ArticleJournal of environmental health science & engineering2020
Modeling of chromium (VI) removal from aqueous solution using modified green-Graphene: RSM-CCD approach, optimization, isotherm, and kinetic studies.
Article in Journal of environmental health science & engineering, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
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Who cites it
12 citing papers in PubMed, 26 citations in OpenAlex.
- Photocatalytic removal of Cr(VI) using cobalt ferrite-coated recycled cigarette butts under visible light: optimization via response surface methodology.Scientific reports · 2026Article
- Environmentally sustainable renewable luffa-derived biomass graphene nanosheets for efficient Cr (VI) removal: Fabrication, characterization, and adsorption analysis.Scientific reports · 2026Article
- Article
- Photocatalytic degradation and dechlorination mechanism of diclofenac using heterojunction Mn-doped tungsten trioxide (Mn-WOScientific reports · 2024Article
- Comparative removal of hazardous cationic dyes by MOF-5 and modified graphene oxide.Scientific reports · 2022Article
- Response surface optimization and modeling in heavy metal removal from wastewater-a critical review.Environmental monitoring and assessment · 2022Review
- Effective CdJournal of environmental health science & engineering · 2021Article
- Use and treatment of chicken feathers as a natural adsorbent for the removal of copper in aqueous solution.Journal of environmental health science & engineering · 2021Article
- Synthesis and characterizations of hybrid PEG-FeJournal of environmental health science & engineering · 2021Article
- Deterministic and probabilistic human health risk assessment approach of exposure to heavy metals in drinking water sources: A case study of a semi-arid region in the west of Iran.Journal of environmental health science & engineering · 2021Article
- Optimization of electro-kinetic process for remediation of soil contaminated with phenanthrene using response surface methodology.Environmental science and pollution research international · 2021Article
- Modified wheat straw-derived graphene for the removal of Eriochrome Black T: characterization, isotherm, and kinetic studies.Environmental science and pollution research international · 2021Article
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Authors and funding
9 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe aim of this study was to investigate the removal of Cr (VI) using Green-Graphene Nanosheets (GGN) synthesized from rice straw.
methodsSynthesis of the GGN was optimized using response surface methodology and central composite design (CCD). The effect of two independent variables including KOH-to-raw rice ash (KOH/RRA) ratio and temperature on the specific surface area of the GGN was determined. To have better removal of Cr (VI), GGN was modified using the grafting amine group method. In the Cr (VI) removal process, the effects of four independent variables including initial Cr (VI) concentration, adsorbent dosage, contact time, and initial solution pH were studied.
resultsThe results of this study showed that the optimum values of the KOH/RRA ratio and temperature for the preparation of GGN were 10.85 and 749.61 °C, respectively. The maximum amount of SSA obtained at optimum conditions for GGN was 551.14 ± 3.83 m 2 /g. The optimum conditions for Cr (VI) removal were 48.35 mg/L, 1.46 g/L, 44.30 min, and 6.87 for Cr (VI) concentration, adsorbent dosage, contact time, and pH, respectively. Based on variance analysis, the adsorbent dose was the most sensitive factor for Cr (VI) removal. Langmuir isotherm (R2 = 0.991) and Pseudo-second-order kinetic models (R2 = 0.999) were the best fit for the study results and the Q max was 138.89 mg/g.
conclusionsIt can be concluded that the predicted conditions from the GGN synthesis model and the optimum conditions from the Cr (VI) removal model both agreed with the experimental findings.
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