The CREATE-ECLA Randomized Controlled TrialThe CREATE-ECLA Trial Group Investigators* See also pp 427 and 489.

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N-Doped carbon dots (CDs) were directly synthesized with a high yield of 21.85% by one-pot pyrolysis of a gel composed of ethanolamine and 1-carboxyethyl-3-methylimidazolium chloride at 220 °C for 2 h. The as-synthesized CDs with a mean particle size of 7.8 nm were uniform, amorphous, and abundant in nitrogen content (23.15 wt%) and surface groups such as amide and hydroxyl. Thus, the CDs exhibited good water-solubility, bright blue excitation- and pH-dependent fluorescence with a quantum yield of 17.93%, and high ionic strength tolerance. In addition, a CD-based fluorescent sensor towards Cr(vi) ions with favorable sensitivity and selectivity was constructed based on the inner filter effect. Two good linear relationships between the concentration of Cr(vi) ions and the PL quenching efficiency were obtained in the ranges from 0.2 to 2 (R2 = 0.9965) and 2-40 μM (R2 = 0.9918), and the limits of detection (LOD = 3σ/S) were calculated as 0.018 and 0.25 μM, respectively. Importantly, this sensor was solid and capable of rapidly detecting Cr(vi) ions in tap water with detection ranges of 0.2-2 (R2 = 0.9817) and 2-60 μM (R2 = 0.9902), LODs of 0.048 and 0.40 μM, and recoveries of 102.1-106%.

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In this study, a mesoporous α-Fe 2 O 3 /SiO 2 composite with highly ordered mesostructure and large surface area and pore volume was feasibly fabricated via a spontaneous infiltration route by employing the template-containing mesoporous SiO 2 as support. Fe species are highly dispersed in the framework of the SiO 2 with relatively low Fe content. At high Fe content (rFe:Si = 0.12), α-Fe 2 O 3 nanocrystals with an average size of about 50 nm were incorporated in the matrix of the SiO 2 , existing as both framework and extra-framework forms. The synthesized α-Fe 2 O 3 / SiO 2 composite shows a high adsorption capacity (90 mg•g −1 ) and the superior heterogeneous Fenton-like catalytic activity for the removal of 300 mg•L −1 methylene blue from aqueous solutions (removal efficiency = 100%). The α-Fe 2 O 3 /SiO 2 composite also has a remarkable adsorption and catalysis performance in a wide pH range of 3.0−11.0 and exhibits an excellent stability and reusability.

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