A facile method to achieve dopamine polymerization in MOFs pore structure for efficient and selective removal of trace lead (II) ions from drinking water

Functionalized Activated Carbon Fibers by Hydrogen Peroxide and Polydopamine for Efficient Trace Lead Removal from Drinking Water

“…To investigate the adsorption capacity meeting drinking water standard of PDA/H-ACF, repeated adsorption experiments were performed, and the results are shown in Figure b. It can be seen that the effluent lead concentration still met the WHO standard after being repeated 14 times, the removal rate was still above 93.5%, and the adsorption capacity meeting the standard reached 20.34 mg/g after the 14 experiments, which was far higher than those of previous reported adsorption materials , and above the single maximum adsorption capacity of 4.46 mg/g, indicating that the PDA/H-ACF was especially suitable for the removal of trace lead. The adsorption performance was also compared with other adsorbents, and the results are shown in Table S8, indicating the as-prepared material had superior adsorption performance.…”

“…From Figure a it can be seen that the N 2 uptake of ACF, H-ACF, and PDA/H-ACF increased rapidly with the increase of pressure at low relative pressure (0 < P/P 0 < 0.2), which could be attributed to the large adsorption potential of the micropores. For PDA/H-ACF, the N 2 uptake gradually increased as the relative pressure increased at middle relative pressure, ascribing to the presence of some stacked mesopores caused by the polymerization of dopamine Figure b shows the pore size distribution of the samples before and after modification by hydrogen peroxide and polydopamine, and the corresponding specific surface areas (SSA), average pore size, and pore volume are shown in Table S2.…”

“…For PDA/H-ACF, the N 2 uptake gradually increased as the relative pressure increased at middle relative pressure, ascribing to the presence of some stacked mesopores caused by the polymerization of dopamine. 40 Figure 2b shows the pore size distribution of the samples before and after modification by hydrogen peroxide and polydopamine, and the corresponding specific surface areas (SSA), average pore size, and pore volume are shown in Table S2. Compared with pristine ACFs, the number of micropores in the sample pretreated with hydrogen peroxide significantly reduced, the proportion of mesopores increased, and the specific surface area of the sample also obviously reduced (from 927 m 2 /g to 488 m 2 /g).…”

Surprisingly fast assembly of the MOF film for synergetic antibacterial phototherapeutics

“…The rapid increment of C and N might belong to the extra benzene rings and -NH 2 groups in DA. 47 The abundant hydroxyl groups on the FP surface were packaged by the ZIF-8/DA cross-linked network, which led to a significant decrease in the O element. As the crucial factors in this ZIF-8/DA chelation mechanism, chemical bond changes among Zn, O, and C elements were further investigated.…”

Calcium-Modified Fe3O4 Nanoparticles Encapsulated in Humic Acid for the Efficient Removal of Heavy Metals from Wastewater

“…In particular, adsorption has gained high popularity due to low cost and favorable performance . Many kinds of adsorbents have gained application in heavy-metal removal, including graphene oxide (GO), metal–organic framework (MOF), activated carbon (AC), biochar, or natural macromolecular compound. − Being used as the low-cost sorbent material of low-rank coal origin, humic acid (HA) contains numerous acidic groups like carboxyl (−COOH), phenolic hydroxyl (−OH), and other O-containing functional groups that provide more adsorption sites and enhance the adsorption capacity …”