1. Integrating multi-method approaches for the green separation and retrieval of nickel and phosphorus from spent electroless nickel plating solutions.
- Author
-
Dong, Zhontian, Zhao, Zhiren, Wang, Fenghe, Wang, Fengyun, and Xia, Mingzhu
- Subjects
- *
NICKEL-plating , *PLATING baths , *PHOSPHORUS , *NICKEL , *EMISSION standards - Abstract
The spent electroless nickel plating (SENP) solution comprises abundant complexed nickel, hypophosphite, and phosphite ions, alongside scant organic additives. In this study, we introduced an innovative method that uses a combination of alkali and heat treatment-activated PMS to disrupt the nickel ion complexation, facilitating hypophosphite and phosphite oxidation, and the alkali acts as a precipitant for nickel. Consequently, nickel and phosphorus precipitated sequentially, enabling their efficient separation and recovery. With a 4 g L−1 PMS dose, the hypophosphite (H2PO2−) and phosphite (HPO32−) conversion rates reached 100% and 99.69%, respectively. After the precipitation and separation of the concentrated SENP solution, residual nickel and phosphorus levels significantly dropped to 10.91 mg L−1 and 12.29 mg L−1, respectively. Subsequently, capacitive deionization (CDI) concurrently removed nickel and phosphorus to comply with emission standard GB39731-2020. Under optimal conditions, nickel and total phosphorus removal efficiency reached 96.69% and 93.62%, respectively, and the residual concentration decreased to 0.36 mg L−1 and 0.78 mg L−1, respectively. This innovative, streamlined strategy was proposed for the green treatment and recovery of nickel and phosphorus resources from spent electroless nickel plating solutions. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF