Cadmium Removal from Acqueous Solution by Adsorption on Spent Coffee Grounds

• DOI: 10.3303/cet1760027
• Publication Date: 2017-09-01
• Authors: María Silvina Pat...; Irene Bavasso; Jorge Enrique Sam...; Franco Medici
• Keywords: International agency

Cadmium is a highly toxic element and can cause serious damages to the health of human beings. It on seventh position Agency for Toxic Substances Disease Registry (ATSDR, 2015) list dangerous elements. The Environmental Protection (EPA) International Research Cancer (IARC) have also recognized cadmium as carcinogen. For all these reasons, in recent years stringent limits been set this both industrial drinking water. In paper potential spent coffee grounds (SCG) removal from contaminated water was investigated. Batch experiments were performed at different temperatures, i.e. 10, 25 40°C untreated SCG. size range SCG particles studied ≤ 500 µm. results obtained showed that equilibrium reached after 3 hours. Langmuir isotherm provided best correlation adsorption process, with maximum capacity 4.48 mg g–1at 10°C. Thermodynamic analysis confirmed exothermicity spontaneity phenomenon. Kinetic studies revealed onto followed pseudo-second order kinetic model activation energy value calculated 14.5 kJ mol-1, which evidenced physical nature process. Overall, study strongly supports use an effective economical adsorbent