Improved adsorption performance of ZIF-8 towards methylene blue dye by hybridization with nanodiamond

Magnetic Nitrogen-Rich UiO-66 Metal–Organic Framework: An Efficient Adsorbent for Water Treatment

“…In theory, when electrostatic interactions between the adsorbate and adsorbent are repulsive, an increase in salt concentration or ionic strength increases the adsorption capacity of the adsorbents. If electrostatic interaction is attractive, an increment in salt concentration reduces the adsorption capacity of the adsorbents . Therefore, the effect of ionic strength on the adsorption capacity of m-UiO-66-TCT toward MO adsorption was investigated at various ionic strengths adjusted by NaCl, KCl, and MgCl 2 .…”

“…If electrostatic interaction is attractive, an increment in salt concentration reduces the adsorption capacity of the adsorbents. 21 Therefore, the effect of ionic strength on the adsorption capacity of m-UiO-66-TCT toward MO adsorption was investigated at various ionic strengths adjusted by NaCl, KCl, and MgCl 2 . As shown in Figure 7a, increasing the salt concentration has decreased the adsorption capacity of m-UiO-66-TCT.…”

“…To date, different MOFs, such as UiO-family, MIL-family, ZIF-family, etc., have been widely applied as adsorbents to remove organic dyes from wastewater because of their water stability, good adsorption performance, ease of synthesis, and simple modification. ,− Among them, UiO-66, which is one of the most important subclasses of MOFs, has been extensively explored in dye removal from wastewater due to its large surface area (>1000 m 2 /g), high crystallinity, high porous and crystalline stability under high mechanical pressures and temperatures, as well as harsh chemical (basic/acidic) conditions . The UiO-66 and its derivatives are mainly used as pure powders, needing high-speed centrifugation or time-consuming and tedious filtration separation after organic dye adsorption, limiting their dye removal applications. , Incorporating UiO-66 nanoparticles within or onto an appropriate substrate efficiently addresses the separation challenges. , A large body of the literature shows that the stability of MOFs could be remarkably improved against aqueous solutions by combining them with other substrates .…”

Green Synthesis of Cerium-Based Metal–Organic Framework (Ce-UiO-66 MOF) for Wastewater Treatment

“…The dye uptake at various time intervals [ Q t (mg/g)] was calculated by eq , in which C e was replaced by C t (concentration at time t ). Moreover, adsorption kinetics were calculated using three kinetic models such as pseudo-first-order (eq ), pseudo-second-order (eq ), and intraparticle diffusion (eq ), in which K 1 (min –1 ), K 2 (g/mg min), and K id (mg/g min 1/2 ) are the rate constants of these models, respectively, and constant C is related to the boundary layer thickness. , …”

“…Metal–organic frameworks (MOFs), also famous as porous coordination networks (PCNs) or porous coordination polymers (PCPs), have appeared as a new kind of crystalline and porous material due to their tunable composition, high porosity, and long-range ordered framework, along with nearly infinite structural diversity. − These outstanding properties make MOFs attractive candidates for various applications, including drug storage and delivery, catalysis/photocatalysis, wastewater treatment, gas adsorption, storage and separation, etc. − Accordingly, in the past two decades, the number of developed MOFs and their relevant applications in these fields has grown quickly. , …”