As the water-soluble derivative of graphene,graphene oxide (GO), with many functional groups on thesurface, is one of the best candidates for fabricating artificialnacre, because functional surface groups allow for chemicalcross-linking to improve the interfacial strength of theadjacent GO layers. Until now, several methods have beendeveloped to functionalize individual GO sheets and enhancethe resultant mechanical properties, including divalent ion(Mg

/pdf/ultratough-artificial-nacre-based-on-conjugated-cross-linked-4g7k87y26j.pdf

Ultratough artificial nacre based on conjugated cross-linked graphene oxide

https://www.cell.com/chem/pdf/S2451-9294(20)30631-8.pdf

A nitrogen-rich covalent organic framework for simultaneous dynamic capture of iodine and methyl iodide

The efficient and safe capture of radioactive iodine (129I or 131I) is of great significance in nuclear waste disposal. Here, we report millimeter-scale poly(ether sulfone) composite beads loaded with porous Cu-BTC [Cu3(BTC)2, BTC = 1,3,5-benzenetricarboxylate] (Cu-BTC@PES), prepared by a phase inversion method for the removal of volatile iodine. Three kinds of Cu-BTC@PES composite beads were obtained with different Cu-BTC contents of 48.6, 60.2, and 71.9%, respectively. While maintaining crystallinity, the composite beads exhibited higher I2 vapor adsorption capacity (639 mg/g) in the form of iodine molecules. The iodine absorption up to 260 mg/g and the adsorption was followed Langmuir isotherm and pseudo-second-order kinetic model. Furthermore, the composite beads can still absorb more than 85% of iodine after 3 cycles of regeneration with excellent recyclability. The resulting Cu-BTC@PES composite beads show great potential for the sustainable removal of radioactive iodine.

Controllable Synthesis of Porous Cu-BTC@polymer Composite Beads for Iodine Capture

Two novel thorium-based metal-organic frameworks (MOFs), namely Th-SINAP-7 and Th-SINAP-8, have been synthesized via the solvothermal reactions of thorium nitrate and 1,4- or 2,6-naphthalenedicarboxylic acid in the presence of acid modulators. Bearing the rigid aromatic architectures, Th-SINAP-7 and Th-SINAP-8 exhibit exceptional chemical (from pH 1 to 12) and thermal stabilities (up to 520 °C), as well as ionizing radioresistance (2 × 105 Gy β and γ irradiations). The highly porous nature and conjugated π-electrons of naphthalene on the organic linkers endow high affinity of both MOFs toward I2 molecules owning to the charge transfer between π-electrons of the host networks and the guest iodine molecules, as evidenced by combined techniques including of FTIR, PXRD, SEM-EDS, UV-vis spectroscopy, XPS, and Raman spectroscopy. Particularly, Th-SINAP-8 can efficiently remove >99% I2 from cyclohexane solution and exhibit guest uptake of iodine vapor with an adsorption capacity of 473 mg/g.

Ultrastable Thorium Metal-Organic Frameworks for Efficient Iodine Adsorption.

The ever-increasing demand for green and clean energy urge the development of cheap and efficient electrode materials for supercapacitors (SCs). In this context, several naturally abundant bio-wastes have been explored to develop porous carbons for SCs due to their easy availability, high performances, and simple processing methods. Although various BDCs are utilized for SC, the relation between the bio-waste precursor and resultant carbon materials are not very well understood. Here, we highlight how the different bio-waste precursors affect the surface characteristics of the carbon nanostructures and outlined their subsequent effect on electrochemical performances. Moreover, the surface modification of carbon materials using pre-processing, carbonization and activation methods is provided. The supercapacitive properties of activated carbons (AC) with their unique surface features derived from the different feedstock are systematically summarized. Finally, the challenges and future directions for the development of AC from bio-waste are discussed. Overall, this review provides a guide to understand how best to refine and carbonize this biomass to achieve optimum supercapacitive performance.

Advances in bio-waste derived activated carbon for supercapacitors: Trends, challenges and prospective

Efficient capture of iodine by a polysulfide-inserted inorganic NiTi-layered double hydroxides

A strategy of making waste profitable: Nitrogen doped cigarette butt derived carbon for high performance supercapacitors

Novel synthesis of NaY-NH4F-Bi2S3 composite for enhancing iodine capture

As one of the materials having a bionic structure, nacrelike layered composites, inspired by their natural hybrid structures, have been studied via a variety of approaches. Graphene oxide (GO), which differed from inert graphene, was used as a new building block because it could be readily chemically functionalized. Rather than natural polymers, synthetic polymers were most commonly used to fabricate nacrelike GO–polymer materials. However, naturally occurring polymers complied more easily with the requirements of biocompatibility, biodegradability, and nontoxicity. Here, a simple solution-casting method was used to mimic natural nacre and fabricate a self-assembled and aging-resistant binary natural polymer, (κ-carrageenan (κ-CAR)–Konjac glucomannan (KGM))–GO nanocomposites, with varying GO concentrations. The investigation results revealed that κ-CAR–KGM and GO mostly self-assemble via the formation of intermolecular hydrogen bonds to form a well-defined layered structure. The mechanical properties of t...

Jiehong Lei

Papers

Efficient capture of iodine by a polysulfide-inserted inorganic NiTi-layered double hydroxides

A strategy of making waste profitable: Nitrogen doped cigarette butt derived carbon for high performance supercapacitors

Novel synthesis of NaY-NH4F-Bi2S3 composite for enhancing iodine capture

Preparation and Perfomance of an Aging-Resistant Nanocomposite Film of Binary Natural Polymer–Graphene Oxide

Effect of phase evolution and acidity on the chemical stability of Zr1-xNdxSiO4-x/2 ceramics