نتایج جستجو برای: modified adsorbent
تعداد نتایج: 257807 فیلتر نتایج به سال:
background and purpose: recently, release of pollutants such as heavy metal ions to the environment becomes one of the most important problems for soil and water. the present study was conducted to introduce modified rice husk (rh) as a new low-cost adsorbent. materials and methods: in this study, tartaric acid modified rh (tarh), was used as an adsorbent for removal of ni(ii) and cd(ii) from w...
Background and Objectives: Antibiotics are among the pollutants that have entered uncontrollably in the environment, and lead to serious environmental problems such as disrupting aquatic ecosystems, and causing health problems for humans and other organisms. Therefore, it is necessary to remove them from the environment. In the current study, zeolite modified by cationic surfactant of cetylpyr...
Background and Objective: Hexavalent chromium is reported to be highly toxic, mutagenic and carcinogenic; hence treatment of water and wastewater contaminated with this element by low-cost and environmentally friendly methods is of great importance. Therefore the aim of present study was to evaluate the efficiency of Fe(II) modified bentonite for hexavalent chromium removal from a simulated was...
In this research, mesoprous compound MCM-41was synthesized by using CTAB as template and TEOS as silica source. In order to increase the adsorption capacity, the surface of the synthesized adsorbent was modified by 3-aminipropyletrimethoxysilane.The structure of the adsorbent was studied by XRD, IR, BET and TG-DTG techniques. For removal of cerium ion from aqueous solutions, NH2-MCM-41 adsorbe...
background & aims of the study: p-chloronitrobenzene is a benzoic compound that widely used in many chemical industrials. p-chloronitrobenzene may be absorbed through the skin and is suspected to causing cancer. so, developing an easy method to remove of it from the environment is necessary. equilibrium isotherms and adsorption kinetics of p-chloronitrobenzene onto modified silk waste were stud...
jute modified has been used for adsorption of cr (vi), cd (ii) and pb (ii) ions over a range ofinitial metal ion concentration. adsorption process is done in batch mode. adsorption isotherms ofthe heavy metals on adsorbents prepared were determined and correlated with common isothermequations. it was found that the freundlich isotherm is better than langmuir for explaining thebehavior of adsorp...
Large scale characterization of phosphoproteins requires highly specific methods for purification of phosphopeptides because of the low abundance of phosphoproteins and substoichiometry of phosphorylation. Enrichment of phosphopeptides from complex peptide mixtures by IMAC is a popular way to perform phosphoproteome analysis. However, conventional IMAC adsorbents with iminodiacetic acid as the ...
BACKGROUND Nowadays, removal of heavy metals from the environment is an important problem due to their toxicity. OBJECTIVES In this study, a modified method was used to synthesize chitosan-coated magnetite nanoparticles (CCMN) to be used as a low cost and nontoxic adsorbent. CCMN was then employed to remove Hg(2+) from water solutions. MATERIALS AND METHODS To remove the highest percentage ...
Natural attapulgite modified using acid activation, heat treatment, and organic modification was investigated as a humic acid adsorbent and an optimal modification method was confirmed. Results suggest that acid activation should be performed first and followed by organic modification. Optimum dosage of modified attapulgite was 0.7 g/L and the humic acid removal rate reached 97%. Optimum modifi...
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