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S・ZVI Particles were prepared by zervalent iron and NaS under anaerobic conditions, and the influence factors on the treatment of methylene blue wastewater were studied・ The results show that the surface of S-ZVI is rough with a sulfide film and has a shell core structure. The methylene blue removal rate of S-ZVI particles firstly increased and then decreased with the increase of S/Fe ratio. When the S/Fe ratio was 0・ 025, the methylene blue removal effect was the best, the removal rate was 98. 02%, and the overall reaction reached the adsorption equilibrium in 150 min, and it follows pseudo second order kinetic reaction・ The optimal pH of S・ZVI for methylene blue wastewater removal is between 6 and 8・ The removal rate of methylene blue under aerobic condition is 1 ・ 46 times that of anaerobic condition. The presence of oxygen helps to improve the removal effect of S-ZVI on methylene blue. [ABSTRACT FROM AUTHOR]

In this study, CMC-modified nano-Fe /Ni bimetallic materials were prepared to investigate the influence factors of CMC-nano-Ni-Fe bimetallic materials on the removal of p-nitrophenol from water. The results showed that the PNP removal efficiency of the material first increased and then decreased with the increase of nickel-iron ratio, and the optimal nickel-iron ratio was 0.025.With the increase of the initial concentration of PNP, the concentration first increased and then decreased, and the optimal concentration was 30 mg/L. The reaction is greatly affected by pH, and the removal rate of PNP is acidic ＞ neutral ＞ basic. When the pH is 5, the removal rate of PNP can reach 100% after 120 minutes of reaction. The infrared spectrum of CMC-Fe/Ni composite shows that the vibration absorption peak of CMC functional group decreases with the increase of Ni/Fe ratio, but the overall structure is relatively stable. [ABSTRACT FROM AUTHOR]