[Simultaneous remediation of Cr (VI) and p-NCB by nanosacle iron].
Nanoscale Fe and Ni/Fe, which were prepared by chemical deposition, were utilized as catalyst for remediation of Cr(VI) and pNCB in contaminated water. The interactions between Cr( VI) and p-NCB in contaminated water during the simultaneous remediation process were analyzed. It is demonstrated from the experiment that p-NCB can be degradated into p-CAN by nanoscale iron, but cannot exhibit the effect of dechlorination, and that there is a competitive relationship between Cr( VI) and p-NCB in the remediation process. The nanoscale Nil Fe bimetals could be applied in simultaneous remediation of p-NCB with Cr( VI) and give rise to a good remediation efficiency, where the products are only Cr(III) and p-CAN without any intermediate products. It was found that the conditions of higher Ni(II) concentration can promote the degradation rate of p-NCB. The optimum Ni/Fe ratio is 1:50. Whereas, the higher concentrations of Cr(VI) and p-NCB will lead to the lower degradation rate. Under the condition that concentration of Cr (VI) was 20 mg/L, the corresponding maximum dechlorination of p-NCB was 43.0%; under the condition that concentration of p-NCB was 40 mg/L, the corresponding maximum removal efficiency of Cr(VI) was 71.4%.
Niu
Shao-feng
SF
School of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, China. niu_sf@163.com
Li
Chun-hui
CH
Lou
Zhang-hua
ZH
Xu
Yue-ping
YP
D002384:Catalysis; D002857:Chromium / Q000302:isolation & purification*; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D009578:Nitrobenzenes / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*; D014881:Water Supply
D009578:Nitrobenzenes; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D009532:Nickel; C010407:4-chloronitrobenzene; D007501:Iron