Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 25, Issue 32, Pages 32210-32220Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-3148-y
Keywords
AC characterization; Adsorption; Adsorption kinetics; Adsorption isotherms; Sodium diclofenac; Tea waste derived AC
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Funding
- Department of Material Sciences and Metallurgical Engineering (MEMS) of Indian Institute of Technology (IIT) Bombay, Mumbai, India
- Sophisticated Analytical Instrument Facility (SAIF), Department of Chemistry, Indian Institute of Technology (IIT) Bombay
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The present experimental study reports the performance of tea waste (TW) derived adsorbent for the adsorption of sodium diclofenac (SD) from aqueous solution (SD concentration=10-50mg/L). The waste-derived activated carbon was prepared by chemical activation process of raw waste using H2SO4, KOH, ZnCl2, and K2CO3 as activating agents (TW: activating agent=1:1 by weight). Subsequently, the oven-dried material was carbonized at 600-degrees C temperature for 2h. The synthesized adsorbents were porous and their Brunauer-Emmett-Teller (BET) surface area was ranged 115-865m(2)/g. Among all synthesized adsorbents, the adsorbent activated by ZnCl2 exhibited the highest adsorption capacity (=62mg/g), though it was much lower compared to 91mg/g obtained with commercial activated carbon (CAC) (SD concentration=30mg/L, adsorbent dose=300mg/L and initial wastewater pH=6.47). SD equilibrium data could be described by Langmuir isotherm adequately, while pseudo-second-order rate model showed better fit to the time based adsorption data. Low activation energy of the adsorption process suggests the reaction to be temperature independent. Thermodynamic parameters showed the spontaneous and endothermic nature of adsorption process conducted in the presence of waste derived adsorbent.
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