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ABSTRACT Polyacrylamide- b-poly(methacrylic acid) was prepared on the surface of Au electrode (Au/PAM/PMAA) for Pb2+ ion electrochemical sensing via metal-free visible-light-induced atom transfer radical polymerization, which was very simple, convenient, and environmentally friendly. Au/PAM/PMAA was carefully examined by cyclic voltammetry, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy. Further, Au/PAM/PMAA was successfully used for the determination of Pb2+ ion by differential pulse anodic stripping voltammetry. Under the optimal conditions, a linear response from 1.0 × 10−11 to 1.0 × 10−4 mol/L with detection limit of 2.5 × 10−12 mol/L ( S/ N = 3) was achieved from the results of experiments. Comparing with similar Pb2+ sensors, the broader linear range and lower detection limit suggested the promising prospect of Au/PAM/PMAA. In a word, the work of this article had an important significance for the polymer-modified electrodes and the sensitive detection of Pb2+. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45863. [ABSTRACT FROM AUTHOR]

Atmospheric environmental deterioration has become a significant obstacle to sustainable development, with coal-fired power plants being one of the primary pollution sources. In this paper, to achieve cleaner production, an equilibrium strategy based coal blending method under an uncertain environment is proposed to develop an environmentally-friendly based optimization method that fully considers the relationship between the local authority and the coal-fired power plant. An interactive solution approach that integrates fuzzy expected value and a possibility measure is designed to search for the solutions. The successful use of this model on a real world case demonstrates its practicality and efficiency. Sensitivity analyses under different constraint violation risk levels are also given, which can give the authority insights as to the tradeoffs required between the different decision makers as well as identify the equilibrium between environmental protection and economic development. Compared with previous studies, the proposed method has the ability to combined reduction of multiple air pollutants which include the PM 10 and carbon emissions as well as describe the trade-off between different stakeholders. The results demonstrated that as the proposed method can encourage coal-fired power plants to improve emissions performance, it could be of significant assistance to authorities when making decisions. [ABSTRACT FROM AUTHOR]

A green Knoevenagel-intramolecular cyclization cascade reaction of Meldrum′s acid with ortho-hydroxybenzaldehydes affords 3-coumarincarboxylic acids in good to high yields. [ABSTRACT FROM AUTHOR]

The employment of readily available photocatalysts and green oxygen atom sources is recognized as a promising strategy to develop sustainable catalysis for oxidation reactions. We herein reported a sacrificial reagent-free system consisting of riboflavin tetraacetate (RFT), an ester of natural vitamin B2 as the photocatalyst, and Sc(OTf) 3 and NaCl as the cocatalysts for alkyne oxidation under blue light or even sunlight irradiation to produce 1,2-diketone in which the oxygen atoms were from both water and molecular oxygen, respectively. A major Cl - /Cl• cycle was proposed to be involved and achieved by the excited [RFT-2Sc 3+ ]* complex via single electron transfer for the first time, distinguished from the OCl - active species by a two-electron process in previous flavin-halide photo-oxidation systems.