The vanadate adsorption on a mesoporous boehmite and its cleaner production application of chromate

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发布日期 2014-06-27
DOI 10.1039/C4GC00897A
影响因子 10.182
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摘要

A mesoporous boehmite (γ-AlOOH) synthesis and vanadate (V(V)) ion adsorption and desorption on the mesoporous γ-AlOOH were investigated. The synthesis and adsorption studies showed that the mesoporous γ-AlOOH with a BET surface of 442 m2 g−1 and a pore size of 2.75 nm possessed a maximum V(V) ion adsorption capacity of 3.28 mmol g−1. The adsorption mechanism results showed that the mesoporous γ-AlOOH liberated surface hydroxyls to form coordinatively unsaturated AlVI centres to adsorb V(V) ions which connected oxygen of the coordinatively unsaturated AlVI centres with mono-oxo, VO terminal double bonds. The desorption studies showed that the V(V) ions could be desorbed by NH3·H2O easily. In the cleaner production application of chromate, the mesoporous γ-AlOOH was synthesized in the Na2CrO4–NaAlO2–NaVO3–H2O solutions of the chromate production and then in situ adsorbed the V(V) ions. The results showed that the V(V) ions were removed effectively, so that the highly carcinogenic CaCrO4 containing Ca(VO3)2 residue which was obtained by the typical process of chromate production was eliminated. Therefore, green separation of V(V) ions to reduce waste pollution ensuring economy and feasibility could be expected.

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Green Chemistry
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Green Chemistry provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on, but not limited to, the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998). Green chemistry is the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry is at the frontiers of this continuously-evolving interdisciplinary science and publishes research that attempts to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. Submissions on all aspects of research relating to the endeavour are welcome. The journal publishes original and significant cutting-edge research that is likely to be of wide general appeal. To be published, work must present a significant advance in green chemistry. Papers must contain a comparison with existing methods and demonstrate advantages over those methods before publication can be considered. For more information please see this Editorial. Coverage includes the following, but is not limited to: Design (e.g. biomimicry, design for degradation/recycling/reduced toxicity…) Reagents & Feedstocks (e.g. renewables, CO2, solvents, auxiliary agents, waste utilization…) Synthesis (e.g. organic, inorganic, synthetic biology…) Catalysis (e.g. homogeneous, heterogeneous, enzyme, whole cell…) Process (e.g. process design, intensification, separations, recycling, efficiency…) Energy (e.g. renewable energy, fuels, photovoltaics, fuel cells, energy storage, energy carriers…) Applications (e.g. electronics, dyes, consumer products, coatings, pharmaceuticals, preservatives, building materials, chemicals for industry/agriculture/mining…) Impact (e.g. safety, metrics, LCA, sustainability, (eco)toxicology…) Green chemistry is, by definition, a continuously-evolving frontier. Therefore, the inclusion of a particular material or technology does not, of itself, guarantee that a paper is suitable for the journal. To be suitable, the novel advance should have the potential for reduced environmental impact relative to the state of the art. Green Chemistry does not normally deal with research associated with 'end-of-pipe' or remediation issues.

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