Synthesis of walnut shell modified with titanium dioxide and zinc oxide nanoparticles for efficient removal of humic acid from aqueous solutions | Zendy

Ali Naghizadeh | Zendy; Habibeh Shahabi | Zendy; Fatemeh Faraji Ghasemi | Zendy; Ahmad Zarei | Zendy

Open Access

Synthesis of walnut shell modified with titanium dioxide and zinc oxide nanoparticles for efficient removal of humic acid from aqueous solutions

Author(s) -

Ali Naghizadeh,

Habibeh Shahabi,

Fatemeh Faraji Ghasemi,

Ahmad Zarei

Publication year - 2016

Publication title -

journal of water and health

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.482

H-Index - 59

eISSN - 1996-7829

pISSN - 1477-8920

DOI - 10.2166/wh.2016.072

Subject(s) - humic acid , adsorption , aqueous solution , zinc , chemistry , langmuir adsorption model , nuclear chemistry , titanium dioxide , shell (structure) , titanium , materials science , organic chemistry , metallurgy , fertilizer , composite material

The main aim of this research was to study the efficiency of modified walnut shell with titanium dioxide (TiO 2 ) and zinc oxide (ZnO) in the adsorption of humic acid from aqueous solutions. This experimental study was carried out in a batch condition to determine the effects of factors such as contact time, pH, humic acid concentration, dose of adsorbents (raw walnut shell, modified walnut shell with TiO 2 and ZnO) on the removal efficiency of humic acid. pH zpc of raw walnut shell, walnut shell modified with TiO 2 and walnut shell modified with ZnO were 7.6, 7.5, and 8, respectively. The maximum adsorption capacity of humic acid at concentration of 30 mg/L, contact time of 30 min at pH = 3 in an adsorbent dose of 0.02 g of walnut shell and ZnO and TiO 2 modified walnut shell were found to be 35.2, 37.9, and 40.2 mg/g, respectively. The results showed that the studied adsorbents tended to fit with the Langmuir model. Walnut shell, due to its availability, cost-effectiveness, and also its high adsorption efficiency, can be proposed as a promising natural adsorbent in the removal of humic acid from aqueous solutions.

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