نتایج جستجو برای: initial concentrations of ions in aqueous solution
تعداد نتایج: 24464686 فیلتر نتایج به سال:
Background and Aim: Nowadays, regarding the increased human and geological activities, concentrations of toxic and carcinogenic disinfectant by-products– like Trihalomethanes -which have an organic base, in drinking water sources, has worryingly increased. Thus, the present study aimed at surveying the amount of dissolved organic carbon (doc) removed from aqueous solution by Fenton process. Mat...
the present article reports on the application of modified organo nanoclay as a green, easily prepared and stable solid sorbent for the preconcentration of trace cobalt ion in aqueous solution. the organo nanoclay was modified by adsorption of 5-(4-dimethyl amino-benzylidene) rhodanin reagent onto it. the sorption of co2+ ions was quantitative in the ph range of 7.0 to 8.5, whereas quantitative...
the space now known as complete erdos space ec was introduced by paul erdos in 1940 as the closed subspace of the hilbert space ?2 consisting of all vectors such that every coordinate is in the convergent sequence {0} ? { 1 n : n ? n}. in a solution to a problem posed by lex g. oversteegen we present simple and useful topological characterizations of ec. as an application we determine the ...
The kinetics of chromium ions sorption from aqueous solution on fungi biomass have been investigated in a batch system. The experimental data were analysed based on an intraparticle diffusion equation and a pseudo-second-order mechanism, in order to predict the constant rate of sorption and the equilibrium capacity with the effect of initial chromium ions concentration, temperature and initial ...
there are many approaches for solving variety combinatorial optimization problems (np-compelete) that devided to exact solutions and approximate solutions. exact methods can only be used for very small size instances due to their expontional search space. for real-world problems, we have to employ approximate methods such as evolutionary algorithms (eas) that find a near-optimal solution in a r...
this paper concerns the removal of zn 2+ and cr 6+ ions from waste water using a naturally occurring zeolite from semnan region in iran. a continuous fixed-column study was carried out by using zeolite as a low-cost adsorbent for the removal of zn 2+ and cr 6+ ions from aqueous solution under the effect of various process parameters such as, grain size and time. the efficiency of removal is hig...
Introduction: Biosorption of heavy metals can be an effective process for the removal of heavy metal ions from aqueous solutions. Also, living lichens are known to accumulate metals across their surface. Materials and methods: In this study, the biosorption of cadmium ions Cd (II) by the lichens Acarospora strigata, Lecanora muralis and Caloplaca aurantia was investigated in aqueous solution i...
a batch adsorption study was applied to investigate the adsorption of pb2+ ions from aqueous solutionby nanographene (ng).the adsorption percentage of pb2+ions onto ng samples at different initial ph,contact time (tc), adsorbent dosage (mng) and temperature (t) were investigated. the results showedthat ng is an excellent adsorbent for pb2+ions removal from aqueous solutions with an adsorptionpe...
introduction: biosorption of heavy metals can be an effective process for the removal of heavy metal ions from aqueous solutions. also, living lichens are known to accumulate metals across their surface. materials and methods: in this study, the biosorption of cadmium ions cd (ii) by the lichens acarospora strigata, lecanora muralis and caloplaca aurantia was investigated in aqueous solution in...
Background and Objective: Natural organic matters (NOMs) are a mixture of chemically complex polyelectrolytes with varying molecular weights, produced mainly from the decomposition of plants and animal residues. Various purification methods are used for removal of NOMs from water. The objective of this study was to remove NOMs from aqueous solution using reformed continuous carbon nanotubes col...
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