Removal of non-biodegradable heavy metals has been the top priority in wastewater treatment and the development of green technologies remains asignificant challenge.W e demonstrate that phosphorylated nanoscale zero-valenti ron (nZVI) is promising for removal of heavy metals (Ni II ,C u II , Cr VI ,H g II )v ia ab oosted Kirkendall effect. Phosphorylation confines tensile hoop stress on the nZVI particles and "breaks" the structurally dense spherical nZVI to produce numerous radial nanocracks.E xemplified by Ni II removal, the radial nanocracks favor the facile inward diffusion of Ni II and the rapid outwardtransport of electrons and ferrous ions through the oxide shell for surface (Ni II /electron) and boundary (Ni II / Fe 0 )g alvanic exchange.A ccompanied by ap ronounced hollowing phenomenon, phosphorylated nZVI can instantly reduce and immobilizeN i II throughout the oxide shell with ah igh capacity (258 mg Ni g À1 Fe). Forr eal electroplating factory wastewater treatment, this novel nZVI performs simultaneous Ni II and Cu II removal, producing effluent of stable quality that meets local discharge regulations.

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Over the past several years, perovskite‐based luminescent materials and devices have attracted considerable research interest and achieved superior performance, including red/near‐infrared, green, and blue regions. Despite the abundant research progress in the above‐mentioned luminous regions, studies on cyan‐emitting perovskites are still lacking. However, cyan‐emitting perovskite materials are of great importance and have many promising applications, especially for high‐quality lighting and light communication. Herein, the recent research progress on perovskite with cyan emission is summarized, including the preparation methods and improvement on device performance. The preparation strategies are categorized into compositional engineering, dimensional engineering, and size engineering. The corresponding device performance is displayed too. Furthermore, the strategies of performance enhancement and future perspectives are proposed in the end. There is hope that this minireview can trigger more attention to this particular emitting region.

Lead halide perovskites have promising values in photoelectronic and photovoltaic applications, but the toxicity of lead is a hard barrier. Copper halide perovskite derivatives (CHPDs), as a lead-free substitution of lead halide perovskites, also exhibit excellent photoelectric properties. Here, we present a facile one-step route for the synthesis of blue-emissive Cs3Cu2I5 (emission at 440 nm) and yellow-emissive CsCu2I3 (emission at 552 nm) CHPDs in ethanol at room temperature. Triggered by ethanol or CsI, a reversible chemical transformation accompanied by emissive color change between Cs3Cu2I5 and CsCu2I3 CHPDs was achieved. The reversible transformation mechanism was discussed, and this transformation was employed for effective anticounterfeiting.

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