Tetrabutylammonium cyanoborohydride. New, exceptionally selective reducing reagent

Removal of lead and chromium from wastewater using bagasse fly ash—a sugar industry waste

“…About 95-96% lead and chromium are removed at lower flow rates (1.0 ml min −1 ), while this decreases with increased flow rate. The results obtained from the column experiments were applied to the wellknown bed-depth-service-time (BDST) model proposed by Hutchins [28] and it was found that the results obtained in column experiments for lead and chromium obey this model very well, which indicates the feasibility of these column experiments. The breakthrough curves (Fig.…”

Analysis and modeling of fixed bed column operations on As(V) removal by adsorption onto iron oxide-coated cement (IOCC)

“…Hutchins [55] presented a modification of the BohartAdams equation, which requires only three column tests to collect the necessary data. In this technique, called the bed depth service time (BDST) approach, the Bohart-Adams equation is expressed as…”

Removal of lead (II) ions from synthetic and real effluents using immobilized Pinus sylvestris sawdust: Adsorption on a fixed-bed column

“…In this relation e (k ads N 0 /u)z 1, thus ln(e (k ads N 0 /u)z − 1) ∼ = k ads N 0 u Z, that is the reason why Hutchins [11] proposed the following linear relation between the column bed depth (Z) and the service time (t b ):…”

“…(3) allows to calculate the value of N 0 and thus to estimate the value of Z 0 . If there is a change in the initial solute concentration C 0 to a new value C 0 , the new values of m 0 and C x can be, respectively, obtained from the slope and the intercept according to the relations proposed by Hutchins [11]:…”

“…When the linear flow rate is changed from u to u , the new value of the slope (m x ) is obtained by Eq. (8) [11]. However the intercept remains unchanged because it depends on the inlet solute concentration C 0 :…”