title: Low-cost and effective phenol and basic dyes trapper derived from the porous silica coated with hydrotalcite gel.
abstract: Novel low-cost and effective adsorbents of phenol and basic dyes were made by coating amorphous silica with hydrotalcite (HT) gel followed by soaking in alkaline solution, and the surface basic-acidic properties of resulting composites were evaluated by CO(2)-TPD, Hammett indicator method and NH(3)-TPD, respectively. Both BET surface area and microporous surface area of the composites were increased after they were soaked with alkaline solution; meanwhile the center of pore size distribution was changed from 9 to 3-4 nm. These composites efficiently captured phenol in gaseous and liquid phases, superior to mesoporous silica such as MCM-48 or SBA-15 and zeolite NaY, and the equilibrium data of gaseous adsorption could be well fitted to Freundlich model. These modified silicas also exhibited high adsorption capacity forward basic dyes such as crystal violet (CV) and leuco-crystal violet (LCV), reaching the adsorption equilibrium within 1 h and offering a new material for environment protection.
authors: Key Laboratory of Mesoscopic Chemistry of MOE, College of Chemistry and Chemistry Engineering, Nanjing University, Nanjing 210093, China.
authors: Yu Fei
authors: YF
authors: Tao
authors: Wei Gang
authors: WG
authors: Lin
authors: Ling
authors: L
authors: Gao
authors: Jin
authors: J
authors: Yang
authors: Yu
authors: Y
authors: Zhou
authors: Jia Yuan
authors: JY
authors: Yang
authors: Feng
authors: F
authors: Wei
authors: Ying
authors: Y
authors: Wang
authors: Jian Hua
authors: JH
authors: Zhu
mesh_terms: D000327:Adsorption; D000536:Aluminum Hydroxide / Q000737:chemistry*; D004396:Coloring Agents / Q000302:isolation & purification*; D004785:Environmental Pollutants / Q000302:isolation & purification; D052918:Environmental Restoration and Remediation / Q000191:economics / Q000379:methods*; D005782:Gels; D008276:Magnesium Hydroxide / Q000737:chemistry*; D010636:Phenols; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D004785:Environmental Pollutants; D005782:Gels; D010636:Phenols; C010467:hydrotalcite; D000536:Aluminum Hydroxide; D012822:Silicon Dioxide; D008276:Magnesium Hydroxide