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首页> 外文期刊>Journal of Hazardous Materials >Immobilization of methylene blue onto bentonite and its application in the extraction of mercury (II)
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Immobilization of methylene blue onto bentonite and its application in the extraction of mercury (II)

机译：亚甲基蓝在膨润土上的固定化及其在汞萃取中的应用

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摘要

Methylene blue was immobilized onto bentonite (BNT). The modified clay (MB-BNT) was used to extract Hg~(2+) at pH 6.0 yielding Hg-MB-BNT. BNT. MB-BNT and Hg-MB-BNT were characterized by X-ray diffractometry, infrared spectra, and elemental and thermogravimetric analyses. MB is suggested to be intercalated into the major phase of BNT; montmorillonite mineral (MMT), lying parallel to the aluminosilicate layers, with a capacity of 36mequiv./100g. MB-BNT shows good stability in 0.1-1 M hydrochloric or nitric acids, ammonium hydroxide, and concentrated Na~+, K~+ or NH_4~+ chlorides or iodides. It shows good selectivity towards Hg~(2+) with an extraction capacity of 37 mequiv./100g in the presence of I~- giving rise to a ratio of MB/Hg~(2+)/I~-1:1:3 in the clay phase. Extracted Hg~(2+) could be quantitatively recovered by ammonia buffer at pH 8.5. MB-BNT was successfully applied to recover Hg~(2+) from spiked natural water and cinnabar mineral samples using the optimum conditions; pH 6.0, time of stirring 10 min and 10 mL of 0.05 M NH_4Cl/NH_4OH at pH 8.5 as eluent.
机译：亚甲基蓝固定在膨润土（BNT）上。用改性粘土（MB-BNT）在pH 6.0下提取Hg〜（2+），得到Hg-MB-BNT。 BNT。 MB-BNT和Hg-MB-BNT通过X射线衍射，红外光谱以及元素和热重分析进行表征。建议将MB插入BNT的主要阶段；平行于铝硅酸盐层的蒙脱石矿物（MMT），容量为36mequiv./100g。 MB-BNT在0.1-1 M的盐酸或硝酸，氢氧化铵以及浓的Na〜+，K〜+或NH_4〜+氯化物或碘化物中显示出良好的稳定性。它在I〜-存在下对Hg〜（2+）表现出良好的选择性，萃取容量为37 mequiv./100g，导致MB / Hg〜（2 +）/ I〜-1：1的比率： 3在粘土相中。提取的Hg〜（2+）可通过pH 8.5的氨水缓冲液定量回收。 MB-BNT在最佳条件下成功地用于从加标的天然水和朱砂矿物样品中回收Hg〜（2+）； pH 6.0，搅拌时间10分钟和10 mL pH 8.5的0.05 M NH_4Cl / NH_4OH作为洗脱液。

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