Synthesis of a highly porous three-dimensional PVA/GO/ZIF-67 cryogel for the simultaneous treatment of water contaminated with cadmium(ii) and lead(ii) heavy metal ions

Abstract

In this research, PVA/GO/ZIF-67 cryogel as a highly porous three-dimensional polymeric adsorbent was synthesized by freeze-drying method and applied for the simultaneous removal of Cd2+ and Pb2+ ions from contaminated...

Mechanically Flexible and Weavable Hybrid Aerogel Fibers with Ultrahigh Metal–Organic Framework Loadings for Versatile Applications

“…The adsorption capacity follows the order of Cu 2+ > Pb 2+ > Cr 6+ , which is related to the hydrated ionic radii of these metal ions. 58,59 These results confirm that the flexible ZIF-67@ANF aerogel textiles exhibit great potential for adsorption of hazardous pollutants similar to MOF powder materials.…”

Rapid microwave-assisted synthesis of a magnetic biochar@ZIF-67: an efficient nanocomposite-based adsorbent for the dye-contaminated water cleanup

“…In addition, the values 20.9 < Δ H ° < 418.4 kJ mol −1 have been attributed to the chemisorption process. 25 Therefore, the results revealed that the adsorption of TA and SY dyes may have occurred with the cooperation of both physical and chemical processes. The positive Δ S 0 values (243.6 J mol −1 K −1 for TA, and 322.2 J mol −1 K −1 for SY) suggest an increase in randomness at the solid–liquid interface during the adsorption process and also some changes may have occurred in the internal structure of the adsorbent through the adsorption.…”

“…24 In this regard, ZIF-67 is one of the ZIFs which consists of the Co 2+ metal ion as the metallic node and 2-methylimidazole as the organic ligand and it has been used for various applications like adsorption, separation, electrochemistry, catalysis, and so on. 23 In recent years, ZIF-67 and its composites have been broadly used as a potential adsorbent for the efficient removal of a wide range of pollutants like heavy metal ions, 25 agricultural pesticides, 26 dyes, 27 pharmaceuticals, 28 etc. from contaminated water.…”

Highly Efficient Removal of Lead/Cadmium by Phosphoric Acid-Modified Hydrochar Prepared from Fresh Banana Peels: Adsorption Mechanisms and Environmental Application

“…Nevertheless, traditional adsorbents (i.e., activated carbon and bio-adsorbents) have limited adsorption capacity, and most of them are expensive, which causes the restriction of their large-scale application . Consequently, researchers are dedicated to developing new adsorbents, such as magnetic Fe 3 O 4 /H 2 SO 4 -activated Myrtus Communis leaves carbon, zeolite-based geopolymers, and porous three-dimensional polymerics, for removing these two metal ions from wastewater efficiently and economically. − …”

“…Wastewater contaminated by heavy metals has drawn increasing concern because of their non-degradation, carcinogenicity, and toxicity . Typically, excessive cadmium (Cd 2+ ) and lead (Pb 2+ ) cause depression and cancerization of the cardiovascular system, neurological system, and reproductive system in the human or animal body. , The World Health Organization (WHO) has specified the maximum permissible limit of Cd 2+ (0.15 mg·L –1 ) and Pb 2+ (0.10 mg·L –1 ) in drinking water .…”