College of Environmental and Resource Science, Zhejiang University, Hangzhou, 310058, China; Linde + Robinson Laboratories, California Institute of Technology, Pasadena, CA, 91125, United States.
Linde + Robinson Laboratories, California Institute of Technology, Pasadena, CA, 91125, United States.
Chemosphere. 2021 Oct;280:130567. doi: 10.1016/j.chemosphere.2021.130567. Epub 2021 Apr 28.
Organic dyes can enter water bodies through industrial wastes and may pose a threat to the health of aquatic organisms and human. Metal organic framework derived carbon materials (CMOFs) have shown excellent performance for aqueous dye adsorption. However, few have studied multimetallic CMOFs for dye removal. Herein, a ternary metal oxide embedded carbon derived from amino-modified metal organic framework (CMOF(Fe/Al/Ni 8/7/5)-NH) has been developed as an efficient adsorbent to remove aqueous methylene blue (MB) and acid red 73 (AR-73). CMOF(Fe/Al/Ni 8/7/5)-NH reached adsorption equilibrium for both MB and AR-73 within 30 min at neutral pH condition. It also achieved 18 and 24 times higher adsorption than commercial activated carbon (AC) in 10 min for MB and AR-73, respectively. Compared to other CMOFs-NH, CMOF(Fe/Al/Ni 8/7/5)-NH had the highest adsorption capacity for both cationic MB and anionic AR-73. In addition, CMOF(Fe/Al/Ni 8/7/5)-NH had < 0.15% metal leaching in 90 min in the pH range of 4-10, and it also maintained 89% and 95% adsorption capacity for MB and AR-73 in five consecutive adsorption batches, respectively. Electrostatic interaction was identified as the primary interaction between CMOFs-NH and the dyes, and the embedded crystalline metal oxides with different points of zero charge (PZCs) were identified to be the key adsorption sites. A uniformly distributed surface charge model was proposed to explain the exceptional adsorption capacity of CMOF(Fe/Al/Ni 8/7/5)-NH With fast kinetics, high adsorption capacity, wide applicability and good stability, CMOF(Fe/Al/Ni 8/7/5)-NH may be an effective adsorbent for many other ionic organic pollutants.
有机染料可通过工业废物进入水体，可能对水生生物和人类健康构成威胁。金属有机骨架衍生的碳材料 (CMOFs) 在水相染料吸附方面表现出优异的性能。然而，很少有研究用于去除染料的多金属 CMOFs。在此，开发了一种由氨基修饰的金属有机骨架 (CMOF(Fe/Al/Ni 8/7/5)-NH) 衍生的三元金属氧化物嵌入碳作为高效吸附剂，用于去除水中的亚甲蓝 (MB) 和酸性红 73 (AR-73)。在中性 pH 条件下，CMOF(Fe/Al/Ni 8/7/5)-NH 对 MB 和 AR-73 的吸附在 30 分钟内达到平衡。它在 10 分钟内对 MB 和 AR-73 的吸附量分别比商业活性炭 (AC) 高 18 倍和 24 倍。与其他 CMOFs-NH 相比，CMOF(Fe/Al/Ni 8/7/5)-NH 对阳离子 MB 和阴离子 AR-73 均具有最高的吸附容量。此外，CMOF(Fe/Al/Ni 8/7/5)-NH 在 pH 4-10 范围内 90 分钟内的金属浸出率<0.15%，并且在五个连续吸附批次中，对 MB 和 AR-73 的吸附容量分别保持 89%和 95%。静电相互作用被确定为 CMOFs-NH 与染料之间的主要相互作用，而具有不同零电荷点 (PZC) 的嵌入结晶金属氧化物被确定为关键吸附位点。提出了一种均匀分布的表面电荷模型来解释 CMOF(Fe/Al/Ni 8/7/5)-NH 异常高的吸附能力。具有快速动力学、高吸附容量、广泛适用性和良好稳定性的 CMOF(Fe/Al/Ni 8/7/5)-NH 可能是许多其他离子有机污染物的有效吸附剂。
