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In this dissertation, the ceramic filter media is the new environment-friendly production of red mud, using chitosan as a modifier and the new ceramic filter as the carrier, which were used to modify its surface function, to improve its removal rate of copper ions. By the research of the sorption of the modified ceramic filter media on Cu2+, we have determined the impact of initial concentration,...
Porous magnetic chitosan microspheres were prepared with reversed-phase suspension methodology using epichlorohydrin as cross-linking reagent and using CaCO3 as porogen for adsorption copper (II). Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) confirmed that the microsphere was homogeneous and highly porous. Experiments were performed at different pH of solution, contact...
Through the research on the adsorption of heavy metal ions in electronic industrial wastewater and the thermodynamics by activated carbon, influences of contact time, temperature, pH value and coexistence heavy metal ions on Cu2+, Pb2+, Zn2+ and Cr6+ adsorption were investigated in terms of experiments. The results showed that the copper adsorption onto activated carbon achieved equilibrium gradually...
This paper is study on the adsorption performance of chitosan for copper ions in conditions of different amounts of chitosan, different times, different temperatures and different pH. The results show that the best adsorption conditions is chitosan concentration of 6.4 ∼ 8.0g/L; adsorption time of 10min; adsorption temperature of 38°C; pH=6. The kinetic equation of chitosan adsorption for copper ion...
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...
The modified mesoporous silica with aminopropyl group (NH2-(CH2)3-MCM-41) and chloropropyl group (SH- (CH2)3-MCM-41) and pure mesoporous silica (MCM-41) have been synthesized via the microwave-assisted hydrothermal method. The samples were characterized by X ray diffraction, FT-IR spectroscopy and Nitrogen adsorption-desorption. Then adsorption test of copper ion was investigated. Langmuir model is...
Removal of Cu2+, Cd2+, Pb2+ and Zn2+ in wastewater was investigated using steel slag as a treatment material, and then mechanism of removal was discussed according to main crystalline phases in steel slag and Zeta potential of steel slag. The results showed the steel slag was a very suitable multi-functional material for the treatment of wastewater containing Zn2+, Cu2+, Cd2+ and Pb2+. Under treatment...
To find an effective method for uranium(VI) adsorption, uranium(VI) ion-imprinted chitosan composite magnetic microsphers (U(VI)-ICCMM) were synthesized using uranium(VI) as template, chitosan as functional monomer, epichlorohydrin and glutaraldehyde as crosslinking agents. Magnetic chitosan microsphers (MCM) were synthesized without U(VI) ion-imprinted as control. Experiments were conducted in a...
In order to evaluate the effects of heavy metals discharged in the use of fossil energy sources on the environment, a novel method using a microcolumn packed with single-walled carbon nanotubes (SWNTs) as a new adsorption material was developed for the preconcentration of trace Pb in environmental water sample prior to its monitoring by inductively coupled plasma mass spectrometry (ICP-MS). The adsorption...
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...
The pretreated brown algae Laminaria japonica was used to adsorb and desorb Au2+, Ag+, Cu2+ and Ni2+ ions from electroplating wastewater in this article. The results indicated that the biosorption process of Au2+, Ag+, Cu2+ and Ni2+ ions could be divided into two steps. The first step was physical adsorption and reached equilibrium quickly, in less than 15 min. This adsorption process followed the...
The kinetics and thermodynamics characteristics of Pb(II) and Cu(II) adsorption onto fly ash of a oil shale-fired power plant was investigated by using batch adsorption method. The results showed that Langmuir and Freundlich adsorption isotherms were applicable to the adsorption process, while Freundlich equation is more applicable. The mechanistic steps of the adsorption process was studied through...
The behavior and fate of copper binding with extracellular polymeric substances (EPS) from activated sludge, under simulating bio-calcification, was studied. Results showed that the degree of EPS sequestering with calcium had a strong differential affect on copper sorption. At lower Ca2+ concentrations (≤80 mg·l-1), the Langmuir equation was able to model adsorptive processes between Cu2+ and EPS,...
Superfill (bottom-up) phenomena relevant for Damascene processing typically rely on the time-dependent interplay of various organic and inorganic additives with both the metallic copper surface and with cuprous ions as intermediates of the copper electro-reduction in the near-surface regime. In-situ STM, in-situ SXRD (Surface X-Ray Diffraction) measurements combined with DFT calculations provide new...
The removal of Cu2+ and Cd2+ of aqueous solution by residual sludge from four type sewage treatment plant was investigated. Effect of adsorption time, kinetics and thermodynamics of adsorption was researched. The study indicated that all of the sludge can absorb mono-component Cu2+ or Cd2+ but the sludge from Petrochemical Wastewater plant had deposition rather than adsorption on Cu2+ or Cd2+. The...
A new adsorbent was developed from municipal sewage sludge (SS) combined with 5-20% pyrolusite of the weight of SS carbon, and using ZnCl2 as chemical activation reagent. Characterized by N2-BET methods and SEM, the result showed that the surface area of the new adsorbent was increased to 354.198 m2/g compared with that of the unmi- xed sludge activated carbon 232.526 m2/g and total pore and micropore...
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...
Adsorption of as-produced and purified multiwalled carbon nanotubes (MWNTs) to heavy metal using Cu(II) as a model was investigated and characterized by many techniques. The results show that the oxygenous functional groups can be formed on MWNTs after MWNTs were purified. The oxygenous functional groups play an important role in Cu(II) adsorption to form chemical complex adsorption. The adsorption...
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,...
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