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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...
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 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...
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...
In this study, an isothermal batch experiment was conducted to assess the characteristics of adsorption of Zn and Cd in surface samples of three typical soils from Qingdao City, China. Sorption isotherms were characterized using Linear, Langmuir and Freundlich equations. The results indicated that all the sorption isotherms were well described by the Freundlich and Langmuir equations with high coefficients...
Ion-imprinting polymer particles are prepared by copolymerization of methacrylic acid as monomer, ethylene glycol dimethacrylate as crosslinking agent and 2,2'-azo-bis-isobutyronitrile as initiator in the presence of Cd (II). Batch and column procedure are used for the determination of the characteristics of the Cd (II) solid phase extraction. The results obtained show that the maximum binding capacity,...
A by-product oil shale ash from Huadian was treated with 5 mol/L nitric acid in order to enhance its adsorption capacity. The acid-treated oil shale ash was used as a low cost adsorbent to remove of cadmium from aqueous solutions. The adsorption capacity of samples to remove of cadmium was evaluated by a series of experiments, and the test results indicated that the adsorption capacity was found to...
The demand for effective and inexpensive sorbents is increasing in response to the widespread recognition of the deleterious health effects of heavy metals exposure through aqueous solutions. An adsorbent, bio-formulation (BF), was prepared by agricultural waste. The maximal biosorption removal of cadmium (II), lead(II), copper(II), zinc(II) on BF are 99.4, 99.8, 97.6, 98.3% at pH 8, 5, 5, 7, respectively...
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