Selective separation and recovery of silver and copper from mixtures by photocatalysis

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744096
Author(s):  
Mali Ding ◽  
Weijun Zhang ◽  
Zhaofeng Xie ◽  
Rihua Lei ◽  
Jianfang Wang ◽  
...  
Keyword(s):  
Metal Ions ◽  
Ethylene Diamine Tetraacetic Acid ◽  
Uv Light ◽  
Electronic Waste ◽  
Experimental Results ◽  
Tetraacetic Acid ◽  
Selective Recovery ◽  
Valuable Metals ◽  
Effects Of Ph ◽  
Environmental Importance

Separation and recovery of valuable metals including silver (Ag) and copper (Cu) from electronic waste mixtures are of great economic and environmental importance. Recent years, semiconductor photocatalysts have been investigated intensively for the removal of Ag from wastewater. Few studies have been carried out on the effect of pH and co-exist metal ions such as Cu on Ag. In this study, ZnO and TiO2 were applied as photocatalysts to target on the selective recovery Ag and Cu from its mixtures under UV light. The effects of pH, catalyst, ethylene-diamine tetraacetic acid (EDTA) on the Ag and Cu photo-reduction were studied. Modeling of Ag[Formula: see text] and Cu[Formula: see text] with and without EDTA distribution together with metal precipitations was plotted against pH to understand the chemistry involved in photocatalysis. Experimental results showed that Ag[Formula: see text] photo-reduction was nearly completed by ZnO and TiO2 to Ag metal, while Cu[Formula: see text] photo-reduction to Cu2O only occurs by ZnO in the presence of EDTA. This work illustrates that semiconductor photocatalysts are suitable for selective recovery of Ag and Cu from wastewaters.

scholarly journals Selective recovery of valuable metals from crushed electronic waste

2018 ◽  
Vol 411 ◽  
pp. 012011
Author(s):  
Z M Akhmetvaliyeva ◽  
N A Kulenova ◽  
Ya Takasaki ◽  
S V Mamyachenkov ◽  
O S Anisimova ◽  
...  
Keyword(s):  
Electronic Waste ◽  
Selective Recovery ◽  
Valuable Metals

Efficient Preconcentration of Cu2+, Zn2+ and Fe3+ with an Agarose-Schiff Base Sorbent

2007 ◽  
Vol 72 (7) ◽  
pp. 908-916 ◽  
Author(s):  
Payman Hashemi ◽  
Hatam Hassanvand ◽  
Hossain Naeimi
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Metal Ion ◽  
Good Accuracy ◽  
Kinetic Studies ◽  
Sample Volume ◽  
Effects Of Ph ◽  
Glass Column ◽  
High Concentrations ◽  
Ph Range

Sorption and preconcentration of Cu2+, Zn2+ and Fe3+ on a salen-type Schiff base, 2,2'- [ethane-1,2-diylbis(nitrilomethylidyne)]bis(2-methylphenol), chemically immobilized on a highly crosslinked agarose support, were studied. Kinetic studies showed higher sorption rates of Cu2+ and Fe3+ in comparison with Zn2+. Half-times (t1/2) of 31, 106 and 58 s were obtained for sorption of Cu2+, Zn2+ and Fe3+ by the sorbent, respectively. Effects of pH, eluent concentration and volume, ionic strength, buffer concentration, sample volume and interferences on the recovery of the metal ions were investigated. A 5-ml portion of 0.4 M HCl solution was sufficient for quantitative elution of the metal ions from 0.5 ml of the sorbent packed in a 6.5 mm i.d. glass column. Quantitative recoveries were obtained in a pH range 5.5-6.5 for all the analytes. The volumes to be concentrated exceeding 500 ml, ionic strengths as high as 0.5 mol l-1, and acetate buffer concentrations up to 0.3 mol l-1 for Zn2+ and 0.4 mol l-1 for Cu2+ and Fe3+ did not have any significant effect on the recoveries. The system tolerated relatively high concentrations of diverse ions. Preconcentration factors up to 100 and detection limits of 0.31, 0.16 and 1.73 μg l-1 were obtained for Cu2+, Zn2+ and Fe3+, respectively, for their determination by a flame AAS instrument. The method was successfully applied to the metal ion determinations in several river water samples with good accuracy.

