Preparation of Nanofibrous Metal–Organic Framework Filters for Efficient Air Pollution Control

Zhang, Yuanyuan; Yuan, Shuai; Feng, Xiao; Li, Haiwei; Zhou, Junwen; Wang, Bo

doi:10.1021/jacs.6b02553

Cited by 577 publications

(442 citation statements)

References 46 publications

(57 reference statements)

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“…The harvested water from PGF only contains about 0.15 µg mL −1 of SO x 2− , which is one hundred times lower than the value (20 µg mL −1 ) of SO x 2− in the water condensed directly. [40][41][42][43][44] We put PGF in a hazy environment overnight, and measured the leachate of PGF ( Figure S17, Supporting Information). [22,23] SEM image of PGF after releasing water clearly shows the remaining impurities on the inner surfaces of porous PGF ( Figure S16, Supporting Information), further indicating the favorable ability of PGF to grab impurities from the air for the clean water production.…”

Section: Doi: 101002/adma201905875mentioning

confidence: 99%

Highly Efficient Clean Water Production from Contaminated Air with a Wide Humidity Range

et al. 2019

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contaminated inevitably by the impurities, such as microorganisms, fine particulate matters (PM), and toxic gases like sulfur oxides (SO x ). [11,12] Recently, miscellaneous hygroscopic materials have been explored for moisture capture. For instance, metalorganic frameworks (MOFs) like MOF-801 could harvest 0.25 g g −1 water at a relative humidity (RH) of 20%, and poly(Nisopropyl acrylamide)/sodium alginate (PNIPAAm/Alg) polymer hydrogel demonstrated 0.6 g g −1 water uptake at the RH of 80%, respectively. [13][14][15][16] However, MOF-801 only worked in a narrow RH range (<20% RH) with low water uptake, and the quality of the oozed water from PNI-PAAm/Alg hydrogel was uncertain for the risk of impurities. As a result, it is still a big challenge for harvesting high-quality clean water free of impurities from the air within a full range of humidity.Herein, we demonstrate a highly efficient clean water production system from a contaminated environment with a wide range of humidity based on a rationally designed sodium polyacrylate (PAAS)/graphene framework (PGF). This porous framework with plentiful oxygen functional groups facilitates the sorption of water vapor in humid air and simultaneously grabs the impurities under van der Waals force (Figure 1). Moreover, a high solar-thermal conversion capability of PGF makes water easily desorbed under sun irradiation. [2,17,18] As a result, such a PGF presents the equilibrium water uptake of 0.14 g g −1 at a low RH of 15%, and a superhigh uptake of 5.20 g g −1 at an RH of 100%, exhibiting the excellent water uptake ability in a wide range of humidity. Under solar irradiation of 1 sun (1 kW m −2 ), the sorbed water can be quickly desorbed into vapor within a few minutes to generate clean water free of impurities. Thus, the PGF meets the requirements of efficient moisture capture, impurities filtration, and clean water production from natural air. For practical application, a lab-made prototype of moisture purification and water harvest (MPWH) system is built to collect over 25 L clean water per kilogram of PGF daily from the atmospheric environment. This PGF offers an efficient platform to capture moisture in ordinary and contaminated air for the production of high-quality clean water.The porous PGF is easily prepared through a convenient freeze-drying method (see details in Materials and Methods, Supporting Information). Typically, PAAS is well dispersed in a graphene oxide (GO) dispersion after ultrasonic treatment (Figure 2a). After the freeze-drying (Figure 2b) and reductionThe huge amount of moisture in the air is an unexplored and overlooked water resource in nature, which can be useful to solve the worldwide water shortage. However, direct water condensation from natural or even hazy air is always inefficient and inevitably contaminated by numerous impurities of dust, toxic gas, and microorganisms. In this regard, a drinkable and clean water harvester from complex contaminated air with a wide humidity range based on porous sodium polyacrylate/graphene framework (PGF...

