Biofabrication of iron oxide nanoparticles using manglicolous fungus Aspergillus niger BSC-1 and removal of Cr(VI) from aqueous solution
Biofabrication of iron oxide nanoparticles using manglicolous fungus Aspergillus niger BSC-1 and removal of Cr(VI) from aqueous solution
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DOI：
10.1016/j.cej.2019.123790
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发表时间：
2020-04-01
影响因子：
15.1
通讯作者：
Das, Surajit
中科院分区：
文献类型：
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作者：
Chatterjee, Shreosi;Mahanty, Shouvik;Das, Surajit
利用红树林（红树林）真菌黑曲霉（Aspergillusniger）BSC-1成功制备了粒径为20-40 nm的超顺磁性氧化铁纳米粒子（IONP）（Fe 3 O 4），并将其用于去除水中的六价铬。利用紫外-可见光谱、衰减全反射-傅里叶变换红外光谱、拉曼光谱、X射线衍射、电子显微镜（TEM和FESEM）、zeta粒度仪和VSM对真菌合成的离子纳米粒子进行了表征。分批实验揭示了显著（P < 0.05;双因素方差分析和Tukey多重比较检验）高Cr（VI）去除是在40 ℃和pH 3下，使用2.5g/L的IONP剂量。然而，随着吸附剂量的增加，观察到每g IONP的Cr吸附的显著（P < 0.05;双因素ANOVA和Tukey多重比较检验）损失，表明铁和Cr分子之间的非等效性。吸附等温线和动力学模型分别采用Langmuir和准二级反应表明铬在离子纳米粒子表面的单层吸附。共存的阳离子和阴离子的存在下，没有表现出任何竞争性的影响，对Cr（VI）的去除揭示真菌合成的IONP对Cr（VI）的选择性。再生研究证实，IONP保存其Cr（VI）的去除效率与最小的损失（19.3%）后，五个吸附/解吸循环。此外，X射线光电子能谱表明，吸附和氧化还原反应参与Cr（VI）解毒。因此，真菌合成的离子纳米颗粒可用于污染废水中重金属的修复。
Superparamagnetic iron oxide nanoparticles (IONPs) (Fe3O4) of 20-40 nm size were successfully fabricated by using manglicolous (mangrove) fungus Aspergillus niger BSC-1 and utilized for the removal of hexavalent chromium from aqueous solution. The mycosynthesized IONPs were characterized using by UV-Vis spectroscopy, ATR-FTIR spectroscopy, Raman spectroscopy, XRD, electron microscopy (TEM and FESEM), zeta sizer and VSM. Batch experiment revealed the significantly (P < 0.05; two-way ANOVA and Tukey's multiple comparisons test) high Cr(VI) removal was at 40 degrees C and pH 3 with 2.5 g/L of IONPs dose. However, a significant (P < 0.05; two-way ANOVA and Tukey's multiple comparisons test) loss of Cr adsorption per g of IONPs was observed with an increase in adsorption dose indicating non-equivalence between iron and Cr molecule. The adsorption isotherm and kinetic model using Langmuir and pseudo-second order reaction respectively suggested monolayer adsorption of Cr onto IONPs surface. Presence of coexisting cations and anions did not exhibit any competitive effect on Cr(VI) removal revealing selectivity of mycosynthesized IONPs towards Cr(VI). Regeneration study confirmed that IONPs conserved their Cr(VI) removal efficiency with minimal loss (19.3%) after five adsorption/desorption cycles. Further, X-ray photoelectron spectroscopy indicated that both adsorption and redox reaction were involved in Cr(VI) detoxification. Therefore, the mycosynthesized IONPs could be utilized for heavy metal remediation from contaminated wastewater.