Keywords:Paper industry waste materials Pyrolysis Adsorbent This paper deals with the removal of Cu 2+ from water using adsorbent materials prepared from paper industry waste materials (one de-inking paper sludge and other sludge from virgin pulp mill). Experimental results showed that de-inking paper sludge leads to mesoporous materials (V mic /Vr = 0.13 and 0.14), whereas the sludge from virgin pulp mill produces high microporous adsorbents (V m j C /V T = 0.39 and 0.41). Adsorbent materials were then used for Cu 2+ removal from water at acid pH. During water treatment, heavy metals lixiviation from adsorbent materials was not produced. However, important Ca and Mg leaching was observed. Final pH significantly increases after treatment of water with adsorbent materials probably due to their elevated CaCCb content. In general, highest Cu 2+ removal was obtained using adsorbent materials from de-inking paper sludge. This result could be due to their higher content in oxygenated surface groups, high average pore diameter, elevated superficial charge density, high CaCC>3 amount and high Ca and Mg exchange content.
Chalcopyrite, the main ore of copper, is refractory in sulfuric media with slow dissolution. The most commonly employed hydrometallurgical process for the oxidation of chalcopyrite and copper extraction is the sulfuric acid ferric sulfate system The main objective of the present work is to study the use of cheap carbon-based materials in the leaching of copper and zinc from a sulfide complex mineral from Iberian Pyrite Belt (IPB). The addition effect of commercial charcoal (VC) and two magnetic biochars (BM and HM) that were obtained by pyrolysis of biomass wastes was compared to that of commercial activated carbon (AC). The experimental results performed in this work have shown that the presence of carbon-based materials significantly influences the kinetics of chalcopyrite leaching in the sulfuric acid ferric sulfate media at 90 °C. The amount of copper and zinc extracted from IPB without the addition of carbon-based material was 63 and 72%, respectively. The highest amount of extracted zinc (>90%) was obtained with the addition of VC and AC in IPB/carbon-based material ratio of 1/0.25 w/w. Moreover, it is possible to recover more than 80% of copper with the addition of VC in a ratio 1/0.25 w/w. Moreover, an optimization of the properties of the carbon-based material for its potential application as catalyst in the leaching of metals from sulfide is necessary.
La doctrina de la Weltanschauung de R. Guardini es la propuesta gnoseológica de poner a Cristo como centro y medida del ser humano y de la entera realidad. Sólo Cristo, desde su distancia divina, posee la mirada plena sobre la existencia humana, conoce la verdadera realidad tal y como es, en su totalidad y concreción. La revelación y la fe, por la que participamos de esa mirada de Cristo, otorgan al pensamiento humano la perspectiva divina desde la que mirar al hombre en su totalidad, sin abstracciones, sin perder la conexión con la existencia real y concreta.
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