Abstract
This study was conducted to evaluate the usability of lanthanum hydroxide for arsenic removal from water. Batch adsorption experiments were performed to study the influence of various factors such as pH, contact time, initial arsenic concentration and presence of competing anions on arsenic adsorption by lanthanum hydroxide. Lanthanum hydroxide had a higher affinity for As(V) than As(III). Efficient As(V) removal was observed in the pH<sub>eq</sub> 4.0~8.0. The pseudo-second-order kinetic model and the Langmuir isotherm model described well the experimental data. The maximum monolayer adsorption capacity was found to be 125.0 mg/g. The adsorption energies of 16.00~16.28 kJ/mol indicate an ion exchange process as primary adsorption mechanism. The presence of competing anions, except for phosphate, did not significantly affect As(V) removal by lanthanum hydroxide. The As(V) adsorbed on lanthanum hydroxide could be desorbed with NaOH solution. The results of this study demonstrate the potential usability of lanthanum hydroxide as an excellent As(V) selective adsorbent.
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