Postsynthetically Modified Covalent Organic Frameworks for Efficient and Effective Mercury Removal

Journal of the American Chemical Society, Journal Year: 2017, Volume and Issue: 139(7), P. 2786 - 2793

Published: Feb. 13, 2017

A key challenge in environmental remediation is the design of adsorbents bearing an abundance accessible chelating sites with high affinity, to achieve both rapid uptake and capacity for contaminants. Herein, we demonstrate how two-dimensional covalent organic frameworks (COFs) well-defined mesopore structures display right combination properties serve as a scaffold decorating coordination create ideal adsorbents. The proof-of-concept illustrated by modifying sulfur derivatives on newly designed vinyl-functionalized mesoporous COF (COF-V) via thiol–ene "click" reaction. Representatively, material (COF-S-SH) synthesized treating COF-V 1,2-ethanedithiol exhibits efficiency removing mercury from aqueous solutions air, affording Hg2+ Hg0 capacities 1350 863 mg g–1, respectively, surpassing all those thiol thioether functionalized materials reported thus far. More significantly, COF-S-SH demonstrates ultrahigh distribution coefficient value (Kd) 2.3 × 109 mL which allows it rapidly reduce concentration 5 ppm less than 0.1 ppb, well below acceptable limit drinking water (2 ppb). We attribute impressive performance synergistic effects arising densely populated groups strong binding ability within ordered mesopores that allow diffusion species throughout material. X-ray absorption fine structure (XAFS) spectroscopic studies revealed each Hg bound exclusively two S intramolecular cooperativity COF-S-SH, further interpreting its excellent affinity. results presented here reveal exceptional potential COFs high-performance remediation.

Language: Английский

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Emerging opportunities for nanotechnology to enhance water security

Nature Nanotechnology, Journal Year: 2018, Volume and Issue: 13(8), P. 634 - 641

Published: July 27, 2018

Language: Английский

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Spinel ferrite magnetic adsorbents: Alternative future materials for water purification?

Coordination Chemistry Reviews, Journal Year: 2016, Volume and Issue: 315, P. 90 - 111

Published: Feb. 7, 2016

Language: Английский

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Biopolymer Aerogels and Foams: Chemistry, Properties, and Applications

Angewandte Chemie International Edition, Journal Year: 2018, Volume and Issue: 57(26), P. 7580 - 7608

Published: Jan. 10, 2018

Abstract Biopolymer aerogels were among the first produced, but only in last decade has research on biopolymer and biopolymer–composite become popular, motivated by sustainability arguments, their unique tunable properties, ease of functionalization. open‐cell foams have great potential for classical aerogel applications such as thermal insulation, well emerging filtration, oil–water separation, CO 2 capture, catalysis, medicine. The field today is driven forward empirical materials discovery at laboratory scale, requires a firmer theoretical basis pilot studies to close gap market. This Review includes database with over 3800 evaluates state field, critically discusses scientific, technological, commercial barriers commercialization these exciting materials.

Language: Английский

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High-silica zeolites for adsorption of organic micro-pollutants in water treatment: A review

Water Research, Journal Year: 2018, Volume and Issue: 144, P. 145 - 161

Published: July 7, 2018

High-silica zeolites have been found to be effective adsorbents for the removal of organic micro-pollutants (OMPs) from impaired water, including various pharmaceuticals, personal care products, industrial chemicals, etc. In this review, properties and fundamentals high-silica are summarised. Recent research on mechanisms efficiencies OMP adsorption by reviewed assess potential opportunities challenges application in water treatment. It is concluded that capacities well-related surface hydrophobicity/hydrophilicity structural features, e.g. micropore volume pore size zeolites, as well OMPs. By using undesired competitive background matter (BOM) natural could potentially prevented. addition, oxidative regeneration applied on-site restore capacity OMPs prevent toxic residues re-entering environment.

Language: Английский

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Porous Polymers as Multifunctional Material Platforms toward Task‐Specific Applications

Advanced Materials, Journal Year: 2018, Volume and Issue: 31(4)

Published: Oct. 22, 2018

Exploring advanced porous materials is of critical importance in the development science and technology. Porous polymers, being famous for their all-organic components, tailored pore structures, adjustable chemical have attracted an increasing level research interest a large number applications, including gas adsorption/storage, separation, catalysis, environmental remediation, energy, optoelectronics, health. Recent years witnessed tremendous breakthroughs these fields thanks to unique structures versatile skeletons polymers. Here, recent milestones diverse applications polymers are presented, with emphasis on structural requirements or parameters that dominate properties functionalities. The Review covers following applications: i) adsorption, ii) water treatment, iii) iv) heterogeneous v) electrochemical energy storage, vi) precursors carbons, vii) other (e.g., intelligent temperature control textiles, sensing, proton conduction, biomedicine, actuators). key each application discussed in-depth understanding structure-property relationships provided. Finally, perspective future directions challenges this field presented further studies.

