Graft copolymerization of acrylamide onto starch and reaction with mercaptoacetic acid subsequently were studied.The reaction product(St-AM-MCAA) was used in the treatment of wastewater containing low concentration ca...Graft copolymerization of acrylamide onto starch and reaction with mercaptoacetic acid subsequently were studied.The reaction product(St-AM-MCAA) was used in the treatment of wastewater containing low concentration cadmium ion(0.40 mg·L-1) as additive.An investigation was carried out to study the effect of St/AM(mass ratio of starch to acrylamide) on the grafting ratio and grafting efficiency and the content of thiol(SH) group.It was found that the cadmium ion removal percentage by St-AM-MCAA3 reached 89.7% and the residual concentration of cadmium ion in treated water was under 0.10 mg·L-1 in the conditions of pH=8 and additive concentration of 2.0 g·L-1 by selecting a high grafting ratio and thiol content product St-AM-MCAA3 as additive.The ability of St-AM-MCAA3 to remove low concentration wastewater containing cadmium ion was higher than that of St-AM3 by 10%.展开更多
A NOS gene electrochemical biosensor was prepared by covalently immobilizing of NOS ssDNA sequence on the mercaptoacetic acid monolayer self-assembled gold electrode with the help of N-（3-dimethylaminopropyl）-N’-et...A NOS gene electrochemical biosensor was prepared by covalently immobilizing of NOS ssDNA sequence on the mercaptoacetic acid monolayer self-assembled gold electrode with the help of N-（3-dimethylaminopropyl）-N’-ethylcarbodiimide hydrochloride（EDC）and N-hydroxysuccinimide（NHS）.By using methylene blue as the electrochemical indicator,the increase of cathodic peak current was in linear with the concentration of complementary ssDNA in the concentration range of 5.0×10-8 1.0×10-4 mol/L with the linear regression equation as ΔI pc=1.10lgc+8.25（n=8,γ=0.998 5）and the detection limit as 3.60×10-8 mol/L（3σ）.展开更多
文摘Graft copolymerization of acrylamide onto starch and reaction with mercaptoacetic acid subsequently were studied.The reaction product(St-AM-MCAA) was used in the treatment of wastewater containing low concentration cadmium ion(0.40 mg·L-1) as additive.An investigation was carried out to study the effect of St/AM(mass ratio of starch to acrylamide) on the grafting ratio and grafting efficiency and the content of thiol(SH) group.It was found that the cadmium ion removal percentage by St-AM-MCAA3 reached 89.7% and the residual concentration of cadmium ion in treated water was under 0.10 mg·L-1 in the conditions of pH=8 and additive concentration of 2.0 g·L-1 by selecting a high grafting ratio and thiol content product St-AM-MCAA3 as additive.The ability of St-AM-MCAA3 to remove low concentration wastewater containing cadmium ion was higher than that of St-AM3 by 10%.
文摘A NOS gene electrochemical biosensor was prepared by covalently immobilizing of NOS ssDNA sequence on the mercaptoacetic acid monolayer self-assembled gold electrode with the help of N-（3-dimethylaminopropyl）-N’-ethylcarbodiimide hydrochloride（EDC）and N-hydroxysuccinimide（NHS）.By using methylene blue as the electrochemical indicator,the increase of cathodic peak current was in linear with the concentration of complementary ssDNA in the concentration range of 5.0×10-8 1.0×10-4 mol/L with the linear regression equation as ΔI pc=1.10lgc+8.25（n=8,γ=0.998 5）and the detection limit as 3.60×10-8 mol/L（3σ）.
