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In general, the presence of certain inorganic anions in excess in water is a serious risk to millions of
people, as well as, aquatic life. Inorganic anions, like sulphate, chromate and perrhenate (chemical
surrogate of pertechnetate) and cyanide play significant negative roles towards nuclear waste
treatment, environment and various water related issues. Moreover, extraction of bromide, iodide
and alkali metal halides, has enormous potential in separation technology, production of common
living materials etc. Importantly, selective extraction of charge-dense anions like sulphate, chromate
and phosphates has been rare by the incapability of anion extraction to overcome the Hofmeister
bias. In this talk, emphasis will be given on our works which deal with the applications of anion
recognition chemistry in extraction, such as, (i) liquid-liquid extraction of sulfate, chromate,
[1] (ii)
extraction of alkali metal salts,
[2] (iii) selective removal of bromide,
[3] (iv) extraction of perrhenate,
[4]
(v) removal of iodide,
[5] and (vi) trapping of cyanide in steel plant wastewater[6-7]
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