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Indolocarbazoles (ICZs) and their derivates were immensely studied in the fields of organic opto-electronics, sensors and anti-cancer agents. However, the afterglow researches, the comprehensive syntheses and crystal structures of the isomeric ICZs remained shortages. Currently, the organic afterglows were mainly focused on the crystalline states, showing restrictions and inconveniences in practical applications, the organic amorphous afterglows were more favorable but were limitedly documented. Herein, the syntheses, single crystal structures, afterglow studies and data protection applications of the ICZ families with five isomers were together presented for the first time. For these ICZ crystals, the planar configurations and high void rates made them prone to stack and vulnerable to the O2 and humidity, affected by these factors, they were hard to radiate phosphorescence at room temperature, which can be more easily aroused at 77 K. By doping the ICZ into PVA, a rigid and confined environment was built by the hydrogen bond interaction between the –NH and –OH unit in the ICZ and PVA chain, greatly hindering the molecular motion, O2 and humidity quenchers. Consequently, the triplet states were efficiently stabilized, the nonradiative transitions were highly suppressed, blooming the phosphorescence of these ICZs at room temperature, the brilliant afterglow can be straight witnessed by the naked eyes. Impressively, the highest photoluminescence efficiency of 31.06% was obtained by the ICZ–o, the longest afterglow lasting time and phosphorescent lifetime of 35 s and 2.32 s were achieved by the ICZ–p2, rivaling to the reported organic amorphous afterglows. It’s believed that the synthetic, crystal structural and afterglow studies of the ICZ families should find a promising avenue for developing new organic amorphous afterglow materials and their applications.

SnS2 material is considered as a promising anode material for Na-ion batteries (NIBs) because of its unique layered structure and high theoretical capacity. However, SnS2 nanosheets are easily overlapped during synthesis and cycling process. Also, they have to experience large volume change during repeated sodiation-desodiation processes. A promising concept is the application of hierarchical hollow structures for improving electrode stability upon cycling. However, they usually rely on template methods that require complex procedures such as chemical etching or calcination to remove inner template. Here, we demonstrate a simple and innovative strategy for fabricating the SnS2 nanosheets assembled hierarchical tubular structures (SnS2 NS ⊂ HTSs) by using cobalt-nitrilotriacetic acid chelate nanowires as soluble template, which makes shell growth and core template dissolution occur simultaneously in one step reaction. Owing to the hollow interior and well separated nanosheets with maximally exposed edges, the SnS2 NS ⊂ HTSs exhibit excellent electrochemical performance. When evaluated as the anode material for NIBs, it delivers a high discharge capacity of 708 mAh g−1 at 50 mA g−1 and still remains up to 414 mAh g−1 after 50 cycles.

Bamboo charcoal-based, iron-containing adsorbent (Fe–BC) was developed by using bamboo charcoal (BC) as a supporting medium for ferric iron that was impregnated by Fe 2 (SO 4 ) 3 and H 2 SO 4 simultaneous treatment, followed by microwave heating. The low-cost composite was characterized and used as an adsorbent for Cr(VI) removal from water. The results showed that the BET specific surface area, total pore volume, and average mesoporous diameter of Fe–BC all decreased with iron impregnation. As an adsorbent, Fe–BC showed an excellent adsorption capability for Cr(VI), the adsorption process followed the Langmuir model, and the adsorption kinetic followed pseudo-second-order model. The adsorption of Cr(VI) onto Fe–BC was spontaneous and exothermic under the studied conditions. Column adsorption experiment with Fe–BC showed that Cr(VI) could be removed to below 0.05 mg/L within 360 bed volumes at empty bed contact time 2 min when the groundwater containing approximately 0.12 mg/L of Cr(VI) was treated. The spent Fe–BC adsorbent could be readily regenerated for reuse by dilute NaOH solution.