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Preparation of light weight constructional materials from chrome containing buffing dust solid waste generated in leather industry

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Abstract

An alternative and environmentally benign method of disposing the buffing dust, generated from leather industry was carried out in the present investigation. The buffing dust (finished solid waste) was charred in a controlled oxygen atmosphere by coupled pyrolysis and the resultant material was gauged for the application of light weight cement blocks. The results confirmed that, at a flow rate of 1 LPM oxygen supplied for 30 min produced nanostructured fibrous carbon material which was further confirmed through SEM and EDX analyses. Iron nanoparticles were used to inhibit the conversion of trivalent chromium to hexavalent chromium in fibrous carbon before being utilized for making light weight cement block. The addition of iron nanoparticles supplements the mechanical strength by compositional bonding in cement block. The XRD results elucidate that the hexavalent chromium has reduced to trivalent chromium due to the addition of iron nanoparticles in the residue material. The as-prepared light weight cement blocks were fabricated (7 cm × 7 cm × 7 cm) for compression test, simultaneously cement block devoid of iron nanoparticles was prepared as a control. The compressive strength of the light weight cement block comprising of iron nanoparticles (20.7 kN/cm2) was found to be higher than the block without iron nanoparticles (3.82 kN/cm2).

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Abbreviations

cBD:

Charred buffing dust

LPM:

Litre per minute

BDL:

Below desirable limit

SEM:

Scanning electron microscopy

EDX:

Energy dispersive X-ray

XRD:

X-ray diffraction

EVM:

Expert group on vitamins and minerals

MET:

Minimum eliciting threshold

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Acknowledgments

We thank CSIR, India for providing financial assistance through net work project SUSTRANS (ESC 0106) to carry out the work.

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Authors and Affiliations

  1. Department of Chemical Engineering, A.C. College of Technology, Anna University, Chennai, 600 025, India

    K. Sivaprakash

  2. Environmental Technology Division, Council of Scientific and Industrial Research (CSIR), Central Leather Research Institute (CLRI), Adyar, Chennai, 600 020, TamilNadu, India

    P. Maharaja, S. Pavithra & G. Sekaran

  3. Environment & Sustainability Department, Council of Scientific and Industrial Research-Institute of Minerals and Materials Technology (CSIR-IMMT), Bhubaneswar, 751013, Odisha, India

    R. Boopathy

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  1. K. Sivaprakash
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Correspondence to G. Sekaran.

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Sivaprakash, K., Maharaja, P., Pavithra, S. et al. Preparation of light weight constructional materials from chrome containing buffing dust solid waste generated in leather industry. J Mater Cycles Waste Manag 19, 928–938 (2017). https://doi.org/10.1007/s10163-016-0494-z

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  • DOI: https://doi.org/10.1007/s10163-016-0494-z

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