Chemical Engineering

Download Basic Principles and Calculations in Chemical by David M. Himmelblau PDF

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By David M. Himmelblau

Biochemical engineering; Chemical & Biochemical; Chemical engineering

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The results show that the GAC prepared from bamboo waste can be a suitable adsorbent in dye removal using fixed bed adsorption columns. 2,4-dichlorophenoxy-acetic acid (2,4-D) is a herbicide which is widely used to control the growth of broad-leaved weeds. Its low cost and good selectivity makes it preferable between various herbicides. It is toxic and poorly degradable [105] and can cause wide environmental pollution. Aksu and Kabasakal [105] have reported the batch adsorption of 2,4-D from aqueous solution by GAC.

The mean free energy of sorption per molecule of sorbate when it is transferred from infinity to solid surface in the solution, E (kJ mol-1), can be calculated using D and Eq. 18. 18) BET isotherm is expressed as Eq. 19 and can be linearized as Eq. 20 [76]. 20) In these equations qe and qm are the equilibrium amount and the amount of adsorbate adsorbed on adsorbent as complete monolayer (mg g-1), respectively. Kb is a constant related to the energy of interaction with surface. Ce is the equilibrium concentration of the adsorbate in the solution (mg L-1), and Cs is the saturation concentration of adsorbate in solution (mg L-1) which is dependent on temperature [77].

This study shows that PAC can remove more than 99% of the three estrogenic compounds. So, it can be resulted that PAC can be used in removal of endocrine disrupting compounds from contaminated water. PAC has widely used in removal of various gaseous pollutants that are going to be discharged into the atmosphere through flue gases. g. g. dioxins, furans, polychlorobenzenes (PCBs)) and polycyclic aromatic hydrocarbons (PAHs). Bais et al. [90] have used PAC for the removal of persistent organic pollutants including fluoranthene (belongs to PAHs family) and hexachlorobenzene (belongs to PCBs family) from gas stream.

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