Language: Английский

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New frontiers for the materials genome initiative

npj Computational Materials, Journal Year: 2019, Volume and Issue: 5(1)

Published: April 5, 2019

Abstract The Materials Genome Initiative (MGI) advanced a new paradigm for materials discovery and design, namely that the pace of deployment could be accelerated through complementary efforts in theory, computation, experiment. Along with numerous successes, challenges are inviting researchers to refocus approaches were originally inspired by MGI. In May 2017, National Science Foundation sponsored workshop “Advancing Accelerating Innovation Through Synergistic Interaction among Computation, Experiment, Theory: Opening New Frontiers” review accomplishments emerged from investments science infrastructure under MGI, identify scientific opportunities this environment, examine how effectively utilize innovation infrastructure, discuss achieving research seamless integration experiment, theory. This article summarizes key findings provides perspectives aim guide direction future its translation into societal impacts.

Language: Английский

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Nonporous Adaptive Crystals of Pillararenes

Accounts of Chemical Research, Journal Year: 2018, Volume and Issue: 51(9), P. 2064 - 2072

Published: July 16, 2018

ConspectusPorous materials with high surface areas have drawn more and attention in recent years because of their wide applications physical adsorption energy-efficient adsorptive separation processes. Most the reported porous are macromolecular materials, such as zeolites, metal–organic frameworks (MOFs), or coordination polymers (PCPs), organic (POPs) covalent (COFs), which building blocks linked together by coordinative bonds. These barely soluble thus not solution-processable. Furthermore, relatively low chemical, moisture, thermal stability most MOFs COFs cannot be neglected. On other hand, molecular cages (POCs), been developed very recently, also show promising They can solvents, making them solution-processable materials. However, they usually sensitive to acid/base humid environments since based on dynamic bonding. two similar features: Brunauer–Emmett–Teller (BET) rigid pore structures, stable during processes.In this Account, we describe a novel class solid for separation, nonporous adaptive crystals (NACs), function at supramolecular level. initial crystalline state, but intrinsic extrinsic porosity along crystal structure transformation is induced preferable guest molecules. Unlike solvent-induced polymorphism phenomena common that occur solid–liquid phase, NACs capture vaporized guests solid–gas phase. Upon removal molecules, transforms back original structure. Here focus discussion pillararene-based transformations from state new guest-loaded structures Single-crystal X-ray diffraction, powder gas chromatography, solution NMR spectroscopy main techniques verify processes structural transformations. Compared traditional pillararenes several advantages. First, preparation simple cheap, synthesized large scale meet practical demands. Second, better than MOFs, COFs, POCs, constructed basis reversible chemical Third, many means easily processed solution. Fourth, regeneration reused times no decrease performance. It expected will only exert significant influence scientific research industry.

Language: Английский

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Potential Difference Driving Electron Transfer via Defective Carbon Nanotubes toward Selective Oxidation of Organic Micropollutants

Environmental Science & Technology, Journal Year: 2020, Volume and Issue: 54(13), P. 8464 - 8472

Published: June 10, 2020

Nanocarbon-based persulfate oxidation emerges as a promising technology for the elimination of organic micropollutants (OMPs). However, nature active site and its working mechanism remain elusive, impeding developments high-performance oxidative water treatment practice. Here, we report that defect-rich carbon nanotubes (CNTs) exhibit superior activity in activation peroxymonosulfate (PMS) OMP oxidation. Quantitative structure-activity relationship studies combined with theoretical calculations unveil double-vacancy defect on CNTs may be intrinsic site, which works conductive bridge to facilitate potential difference-dominated electron transfer from highest occupied molecular orbital OMPs lowest unoccupied PMS. Based this unique mechanism, established CNTs@PMS system achieves outstanding selectivity realizes target-oriented specific complicated aquatic environment. This work sheds new light carbocatalysis selective develops an innovative toward remediation practical wastewater.

Language: Английский

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Rational design, synthesis, adsorption principles and applications of metal oxide adsorbents: a review

Nanoscale, Journal Year: 2020, Volume and Issue: 12(8), P. 4790 - 4815

Published: Jan. 1, 2020

The shortage of water resources and increasingly serious pollution have driven the development high-efficiency treatment technology. Among a variety technologies, adsorption is widely used in environmental remediation. As class typical adsorbents, metal oxides been developed for long time continued to attract widespread attention, since they unique physicochemical properties, including abundant surface active sites, high chemical stability, adjustable shape size. In this review, basic principles process will be first elucidated, affecting factors, evaluation index, mechanisms, common kinetic isotherm models. Then, properties several oxides, key parameters performance such as particle/pore size, morphology, functionalization modification, supports calcination temperature discussed, well their application removal various inorganic organic contaminants. addition, desorption recycling spent adsorbent are summarized. Finally, future oxide based adsorbents also discussed.

Language: Английский

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