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Section: Doi: 101002/adma201905875mentioning

confidence: 99%

Highly Efficient Clean Water Production from Contaminated Air with a Wide Humidity Range

et al. 2019

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“…MOFs have advantages such as tunable porosity, chemical stability, ultrahigh specific surface area, and ability to tune the surface chemistry. These features have enabled MOFs to find applications in diverse research fields including heterogeneous catalysis,9 gas storage,10 separation,11 capture,12 and chemical sensing 13. The electrochemical properties of MOFs have recently received significant attention in the chemical literatures 14.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Charge Collection in MOF‐525–PEDOT Nanotube Composites Enable Highly Sensitive Biosensing

et al. 2017

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With the aim of a reliable biosensing exhibiting enhanced sensitivity and selectivity, this study demonstrates a dopamine (DA) sensor composed of conductive poly(3,4‐ethylenedioxythiophene) nanotubes (PEDOT NTs) conformally coated with porphyrin‐based metal–organic framework nanocrystals (MOF‐525). The MOF‐525 serves as an electrocatalytic surface, while the PEDOT NTs act as a charge collector to rapidly transport the electron from MOF nanocrystals. Bundles of these particles form a conductive interpenetrating network film that together: (i) improves charge transport pathways between the MOF‐525 regions and (ii) increases the electrochemical active sites of the film. The electrocatalytic response is measured by cyclic voltammetry and differential pulse voltammetry techniques, where the linear concentration range of DA detection is estimated to be 2 × 10−6–270 × 10−6 m and the detection limit is estimated to be 0.04 × 10−6 m with high selectivity toward DA. Additionally, a real‐time determination of DA released from living rat pheochromocytoma cells is realized. The combination of MOF5‐25 and PEDOT NTs creates a new generation of porous electrodes for highly efficient electrochemical biosensing.

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“…One of the most environmental challenges is the removing of particulate matter (PM) which causes serious harm to public health. Metal−organic frameworks (MOFs) are crystalline materials with high porosity, tunable pore size, and rich functionalities, holding the promise for contaminant capture (Zhang et al, 2016). Here, nanocrystals of four unique MOF structures are processed into nanofibrous filters.…”

Section: Environmental Management and Sustainable Developmentmentioning

confidence: 99%

Nanotechnology: Future of Environmental Air Pollution Control

Mohamed

2017

EMSD

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Environmental contamination is one of the important issues that the world is confronting today, and it is expanding with each passing year and leading to grave and harmful effect to the earth. At present, the air contains various pollutants like CO, chlorofluorocarbons, volatile organic compounds, hydrocarbons, and nitrogen oxides. Water and soil are also contaminated with organic and inorganic compounds, the major sources for water and soil contamination are sewage water, industrial effluents, random use of pesticides, fertilizers, and oil spills. In parallel, the rapid growth of nanotechnology has gained a great deal of interest in the applications of nanomaterials potential in improved systems for monitoring and cleanup including all the three phases of environment . It can develop the pollutants sensing and detection and help in the improvement of novel remediation technologies. Nanomaterials are excellent adsorbents, catalysts and sensors due to their large specific surface areas and high reactivates. This review firstly sheds the light on the definition of nanoparticles, and the nanotechnology concept, the fundamental properties, classification, and fields of nanotechnology applications. Then it focuses broadly on the application of nanotechnology in environmental fields, in particular, its application in air pollution monitoring and remediation and its future trend in this field.

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Preparation of Nanofibrous Metal–Organic Framework Filters for Efficient Air Pollution Control

Cited by 577 publications

References 46 publications

Highly Efficient Clean Water Production from Contaminated Air with a Wide Humidity Range

Highly Efficient Clean Water Production from Contaminated Air with a Wide Humidity Range

Enhanced Charge Collection in MOF‐525–PEDOT Nanotube Composites Enable Highly Sensitive Biosensing

Nanotechnology: Future of Environmental Air Pollution Control

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