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Magnesium Oxide Embedded Nitrogen Self-Doped Biochar Composites: Fast and High-Efficiency Adsorption of Heavy Metals in an Aqueous Solution
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-08-14 00:00:00 , DOI: 10.1021/acs.est.7b02382 Li-Li Ling 1 , Wu-Jun Liu 1 , Shun Zhang 1 , Hong Jiang 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-08-14 00:00:00 , DOI: 10.1021/acs.est.7b02382 Li-Li Ling 1 , Wu-Jun Liu 1 , Shun Zhang 1 , Hong Jiang 1
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Lead (Pb) pollution in natural water bodies is an environmental concern due to toxic effects on aquatic ecosystems and human health, while adsorption is an effective approach to remove Pb from the water. Surface interactions between adsorbents and adsorbates play a dominant role in the adsorption process, and properly engineering a material’s surface property is critical to the improvement of adsorption performance. In this study, the magnesium oxide (MgO) nanoparticles stabilized on the N-doped biochar (MgO@N-biochar) were synthesized by one-pot fast pyrolysis of an MgCl2-loaded N-enriched hydrophyte biomass as a way to increase the exchangeable ions and N-containing functional groups and facilitate the adsorption of Pb2+. The as-synthesized MgO@N-biochar has a high performance with Pb in an aqueous solution with a large adsorption capacity (893 mg/g), a very short equilibrium time (<10 min), and a large throughput (∼4450 BV). Results show that this excellent adsorption performance can be maintained with various environmentally relevant interferences including pH, natural organic matter, and other metal ions, suggesting that the material may be suitable for the treatment of wastewater, natural bodies of water, and even drinking water. In addition, MgO@N-biochar quickly and efficiently removed Cd2+ and tetracycline. Multiple characterizations and comparative tests have been performed to demonstrate the surface adsorption and ion exchange contributed to partial Pb adsorption, and it can be inferred from these results that the high performance of MgO@N-biochar is mainly due to the surface coordination of Pb2+ and C═O or O═C–O, pyridinic, pyridonic, and pyrrolic N. This work suggests that engineering surface functional groups of biochar may be crucial for the development of high performance heavy metal adsorbents.
中文翻译：
氧化镁嵌入的氮自掺杂生物炭复合材料：水溶液中重金属的快速高效吸附
由于对水生生态系统和人类健康的毒性影响，天然水体中的铅（Pb）污染是环境问题，而吸附是从水中去除Pb的有效方法。吸附剂和被吸附物之间的表面相互作用在吸附过程中起着主要作用，正确设计材料的表面性质对于提高吸附性能至关重要。在这项研究中，通过一锅快速热解MgCl 2的富氮水生植物生物质来合成稳定在N掺杂生物炭（MgO @ N-biochar）上的氧化镁（MgO）纳米颗粒，作为增加Ng的水生植物生物量的一种方法。可交换离子和含氮官能团，促进Pb 2+的吸附。刚合成的MgO @ N-生物炭在水溶液中具有高的Pb吸附能力（893 mg / g），很短的平衡时间（<10分钟）和大的通量（〜4450 BV） ）。结果表明，在各种环境相关干扰（包括pH值，天然有机物和其他金属离子）下，都可以保持这种出色的吸附性能，这表明该材料可能适用于废水，天然水体甚至饮用水的处理。此外，MgO @ N-生物炭可快速有效地去除Cd 2+和四环素。进行了多种表征和对比试验，证明了表面吸附和离子交换对部分Pb的吸附有贡献，从这些结果可以推断出MgO @ N-生物炭的高性能主要归因于Pb 2的表面配位。+和C═O或O═C–O，吡啶二酮，吡啶酮和吡咯N。这项工作表明，生物炭的工程表面官能团可能对开发高性能重金属吸附剂至关重要。
更新日期：2017-08-15
中文翻译：
氧化镁嵌入的氮自掺杂生物炭复合材料：水溶液中重金属的快速高效吸附
由于对水生生态系统和人类健康的毒性影响，天然水体中的铅（Pb）污染是环境问题，而吸附是从水中去除Pb的有效方法。吸附剂和被吸附物之间的表面相互作用在吸附过程中起着主要作用，正确设计材料的表面性质对于提高吸附性能至关重要。在这项研究中，通过一锅快速热解MgCl 2的富氮水生植物生物质来合成稳定在N掺杂生物炭（MgO @ N-biochar）上的氧化镁（MgO）纳米颗粒，作为增加Ng的水生植物生物量的一种方法。可交换离子和含氮官能团，促进Pb 2+的吸附。刚合成的MgO @ N-生物炭在水溶液中具有高的Pb吸附能力（893 mg / g），很短的平衡时间（<10分钟）和大的通量（〜4450 BV） ）。结果表明，在各种环境相关干扰（包括pH值，天然有机物和其他金属离子）下，都可以保持这种出色的吸附性能，这表明该材料可能适用于废水，天然水体甚至饮用水的处理。此外，MgO @ N-生物炭可快速有效地去除Cd 2+和四环素。进行了多种表征和对比试验，证明了表面吸附和离子交换对部分Pb的吸附有贡献，从这些结果可以推断出MgO @ N-生物炭的高性能主要归因于Pb 2的表面配位。+和C═O或O═C–O，吡啶二酮，吡啶酮和吡咯N。这项工作表明，生物炭的工程表面官能团可能对开发高性能重金属吸附剂至关重要。
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