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Cadmium sulfide thin films have been deposited by successive ionic layer adsorption and reaction method from ethanol-aqueous solutions. The films were deposited on glass substrates. The cadmium sulfide films have been characterized by transmission spectra. Thicknesses of layers were found by AFM microscopy of partially etched film.
This study provides a theoretical basis for use of Auricularia polytricha hyphae as an adsorbent for removal of heavy metal cadmium from aqueous solution. Adsorption effect was studied from suitable pH, application dosage, biosorption time and the initial concentration of cadmium. Little biosorption of metalions was observed for pH < 3.0. The cadmium removal capacity increased very sharply with...
In continuation to our recent study on the synthesis and characterization of ZnO-NiO nanocomposites ((ZNO), in the present study the nanocomposites has been evaluated for the removal of Pb(II) and Cd(II) from the aqueous solution. The conditions for the sorption have been optimized and kinetic and thermodynamic studies were performed to understand the adsorption behavior of the nanocomposites. Though...
Adsorption/desorption of contaminants on sediment is an important process that affect the distribution and fate of contaminants between water and sediment particles. The sediment of tidal river was disturbed by tide periodically and some of the sediment was suspended in water, which has great influence in the migration of contaminants in water body. In this study, the adsorption of lead by sediment...
This paper investigated the adsorption capacities of crushed oyster shells adsorbent for cadmium and cobalt removal from heavy metal aqueous solution using batch experiments and column experiments. The results showed that: A 24 hour period was considered to provide an adequate contact time between the single-constituent metal ion solutions and the adsorbent to reach equilibrium. The equilibrium adsorption...
The adsorption of lead by soils is strongly influenced by temperature and various soil characteristics. Soil pH is one of the most important parameters influencing lead-solution and soil-surface chemistry since it affects lead speciation and the charge of soil surface groups. In general, lead adsorption is small at low pH values, and it increases with the increase in soil pH. Some investigations supported...
This paper investigated the adsorption capacities of crushed oyster shells adsorbent for several heavy metal ions removal from synthetic landfill leachate using batch experiments. Adsorbent characterization, single-constituents metal ion adsorption kinetics, single metal adsorption equilibrium isotherm models were assessed. The results showed that: a 24 hour period was considered to provide an adequate...
Wastewater containing Cadmium ion could be effectively removed by hydroxyapatite (HAP). Experimental results indicated that Cd removal percentage increased by increasing HAP dosage, solution pH, and reaction time. Cd removal percentage could approach 100%. There existed two stages from kinetic point of view. At the earlier stage, reaction rate was so fast that its kinetic process was intricate. At...
This study was aimed to model and optimize the adsorption process of cadmium from aqueous solution onto raw rice husk (RRH). The batch experiment was carried out in four factors as a function of pH (A: 5 - 9), adsorbent dosage (B: 2 - 8 g/100 ml), contact time (C: 60 - 240 minutes) and initial concentration of adsorbate (D: 70 - 110 mg/L) to response (percentage of cadmium removal). Response surface...
The present paper proposes the application of sodium trititanate whisker as solid sorbent for trace cadmium pre-concentration/separation using a static system coupled with flame atomic adsorption spectrometry (FAAS). The method comprised the pre-concentration of Cd(II) ions at a buffered solution (pH 5.0) onto 0.25 g of sorbent previously activated by 3.0 mol/L of HNO3. The elution step was carried...
A new kind of Cd2+-adsorption material was prepared using maifan stone by composite modification with chemical and heat treatment methods. The modified maifan stones were characterized by SEM and EDS. Effects of the modified maifan stone content, contact time and the initial pH of the solution on the adsorption of Cd2+ were studied. The research results show as follows: 1) The composite modified maifan...
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...
In the present study we reported the feasibility of Pseudomonas fluorescens PFC02 biomass as an alternative biosorbent to remove Co(II) and Cd(II) metallic ions from environmental and industrial wastewater.The ability of PFC02 to remove the metallic ions was investigated by using batch biosorption procedure. The effects such as, pH, biosorbent dosage, sorbate concentrations and sorbate-sorbent contact...
Based on the data of single atrazine (AT) adsorption, co-sorption of AT and cadmium (Cd), and co-sorption of AT and malathion (Ma) onto surficial sediments (SSs), a BP artificial neural network (ANN) model was established, in which the inputs were selected as concentrations of AT, Cd, Ma and the output was the amount of AT adsorption onto SSs, in order to simulate the interaction of co-existed Ma...
An investigation was conducted on the characteristics and leaching behavior of heavy metals from municipal solid wastes incineration (MSWI) fly ash in Chongqing, China. Results indicated that the average particle size of the fly ash was 36.4 μm, the large particles were formed mainly by small particles' adsorption or aggregation. The total content of the main heavy metals was about 1.04% of the fly...
In this work, A weak acid cation exchange textile (CET) was prepared by 60Co γ-rays irradiation grafting with acrylic acid (AA) onto polypropylene (PP) non-woven (PP-g-AA). The feasibility of PP-g-AA as ion exchanger for enrichment and removal of four heavy metal ions (Cu(II), Zn(II), Cd(II), Pb(II)) in seawater was investigated. The exchange capacity of CET with the grafting degree of 45% is 3.7...
Over the past several decades, trace heavy metal ion pollution, such as Cd(II), Cu(II), Pd(IV), etc., have attracted much attention because of their virulent and hard degradation properties. Recently, great efforts have been devoted to establish new methods and technologies to removal toxic metals. Among them, activated carbon adsorption, especially the modified activated carbon technology has been...
The present work deals with the study of uptake behaviour of Cd(II), Pb(II), Hg(II) and Zn(II) ions by chemically synthesized poly(p-Bromoanaline) PPBrAN using batch equilibration technique with both single and binary mixtures. The PPBrAN were chemically synthesized in different HCl concentrations. The effect of the various parameters such as synthesis method, physical oxidation state of the polymer,...
Yundang Lake is an important area for living and traveling in Xiamen Island. Severe pollution and sedimentation have been found in the lake, and then the dredging is needed. In order to assess the pollution level of dredged material, sediments from 6 stations in the Yundang Lake were sampled for heavy metal contamination, speciation analysis, and adsorption-desorption experiment in April 2003. Heavy...
Adsorption of heavy metals ion by microorganisms is emergying technology to treat wastewater. In this study, the cadmium-resistant Pseudomonas aeruginosa E1 was investigated in absorption of cadmium ion from solution. The effects of polluted solution initial pH, biosorption time, and cadmium ion concentration and biosorbent amount on biosorption efficiency were investigated. The cadmium removal percent...
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