A series of CuCoMg nanosheets derived from the LDH precursor were prepared by co-precipitation (CP) strategy and evaluated for the production of ethanol and higher alcohols via CO hydrogenation. The CuCoMg catalyst with a moderate amount of magnesium demonstrated a relatively higher total alcohol selectivity of 46.9%, and the molar percentage of ethanol was 38.5% among the total alcohols. Based on XRD and HRTEM characterizations, the introduction of Mg into the CuCo catalytic system prominently improved the dispersibility of CuCo nanoparticles. More importantly, XPS and in situ CO DRIFT results confirmed the presence of activated surface hydroxyl groups derived from MgO species over the reduced CuCoMg catalyst, which involved in the formation of bicarbonate (b-HCO 3 − ) species. It was conducive to the enhancement of the amount of CH x intermediates on the CuCoMg catalyst surface, which were applied to the CO insertion to synthesize ethanol rather than coupling to produce hydrocarbons in the CO hydrogenation reaction.

The adsorption of rhodamine B (RhB) from aqueous solution on a functionalized metal–organic framework UiO-66-(COOH)2 was studied systematically in view of the adsorption isotherm, kinetics, thermodynamics, effect of pH and co-existing salts, and regeneration of the material. The adsorption behavior of RhB on UiO-66-(COOH)2 followed the Langmuir isotherm model and pseudo-second-order model. The thermodynamics study indicates that the adsorption of RhB is mainly controlled by the entropy effect rather than the enthalpy change. The strong electrostatic interaction as well as H-bond interaction contributes to the capture of RhB on the nanoscale UiO-66-(COOH)2 via the surface adsorption manner. UiO-66-(COOH)2 exhibited an ultra-high adsorption capacity of 2200 mg g–1 and excellent continuous removal ability. The high adsorption capacity, strong anti-interference ability, and easy regeneration make UiO-66-(COOH)2 as an ideal adsorbent for RhB removal from aqueous solution.

No abstract

A water‐stable zirconium‐based metal–organic framework, MOF‐808, has been applied in selective adsorption and separation of the dyes (anionic fluorescein sodium [FS] and cationic rhodamine B [RhB]). Single‐component adsorption experiments indicate the superior adsorption of FS with a maximum adsorption capacity of 480.2 mg g−1, almost four times of the capacity for RhB. Further separation study shows that separation of these dyes can be achieved at a wide pH range of 3.5–8.5 and continuous separation is feasible in a simulated chromatographic column. Besides, this material can be well regenerated through acid washing method. Pore sieving effect is considered to be the key factor for the highly efficiency separation, and the host–guest interactions including H‐bond, π–π stacking, and coordination interactions are the main driven forces for the adsorption. Thus, this work demonstrates that MOF‐808 not only is a promising material for efficient separation of FS and RhB but also provides a new perspective for developing adsorbent with the help of distinct pore and chemical properties of MOFs.

A bubble-based EMMS/PFB model validated by experiments on a laboratory scale pressurized jetting fluidized bed was revised for pressurized fluidization.