Synergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a Zr-metal-organic framework

Abstract Rapid removal of radioactive strontium from nuclear wastewater is of great significance for environment safety and human health. This work reported the effective adsorption of strontium ion in a stable dual-group metal-organic framework, Zr6(OH)14(BDC-(COOH)2)4(SO4)0.75 (Zr-BDC-COOH-SO4), which contains strontium-chelating groups (-COOH and SO4) and strongly ionizable group (-COOH). Zr-BDC-COOH-SO4 exhibits very rapid adsorption kinetics (<5 min) and a maximum adsorption capacity of 67.5 mg g−1. The adsorption behaviors can be well evaluated by pseudo-second-order model and Langmuir isotherm model. Further investigations indicate that the adsorption of Sr2+ in Zr-BDC-COOH-SO4 would not be interfered by solution pH and adsorption temperature obviously. Feasible regeneration of the adsorbent was also demonstrated through a simple elution method. Mechanism investigation suggests that free -COOH contributes to the rapid adsorption based on electrostatic interaction while introduction of -SO4 can enhance the adsorption capacity largely. Thus, these results suggest that Zr-BDC-COOH-SO4 might be a potential candidate for Sr2+ removal and introducing dual groups is an effective strategy for designing high-efficiency adsorbents.

Download Full-text

Study of the adsorption of an organic pollutant onto a microporous metal organic framework

Water Science & Technology ◽

10.2166/wst.2020.566 ◽

2020 ◽

Author(s):

Mansouri Taki Eddine Mohammed ◽

Nibou Djamel ◽

Trari Mohamed ◽

Samira Amokrane

Keyword(s):

Methyl Orange ◽

Adsorption Capacity ◽

Active Sites ◽

Physical Adsorption ◽

Metal Organic Framework ◽

Specific Interaction ◽

Maximum Adsorption Capacity ◽

Film Diffusion ◽

Metal Organic ◽

Organic Framework

Abstract In this study, the microporous Metal Organic Framework-5 (MOF-5) has been synthesized to be used to remove methyl orange by adsorption. The adsorption experiments exhibit a good adsorption capacity at a catalyst dose of 0.1 g L−1 and for an initial concentration of 200 mg L−1, whereas the performance is stable over a wide pH range. The equilibrium adsorption data showed a sigmoidal course, which is well fitted by the Dubinin-Astakhov model applicable for physical adsorption processes (E = 0.055 kJ mol−1) onto heterogeneous surfaces and a more homogeneous pore structure (n = 9.9), with a maximum adsorption capacity of 1248.35 mg g−1. As can be observed from the evaluation of the kinetic data, the surface of the adsorbent is heterogeneous with different active sites for Methyl Orange (MO) adsorption. Moreover, based on the rate constant, it can be suggested that there is a specific interaction like electrostatic interaction between MO and the adsorbent for rapid and high uptake of the dye, whereas the adsorption phenomenon is reversible. According to the adsorption mechanisms, intra-particle and film diffusion models simultaneously controlled the rate sorption, which was confirmed by the calculated intra-particle diffusion and the film diffusion coefficients. The evaluation of the thermodynamic parameters revealed that the MO adsorption is spontaneous, endothermic and the randomness increases with the adsorption of MO.

Download Full-text

Synthesis and Study of an Efficient Metal-Organic Framework Adsorbent (MIL-96(Al)) for Fluoride Removal from Water

Journal of Nanomaterials ◽

10.1155/2019/3128179 ◽

2019 ◽

Vol 2019 ◽

pp. 1-13 ◽

Cited By ~ 2

Author(s):

Xingang Wang ◽

Hui Zhu ◽

Tongshuai Sun ◽

Yinbo Liu ◽

Ting Han ◽

...

