·Three sets of column experiments were conducted to investigate the effects of physicochemical factors on the cotransport and retention of HANPs and hematite in saturated sand columns Table 1 The first set investigated the role of pH and at IS = mM KNO 3 and Darcy velocity q = cm min − 1
Semantic Scholar extracted view of "Dicarboxylic acid transport through hematite coated sand " by Y Hwang et al
·Most interestingly despite relatively low values of relative density the hematite sand yielded higher shear wave velocity than that of uncoated sand Figure 5; compare the relative density % and % sands both with kN/m 3 silica unit weight from Table 3 Additionally the relative density % hematite sand also delivered higher
·A bulk of silica sand was taken from Kowli Kosh silica sand mine to reduce its hematite content by reverse flotation The raw sample consisted of % SiO 2 and % Fe 2 O 3 and traces of Al 2 O 3 CaO MgO Na 2 O K 2 O TiO 2 Fig 1 illustrates a general block diagram for the hematite removal process from silica sand The sample was first fine crushed
·To assess the adsorption characteristics of the two media experiments with mM phthalic acid at pH were conducted with clean sand C1 and hematite coated sand C4 For the clean sand phthalic acid breakthrough nearly matched that for bromide Fig 1 a and the near 100 percent recovery of the acid in the effluent Table 1 confirmed little affinity existed
The adsorption/desorption properties of hematite sand HS for removal of two toxic dyes have been tested in aqueous solution by batch process HS was prepared by a simple economic and environmentally friend method The raw sand and HS were characterized Toluidine blue TB and crystal violet CV were selected as a toxicity model Fe2O3 85% is the major constituent of
·The adsorbent used in this study is the natural material Hematite sand It is also referred to as Titaniferous sand or Black sand We will use the term Hematite titaniferous sand HTS in this research This sand was collected from Taghazout beach 23 km away from Agadir city Morocco Table 2 groups the kinetic model parameters
·Defect structures are commonly found in natural and synthesized hematite which can strongly affect the adsorption behaviors and coordination environments of HMIs on the surface of hematite As shown in Table 1 hematite with Fe vacancies or irregular shapes generally exhibits a larger adsorption capacity μmol/m 2 than that of well defined
·Khan et al 2020 investigated the replacement of sand with hematite powder in UHPC The density of all their UHPC mixtures was 2600 to 2900 kg/m 3 which was the minimum dry density considered These mixtures were as heavy as concrete both were used with the chemical characteristics shown in Table 1 Barite hematite and lead powders
·The chemical properties of gentisic acid including protonation constants are given in Table 1 Quartz sand with a nominal grain size of 10 The resulting hematite coated sand HCS was washed several times to remove salts and non attached iron oxide particles then centrifuged and dried under N 2 atmosphere A sample of nano hematite with
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