Journal of Cleaner Production
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2022
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IF 11.072
Jianyong Che,Wenjuan Zhang,Baozhong Ma,Chengyan Wang
A succinct process for recovering Cu from acidic waste etchant (AWE) was developed in this work, which included recycling Cu via oxalate precipitation, preparing CuO nanoparticles by thermal decomposing the precipitate, and recovering NaCl via evaporation crystallization. A comparison of copper precipitation by H 2 C 2 O 4 and Na 2 C 2 O 4 suggested that an efficient recovery efficiency of Cu was obtained by Na 2 C 2 O 4 (∼99%), which was higher than that by H 2 C 2 O 4 (80.31%). Through thermodynamic analysis, a H + -release mechanism was proposed to explain the significant difference in copper precipitation between Na 2 C 2 O 4 and H 2 C 2 O 4 . By parameter optimization, 99.8% of Cu was recovered without adjusting pH value under optimal conditions, such as temperature of 40 °C, sodium oxalate of 1.2 mol/mol, and reaction time of 2 h. Furthermore, CuO nanoparticles with a purity of 99.92% and particle size of 30 nm were prepared, and the phase transformation of Cu was investigated in-depth using X-ray diffraction (XRD), Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectrum (FT-IR). Finally, the chloride ions were recovered as NaCl at 99.51% purity. This study provides a potential route to deal with strongly acidic waste etchant and achieve its high-value utilization.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2019
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IF 1.911
Fanglu Yuan,Lele Cui,Peipei Ding,Wenheng Jing
Electrochemical technologies for the on-site treatment of spent acid etchant have received great attention due their ease of operation and economic benefits. On the other hand, a large amount of Cl 2 is generated during the electrolysis process, which leads to potential environmental risks. In the present work, a novel three-compartment ceramic membrane flow reactor, including a cathode chamber, an anode chamber, and a gas absorption chamber was developed. The three chambers were divided by an Al 2 O 3 ceramic membrane and a breathable hydrophobic anode diffusion electrode (ADE). The Cl 2 evolution onset potential of the ADE was increased to 1.19 V from 1.05 V of the graphite felt, effectively inhibiting the chlorine evolution reaction (CER). The anode-generated Cl 2 diffused into the gas absorption chamber through the ADE and was eventually consumed by the H 2 O 2 adsorbent. Cu could be recovered without emitting chlorine due to the special structure of reactor. The current efficiency of copper precipitation and cathode reduction from Cu 2+ to Cu + reached 97.7% at a working current of 150 mA. These results indicated that the novel membrane reactor had high potential for application in the copper recovery industry.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Waste and Biomass Valorization
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2020
·Vol. 11
·期 12
·6967-6979
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IF 2.851
Yao Yuan,Hou Hongying,Liu Xianxi,Meng Kun,Qiu Jinxu,Wang Lei,Zhu Jing
Abstract Abstract In this work, copper l -phenylalanine (abbreviated as Cu(L-Phe) 2 ) complex was extracted from the waste acid Cu-printed-circuit-board (Cu-PCB) etchant via a one-step facile liquid phase precipitate reaction for the first time. The corresponding application feasibility in lithium-ion battery (LIB) and the electrochemical Li-storage mechanism were also explored. The resultant Cu(L-Phe) 2 complex displayed a nanosheet-like morphology with 200 nm in thickness. When it was used as the anode active material of LIB, the reversible discharge specific capacities were 231.1 mAh/g at 100 mA/g and 47.2 mAh/g at 5 A/g, respectively. Furthermore, with the help of surfactant sodium dodecyl sulfate (SDS), Cu(L-Phe) 2 complex nanosheets rearranged into the orderly flower-like cluster with a diameter of 13 μm; correspondingly, the reversible discharge specific capacities also increased to about 278.8 mAh/g and 108.8 mAh/g, respectively, implying higher reversibility and cycle performance. Seemingly, orderly flower-like nanosheets clusters with the hierarchical structure may facilitate to modify the electrochemical Li-storage capacity of Cu(L-Phe) 2 complex anode. Clearly, the satisfactory results may open a new path to develop the circular economy mode of acid waste Cu-PCB etchant, which is very important for environmental protection and sustainable development. Graphic Abstract
研究领域:
材料科学
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环境科学
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电化学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
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2018
·Vol. 20
·期 20
·4710-4718
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IF 8.586
Mingming Zhou,Chaolin Li,Haijian Luo,Jingwen Wang,Xue Sun
A laboratory scale closed-loop cycle system for the complete regeneration of sodium persulfate/sulfuric acid etching solution (SPS) has been developed by anode oxidation of sulfate paired to cathode reduction of copper. A current-efficient (110%), zero-chemical dosage and zero-emission strategy for complete regeneration of SPS and recovery of copper was achieved. The micro-etching rate of the recycled SPS has no significant difference compared with that of the fresh SPS. On average, the cost of etching in this recycling system is decreased by 100%, compared with that in the current printed circuit boards used in industries. The full utilization of spent SPS realizes waste to wealth conversion in the true sense. The developed recycling system is a techno-economically feasible, environmentally friendly, sustainable, clean and green process for the reuse of SPS and recovery of valuable metal Cu through electrooxidation of sulfate paired to electroreduction of copper.
研究领域:
电化学
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环境工程
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材料科学
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废物管理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）