A comprehensive new study on the removal of Pb (II) from aqueous solution by sirnak coal-derived char

Batur E., Baytar O., Kutluay S., Horoz S., Sahin Ö.

ENVIRONMENTAL TECHNOLOGY, cilt.42, sa.3, ss.505-520, 2021 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 42 Sayı: 3
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1080/09593330.2020.1811397
  • Dergi Adı: ENVIRONMENTAL TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, Communication Abstracts, Compendex, EMBASE, Environment Index, Geobase, Greenfile, INSPEC, MEDLINE, Metadex, Pollution Abstracts, Veterinary Science Database, DIALNET, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.505-520
  • Anahtar Kelimeler: Coal-derived char, isotherm, kinetics, mathematical modelling, Pb (II) removal, MICROWAVE-RADIATION APPLICATIONS, HEAVY-METAL ADSORPTION, ACTIVATED CARBON, METHYLENE-BLUE, COLD-PLASMA, SURFACE, OPTIMIZATION, PYROLYSIS, PRECURSOR, KINETICS
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

In this study, char was prepared from the Sirnak coal derivative as a new adsorbent by the pyrolysis process and successfully applied for Pb (II) removal. Prepared char adsorbent was characterized by analysis techniques such as thermogravimetric (TG)/differential thermogravimetric (DTG), iodine number, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) surface area. In the experimental design of the Pb (II) removal process, the relationship between operating factors (contact time, initial Pb (II) concentration and temperature) and process responses (adsorption capacity and removal efficiency) was modelled by applying response surface methodology (RSM). After that, the operating factors for the maximum adsorption capacity and removal efficiency of Pb (II) by char were optimized. In the removal of Pb (II), pseudo-first order and pseudo-second order kinetic models were used to determine the process mechanism. In addition, adsorption isotherm models such as Langmuir, Freundlich, and Dubinin-Radushkevich were applied to the equilibrium data to explain the adsorption mechanism between the adsorbent and adsorbate molecules. According to the results obtained, it was determined that kinetic and equilibrium isotherm data were better defined with pseudo-second order kinetic and Dubinin-Radushkevich isotherm models, respectively. The optimum values of the contact time, initial Pb (II) concentration, and temperature for maximum adsorption capacity (124.64 mg/g) and removal efficiency (92.35%) of Pb (II) were found as 150.00 min, 144.81 ppm, and 35.06 degrees C, respectively. This study indicated the application potential of Sirnak coal-derived char as a promising cost-effective adsorbent for the removal of heavy metals.