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The adsorption of Cu2+ from pharmaceutical wastewater by zeolite was studied in a batch adsorption system. Factors influencing copper adsorption such as pH (1-5), adsorbent dosage (5-50 g/L) and contact time (20-600 min) were investigated. The equilibrium of adsorption process was established in about 480 min, while pH was 5 and adsorbent dosage was 30 g/L. After the adsorption equilibrium was achieved,...
In recent years, through wafer electrical connections have become important roles, which will be used in developing high-speed, compact 3D microelectronic devices in next generation. Although the electroplating copper is a well-established process, completely void-free electroplating in through silicon holes (TSH) with a high aspect ratio remains a big challenge. Naturally, local current distribution...
Self assembled monolayer (SAM) of alkane-thiol of 6-carbon (1-hexanethiol, C6) chain length is applied on Cu surface (deposited on Si substrate) and examined carefully. Firstly, the ability of SAM adsorption onto Cu surface is confirmed by the sharp rise of water contact angle (CA) on the surface. Next, the thermal stability of SAM when it is stored in different environments is studied. The CA decreases...
Adsorption-desorption behavior of copper in Sichuan mine soils was studied using the batch method. The measured copper adsorption data was described by the Langmuir equation and the Freundlich equation respectively. The results indicated that the Freundlich equation was less suitable than the Langmuir equation to describe the adsorption data. In contrast to copper adsorption, the amount as well as...
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...
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...
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...
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...
Adsorption of Heavy metals from aqueous solutions by industrial waste sludge was investigated. The effect of time and initial concentration solution pH, were studied in batch kinetic experiments. The initial uptake was rapid and equilibrium was achieved within 180 minutes. The data relating to percentage of adsorption at different pH values were fitted into the surface complex model and the overall...
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...
The copper heavy metal wastewater does lots of harm to people and it is difficult to deal. Using flocculant to treat copper wastewater has a lot of advantages. Under certain conditions proceeded modification of a kind of clay which has the unique characteristic of absorbability. Then the modification clay and the polymerization iron carbonyl ion can play polyreaction, to innovate a new type of macromolecule...
Put dead immobilized saccharomyces cerevisiae biomass into column of continuous upflowing reactor. Study the influence of temperature, quantity of saccharomyces cerevisiae in column and initial Cu2+ concentration on Cu2+ adsorption. Determine optimal operating parameters of initial pH values, flow rates and quantities of saccharomyces cerevisiae in column through orthogonal experiment. Analyse adsorption...
This paper studies how chemical modification influences the Saccharomycescerevisiae adsorption on copper ion and the desorption of nitric acid, and carries out infrared spectrum analysis of native, adsorbing and desorbing saccharomyces cerevisiae. Results show that carboxyl and amino group in Saccharomycescerevisiae play an important role in the process of adsorbing Cu(II). The adsorption on Cu(II)...
The process of biosorption of heavy metal ion Cu(II) by immobilized brown algae Laminaria japonica is discussed in this paper, with the adsorption characteristics of L. japonica investigated as a parameter of initial pH, initial concentration of Cu(II), particle size, algal dose and temperature. The maximum adsorption of Cu(II) ion on L. japonica biomass was observed at pH 3-5. The higher initial...
Batch experiments were carried out to investigate heavy metal ions adsorption properties of steel slag, the results showed that steel slag could be used as an effective adsorbent to removal heavy metals such as Cr3+,Cu2+,Pb2+and Zn2+ from the aqueous solution. For the heavy metal Cr3+, the removal yield increased with increasing contact time and reached the equilibrium state within lh; The removal...
One reliability concern, when soldering to a Cu surface finish, is the sporadic mechanical degradation of solder joints due to the formation and growth of voids within the interfacial Cu3Sn intermetallic compound (IMC) layer and at its interface with the Cu pad structure. Excess organic impurity incorporation during Cu electroplating has been shown to cause this problem. The level of impurity incorporation...
Cu2+ and Zn2+ adsorption onto the synthetic iron oxides prepared in laboratory including ferrihydrite (amorphous), goethite and hematite, and natural iron ore powder were investigated. The results showed that Cu2+ and Zn2+ adsorption onto the iron oxides: ferrihydrite, goethite, hematite and iron ore powder could be described by non-linear Langmuir, linear Freundlich, and Temkin models with significant...
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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