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Chemosynthesis of Chitosan Carrier Algicide Containing Copper and Its Application

Author: LiHongLiang
Tutor: ChenYuCheng;YangZhiMin
School: Southwestern University
Course: Environmental Engineering
Keywords: Chitosan Chitosan carrying copper algicide Chlorella pyrenoidosa
CLC: X52
Type: Master's thesis
Year: 2007
Downloads: 145
Quote: 2
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Abstract


This situation is worsening, eutrophication, CuSO the 4 as a broad-spectrum efficient algicide is widely used at home and abroad. However, the direct launch is likely to cause in water of of Cu 2 concentrations of local high harm other aquatic organisms, and deterioration of water bodies. In this context, sustained release contains copper algicide become a research hotspot. As a natural polymer chitosan (CTS), containing the active groups-NH 2 -OH, has superior adsorption characteristics, combined with its easy degradation of environment-friendly makes it carrying copper off The algicide the ideal carrier. Chitosan as a carrier, the study of the adsorption and desorption properties of chitosan Cu 2 synthesis based on chitosan carrying copper algicide Chlorella pyrenoidosa test algae species and simulated eutrophic water to explore its algicide effects. Single-factor test to explore the influencing factors of chitosan Cu 2 adsorption amount found to increase with the rise of copper sulphate initial concentration, maximum adsorption capacity of up to 1200mg / L; decreased with the increase of the amount of chitosan to obtain the maximum amount of adsorption in 0.025g; with elevated pH increase, considering the pH to about 4.5 to obtain the amount of the higher adsorption; first increased as the temperature increased then decreased, the critical point of 40 ° C; increased with the adsorption time, 30min before growth rate, then the slowdown in growth and about 90min to reach the maximum adsorption capacity. Orthogonal experiment results show that the influence of chitosan Cu 2 adsorption amount of the order of importance of each factor should be for the amount of chitosan gt; temperature gt; copper sulphate initial concentration gt; adsorption time. Adsorbing Cu 2 of the optimal combination of chitosan dosage 0.025g, a temperature of 40 ° C, the adsorption time of 60 min, copper sulphate initial concentration of 1200mg / L, under the condition Gets the amount of adsorption of 256mg / g. Carrying copper CTS release the amount of copper increased with time the initial 24h release rate soon, linear growth 24 hours after the release rate slowed down significantly and was increased stepwise release kinetics curves available the Elovich, Langmuir and two power equation of the fitting; with elevated pH decreases, the pH value of 6 to 8, the change has little effect on the release copper capacity; increased with the increase in the amount of carrier copper CTS, 50 mg / L 24h after release will be able to reach 0.687mg / L, theoretically able to guarantee effective algicide. Chlorella pyrenoidosa liquid maximum absorption wavelength of 680nm, 8d for a complete growth cycle, which 1d for the lag phase, 2 ~ 6d logarithmic phase, 7d stabilization period, 8d decline phase, the entire growth periodic change in pH range from 6.14 to 7.67. Chlorella pyrenoidosa under in the same Algicide dosage the algicide efficiency of the lag phase is much better than the logarithmic phase dosing is off the algicide the best period in the late growth phase; CTS contained copper algicide agent of Cu 2 release and changes in the pH of the algae solution to achieve the inhibition of the growth of algae, the greater the amount of algicide effect more obvious. Algae solution for the original, the effective dosage to 200mg / L. Algicide simulate the eutrophication of water bodies found CTS contained copper algicide on the Chlorella pyrenoidosa The 96h-EC 50 12.8 mg / L, and the dosage of 20mg / L on can continue to effectively control the growth of algae, the the algicide process of residual copper is about 0.38mg / L, shows that the removal of the eutrophic water algae biological processes, CTS contained copper algicide put not cause local [Cu 2 ] is too high. The residual value is less than the maximum limit in drinking water health standards, at the same time, a short period of time in the process of algaecide the above concentration range of Cu of 2 of fisheries and aquatic ecological environment will not resulting in a large degree of hazard. Test conditions and time constraints, CTS contained copper algicide algicide effect on actual eutrophication of water samples have not been tested; toxicology tests have not been conducted fish; algaecide the impact of the the chitosan flocculation role of yet to be further study.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control
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