Keyword(s):

Drinking Water ◽

Adsorption Capacity ◽

High Efficiency ◽

Hydrothermal Reaction ◽

Metal Organic Framework ◽

Fluoride Removal ◽

Activated Alumina ◽

Good Thermal Stability ◽

Metal Organic ◽

Organic Framework

Long-term consumption of drinking water that contains excessive amounts of fluoride can endanger human health; therefore, the preparation and application of a high-efficiency defluorination adsorbent for advanced purification of drinking water are of significant interest. This study presents a metal-organic framework adsorbent (MIL-96(Al)) with the granular structure of rice, which was generated by hydrothermal reaction. The specific surface area of MIL-96(Al) was ~220 m2 g-1, and it showed a good thermal stability. Several experiments were conducted wherein conditions, including adsorbent dosage, initial concentration, pH, and coexisting anions, were varied to understand the defluorination performance of the material. Results showed that pH (6–9) and coexisting anions had little effect on the removal efficiency of fluoride. The adsorption isotherm can be described by the Langmuir model, and the theoretical fluoride adsorption capacity of MIL-96(Al) was up to 42.19 mg Fg-1 at 298 K, which is much higher than that of the commonly used activated alumina. The adsorption process of fluoride is endothermic and follows pseudo second-order kinetics. In addition, MIL-96(Al) was shown to still achieve ~61.8% of the adsorption capacity after seven regenerations. This study shows that MIL-96(Al) is a good application prospect and could be widely used to remove fluoride from water.

Download Full-text

Bimetallic Metal‐Organic Framework with High Adsorption Capacity toward Lithium Polysulfides for Lithium‐sulfur Batteries

Energy & Environmental Materials ◽

10.1002/eem2.12196 ◽

2021 ◽

Author(s):

Pengbiao Geng ◽

Meng Du ◽

Xiaotian Guo ◽

Huan Pang ◽

Ziqi Tian ◽

...

Keyword(s):

Adsorption Capacity ◽

Metal Organic Framework ◽

High Adsorption ◽

Lithium Sulfur Batteries ◽

Metal Organic ◽

High Adsorption Capacity ◽

Lithium Sulfur ◽

Organic Framework

Download Full-text

Shaggy-like Ru-clusters decorated core-shell metal-organic framework-derived CoOx@NPC as high-efficiency catalyst for NaBH4 hydrolysis

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2020.12.011 ◽

2021 ◽

Vol 46 (11) ◽

pp. 7772-7781 ◽

Cited By ~ 1

Author(s):

Shasha Dou ◽

Wanyu Zhang ◽

Yuting Yang ◽

Shuqing Zhou ◽

Xianfa Rao ◽

...

Keyword(s):

High Efficiency ◽

Metal Organic Framework ◽

Core Shell ◽

Metal Organic ◽

Organic Framework

Download Full-text

Rare-Earth Metal–Organic Framework@Graphene Oxide Composites As High-Efficiency Microwave Absorbents

Crystal Growth & Design ◽

10.1021/acs.cgd.0c01555 ◽

2021 ◽

Author(s):

Yu Zhou ◽

Liwei Zhu ◽

Yanjian Wang ◽

Liangmin Yu ◽

Xia Li

Keyword(s):

Graphene Oxide ◽

Rare Earth ◽

Rare Earth Metal ◽

High Efficiency ◽

Metal Organic Framework ◽

Earth Metal ◽

Metal Organic ◽

Oxide Composites ◽

Organic Framework

Download Full-text

Metal–Organic Framework-Based Solid Acid Materials for Biomass Upgrade

Transactions of Tianjin University ◽

10.1007/s12209-021-00298-4 ◽

2021 ◽

Author(s):

Yutian Qin ◽

Jun Guo ◽

Meiting Zhao

Keyword(s):

High Efficiency ◽

Solid Acid ◽

Metal Organic Framework ◽

Acid Sites ◽

Solid Acid Catalysts ◽

Future Research ◽

Acid Catalysts ◽

Metal Organic ◽

Biomass Transformation ◽

Organic Framework

AbstractBiomass is a green and producible source of energy and chemicals. Hence, developing high-efficiency catalysts for biomass utilization and transformation is urgently demanded. Metal–organic framework (MOF)-based solid acid materials have been considered as promising catalysts in biomass transformation. In this review, we first introduce the genre of Lewis acid and Brønsted acid sites commonly generated in MOFs or MOF-based composites. Then, the methods for the generation and adjustment of corresponding acid sites are overviewed. Next, the catalytic applications of MOF-based solid acid materials in various biomass transformation reactions are summarized and discussed. Furthermore, based on our personal insights, the challenges and outlook on the future development of MOF-based solid acid catalysts are provided. We hope that this review will provide an instructive roadmap for future research on MOFs and MOF-based composites for biomass transformation.

Download Full-text