Highly Selective Adsorption Resins. I. Preparation of Chitosan Derivatives Containing 2-Pyridylmethyl, 2-Thienylmethyl, and 3-(Methylthio)propyl Groups and Their Selective Adsorption of Precious Metals

1996 ◽  
Vol 69 (5) ◽  
pp. 1255-1260 ◽  
Author(s):  
Yoshinari Baba ◽  
Yoshinobu Kawano ◽  
Hiroyuki Hirakawa
Keyword(s):  
Selective Adsorption ◽  
Precious Metals ◽  
Chitosan Derivatives

Selective Adsorption of Precious Metals on Sulfur-Containing Chitosan Derivatives

1994 ◽  
Vol 23 (1) ◽  
pp. 117-120 ◽  
Author(s):  
Yoshinari Baba ◽  
Hiroyuki Hirakawa ◽  
Yoshinobu Kawano
Keyword(s):  
Selective Adsorption ◽  
Precious Metals ◽  
Chitosan Derivatives ◽  
Sulfur Containing

Recovery of Precious Metals by Selective Adsorption on Dimethylamine-Modified Persimmon Peel

2010 ◽  
Vol 1 (3) ◽  
pp. 339-345 ◽  
Author(s):  
Ying Xiong ◽  
Chaitanya Raj Adhikari ◽  
Hidetaka Kawakita ◽  
Keisuke Ohto ◽  
Hiroyuki Harada ◽  
...  
Keyword(s):  
Selective Adsorption ◽  
Precious Metals

Thiol functionalized mesoporous silicas for selective adsorption of precious metals

2012 ◽  
Vol 35 ◽  
pp. 20-26 ◽  
Author(s):  
Huajun Zheng ◽  
Denghong Hu ◽  
Lei Zhang ◽  
Chun’an Ma ◽  
Tom Rufford
Keyword(s):  
Selective Adsorption ◽  
Precious Metals ◽  
Mesoporous Silicas

scholarly journals Selective Adsorption of Mercury(II) on Chitosan Derivatives from Hydrochloric Acid.

1998 ◽  
Vol 14 (4) ◽  
pp. 687-690 ◽  
Author(s):  
Yoshinari BABA ◽  
Naohiko MATSUMURA ◽  
Kohichiro SHIOMORI ◽  
Yoshinobu KAWANO
Keyword(s):  
Hydrochloric Acid ◽  
Selective Adsorption ◽  
Chitosan Derivatives

Selective adsorption of precious metals from hydrochloric acid solutions using porous carbon prepared from barley straw and rice husk

2009 ◽  
Vol 22 (15) ◽  
pp. 1277-1282 ◽  
Author(s):  
Rumi Chand ◽  
Takanori Watari ◽  
Katsutoshi Inoue ◽  
Hidetaka Kawakita ◽  
Hom Nath Luitel ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Rice Husk ◽  
Porous Carbon ◽  
Selective Adsorption ◽  
Precious Metals ◽  
Barley Straw ◽  
Acid Solutions ◽  
Hydrochloric Acid Solutions

scholarly journals Selective Gold and Palladium Adsorption from Standard Aqueous Solutions

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1282
Author(s):  
Paolo Trucillo ◽  
Ernesto Di Maio ◽  
Amedeo Lancia ◽  
Francesco Di Natale
Keyword(s):  
Aqueous Solutions ◽  
Activated Carbons ◽  
Selective Adsorption ◽  
Continuous Production ◽  
Precious Metals ◽  
Base Metals ◽  
Intensive Exploitation ◽  
Copper Gold ◽  
Glassy Materials ◽  
Pre Treatment

The intensive exploitation of resources on a global level has led to a progressive depletion of mineral reserves, which were proved to be insufficient to meet the high demand for high-technological devices. On the other hand, the continuous production of Waste from Electrical and Electronic Equipment (WEEE) is causing serious environmental problems, due to the complex composition of WEEE, which makes the recycling and reuse particularly challenging. The average metal content of WEEE is estimated to be around 30% and varies depending on the manufacturing period and brand of production. It contains base metals and precious metals, such as gold and palladium. The remaining 70% of WEEEs is composed of plastics, resins, and glassy materials. The recovery of metals from WEEEs is characterized by two main processes well represented by the literature: Pyrometallurgy and hydrometallurgy. Both of them require the pre-treatment of WEEEs, such as dismantling and magnetic separation of plastics. In this work, the selective adsorption of precious metals has been attempted, using copper, gold, and palladium aqueous solutions and mixtures of them. A screening on different adsorbent materials such as granular activated carbons and polymers, either as pellets or foams, has been performed. Among these, PolyEther Block Amide (PEBA) was elected as the most performing adsorbent in terms of gold selectivity over copper. Spent PEBA has been then characterized using scanning electron microscope, coupled with energy dispersive spectroscopy, demonstrating the predominant presence of gold in most analyzed sites, either in the pellet or foam form.

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