Zeolitic imidazolate framework 8 (ZIF‐8) reinforced macroporous resin D101 for selective solid‐phase extraction of 1‐naphthol and 2‐naphthol from phenol compounds

Abstract

Macroporous resin has been attracting intensive attention due to its critical role in separation and purification of natural products. Herein, a zeolitic imidazolate framework 8 reinforced macroporous resin D101 was prepared via a room temperature growth method and used for dispersive SPE of 1-naphthol and 2-naphthol. The parameters affecting the adsorption and desorption efficiency such as the sample pH, adsorbent amount, extraction time, desorption solvent, and desorption time were investigated. The as-prepared adsorbent showed selectivity for 1-naphthol and 2-naphthol compared to other phenols. Under the optimum dispersive SPE conditions, the detection of 1-naphthol and 2-naphthol coupled with a CZE method was conducted and the LODs for 1-naphthol and 2-naphthol were 1.37 and 1.43 ng/mL, respectively. Moreover, the results of urine sample analysis showed the spiked recoveries to be in the range of 96.2-106.9%. This study indicated that D101@ZIF-8 (where ZIF is zeolitic imidazolate framework) is a promising selective adsorbent for the analysis of 1-naphthol and 2-naphthol in urine samples.

Mechanically fabricated Metal–organic framework/resin composite nanoparticles for efficient basic catalysis

“…68%/59% for ZIF‐8/717‐resin = 1:1/1:2 according to EDS element analysis (Table S1 and Figure S2). On the contrary, a previously reported D101‐resin @ZIF‐8 was prepared using in‐situ generation of ZIF‐8 particles within the pores of the D101‐resin, resulting in a relatively low loading amount of ZIF‐8 (0.43 wt % of Zn 2+ ) . Increasing the ratio of starting 717‐resin cannot effectively enhance the percentage of 717‐resin in the composite product.…”

“…On the contrary, a previously reported D101-resin @ZIF-8 was prepared using in-situ generation of ZIF-8 particles within the pores of the D101-resin, resulting in a relatively low loading amount of ZIF-8 (0.43 wt % of Zn 2+ ). [39] Increasing the ratio of starting 717-resin cannot effectively enhance the percentage of 717-resin in the composite product. So the ZIF-8/ 717-resin = 1:1 composite sample was chosen for the further investigation.…”

“…[38] Very recently, a ZIF-8 modified macroporous D101-resin was prepared with few ZIF-8 particles in the macropores of the resin and used for selective solid-phase extraction. [39] However, to the best of our knowledge, the composition of ZIFs with crosslinking resins has not been documented so far. Notably, since anion-exchange resins have amine groups, they are typical catalysts for heterogeneous base-catalyzed model reactions including Knoevenagel condensation.…”

“…A Fe‐MOF namely MIL‐53 (Fe) was modified by ionic resins to improve its photocatalytic performance . Very recently, a ZIF‐8 modified macroporous D101‐resin was prepared with few ZIF‐8 particles in the macropores of the resin and used for selective solid‐phase extraction . However, to the best of our knowledge, the composition of ZIFs with crosslinking resins has not been documented so far.…”

Zeolitic imidazolate frameworks in analytical sample preparation

“…Using larger microbeads as a substrate for ZIF immobilization, smaller ZIF-8 crystals can be grown with no limitations to filter pore size or facing possible loss during sorbent recovery as when using them in direct mode (as described in Section 2). Commercial macroporous polymer ion-exchange beads have also been implemented as supports for ZIF immobilization [48]. The ZIF-8 crystals were in situ grown on the resin following the sequential addition of Zn(II) and 2methylimidazole.…”