The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Microbe produced rhamnolipids are often mixtures containing multicomponent homologues. To understanding the rhamnolipid sorption affected by its homologue compositions is of considerable importance to its application for environmental restorations, including rhamnolipids pump-and-treat for polluted groundwater, rhamnolipids flushing to mobilize hydrophobic contaminants, as well as effects of contaminants...
The natural zeolite was investigated as an inexpensive and effective adsorbent for the adsorption of Amido Black 10B, Acid Red and Safranine T from its queous solution respectively. The effect of parameters such as the solution of pH, contact time, the doze of the natural zeolite and the initial concentration of dye was examined. The adsorption isotherm was well fitted to both the Langmuir and Freundlich...
The effects of salinity and humic acid (HA) on di-n-butyl phthalate (DBP) adsorption by nutshell-based activated carbon were studied by batch experiments in this paper. Adsorption kinetics was evaluated. The kinetic curves were almost the same both in the presence and absence of NaCl, and second time adsorption occurred in the presence of HA. Three kinetic models, pseudo-first-order, pseudo-second-order...
A previous study using the batch method showed that sorption behavior of Perchloroethylene (PCE) in low organic content (0.080~0.090 % foc) aquifer sand was nonlinear and fitted the amended dual-mode model (DMM). This study aimed to investigate the transport of PCE in same media using finite duration and continuous input of solute in laboratory column tests. The experiments showed that the transport...
The effect of solution temperature and the determination of the kinetic parameters of methylene blue (MB) adsorption onto cereal chaff were performed to understand the adsorption mechanism. The pseudo-second order kinetic model was fitted to the experimental data and found it was good to predict the adsorption behavior using nonlinear regressive method, suggesting that the mechanism may be a chemisorption...
In the present study we reported the feasibility of extracellular biopolymer (PF-9) produced by Pseudomonas fluorescence C-9 as an alternative biosorbent to remove Pb(II) metallic ions from environmental and industrial wastewater.The ability of PF-9 to remove the metallic ions was investigated by using batch biosorption procedure. The effects such as, pH, biosorbent dosage, sorbate concentrations...
Rice husk, an agriculture byproduct, was used to adsorb congo red (CR) from aqueous solutions. Variables of the system, including contact time, pH, salt concentration, and equilibrium CR concentration, were adopted to study their effect on CR adsorption. The results showed that when the equilibrium concentration of CR increased, quantity of CR adsorption onto rice husk increased correspondingly. The...
The paper investigated the treatment effect of modified rice husk as an adsorbent on wastewater containing Zn(II). Langmuir and Freundlich equations quantified the Zn(II) removal effect of modified rice husk. We analyzed characteristics of adsorption kinetics, the initial pH value, temperature effect on adsorption process, and compared with the regeneration efficiency of adsorbent. The results showed...
The study evaluated the sorption of Zn(II) ions from aqueous solution by two low-cost materials, waste somatic and dead tea fungus. The rate and extent of accumulation were affected by pH, contact time and initial zinc ion concentration. The initial removal was rapid and equilibrium was established in less than 30 min. Good correlation coefficients were obtained when the pseudo-second-order kinetic...
This study attempted to find the adsorption law of fly ash to COD in domestic sewerage. After the elementary characterization of fly ash was described, the influence of contact time, sorbent concentration, and different pretreatment ways of fly ash, initial COD concentration and temperature on the adsorption process was investigated. Results showed adsorption equilibrium attained within 120 min time...
The phosphate removal potential of steel slag modified by high temperature activation has been investigated. The effects of adsorbent dose, pH, contact time and initial phosphate concentration on the phosphate adsorption by modified steel slag have been studied. Phosphate removal was seen to increase with increasing adsorbent dose, contact time and decreased with increasing initial phosphate, while...
The sludge carbon made from sewage sludge with ZnCl2 are used for gatifloxacin adsorption. Characterizing sludge carbon and researching mechanism of gatifloxacin adsorption on different adsorbents. The results showed: sludge carbon have large surface area and mid-hole structure. The adsorption keep to second kinetics model, that means chemical adsorption is the main progress. The research proves sludge...
A three-layer artificial neural network (ANN) model was developed to predict the contributions of non-residual and residual components in surficial sediments (SSs) on atrazine (AT) adsorption based on 32 experimental sets obtained in a laboratory batch study, in which the inputs were selected as contents of Fe oxides, Mn oxides, organic materials (OMs), residual component and the initial concentrations...
Mainly containing organic materials, the printing and dyeing wastewater is a kind of industrial pollution with complex composition and high colority, which is difficult to be treated. With the large volume of new auxiliary and slurry applied to the modern textile industry, the biodegradability rate of organic pollution decreased and it is more difficult to be treatment. Comprehensively considered...
A three-dimensional heterogeneous macrocosmic mass transfer model was proposed. The effect of some parameters such as solid adsorptive capacity and diameter distribution on gas absorption was studied in detail. From the results, the adsorption capacity of particles played an important role in gas absorption. With an increase of particle capacity, the adsorption driving force increases greatly, resulting...
Coke oven gas is one of by-products generated in the process of dry distillation of coal to form coke. The coke oven gas is of high value in used as not only energy but also chemical material, but it contains hydrogen sulfide (H2S) gas which limits its application. Thus, it is necessary to remove H2S from the coke oven gas in order to use it as energy or chemical material. The thermodynamic analysis...
The ion adsorption of cobalt (2+) on the oxide sorbents with different concentrations of the ions of Co2+ and pH has been experimentally studied. The acid-base model of adsorption, which makes it possible to optimize the technological regimes of the adsorption of Co2+ on the inorganic sorbents (Co2O3, TiO2, Fe2O3, Fe3O4, SiO2 and other) has been proposed. The special feature of model is calculation...
Humic acid (HA) was considered to be the main precursor of disinfection by-products (DBPs) in chlorination. In this study, an effective and economic method of preparing TiO2 film was successfully developed for adsorption of HA. The crystal structure and surface morphology of the TiO2 film were characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM). The effects of some factors such...
Batch equilibrium experiments were performed to assess adsorption and desorption characteristics of nitrobenzene and aniline by wetland soil. The results showed that wetland soil had strong adsorption capability for nitrobenzene and aniline, adsorption and desorption of nitrobenzene and aniline by different types of wetland soil were different. The linear and Fruendlich model were fit for describing...
In the dissertation, the treatment of chromium containing wastewater using sawdust which is a low-cost biosorbent. The influences of physical and chemical parameters such as pH value, reaction time and temperature and the initial concentration of metallic ion on the adsorption process were investigated by batch adsorption. When the pH value 6, reaction temperature 323 K, dosage of sawdust 6 g/L, the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.