In this paper the time dependence of adsorption at solid-Iiquid interface is discussed for both the mass-transport and intrinsic kinetic control of the adsorption process. It has been shown that the time dependence of adsorption of the mass-transport control' of the adsorption process is mostly dependent on the strength of adsorption (natur al diffusion) and sametimes on the mass-transport coef...

Aqueous-phase edsorption equilibrium and kinetic mechanism of phenol, 3-chlorophenol rnd o-cresol onto Norit Granular Activaied Caibon (NAC 1240) were studied in a batch system at temperature of 30 oC, agitation speed of 120 rpm, initial phenol concentrations of 25-200 mg/t. The elfects of initid phenol concentration and time of adsorption on phenol adsorption process were lnvestigated. The ads...

Applications of second-order kinetic models to adsorption systems were reviewed. An overview of second-order kinetic expressions is described in this paper based on the solid adsorption capacity. An early empirical second-order equation was applied in the adsorption of gases onto a solid. A similar second-order equation was applied to describe ion exchange reactions. In recent years, a pseudo-s...

adsorption of cations al, zn, fe, cr and pb from aqueous solution of hydrogen peroxide using ir-120 cation-exchange resin was studied. the removal percentage of the cations was examined by varying experimental conditions (such as ph of the hydrogen peroxide solution, temperature, contact time and dosage of adsorbent) in a stirred-batch system. under the optimal conditions (ph=1, t=25oc, contact...

Nickel is one of the toxin heavy metals in surface waters. Developing new approaches aimed at removing heavy metals from aqueous solutions that are simultaneously economical and environmentally friendly is of great importance. The purpose of this study will be using Nano-lignocellulose adsorbent as a natural material to remove nickel heavy metal. In this study, several important environmental p...

Toxicity has occurred in workers exposed to nickel dust or nickel carbonyl formed in refining. Increased risk of nasal and lung cancers was linked to occupational nickel exposure before current workplace safety standards were set. Activated carbon with nano holes used for removing contaminants in environment. The purpose of this work is preparation a new nano-absorber, GZ-BAKI-TAC-Ni-88, for th...

background and objectives: activated carbon is an adsorbent which is mostly employed in order to remove dye from aqueous solutions; however, commercial activated carbon is expensive and this is considered as an obstacle for its usage. therefore, the present study aimed to use waste paper as an inexpensive precursor to produce activated carbon. materials and methods: in the present study, koh wa...

Introduction: Di (2-ethylhexyl) phthalate is one of the most abundant phthalate esters and it is widely used as softeners in plastic products. Malformation, carcinogenicity, the poisoning of the reproductive system, and also the disruption of the human endocrine system are the harmful effects of these substances. Materials and Methods: In this research, the removal of di (2-ethylhexyl) phthal...

In this study, carbon was made from walnut wood as a low-cost and non-toxicnatural adsorbent.Walnut wood(WC), were successfully synthesized by an in chemical vapor deposition methodthen characterized using FT-IR techniques and used for the removal of trihalomethanes(THMs) from aqueous solution. The trihalomethanes(THMs) removal by the developed adsorbent was investigated using batch adsorption ...

Background and aims: From the past studies, it has been proved that consumption of heavy metals by humans may cause several chronicle problems like cancer, kidney and liver damage, high blood pressure and low blood pressure problems and etc. So, it has become very crucial to remove these heavy metals from industrial wastewater. The aim of this study was to find out a low cost a...