A novel composite retanning system based on pH-responsive hydrogen bonding and hydrophobic interaction for cleaner leather processing

Zhou, Rong; Jin, Yong; Lai, Shuangquan; Shi, Liangjie; Bai, Long; Peng, Zhangyi

doi:10.1016/j.jclepro.2022.130666

Cited by 8 publications

(3 citation statements)

References 46 publications

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“…Discharge of tannery wastewater without any chemical treatments or with partial treatment to the surrounding environment causes severe contamination in air, soil, surface and groundwater bodies in the respective areas which pose health risks to workers and other people in communities [4][5][6][7]. Chrome tanning causes serious environmental pollution as the process consumes as well as releases large quantities of inorganic chemicals in raw leather processing [8]. Uncontrol dumping of tannery wastes causes the distribution of toxic chromium (VI) species in the surrounding environment which severely contaminates soil, waterbodies and other components in terrestrial environments [9].…”

Section: Introductionmentioning

confidence: 99%

A New Synthesis Method and Characterization of Graphene Oxide Nanocomposites for the Leather Tanning Process

Chakma,

Biswas,

Abdulla-Al-Mamun

et al. 2024

Text Leather Rev

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Environmental pollution caused by wastes generated from chrome tan is a major concern nowadays. This study aimed to develop an eco-friendly alternative tanning agent using graphene oxide (GO) based nanocomposite materials. GO was synthesized by a new approach with modification of the Hummers method. Two types of GO-based nanocomposites, GO-TiO2 (GT) and GO-TiO2-PEG (GTP) were prepared by adding TiO2 nanoparticles and polyethylene glycol (PEG) as surface modifiers. They were successfully applied to leather tanning processes at different concentrations (2%, 4%, and 6%). Both synthesized GO, GO-nanocomposites, and the resulting tanned leathers were characterized by Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA), and Fourier-transform Infrared Spectroscopy (FT-IR). Different physico-mechanical properties of leathers tanned with nanocomposites were evaluated and the results were compared with chrome-tanned leathers. The tensile strength of chrome-tanned leather was 223 (kg/cm) whereas the maximum tensile strength was found at 228 (kg/cm) and 233 (kg/cm) in 6% GO-TiO2 and GO-TiO2-PEG tanned leathers respectively. The environmental pollution impact of the effluents generated by the new tanning process was assessed. The COD of effluents generated from chrome tanning was 4800 ppm which was significantly reduced to 2400-1440 ppm and 2880-1920 ppm when GO-TiO2 (GT) and GO-TiO2-PEG (GTP) were applied in leather tanning respectively. The TDS and BOD were found at 183.8 and 200 ppm in conventional chrome-tanned wastewater which were significantly reduced to the range of 47.5-18.3 and 100-50 ppm respectively in liquid wastes obtained from the GO-composite tanning process. The maximum reduction of COD, BOD, TDS, and TSS in leather waste liquid was found with the application of 2% GO-nanocomposites in tanning. The results revealed that leathers tanned with nanocomposites possess characteristic properties which were very similar to those observed in chrome-tanned leathers whereas the new tanning agents drastically reduced the intensity of pollutants in leather effluents. The application of new nanocomposites in the leather tanning process is an innovative effort. This new nanocomposite-tanning method showed minimal consequences regarding environmental pollution with the generation of less toxic effluents from the respective tanning process.

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Section: Introductionmentioning

confidence: 99%

A New Synthesis Method and Characterization of Graphene Oxide Nanocomposites for the Leather Tanning Process

Chakma,

Biswas,

Abdulla-Al-Mamun

et al. 2024

Text Leather Rev

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“…The tannage process is the most commonly used technique in the leather industry (Liu et al 2022). Chrome tanning is highly associated with severe environmental pollution (Zhou et al 2022). Additionally, the harmful chemicals that are commonly used in the tanning process and contributed to tannery wastewater toxicity are surface-active compounds, grease, azo dyes, sulphonated oils, pthalates, organic chemicals (tannins), and phenolic compounds (Yadav et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Magnetite-impregnated biochar of parthenium hysterophorus for adsorption of Cr(VI) from tannery industrial wastewater

