Obtaining and properties of clinoptilolite modified by manganese dioxide

Efficient technology for the removal of iron and manganese ions from artesian water using clinoptilolite

“…It was shown by special adsorption studies [7] that the specific surface area of the deposited d-MnO 2 is 425 m 2 /g, which is significantly higher than the value of 300 m 2 /g measured in [9] for pure d-MnO 2 . This fact is attributed to the For the experimental verification of the quality of the developed sorbent-catalyst, a two-stage technology was proposed.…”

“…In our publications [5,7] a technology for the deposition of MnO 2 nanoclusters onto the external surface of clinoptilolite grains was proposed; the material obtained in this way was used for the adsorption-catalytic removal of Fe(II) and Mn(II) ions from artesian water. The method used for the formation of surface nanoclusters of MnO 2 was based on the introduction of Mn 2+ cations which act as the precursors, into the exchange positions at A method and technology for the deposition of strongly bonded high-disperse manganese dioxide onto the external surface of clinoptilolite grains is developed.…”

Purification of undergound waters of manganese compounds using a natural sorbent-catalyst

“…Papers [9,10,21] give the investigation results of purifying the water of wells of manganese by sorbentscatalysts based on clinoptilolyte (ICCCW, NAS of Ukraine), Klinopur Mn (Slovakia), Birm (the US), Greensand (the US). It has been shown that the recovery of the operating capacity of the filtering media requires regeneration by the solution of potassium permanganate.…”

“…Among them one may single out dolomite, clinoptilolyte, etc. The Institute of Colloid Chemistry and Chemistry of Water, National Academy of Sciences of Ukraine (ICCCW) has developed the method of water purification of manganese ions using modified clinoptilolytes [9,10], which is a natural feedstock implying its low costs. However, its effective use calls for periodic regeneration with a solution of potassium permanganate, To eliminate this shortcoming papers [13,14] proposed the method of obtaining a sorbent-catalyst, which, according to preliminary data for restoration of its capacity in terms of manganese compounds does not need Minding the above the present paper has carried out pilot technological tests of using the sorbent-catalyst for purifying natural water of the operating well of manganese compounds.…”

“…One of the most promising methods of purifying the water of manganese compounds at present is consid ered the method combining chemical and physical components of water treatment processes, namely, filtra tion through grain media having catalytic properties [6][7][8][9][10]. Chemical essence of the process lies in that ions of bivalence manganese, which are contained in the initial water are oxidized by dissolved oxygen of the air in the presence of a catalysts, are transferred into insoluble manganese compounds, and are removed by a layer of the medium.…”