Synergic Mechanisms on Carbon and Sulfur during the Selective Recovery of Valuable Metals from Spent Lithium-Ion Batteries

2021 ◽  
Vol 9 (5) ◽  
pp. 2271-2279
Author(s):  
Ping Xu ◽  
Chunwei Liu ◽  
Xihua Zhang ◽  
Xiaohong Zheng ◽  
Weiguang Lv ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Selective Recovery ◽  
Valuable Metals

The Effect of Organic Matter and Organic Acid on the Chromium Release in Sediment

2014 ◽  
Vol 1081 ◽  
pp. 88-92
Author(s):  
Hui Liu ◽  
Jiu Lan Dai
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Citric Acid ◽  
Organic Acid ◽  
Ethylene Diamine Tetraacetic Acid ◽  
Soluble Starch ◽  
Optimal Dosage ◽  
Tetraacetic Acid ◽  
Adsorption Time ◽  
Chromium Release

Effect of organic matter and organic acid on the heavy metals, especially, chromium (Cr) release in the sediment was researched. Glucose and soluble organic starch was used as organic matter, as well, citric acid and ethylene diamine tetraacetic acid (EDTA) were simulated as organic acid. The results showed that best adsorption time of glucose on Cr was 5h, the optimal dosage was 0.1g g-1; best adsorption time of organic soluble starch was 4h, and the optimum adding amount of 0.08g/g; best adsorption time of citric acid was 5h, the best concentration 0.005mol g-1; optimal adsorption time of organic acid EDTA was 3h, the optimum adding amount of 0.12g g-1. Glucose, soluble starch and citric acid significantly effected on the release of Cr in the sediment, however, influence of EDTA on the release of Cr was not so evident.

scholarly journals A Review on Metal Ions Modified TiO2 for Photocatalytic Degradation of Organic Pollutants

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1039
Author(s):  
Dafu Jiang ◽  
Tunmise Ayode Otitoju ◽  
Yuanyuan Ouyang ◽  
Noor Fazliani Shoparwe ◽  
Song Wang ◽  
...  
Keyword(s):  
Metal Ions ◽  
Active Sites ◽  
Crystal Surface ◽  
Uv Light ◽  
Photogenerated Electron ◽  
Tio2 Photocatalyst ◽  
Electron Hole ◽  
Visible Light Range ◽  
Low Toxicity ◽  
High Chemical Stability

TiO2 is a semiconductor material with high chemical stability and low toxicity. It is widely used in the fields of catalysis, sensing, hydrogen production, optics and optoelectronics. However, TiO2 photocatalyst is sensitive to ultraviolet (UV) light; this is why its photocatalytic activity and quantum efficiency are reduced. To enhance the photocatalytic efficiency in the visible light range as well as to increase the number of the active sites on the crystal surface or inhibit the recombination rate of photogenerated electron–hole pairs electrons, various metal ions were used to modify TiO2. This review paper comprehensively summarizes the latest progress on the modification of TiO2 photocatalyst by a variety of metal ions. Lastly, the future prospects of the modification of TiO2 as a photocatalyst are proposed.

scholarly journals Pemberian Pakan Hijauan Lokal yang Disuplementasi Indigofera dan Probiotik terhadap Total Leukosit dan Diferensial Leukosit Kambing Boerka

2021 ◽  
Vol 10 (3) ◽  
pp. 365-374
Author(s):  
Dheadora Florensia ◽  
I Wayan Batan ◽  
Tjokorda Sari Nindhia
Keyword(s):  
Ethylene Diamine Tetraacetic Acid ◽  
Ethylene Diamine ◽  
Tetraacetic Acid ◽  
Hematology Analyzer

Pemberian pakan yang berbeda dapat menyebabkan perbedaan kondisi fisiologis. Apabila tubuh ternak mengalami perubahan fisiologi, maka dapat berpengaruh pada gambaran darah. Pemeriksaan darah lengkap dilakukan untuk mengetahui status kesehatan hewan, terutama pemeriksaan leukosit yang digunakan untuk penunjang diagnosis terhadap suatu penyakit dan mengetahui adanya respons tubuh terhadap suatu penyakit infeksi. Penelitian ini bertujuan untuk mengetahui profil leukosit kambing boerka yang diberi pakan hijauan lokal dan Indigofera serta probiotik Sampel yang digunakan adalah sampel darah dari 24 ekor kambing boerka betina. Perlakuan yang diberikan adalah pemberian pakan hijauan sebagai kontrol (P0), pakan hijauan yang diimbuhi Indigofera (P1) dan pakan hijauan yang diimbuhi Indigofera dan Bio-CAS (P2). Pengambilan darah dilakukan pada vena jugularis setelah diberi perlakuan pakan selama enam bulan. Darah dimasukkan ke dalam tabung yang berisi antikoagulan Ethylene Diamine Tetraacetic Acid (EDTA). Pemeriksaan gambaran total dan diferensial sel darah putih secara otomatis menggunakan Hematology Analyzer. Hasil penelitian menunjukkan pemberian pakan hijauan lokal yang disuplementasi Indigofera dan probiotik tidak berpengaruh nyata terhadap nilai total leukosit dan diferensial leukosit kambing boerka. Berdasarkan hasil penelitian ini dapat disimpulkan bahwa pemberian pakan hijauan lokal yang disuplementasi indigofera dan probiotik aman diberikan pada kambing boerka.

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