Journal
CHEMOSPHERE
Volume 271, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.129861
Keywords
Electroplating; Circular economy; Low-cost adsorbents; Resource recovery; Zero-waste
Categories
Funding
- Doctoral research initiation fund of Suzhou University [2019jb14]
- University students' innovation and entrepreneurship program of Anhui Province [201910379169]
- University students' innovation and entrepreneurship program of China [202010379015]
- Shared Instrument Platform of College of the Environment & Ecology of the Xiamen University
- TWAS-Elsevier Foundation [FR3240292438]
- TYAN of the World Academy of Sciences [FR3240304540]
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This study successfully incorporated technological values into the Zn2Cr-layered double hydroxide, synthesized from unused resources, for the removal of pyrophosphate in electroplating wastewater. Through mechanisms such as ion exchange, the Zn2Cr-LDH showed almost complete removal of PP under optimized conditions, with efficient regeneration of the waste material, meeting environmental standards.
This work incorporated technological values into Zn2Cr-layered double hydroxide (LDH), synthesized from unused resources, for removal of pyrophosphate (PP) in electroplating wastewater. To adopt a resource recovery for the remediation of the aquatic environment, the Zn2Cr-LDH was fabricated by co-precipitation from concentrated metals of plating waste that remained as industrial by-products from metal finishing processes. To examine its applicability for water treatment, batch experiments were conducted at optimum M2+/M3+, pH, reaction time, and temperature. To understand the adsorption mechanisms of the PP by the adsorbent, the Zn2Cr-LDH was characterized using Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) analyses before and after adsorption treatment. An almost complete PP removal was attained by the Zn2Cr-LDH at optimized conditions: 50 mg/L of PP, 1 g/L of adsorbent, pH 6, and 6 h of reaction. Ion exchange controlled the PP removal by the adsorbent at acidic conditions. The PP removal well fitted a pseudo-second-order kinetics and/or the Langmuir isotherm model with 79 mg/g of PP adsorption capacity. The spent Zn2Cr-LDH was regenerated with NaOH with 86% of efficiency for the first cycle. The treated effluents could comply with the discharge limit of <1 mg/L. Overall, the use of the Zn2Cr-LDH as a low-cost adsorbent for wastewater treatment has contributed to national policy that promotes a zero-waste approach for a circular economy (CE) through a resource recovery paradigm. (C) 2021 Elsevier Ltd. All rights reserved.
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