2023

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The tannery industry inevitably generates toxic and catastrophic wastewater, which results in a huge threat to public health and water resources. Therefore, this work aimed to synthesize parthenium hysterophorus-based biochar–Fe3O4 composite for removal of Cr(VI) from tannery wastewater under 34 full factorial experimental designs of the Box–Behnken, which was analyzed using response surface methodology under four independent factors of pH (3, 6, and 9), initial Cr(VI) concentrations (40, 70, and 100 mg/L), contact times (30, 60, and 90 min), and adsorbent doses (20, 60, and 100 mg/100 mL). This composite adsorbent was described by a high BET surface area of 237.4 m2/g, XRD prominent peaks, SEM morphology corroborate and FTIR multifunctionalities of O–H at 3296 cm−1, the vibration of ketone C–OH at 1240 cm−1, and the vibration of C–O–C at 1147 cm−1 and Fe–O stretching at 542 cm−1. The maximum Cr(IV) removal efficiency of 91.8% was recorded at an initial Cr(VI) concentration of 40 mg/L, pH of 3, adsorbent dose of 100 mg/100 mL, and a contact time of 90 min, whereas the minimum Cr(VI) removal of 17.3% was observed at an initial Cr(VI) concentration of 100 mg/L, 20 mg/100 mL of adsorbent dose, pH of 9, and contact time of 30 min. The concentration of Cr(VI) in real wastewater was determined to be 85.13 mg/L and its remediation was found to be 81.8%. Langmuir’s model was the best fit with experimental data at R2 0.99 and qmax 400 mg/g, showing that the adsorption process was homogenous and monolayer. In conclusion, the adsorption results were encouraging, and biochar–Fe3O4 appears to be a potential candidate for Cr removal from wastewater.

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“…Cr is the primary chemical used in the chrome process method and many unit operations used in the industry [ 9 , 10 ]. Severe environmental pollution of chrome is highly associated with the discharge of the Cr saturated industrial wastewater including the electroplating wastewater [ 11 ]. In addition to Cr, other harmful chemicals such as phthalates, grease, organic chemicals (tannins), sulfonated oils, azo dyes, surface-active compounds, and phenolic compounds have been commonly used in many industrial processes [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of chromium from electroplating wastewater using activated carbon developed from water hyacinth

Worku,

Tibebu,

Nure

et al. 2023

BMC Chemistry

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Industrial wastewater polluted with high concentrations of Cr is commonly discharged into water resources without proper treatment. This gives rise to the deterioration of water quality and imposes adverse effects on public health. Therefore, this study is aimed at removing Cr from electroplating wastewater using activated carbon produced from water hyacinth under a full factorial experimental design with three factors and three levels (pH,2,5 and 8, adsorbent dose 0.5,1and1.5 in 100 mL and contact time 30, 60 and120 min). A phosphoric acid solution of 37% was used to activate the carbon, which was then subjected to thermal decomposition for 15 min at 500 °C. The activated carbon was characterized by the presence of a high surface area (203.83 m2/g) of BET, cracking of adsorbent beads of SEM morphology, amorphous nature of XRD, and many functional groups of FTIR such as hydroxyl (3283 cm−1), alkane (2920 cm−1), nitrile (2114 cm−1) and aromatics (1613 cm−1). The minimum Cr adsorption performance of 15.6% was obtained whereas maximum removal of 90.4% was recorded at the experimental condition of pH 2, adsorbent dose of 1.5 g/100 mL, and contact time of 120 min at a fixed value of initial Cr concentration of 100 mg/L. Similarly, the maximum Cr removal from real electroplating wastewater was 81.2% at this optimum point. Langmuir's model best described the experimental value at R2 0.96 which implies the adsorption is chemically bonded, homogeneous, and monolayer. Pseudo-second-order model best fits with the experimental data with R2 value of 0.99. The adsorbent was regenerated for seven cycles and the removal efficiency decreased from 93.25% to 21.35%. Finally, this technology is promising to be scaled up to an industrial level.

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A novel composite retanning system based on pH-responsive hydrogen bonding and hydrophobic interaction for cleaner leather processing

Cited by 8 publications

References 46 publications

A New Synthesis Method and Characterization of Graphene Oxide Nanocomposites for the Leather Tanning Process

A New Synthesis Method and Characterization of Graphene Oxide Nanocomposites for the Leather Tanning Process

Magnetite-impregnated biochar of parthenium hysterophorus for adsorption of Cr(VI) from tannery industrial wastewater

Adsorption of chromium from electroplating wastewater using activated carbon developed from water hyacinth

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