0. 1% solution of chitosan was studied as seed soaking agent for cotton and maize.Chitosan will help stimulate the seeds of cotton and maize for sprouting. It can also restrain thefosanum oxysporin and verticillium. t...0. 1% solution of chitosan was studied as seed soaking agent for cotton and maize.Chitosan will help stimulate the seeds of cotton and maize for sprouting. It can also restrain thefosanum oxysporin and verticillium. then inhibit the cotton wilt and maize smut. The annual out-put of cotton and maize increased by 11.80% and ,0.4%, respectively.展开更多
Method for preparation of chitosan immobilized on silica gel(CTS silica) was described. The CTS silica was used as absorbent for the absorption of nickel in water. The results showed that this absorbent had relative...Method for preparation of chitosan immobilized on silica gel(CTS silica) was described. The CTS silica was used as absorbent for the absorption of nickel in water. The results showed that this absorbent had relatively high selectivity and strong affinity to nickel. The maximum absorption capacity for nickel can reach 667 mg/g of chitosan. Factors that affect the absorption capacity, such as pH, ion strength and the presence of calcium, EDTA and the mechanism of absorption were discussed in detail. The absorbent can be regenerated with acid and reused for several times. The recovery rate for nickel can reach 99 99%. This absorbent filled in a column can be used in nickel removal from wastewater and drinking water.展开更多
A new and effective strategy was proposed for preparing new organic-inorganic composite biosorbent with spherical silica as supporting core and chitosan（CS）-based hybrid layer as shell based on sol-gel reaction and ...A new and effective strategy was proposed for preparing new organic-inorganic composite biosorbent with spherical silica as supporting core and chitosan（CS）-based hybrid layer as shell based on sol-gel reaction and simple treatment with sodium hydroxide（NaOH）. The coating layer was covalently bound on the supporting silica through polysaccharide incorporated sol-gel process starting from CS and inorganic precursor γ-glycidoxypropyltrimethoxysiloxane（GPTMS）. GPTMS had epoxide groups and cross-linked amine groups of CS to avoid its acidic solubilization. The composite biosorbent had coarse surface due to the wet phase-inversion by treating in NaOH solution. The prepared biosorbent could be used in treating electric plating wastewater.展开更多
A combination of both acid and alkali treatments was used to extract chitin from crab shell in this study. Then, a three factors (NaOH solution concentration, reaction time, reaction temperature) and three levels (35,...A combination of both acid and alkali treatments was used to extract chitin from crab shell in this study. Then, a three factors (NaOH solution concentration, reaction time, reaction temperature) and three levels (35, 45, 55; 2, 6, 10; 70, 105, 140) L 9(3 4) orthogonal experiment design is further adopted to conduct a de acetyl treatment to prepare chitosan by considering the viscosity and de acetyl degree of the chitosan as the main performance indexes. Determination of de acetyl degree of chitin complys with the procedures given by the reference and the viscosity meter was used for determination of viscosity of chitosan. The results show that the extraction of chitin shall use pulverized crab shell as the raw material and such raw material shall be immersed in 10% HCl solution for 6 hours and washed with water for one time in every 2 hours, then heated in boiled water for 2 hours by the use of 10% thin NaOH solution. Afterwards, the said material shall be washed with water to become a neutral solution and dried over a stove. When chitin is mixed with 55% NaOH solution in a proportion of 1∶10 (W/V, g/mL) and the reaction takes place at a temperature of 105℃ for 6 hours, chitosan having a de acetyl percentage of 94% and viscosity of >200 cps can be available.展开更多
Composites based on ultradispersed polytetrafluoroethylene and chitosan salts (nitrate, perchlorate and dodecahydro-closo-dodecaborate) and methods of their fabrication have been developed. For this purpose, the ultra...Composites based on ultradispersed polytetrafluoroethylene and chitosan salts (nitrate, perchlorate and dodecahydro-closo-dodecaborate) and methods of their fabrication have been developed. For this purpose, the ultrasonic effect on the mixture of the aqueous gels of chitosan salts with dry UPTHE or UPTFE ethanol dispersion with propeller agitators. Introduction of ultradispersed polytetrafluoroethylene improving their functioning properties, namely high combustion efficiency and resistance to air moisture.展开更多
文摘0. 1% solution of chitosan was studied as seed soaking agent for cotton and maize.Chitosan will help stimulate the seeds of cotton and maize for sprouting. It can also restrain thefosanum oxysporin and verticillium. then inhibit the cotton wilt and maize smut. The annual out-put of cotton and maize increased by 11.80% and ,0.4%, respectively.
