Reduction and Biosorption of Cr(VI) from Aqueous Solutions by Acid-Modified Guava Seeds: Kinetic and Equilibrium Studies

被引:3
|
作者
Ortiz-Gutierrez, Marel [1 ]
Alfaro-Cuevas-Villanueva, Ruth [2 ]
Martinez-Miranda, Veronica [3 ]
Hernandez-Cristobal, Orlando [4 ]
Cortes-Martinez, Raul [5 ]
机构
[1] Michoacan Univ St Nicholas Hidalgo, Sci Program Environm Engn, Fac Biol, Morelia 58060, Michoacan, Mexico
[2] Michoacan Univ St Nicholas Hidalgo, Earth Sci Res Inst, Edif U, Morelia 58060, Michoacan, Mexico
[3] Autonomous Univ State Mexico, Interamer Inst Water Technol & Sci, Unidad San Cayetano, Carretera Toluca Atlaconulco Km 14-5, Toluca 50200, Estado De Mexic, Mexico
[4] Univ Nacl Autonoma Mexico, Morelia Unit, Natl Sch Higher Studies ENES, Antigua Carretera Ptitzcuaro 8701, Morelia, Michoacan, Mexico
[5] Michoacan Univ St Nicholas Hidalgo, Fac Chem Pharmacobiol, Tzintumtzan 173 Col Matamoros, Morelia 58240, Michoacan, Mexico
关键词
Guava seeds; chromium reduction; biosorption; isotherms; CHROMIUM REMOVAL; WASTE-WATER; POTENTIAL USE; METAL-IONS; ADSORPTION; CR(III); BIOMASS; SAWDUST; ALGAE; ISOTHERMS;
D O I
10.2478/pjct-2020-0037
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The use of guava seeds (GS) and acid-modified guava seeds (MGS) for the removal of Cr(VI) from aqueous solutions was investigated. Batch-type experiments were performed with Cr(VI) aqueous solutions and biosorbents to determine the kinetic and equilibrium sorption parameters. Results indicated that GS and MGS were capable of reducing and remove Cr(VI) from solutions, but the reduction was only observed at some experimental conditions. Infrared analysis showed that several functional groups were involved in the reduction, and biosorption of Cr(VI), particularly alcohol, phenolic, carboxylic, and methoxymethyl structures. The mechanisms of reduction and biosorption depended upon the type of biosorbent, pH, and temperature of the system. The pseudo-second-order kinetic model describes the kinetic sorption data, and the Langmuir-Freundlich (L-F) model describes the isotherm data in most cases. Significantly high total chromium biosorption capacities were obtained. Acid modification of guava seeds improves chromium biosorption performance.
引用
收藏
页码:36 / 47
页数:12
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