title: Removal of methylene blue by lava adsorption and catalysis oxidation.
abstract: Adsorption has been found to be effective for the removal of dyes from effluent; however, the contaminant will cause secondary pollution if it is not properly treated. In this paper, the ability of lava as a low-cost adsorbent and catalyst for the removal of a commercial dye, Methylene Blue (MB), from aqueous solution has been investigated under various experimental conditions. It was found that lava had a high efficiency (more than 98%) for MB removal by adsorption. The adsorption equilibrium data can be fitted well by the Langmuir adsorption isotherm model. The adsorption kinetics was shown to be pseudo-second-order. After adsorption the contaminant could be catalysis oxidized by lava with the aids of H2O2 and ultrasound. The result showed that 95% of the MB could be decomposed in 100 min with the aid of ultrasound at 85 W/cm2. Overall, this study demonstrates lava as a promising material for wastewater treatment to remove and decompose dyes in a single treatment step.
authors.affiliation: College of Environmental and Safety Engineering, Jiangsu Polytechnic University, Changzhou, Jiangsu 213164, China. jma@zju.edu.cn
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Ma
authors.forename: Jinbao
authors.initials: J
authors.lastname: Zhang
authors.forename: Dinglong
authors.initials: D
authors.lastname: Li
mesh_terms: D000327:Adsorption; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry / Q000302:isolation & purification*; D010100:Oxygen / Q000737:chemistry*; D011312:Pressure; D017640:Silicates / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D017640:Silicates; D014874:Water Pollutants, Chemical; C060346:basalt; D006861:Hydrogen Peroxide; D010100:Oxygen; D008751:Methylene Blue