Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (7): 0-070301-7.doi: 10.11889/j.0253-3219.2019.hjs.42.070301

• NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE •    

Fe3+ loaded resin for removal of Ag colloid by oxidation method from waste water

Enxi GU,Lingxiao FU,Huan WANG   

  1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2019-03-25 Revised:2019-05-14 Online:2019-07-10 Published:2019-07-16
  • About author:GU Enxi, female, born in 1990, graduated from University of South China in 2013, master student, focusing on nuclear technology
  • Supported by:
    Supported by National Natural Science Foundation of China(No.11675103)

Abstract: Background

Ag colloids is a hazard to the environment, but little attention has been paid to the research on its removal from waste water.

Purpose

This study aims to make a Fe3+ modified resin for removing Ag colloids from aqueous solution, and to investigate its adsorption behavior on Ag colloids.

Methods

The adsorption behavior of Ag colloids on the modified resin was studied by dynamic tests, and it was used as a function of pH value, adsorbent dosage, adsorption time and initial concentration. Both the X-ray fluorescence (XRF) and the X-ray photoelectric spectroscopy (XPS) were employed to test the effect of this approach.

Results

In the batch adsorption experiment of Ag colloids, under neutral conditions, the removal efficient of Ag in 20×10-6 solution of modified resin of 6.67 mg?mL-1 was up to 92.5%, and the adsorption process reached dynamic equilibrium in 6 h.

Conclusions

The adsorption process agreed to the typical Langmuir model and the pseudo-second-order kinetic model. XRF result showed that Na+ existing in the D001 resin was totally exchanged by the Fe3+. XPS analysis indicated that the modified resin was decorated to Ag+, Fe3+ and Fe2+ after absorbing the Ag collide solution. Apparently, Ag was oxidized to Ag+ and Fe3+ was reduced to Fe2+ in the adsorption process, which implied that the adsorption mechanism was ion exchange.

Key words: Ag colloid, Redox adsorption, Loading Fe3+, Modified resin

CLC Number: 

  • TL941