An Environmentally Benign Approach for As (V) Absorption from Wastewater Using Untreated Coffee Grounds—Preliminary Results

Gnu Nam, Min-Suk Kim, Namju Lee, Young-Hoon Choi, Ji Ahn
2017 Water  
Arsenic contamination of water is a worldwide issue due to its severe effects on the human body. Coffee grounds are a porous material with network structures, making it absorb other substances such as some gases or elements. In this research, renewable coffee wastes were used as an adsorbent to extract arsenic (As) from wastewater. In order to evaluate the usefulness of untreated coffee grounds, a series of preliminary tests for attachment of arsenic to coffee grounds were provided. The
more » ... ovided. The Brunauer-Emmett-Teller (BET) surface area and adsorption-desorption isotherms of an untreated coffee ground obtained from N 2 gas adsorption were provided, and pore sizes was obtained using Barrett-Joyner-Halenda (BJH) method. The adsorption capacities of the coffee waste were verified through a series of experimental processes changing the conditions such as concentration of arsenic, initial amount of coffee grounds, and pH. The maximum absorption concentration of 6.44 mg/L on 1 g of coffee grounds at 1.00 mM of arsenic solution was observed. It was demonstrated that the modification by the cation species or pretreatment processes, such as calcination, will be necessary to enhance the absorption capacity for the extraction of arsenic.
doi:10.3390/w9110867 fatcat:r7m2d6pdifdihfbqdo3uwozcse