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.
The present work is aimed at exploring carbon which was prepared by calcination of Cereal By-Product (CBP) and used as adsorbent for the removal of Chromium (VI) from a surface treating industry. The effect of various parameters such as adsorbent dosage, particle size, pH, contact time and stirring speed was studied. As the adsorption process is pH dependent, it showed maximum removal efficiency of...
The treatment of chromium containing wastewater using flyash and modified flyash as adsorbents was studied. The effects of time, pH, the dosage of absorbents, initial concentration on the removal of Cr (VI) in wastewater were discussed. The results showed that the modified flyash has a better efficiency on the removal of Cr (VI). The removal rate of Cr (VI) is 97.52% under the conditions of the pH=1...
The process conditions of adsorbing Cr(VI) from solution when chitosan and complex agent serves as adsorbent were discussed. The results showed that when the initial concentration of Cr(VI) was 10 mg/L, at room temperature, pH value was about 4, rotation speed was 200 rpm, the dosage of chitosan was 0.003 g/ml for 2 h, the percent removal efficiency of Cr(VI) could reach 49.2%. Additionally, the complex...
The treatment of chromium containing wastewater using chitosan and the modified chitosan as adsorbents was studied. Various factors including solution pH, the dosage of absorbents and initial Cr (VI) concentrations were taken into account and promising results obtained. The results showed that the modified chitosan have a better efficiency on the removal of Cr (VI).an initial solution PH of 1.0 was...
The kinetic, equiLibrium and thermodynamics of Cr(VI) adsorption from aqueous solution on cetylpyridinium bromide (CPB) modified zeoLite were investigated. CPB modified zeoLite displayed a good affinity to Cr(VI) in aqueous solution, and its Cr(VI) adsorption capacity decreased with the increase of the temperature. The kinetics of adsorption of Cr(VI) were discussed using the pseudo-first-order and...
Activated Carbon is a water treatment adsorbent with a large adsorption capacity, its adsorption capacity will be able to greatly enhance after modified activated. Through the use of before and after the modification of mesoporous activated carbon powder to the heavy metals copper ion adsorption, the effects of different pH, adsorption temperature, balance time, the amount of activated carbon adsorption...
A novel spherical lignin-base adsorbent (L-BAA) was prepared by reversed phase suspension polymerization technique. The L-BAA was characterized by element analysis and FTIR spectra. The modified lignin beads (L-BAA) were used to adsorb Cr (VI) from aqueous solution. The effects of the contact time, the pH value, the initial concentration and the temperature on the adsorption were investigated. It...
In this work the Fe-Mn bimetal oxide was synthesized and was used for the removal of chromium. It was found that the effective pH for adsorption of chromium was in the range of 5.0 to 7.0, and the removal percentage of chromium reached maximum at pH 6.0. The kinetic study showed that the adsorption of chromium was well described by pseudo-second-order model. The removal efficiency of chromium increased...
The purpose of this study is to evaluate the adsorption potentialities of humate substances in natural environments. Humic acid and insolubilized humic acid are selected as prototypes. This paper presents the development of a new remediation technology for contaminated sandy soil using humic acid (HA). The results indicated a significant increase of the adsorption of Cr (VI) because the complexion...
This paper reports the high biosorptive properties of an indigenous plant for Cr(VI) biosorption. The biomass uptake capacity is found 85 mg Cr(VI)/gm of biomass in batch mode. The influence of different experimental parameters such as pH, dose of adsorbent and Cr(VI) levels (15-200 mg/l), effect of contact time etc. on biosorption was evaluated. The adsorption data fitted well to Langmuir and Freundlich...
In this paper, using the plasma emission spectrometry to measure the content of Cr(VI) in aqueous, researched the impact of particle size of the tailings, the tailings dosage, pH, adsorption time, adsorption temperature on the adsorption of Cr (VI) with tailings, and with the Langmuir, Freundlich isotherm model fitted to determine the absorption law via indoor simulation experiments. Experimental...
Cr(VI) has posed great threat on environmental safety and human health, thus the remediation of Cr(VI) pollution is of considerable importance. The adsorption of Cr(VI) from aquatic solution using activated carbon was studied in this paper. The Cr(VI) sorption was relative to pH, contact time, initial content of solution, adsorbent dose and temperature. The maximum removal efficiencies of Cr(VI) were...
This study investigated the effects of dissolved organic matter (DOM) extracted form maize straw on the mobility of Cr6+ in sandy soil and losses widespread in northwest region through simulated dynamic soil column system. The results indicated that the mobility of Cr6+ was influenced significantly by DOM in saturated water-soil system. Cr6+ had strong mobility because of weak adsorption and easily...
The present study was conducted to investigate the heavy metals (HMS) removal from aqueous solutions in Complex ecosystem filter (CEF) with vermiculite substrate. Experimental results showed that the CEF was highly effectively in removal of HMS and the average removal rates of Cu2+, Zn2+, Pb2+ and Cd2+ were 81.60%, 80.55%, 83.20% and 62.21% respectively, under the hydraulic loading of 2.0m3/m2.d....
It was studied that the optimum adsorption conditions of Cr(VI) in wastewater by high efficient na-bentonite. The optimum adsorption conditions for Cr(VI) in wastewater were that the pH value was 3~5, the dosing quantity of high efficient na-bentonite was 40 g/L and the mixing time was 30 minutes. The removal rate of Cr (VI) was up to 95% under aforesaid conditions.
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...
Glycin functionalization of spherical cellulose was prepared and its application in the removal of chromium ions was investigated. The structural properties of the resulting composite material were characterized by Fourier transform infrared spectrum (FT-IR) and scanning electron microscope (SEM). The ability of the composite material for removing Cr3+ from aqueous solution was studied by batch experiments...
In resent years, various types of iron-based materials have been used as sorbents to remove heavy metals from wastewater. It is reported that the adsorption capacities of heavy metals on different kinds of iron oxides are quite high. However, researchers have not done much work on the Cr (VI) adsorption onto β-FeOOH. This study aims to investigate the removal of Cr (VI) with β-FeOOH, including the...
The thermodynamics characteristics of Cr (VI) adsorption, the effects of pH, concentration and contact time and the adsorption isotherm line at different temperature from aqueous solution with solphonated lignite under static conditions were studied. The results showed that the Langmuir isotherm equation well described experiment data in dilute solution because fitting correlation coefficients were...
By using a hydrothermal treatment process, coal fly ash was transferred to a series of synthesized zeolites and characterized XRD and SEM observations. The synthesized zeolites exhibited more enhanced adsorption capacities for metals compared to the raw material as the increased CEC of the synthesized zeolites apparently provides a better adsorptive ability for metals. For the three synthesized zeolite...
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.