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首页> 外文期刊>RSC Advances >From spent dye-loaded palygorskite to a multifunctional palygorskite/carbon/Ag nanocomposite
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From spent dye-loaded palygorskite to a multifunctional palygorskite/carbon/Ag nanocomposite

机译：从用过的染料加载坡缕石到多功能坡缕石/碳/银纳米复合材料

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Palygorskite (PAL) has been widely used for adsorption removal of dyes from wastewater, but the dyeloaded PAL is usually discharged as solid waste because it is hardly regeneratable by conventional elution processes. As the aim was to efficiently utilize the dye-loaded PAL waste, we employed a facile one-pot hydrothermal process to transform the spent methyl violet (MV)-loaded PAL into multifunctional ternary palygorskite/carbon/Ag nanoparticles (PAL/C/AgNPs) nanocomposites in the assistance of AgNO3. The MV-loaded PAL serves as a carbon precursor, reducer of Ag(I) and supporter of the in situ formed AgNPs. Structure characterizations confirmed that the MV dye was transformed into carbon species, and AgNPs were formed on the PAL with good dispersion, and the addition of Ag(I) ions promoted carbonization of the MV molecules. The as-prepared nanocomposites exhibited excellent adsorption and catalytic performance. Adsorption evaluation showed that the nanocomposite prepared at 5 mass% of AgNO3 dosage gives the best adsorption properties, and 99.2% of methylene blue (MB), 86.9% of MV, 68.7% of chlortetracycline hydrochloride (CTC) and 46.2% of tetracyclines (TC) were rapidly removed from 100 mg L-1 of the aqueous solution using 0.5 g L-1 of the adsorbent. The removal ratio increased with increasing dosage of adsorbent, and the minimum usage amounts of adsorbent for the thorough removal of MB, MV, CTC and TC molecules were 1.0 g L-1, 1.2 g L-1, 3.5 g L-1 and 4.5 g L-1, respectively. Moreover, the nanocomposites could rapidly catalyze the conversion of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) within 6.5 min with a catalytic rate constant of 0.0120 s(-1), and the catalytic activity is still retained after 8 cycles of reuse. In addition, the nanocomposite can be regenerated into new adsorbents by the same hydrothermal process after adsorption of organic matters, which open a new sustainable avenue to efficiently utilize waste dye-loaded PAL and develop new adsorption and catalysis materials.
机译：坡缕石（PAL）已被广泛用于吸附去除废水中的染料，但是载有染料的PAL通常作为固体废物排放，因为它很难通过常规洗脱方法再生。为了有效利用载有染料的PAL废料，我们采用了一种简便的一锅水热工艺，将用过的装满甲基紫（MV）的PAL转化为多功能三元凹凸棒石/碳/银纳米颗粒（PAL / C / AgNPs ）在AgNO3的帮助下形成纳米复合材料。加载了MV的PAL用作碳前驱体，Ag（I）的还原剂和原位形成的AgNP的载体。结构表征证实，MV染料已转化为碳原子，并且在PAL上形成了具有良好分散性的AgNP，并且Ag（I）离子的加入促进了MV分子的碳化。所制备的纳米复合材料表现出优异的吸附和催化性能。吸附评估表明，以5％的AgNO3量制备的纳米复合材料具有最佳的吸附性能，其中99.2％的亚甲基蓝（MB），86.9％的MV，68.7％的盐酸四环素（CTC）和46.2％的四环素（TC）使用0.5 g L-1的吸附剂将其从100 mg L-1的水溶液中快速去除。去除率随吸附剂剂量的增加而增加，彻底去除MB，MV，CTC和TC分子的最小吸附剂用量为1.0 g L-1、1.2 g L-1、3.5 g L-1和4.5 g L-1。此外，纳米复合材料可以在6.5分钟内以0.0120 s（-1）的催化速率常数快速催化4-硝基苯酚（4-NP）转化为4-氨基苯酚（4-AP），并且仍然保持催化活性。重复使用8个周期后。此外，纳米复合材料在吸附有机物后可以通过相同的水热过程再生为新的吸附剂，这为有效利用载有废染料的PAL开辟了一条可持续的新途径，并开发了新的吸附和催化材料。

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