title: Adsorptive Removal of Toxic Chromium from Waste-Water Using Wheat Straw and Eupatorium adenophorum.
abstract: Environmental pollution with heavy metals is a serious issue worldwide posing threats to humans, animals and plants and to the stability of overall ecosystem. Chromium (Cr) is one of most hazardous heavy metals with a high carcinogenic and recalcitrant nature. Aim of the present study was to select low-cost biosorbent using wheat straw and Eupatorium adenophorum through simple carbonization process, capable of removing Cr (VI) efficiently from wastewater. From studied plants a low cost adsorbent was prepared for removing Cr (VI) from aqueous solution following very simple carbonization method excluding activation process. Several factors such as pH, contact time, sorbent dosage and temperature were investigated for attaining ideal condition. For analysis of adsorption equilibrium isotherm data, Langmuir, Freundlich and Temkin models were used while pseudo-first-order, pseudo-second-order, external diffusion and intra-particle diffusion models were used for the analysis of kinetic data. The obtained results revealed that 99.9% of Cr (VI) removal was observed in the solution with a pH of 1.0. Among all the tested models Langmuir model fitted more closely according to the data obtained. Increase in adsorption capacity was observed with increasing temperature revealing endothermic nature of Cr (VI). The maximum Cr (VI) adsorption potential of E. adenophorum and wheat straw was 89.22 mg per 1 gram adsorbent at 308K. Kinetic data of absorption precisely followed pseudo-second-order model. Present study revealed highest potential of E. adenophorum and wheat straw for producing low cost adsorbent and to remove Cr (VI) from contaminated water.
authors.affiliation: Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, People's Republic of China.|University of Chinese Academy of Sciences, Beijing, People's Republic of China.
authors.forename: Dagang
authors.initials: D
authors.lastname: Song
authors.affiliation: Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, People's Republic of China.
authors.forename: Kaiwen
authors.initials: K
authors.lastname: Pan
authors.affiliation: Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, People's Republic of China.|University of Chinese Academy of Sciences, Beijing, People's Republic of China.
authors.forename: Akash
authors.initials: A
authors.lastname: Tariq
authors.affiliation: Department of Botany, Kohat University of Science and Technology, Kohat, Pakistan.
authors.forename: Azizullah
authors.initials: A
authors.lastname: Azizullah
authors.affiliation: Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, People's Republic of China.|University of Chinese Academy of Sciences, Beijing, People's Republic of China.
authors.forename: Feng
authors.initials: F
authors.lastname: Sun
authors.affiliation: Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, People's Republic of China.|University of Chinese Academy of Sciences, Beijing, People's Republic of China.
authors.forename: Zilong
authors.initials: Z
authors.lastname: Li
authors.affiliation: Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, People's Republic of China.|University of Chinese Academy of Sciences, Beijing, People's Republic of China.
authors.forename: Qinli
authors.initials: Q
authors.lastname: Xiong
mesh_terms: D036603:Ageratina / Q000254:growth & development*; D017608:Chromium Compounds / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008954:Models, Biological; D014908:Triticum; D062065:Wastewater / Q000382:microbiology*; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods
chemical_list: D017608:Chromium Compounds; D062065:Wastewater; D014874:Water Pollutants, Chemical