Dynamic adsorption of monoclonal antibody layers on hydrophilic silica surface: A combined study by spectroscopic ellipsometry and AFM
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The adsorption capacity of modified activated carbon(MAC) with KMnO4 to Zn2+ and Cd2+ was studied.The effect of pH,adsorption time and adsorbent dosage on adsorption rate of Zn2+ and Cd2+ was investigated,respectively.The adsorption isotherms were also studied.The results show that there is a high adsorption rate of Zn2+ and Cd2+on the MAC.The adsorption capacity of the MAC to Zn2+ is higher than Cd2+ with the increase of pH.The adsorption speed of Cd2+ on the MAC is more quickly than Zn2+.Their equilibrium time is 60 min and 120 min,respectively.The adsorption behaviors are in accordance with Langmuir model at 25℃ and pH 7.0.On the same condition,the saturated adsorption amounts of Zn2+ and Cd2+ are 10.80 mg/g and 4.564 mg/g,and the adsorption amounts are 1.2 and 1.4 times compared with that of the unmodified activated carbon,respectively.Moreover,the adsorption amounts of Zn2+ and Cd2+ on the MAC are significantly improved with the increase of temperature.
Langmuir adsorption model
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Heavy metals are contaminations which damage to the entironment greatly. Bio-film method is an effective purify process for the removal of heavy metals from wastewater. In order to find the optimal operation condition for heavy metal ions removal by bio-film, the effects of some affecting factors included: pH value, temperature, adsorption time, quantity of bio-film, co-existed ions on the adsorption were investigated. It can be known from the results of the test that: the optimal operation condition for the adsorption of Cu2+ is: pH value is 6, temperature is about 30 ℃, adsorption time is 15 min, quantity of bio-film is 12 g, the adsorption rate can reach 65%;while, the optimal operation condition for the adsorption of Cr3+ is: pH value is 3 - 7, temperature is about 25 ℃, adsorption time is 5 min, quantity of bio-film is 10 g, the adsorption rate reachs 87%. The competitive adsorption between co-existed ions may give a great influence to Cu2+ of which the adsorption capacity is weak. There is no evidence shows that Cr3+ be affected by inhibitive action or accelerative action, thus, adsorption systems which adsorb Cu2+ only or adsorb Cr3+ only can be fitted by the classical adsorption model.
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Adsorption of CrO42-by FeOOH-modified diatomite was investigated with a batch method in the study.The results indicated that,under the condition of pH value 1.0,mass concentration of Cr(Ⅵ) in wastewater lower than 100mg/L,dosage of the adsorbent 0.5g and adsorption equilibrium time about 30 min,the removal rate of Cr(Ⅵ) can reach 85%.Adsorption dynamics of Cr(Ⅵ) adsorption on the composite adsorbent can be well described by pseudo-second order equation.Not only Freundlich adsorption equation but also Langmuir adsorption equation can describe the adsorption process well.This may be attributed to the coexistence of monolayer adsorption and multilayer adsorption in the adsorption.
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Removal of low concentration COS from N2 is studied by PEI modified SBA-15 as the adsorbent.Effect of the loading amounts,adsorption temperature and impurity gas on COS adsorption of these adsorbents is studied.The adsorbents are characterized by XRD,chemisorb analyzer and FT-IR.After PEI loading the structure of SBA-15 remained unchanged and a significant decrease in surface area is observed.FT-IR spectra show that chemical adsorption occurred.The results show that 50% PEI/SBA-15 has the most perfect adsorption performance at 28℃.The breakthrough sulfur capacity is 5.383 mg/g,and saturated sulfur capacity is 11.698 mg/g.The breakthrough sulfur capacity and saturated sulfur capacity could respectively increase to 11.724 mg/g and 32.38 mg/g when the adsorption temperature is 60℃.In addition,H2S is found by GC when the adsorption temperature is 50℃,60℃,70℃.This show that chemical adsorption occurred.The 4.9 mL/L CO2 in N2 tremendously decreases the COS adsorption capacity.The adsorbent can be regenerated by N2 at 100℃.
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Carbon fibers
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Endothermic process
Methylene blue
Methyl blue
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Using diatomite as an adsorbent,the effects of several factors,including adsorbent concentration,initial iron concentration,adsorbate-solution temperature,initial adsorbate-solution pH value and adsorption time on diatomite adsorption to the Mn2+ in the simulated waste-water were examined in the experiment by static adsorption tentative.The results indicate that the maximum diatomite adsorption capacity to Mn2+ was 4.0486 mg·g-1,so the diatomite adsorbent can be used for the removal of the Mn2+ iron.Further,under the conditions of temperature lower than 50℃ and the pH value less than 6,the performance of diatomite adsorption to Mn2+ could be improved with the increases of adsorbent dosage,initial Mn2+ concentration and adsorption time.The findings also demonstrate that,compared to the Langmuir adsorption isotherms,Freundlich adsorption isotherm can better describe the adsorption process of diatomite to Mn2+,and that adsorption kinetic of diatomite to Mn2+ accorded with second-order equation.
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In this paper, corn stalk adsorbents are prepared by pretreated corn stalks and carboxymethylation reaction. Then the adsorbents are used to remove Pb2+ in the aqueous solution, and the effect of the pH value of the solution, adsorption time, adsorbent dosage, the initial concentration of Pb2+ on the adsorption performance, and the adsorption kinetics and adsorption isotherm are discussed. The results show that when the pH is 4.50, the adsorption time is 150 min, the amount of adsorbent is 0.45 g, the adsorption capacity of the adsorbent is as high as 928 mg/g, and the Pb2+ removal rate reaches 99.78 %. The adsorption kinetics showed that the adsorption of Pb2+ by the adsorbent reached adsorption equilibrium within 150 minutes, the adsorption process conformed to the quasi-second-order kinetic model, and the adsorption mechanism was chemical adsorption. The adsorption isotherm shows that the adsorption process of Pb2+ by the adsorbent conforms to the single-layer adsorption of the Langmuir model.
Langmuir adsorption model
Stalk
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The adsorption properties of six kinds of dyes compounds on the sediments in Qinghe were studied through batch technique. The influences of pH, ion strength and temperature on adsorption as well as the adsorption isotherms were discussed and determined. It was shown that pH value and ion strength were the main effect factors on the adsorption, and the adsorption percentage increased with the temperature increase. The adsorption of these dye compounds on the sediment exhibited Freundlich adsorption behavior. The dynamic adsorption indicated that the adsorption process was divided into two steps: fast adsorption (less than 1 hours) and slow adsorption (more than 12 hours).
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