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Preparation of the Adsorbent by Wheat Straw and the Study of Its Adsorption Properties on Cu2+ in Aqueous Solution

Author: PuLiJun
Tutor: ZhangJiYi
School: Lanzhou University of Technology
Course: Environmental Engineering
Keywords: Wheat straw Biological carbon adsorbent Copper Static adsorption Dynamic adsorption Dynamics
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 255
Quote: 1
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Abstract


At home and abroad on the basis of a large number of relevant literature, the paper used in wheat straw straw as raw material, its physical modification, undisturbed adsorbents were prepared and biological carbon adsorbent, and through the adsorption of copper ions in aqueous solution Performance study investigated two adsorbent performance. Static and dynamic through laboratory experiments, testing a variety of exogenous factors on Cu 2 adsorption effect and studied the two adsorbent adsorption equilibrium and the metal adsorption kinetics, while sorbent regeneration techniques are studied, as straw and other biomass used in large-scale wastewater treatment to provide a scientific basis. The main contents and results are as follows: wheat straw with original copper ions in aqueous solution by adsorption studies. Equilibrium adsorption was studied using straw dosage, pH and reaction time on wheat straw adsorb Cu 2 of. The results show that, pH significantly affect wheat straw on Cu 2 adsorption; fit well with their kinetic behavior Lagergren pseudo-second kinetic model, the Langmuir adsorption isotherm model, straw at 30 ℃ for Cu 2 of saturated adsorption capacity qm was 24.6mg · g -1 ; separation factor RL value 0 1 , between the favorable adsorption ; with 0.2mol · L -1 of HCl saturated adsorption desorption straw works well, desorption rate gt; 90%, and the regenerated adsorption effect with fresh straw straw almost. Wheat straw with original copper ions in solution for dynamic adsorption. Through dynamic adsorption test, dynamic test and desorption regeneration assay method of wheat straw on the dynamics of the copper ion adsorption and desorption. The results show that the solution flow rate, Cu 2 of the initial concentration, pH and other factors have a great impact on the dynamic adsorption. Increasing the flow rate through the volume decreases, the penetration ahead of time, reducing the amount of adsorption of straw, straw for Cu 2 removal rate decreased; at the same flow rate, increasing the Cu 2 initial concentration, adsorption capacity increases straw, straw for Cu 2 removal decreased; increasing solution pH, adsorption capacity of straw and Cu 2 < / sup> The removal rate increases. Ideal conditions: flow rate of 4.395ml · min -1 , Cu 2 initial concentration of 43.2mg · L -1 , pH 5.0, straws on Cu 2 dynamic adsorption capacity of 1.54mg · g -1 . With 0.5mol · L -1 HCl solution can effectively elute adsorbed on the surface of wheat straw Cu 2 . Wheat straw biomass materials, through the low-temperature carbonization melting temperature range limiting oxygen biological carbonaceous adsorbents were prepared, and copper ions, for example, research adsorbent adsorption of heavy metals in waste water. The results showed that: in the temperature range of the adsorbent prepared in high yield, low energy consumption, the adsorption rate, a short time to reach equilibrium, the slowest (P200) to reach adsorption equilibrium 3h, the fastest (P500) only 0.5h to reach equilibrium. P500 at 30 ℃ adsorbent for copper ion adsorption capacity of 11.19mg · g -1 . Adsorption kinetics conform Lagergren pseudo-second kinetic model, the Langmuir adsorption isotherm equation, the separation factor R L values ??between 0 and 1, are favorable adsorption. SEM analysis showed that, with the carbonization temperature, deformation of microporous straw intensified, increasing the surface roughness.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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