火山灰中。在采矿和选矿过程中,硒可以被释放到水和土壤中,并进一步转移到生物体及其生命周期中。硒是一种必需的微量营养素,但在较高浓度时会产生不利影响。世界卫生组织将饮用水中的硒含量控制在0.04毫克/L(40微克/L或40 ppb)以下。从水系统中去除硒和其他痕量金属对于减少其对环境的影响和维持自然资源的可持续发展至关重要。硒是类金属,价态从-2到+6变化。水中存在的硒主要是亚硒酸盐和亚硒酸盐的含氧阴离子,它们比元素硒(Se)和硒(Se2-)更具流动性。
在这项拟议的研究中,将合成一种新型的吸附剂-磁性氧化石墨烯(MGO)复合材料,以研究在外加磁场的作用下对硒物种的去除。我们建议将磁性载体技术与高比表面积氧化镁相结合,以去除水中的硒、氧离子和其他金属离子。磁选后,通过剥离吸附的硒和痕量金属,将氧化镁回收再利用。初步结果表明,氧化镁对Se(IV)和Se(VI)均有较好的去除效果。氧化镁具有较大的比表面积、较大的吸附容量和较高的水分散性,是一种很有前途的废水处理吸附剂。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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- DOI:
10.3390/molecules28114417 - 发表时间:
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- DOI:
10.1021/am5007113 - 发表时间:
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- DOI:
10.1021/acs.jpcc.9b07632 - 发表时间:
2020-01-09 - 期刊:
- 影响因子:3.7
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Highly Stable and Efficient Catalyst with In Situ Exsolved Fe-Ni Alloy Nanospheres Socketed on an Oxygen Deficient Perovskite for Direct CO2 Electrolysis
- DOI:
10.1021/acscatal.6b01555 - 发表时间:
2016-09-01 - 期刊:
- 影响因子:12.9
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Evaluation of wettability of mineral particles via cavitation thresholds
- DOI:
10.1016/j.powtec.2019.11.069 - 发表时间:
2020-02-15 - 期刊:
- 影响因子:5.2
- 作者:
Chen, Yuran;Chang, Jing;Liu, Qingxia - 通讯作者:
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Liu, Qingxia的其他文献
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{{ truncateString('Liu, Qingxia', 18)}}的其他基金
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