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首页> 外文期刊>Nanotechnology >Immobilization of mercury in field soil and sediment using carboxymethyl cellulose stabilized iron sulfide nanoparticles
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Immobilization of mercury in field soil and sediment using carboxymethyl cellulose stabilized iron sulfide nanoparticles

机译：使用羧甲基纤维素稳定的硫化铁纳米颗粒固定农田土壤和沉积物中的汞

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Mercury (Hg) is one of the most pervasive and bio-accumulative metals in the environment. Yet, effective insitu remediation technologies have been lacking. This study investigated the effectiveness of a class of soil-deliverable FeS nanoparticles for insitu immobilization of Hg in two field-contaminated soils from a New Jersey site and one sediment from an Alabama site. The nanoparticles were prepared using sodium carboxymethyl cellulose (CMC) as a stabilizer. Transmission electron microscopy measurements revealed a particle size of 34.3±8.3nm (standard deviation), whereas dynamic light scattering gave a hydrodynamic diameter of 222.5±3.2nm. Batch tests showed that at an FeS-to-Hg molar ratio of 28:1-118:1, the nanoparticles reduced water-leachable Hg by 79%-96% and the TCLP (toxicity characteristic leaching procedure) based leachability by 26%-96%. Column breakthrough tests indicated that the nanoparticles were deliverable in the sediment/soil columns under moderate injection pressure. However, once the external pressure was removed, the delivered nanoparticles remained virtually mobile under typical groundwater flow conditions. When the Hg-contaminated soil and sediment were treated with 52-95 pore volumes of a 500mgl ~1 FeS nanoparticle suspension, water-leachable Hg was reduced by 90%-93% and TCLP-leachable Hg was reduced by 65%-91%. The results warrant further field demonstration of this promising insitu remediation technology.
机译：汞（Hg）是环境中最普遍和生物富集的金属之一。然而，一直缺乏有效的原位修复技术。这项研究调查了一类土壤可输送的FeS纳米粒子在将汞固定在新泽西州两处被现场污染的土壤和阿拉巴马州一处沉积物中的汞中的有效性。使用羧甲基纤维素钠（CMC）作为稳定剂制备纳米颗粒。透射电子显微镜测量显示出34.3±8.3nm（标准偏差）的粒径，而动态光散射给出的流体力学直径为222.5±3.2nm。分批测试表明，在FeS / Hg摩尔比为28：1-118：1的情况下，纳米颗粒将可水浸出的Hg降低了79％-96％，而基于TCLP（毒性特征浸出程序）的浸出率降低了26％- 96％。柱穿透试验表明，在中等进样压力下，纳米颗粒可在沉积物/土壤柱中传输。但是，一旦消除了外部压力，在典型的地下水流条件下，输送的纳米颗粒实际上仍然可以移动。用500mgl〜1 FeS纳米颗粒悬浮液的52-95孔体积处理受Hg污染的土壤和沉积物时，水溶出的Hg减少90％-93％，TCLP溶出的Hg减少65％-91％ 。结果证明了该有前途的现场修复技术的进一步现场演示。

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