scholarly journals Improved Thermoelectric Performance through Double Substitution in Shandite-Type Mixed-Metal Sulfides

2019 ◽  
Vol 3 (3) ◽  
pp. 2168-2174 ◽  
Author(s):  
Panagiotis Mangelis ◽  
Paz Vaqueiro ◽  
Anthony V. Powell
Keyword(s):  
Thermoelectric Performance ◽  
Metal Sulfides ◽  
Mixed Metal ◽  
Double Substitution

scholarly journals Recent Advances on Mixed Metal Sulfides for Advanced Sodium‐Ion Batteries

2020 ◽  
Vol 32 (42) ◽  
pp. 2002976 ◽  
Author(s):  
Yongjin Fang ◽  
Deyan Luan ◽  
Xiong Wen (David) Lou
Keyword(s):  
Sodium Ion ◽  
Metal Sulfides ◽  
Sodium Ion Batteries ◽  
Mixed Metal ◽  
Recent Advances

Formation of mixed metal sulfides of NixCu1−xCo2S4 for high-performance supercapacitors

2019 ◽  
Vol 836 ◽  
pp. 134-142 ◽  
Author(s):  
Wenqiang Chen ◽  
Pengwei Yuan ◽  
Songhao Guo ◽  
Suqin Gao ◽  
Jiao Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Metal Sulfides ◽  
Mixed Metal

Lignin‐derived carbon nanofibers‐laminated redox‐active ‐mixed metal sulfides for high‐energy rechargeable hybrid supercapacitors

2020 ◽  
Author(s):  
Kugalur Shanmugam Ranjith ◽  
Ganji Seeta Rama Raju ◽  
Nilesh R. Chodankar ◽  
Seyed Majid Ghoreishian ◽  
Young Lok Cha ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
High Energy ◽  
Metal Sulfides ◽  
Mixed Metal ◽  
Hybrid Supercapacitors ◽  
Redox Active

Effect of cobalt additives and mixed metal sulfides at rubber–brass interface on rubber adhesion: a computational study

2017 ◽  
Vol 136 (2) ◽  
Author(s):  
Chian Ye Ling ◽  
Janne T. Hirvi ◽  
Mika Suvanto ◽  
Andrey S. Bazhenov ◽  
Katriina Markkula ◽  
...  
Keyword(s):  
Computational Study ◽  
Metal Sulfides ◽  
Mixed Metal

scholarly journals Sulfuration treatment of electroplating wastewater for selective recovery of copper, zinc and nickel resource

2013 ◽  
Vol 8 (2) ◽  
pp. 131-136
Keyword(s):  
Ph Value ◽  
Metal Sulfides ◽  
Mixed Solution ◽  
Resource Saving ◽  
Selective Precipitation ◽  
Selective Recovery ◽  
Mixed Metal ◽  
Copper Zinc ◽  
Recycle And Reuse ◽  
Electroplating Process

In the electroplating process, various metal salts are used and the residues on the surface of electroplated materials are rinsed out as wastewater, followed by hydration in a wastewater disposal step. Although a variety of metals are concentrated in the sludge, the mixed heterogeneous state of these metals in sludge makes it difficult to recycle and reuse them. From the viewpoint of environmental protection as well as resource saving, effective methods for recycling and reuse of these mixed metal sludge are required to be developed urgently. In the present work, selective recovery of the metals from mixed-metal wastewater by sulfuration treatment is proposed. Sulfuration treatment is characterized by low solubility of metal sulfides; metal sulfides are, in general, lower in solubility than that of metal hydroxides. For the experiments, three metals of copper, zinc and nickel which are commonly used in the electroplating process were chosen. Separation of these metals from the mixed solution in various pH ranges was conducted by employing three sulfurating agents: sodium sulfide (Na2S), sodium disulfide (Na2S2) and sodium tetrasulfide (Na2S4). Aqueous solutions of CuSO4, ZnSO4 and NiSO4 and those of real plating wastewater, of which the initial concentrations were adjusted to 100-300 mg dm-3 were employed. By sulfuration treatment of the simulated solution using each sulfurating agent without adjusting pH, CuS was first precipitated, but ZnS and NiS were also precipitated at the same time. In addition, pH value increased with the amount of sulfurating agents in the solution. The results demonstrated that the formation behavior of metal precipitates depended on pH value of the solution. For the sulfuration with three kinds of sulfurating agents, copper was first separated from the solution as CuS in pH=1.4-1.5, then ZnS was precipitated in pH=2.4-2.5, followed by the precipitation of nickel sulfide, NiS in the residual solution at pH=5.5-6.0. It was also found that Na2S is most effective for selective precipitation of metal sulfides, among the three sulfurating agents of Na2S, Na2S2 and Na2S4. The selectivity of CuS in the filtrated cake obtained by the sulfuration treatment in pH=1.4-1.5 was about 94 % and was sufficiently high, in terms of allowable metal content level for recycling. The sequent selectivity of ZnS and NiS in the cake after the sulfuration treatment in pH=2.4-2.5 were 75-77 % and about 20 %, respectively. The selectivity of NiS and ZnS in the cake after the sulfuration treatment in pH=5.5-6.0 was 64-66 % and 33-35 %, respectively.

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