文摘Method for preparation of chitosan immobilized on silica gel(CTS silica) was described. The CTS silica was used as absorbent for the absorption of nickel in water. The results showed that this absorbent had relatively high selectivity and strong affinity to nickel. The maximum absorption capacity for nickel can reach 667 mg/g of chitosan. Factors that affect the absorption capacity, such as pH, ion strength and the presence of calcium, EDTA and the mechanism of absorption were discussed in detail. The absorbent can be regenerated with acid and reused for several times. The recovery rate for nickel can reach 99 99%. This absorbent filled in a column can be used in nickel removal from wastewater and drinking water.
基金Supported by the National Natural Science Foundation of China(Nos.20775039 and 20602009)the Natural Science Founda-tion of Shandong Province of China(No.ZR2009BM031 and Q2008B05)+1 种基金the Public Welfare Project of Marine Science Research of China(Nos.200705011 and 200805039)the Science Research Fund of the First Institute of Oceanograph of China
文摘A new and effective strategy was proposed for preparing new organic-inorganic composite biosorbent with spherical silica as supporting core and chitosan（CS）-based hybrid layer as shell based on sol-gel reaction and simple treatment with sodium hydroxide（NaOH）. The coating layer was covalently bound on the supporting silica through polysaccharide incorporated sol-gel process starting from CS and inorganic precursor γ-glycidoxypropyltrimethoxysiloxane（GPTMS）. GPTMS had epoxide groups and cross-linked amine groups of CS to avoid its acidic solubilization. The composite biosorbent had coarse surface due to the wet phase-inversion by treating in NaOH solution. The prepared biosorbent could be used in treating electric plating wastewater.
文摘A combination of both acid and alkali treatments was used to extract chitin from crab shell in this study. Then, a three factors (NaOH solution concentration, reaction time, reaction temperature) and three levels (35, 45, 55; 2, 6, 10; 70, 105, 140) L 9(3 4) orthogonal experiment design is further adopted to conduct a de acetyl treatment to prepare chitosan by considering the viscosity and de acetyl degree of the chitosan as the main performance indexes. Determination of de acetyl degree of chitin complys with the procedures given by the reference and the viscosity meter was used for determination of viscosity of chitosan. The results show that the extraction of chitin shall use pulverized crab shell as the raw material and such raw material shall be immersed in 10% HCl solution for 6 hours and washed with water for one time in every 2 hours, then heated in boiled water for 2 hours by the use of 10% thin NaOH solution. Afterwards, the said material shall be washed with water to become a neutral solution and dried over a stove. When chitin is mixed with 55% NaOH solution in a proportion of 1∶10 (W/V, g/mL) and the reaction takes place at a temperature of 105℃ for 6 hours, chitosan having a de acetyl percentage of 94% and viscosity of >200 cps can be available.
文摘Composites based on ultradispersed polytetrafluoroethylene and chitosan salts (nitrate, perchlorate and dodecahydro-closo-dodecaborate) and methods of their fabrication have been developed. For this purpose, the ultrasonic effect on the mixture of the aqueous gels of chitosan salts with dry UPTHE or UPTFE ethanol dispersion with propeller agitators. Introduction of ultradispersed polytetrafluoroethylene improving their functioning properties, namely high combustion efficiency and resistance to air moisture.
