Adsorptive removal of Cr(VI) from water using silver nanoparticle modified-diatomite nanocomposite
Gonfa G. Kidanu A. Akram S. Lal B. Kezembayeva G. Bokov D.O. Asghari A. Yadav K.K. Saravanan A. Hosseini-Bandegharaei A.
December 2025Nature Research
Scientific Reports
2025#15Issue 1
Keeping the sustainability concept in view, the present study aimed to valorize diatomite for adsorptive removal of Cr(VI) ions from waters and wastewaters. A modified diatomite nanocomposite was prepared via its impregnation with silver nanoparticles, using a one-pot technique, and the silver nanoparticles-diatomite nanocomposite potency was comprehensively investigated for Cr(VI) adsorption. The raw diatomite and silver nanoparticles-diatomite nanocomposite were characterized via XRD, SEM, and BET techniques. A statistical technique, based on response surface method, was exploited for finding the optimized conditions for adsorption. Accordingly, a maximal chromium sorption of 94.0% was observed at pH 4.61, sorption duration 60.37 min, and adsorbent dosage 2 g, for an initial level of 45 mg/L for the composite adsorbent. The equilibrium scrutinization shows that Langmuir isotherm model has a better fitness with the adsorption data. In addition, the adsorption kinetic analyses demonstrated the best fit to the pseudo-second order equation and multiple distinct phases of intraparticle diffusion for both adsorbents. Overall, silver nanoparticles-diatomite nanocomposite showed excellent properties for adsorption of Cr(VI) ions and could be exploited as an adsorbent in full-scale treatment plants.
Adsorption , Diatomaceous earth , Hexavalent chromium , Nanomaterials , Wastewater treatment
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Department of Chemical Engineering, Addis Ababa Science and Technology University, 16417, Addis Ababa, Ethiopia
Biotechnology and Bioprocess Center of Excellence, Addis Ababa Science and Technology University, 16417, Addis Ababa, Ethiopia
Nanotechnology Center of Excellence, Addis Ababa Science and Technology University, 16417, Addis Ababa, Ethiopia
Division of Science and Technology, University of Education Lahore, Lahore, Pakistan
Department of Chemistry, Institute of Applied Science and Humanities, GLA University, Mathura, 281406, India
Department Chemical Processes and Industrial Ecology, Mining and Metallurgical Institute named after O.A. Baikonurov, Satbayev University, Almaty, Kazakhstan
Institute of Pharmacy Named After A.P. Nelyubin, Sechenov First Moscow State Medical University, 8 Trubetskaya St., bldg. 2, Moscow, 119991, Russian Federation
Laboratory of Food Chemistry, Federal Research Center of Nutrition, Biotechnology and Food Safety, 2/14 Ustyinsky pr, Moscow, 109240, Russian Federation
Faculty of Chemistry, Semnan University, Semnan, Iran
Department of Environmental Science, Parul Institute of Applied Sciences, Parul University, Gujarat, Vadodara, 391760, India
Environmental and Atmospheric Sciences Research Group, Scientific Research Center, Al-Ayen University, Nasiriyah, Thi-Qar, Iraq
Department of Biotechnology, Saveetha School of Engineering, SIMATS, Tamil Nadu, Chennai, 602105, India
Department of Chemical Engineering
Biotechnology and Bioprocess Center of Excellence
Nanotechnology Center of Excellence
Division of Science and Technology
Department of Chemistry
Department Chemical Processes and Industrial Ecology
Institute of Pharmacy Named After A.P. Nelyubin
Laboratory of Food Chemistry
Faculty of Chemistry
Department of Environmental Science
Environmental and Atmospheric Sciences Research Group
Department of Biotechnology
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