2 acrylamide 2 methylpropanesulfonic acid

Acrylamide (AM, 99%), acrylic(AA, 98%), N-vinyl pyrrolidone (NVP, 98%), 2-Acrylamide-2-methylpropanesulfonic acid (AMPS, industrial grade), pentaerythritol triallyl ether (PTE, 99%), cetyl dimethylallyl ammonium chloride (C₁₆DMAAC, 80%), potassium formate (HCOOK, industrial grade), sodium hydroxide (NaOH, AR), sodium carbonate (Na₂CO₃, AR), potassium persulfate (KPS, AR), sodium bisulfite (NaHSO₃, AR), all the above materials were purchased from Shanghai Macklin Biochemical Co. LTD, China and were used without any further purification. Seawater is prepared by artificial seawater as Table 1.Table 1

Artificial seawater formulation.

Substances	Concentration (g/L)
NaCl	21.86 ± 0.01
Na2SO4	3.23 ± 0.01
MgCl2	4.53 ± 0.01
CaCl2	0.93 ± 0.01
KCl	0.64 ± 0.01
NaHCO3	0.17 ± 0.01
Na2CO3	0.02 ± 0.01

The materials included acrylamide (AM, Shanghai Macklin Biochemical Co. LTD, China, 99%), sorbitan monooleate (Span80, Tianjin Guangfu Fine Chemical Research Institute, China, AR), 1-vinyl-2-pyrrolidinon (NVP, Tokyo Chemical Industry Limited Company, 99%), 2-acrylamide-2-methylpropanesulfonic acid (AMPS, Shanghai Macklin Biochemical Co. LTD, 98.0%), N,N-methylene bis acrylamide (MBA, Mclean, AR), potassium persulfate (KPS, Tianjin Fuchen Chemicals, AR), methylthionine chloride (Shanghai Macklin Biochemical Co. LTD, 90.0%), partially hydrolyzed polyacrylamide (HPAM, hydrolysis degree about 25.2%), and zirconium acetate (Shanghai Macklin Biochemical Co. LTD, Zr 15–16%). All of the above materials were used without any further purification. Deionized water was filtrated through microporous cellulose membranes with a pore size of 0.22 μm. Nuclear pore membranes with 0.4 μm pores and a thickness of 10 μm were provided by the China Institute of Atomic Energy.