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Utilization of Industrial Wastes as Catalyst or Catalyst Support for Photocatalytic Treatment of Synthetic and Simulated Pulp Bleaching Wastewaters
Journal
Industrial and Engineering Chemistry Research
ISSN
08885885
Date Issued
2022-03-16
Author(s)
Singh, Swati
Garg, Anurag
Abstract
In the present study, the performance of industrial wastes as a catalyst and/or catalyst support was investigated for the photocatalytic treatment of synthetic and simulated pulp bleaching wastewaters. The treated effluent treatment plant sludge from a steel industry was used as a catalyst (SS_HCl) alone or in conjunction with TiO2 or ZnO. Moreover, the black liquor (BL) from a pulp and paper mill was utilized for deriving catalyst supports, that is, carbonized material (C_BL) and activated carbon (AC_BL). TiO2/SS_HCl/AC_BL and SS_HCl/C_BL catalysts showed favorable catalytic properties (surface area = 377 and 268 m2 g-1, respectively). During photocatalytic oxidation, total organic carbon (TOC) removal of 65-67% could be achieved from synthetic wastewater samples (initial TOC = 110 mg L-1). The presence of radicals during the photocatalytic process was also confirmed. The chlorophenols' oxidation kinetic data could be fit adequately in the Langmuir-Hinshelwood model. Apart from this, reusability potential of the catalysts was also investigated.
Volume
61