Surfactant-free synthesis of a Fe3O4@ZIF-8 core–shell heterostructure for adsorption of methylene blue

A facile approach to the fabrication of rattle-type magnetic carbon nanospheres for removal of methylene blue in water

“…The strong absorption bands at 450 and 570 cm À1 can be assigned to the vibrations of the Fe-O functional group, which correspond to those reported for the stretching vibrations of Fe-O in bulk Fe 3 O 4 [42,43]. The absorption bands at 1625 and 1408 cm À1 are associated with carboxylate, and they indicate the presence of carboxylate groups, which are derived from trisodium citrate dehydrate [44]. The sharp absorption bands at around 1010 cm À1 indicate the presence of -OH on the magnetite nanoparticle surface [37].…”

Interconnected porous hollow CuS microspheres derived from metal-organic frameworks for efficient adsorption and electrochemical biosensing

“…Moreover, the values of the Freundlich exponent n are greater than 1, indicating that the adsorption of MB on the CuS HCMs is a favorable process. The maximum adsorption capacity of the CuS HCMs is estimated to be 19.23 mg•g -1 from the Langmuir model, which is comparable to that of twinned-hemisphere-like CuO [58], Fe 3 O 4 @ZIF-8 [59], spongelike porous MnFe 2 O 4 [60] and flowerlike Fe 3 O 4 /K x MnO 2 [61] and even much higher than that of CuS nanoparticles [62], Fe 3 O 4 hollow microspheres [63] and Co 0.85 Se nanostructures [64] (Table 3). Glucose determination has received considerable attention due to its practical applications in biotechnology, clinical diagnostics, food industry, especially in the diagnosis and management of diabetes.…”

MIL-68 (In) nano-rods for the removal of Congo red dye from aqueous solution

“…Nanoscale MOFs with various morphologies and large surface area may show better properties than bulk ones by reducing the diffusion path length [20][21][22]. Qiu et al described supramolecular template-directed synthesis of hierarchically mesostructured MIL-101 MOFs and their accelerated adsorption kinetics for methylene blue removal from water [20].…”