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Adsorbent minimisation in a two-stage batch adsorber for cadmium removal
Haya Alyasi,Hamish R. Mackey,Kavithaa Loganathan,Gordon McKay 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Cadmium is a toxic metal prevalent in a variety of industrial effluents that is toxic to both humans andanimals. This study utilizes nanochitosan, a polymer derived from crustacean shells, as an adsorbent forcadmium removal. The uptake capacity has been determined at 2.01 mmol/g and modelled by Langmuir,Freundlich and Sips isotherms, with the Sips isotherm the most suitable model for the adsorbent. In orderto minimise the amount of adsorbent used in a batch treatment process for the cadmium removal, a two-stage batch treatment has been proposed and optimised. A detailed evaluation is made of theconsequences of utilizing a less suitable isotherm, and on the benefits of utilizing a two-stage system overa single stage. Both errors from incorrect isotherms and advantages of a two-stage system are mostsignificant at low influent concentrations and high target removal efficiencies, relevant to environmentalregulatory discharge limits.
Mohammad Hadi Dehghani,Masoome Mostofi,Mahmood Alimohammadi,Gordon McKay,Kaan Yetilmezsoy,Ahmad B. Albadarin,Behzad Heibati,Mohammad Al Ghouti,N.M. Mubarak,J.N. Sahu 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
The adsorption capabilities of two nano-sized adsorbents: multi-walled carbon nanotubes (MWCNTs)and single-walled carbon nanotubes (SWCNTs) were investigated for the removal of toxic phenol. Themaximum adsorption capacities of MWCNTs and SWCNTs were determined as 64.60 and 50.51 mg/g,respectively. Adsorption kinetics followed the pseudo-second order model for both adsorbents. Theoptimum conditions using SWCNTs and MWCNTs were pH 6.57 and 4.65, phenol concentration 50 and50 mg/L, dose 1.97 and 2 g/L and contact time 36 and 56 min, respectively. The results indicated thatMWCNTs and SWCNTs were proven as high-performance adsorbents for toxic phenol removal fromwastewater.