Use of Guava Leaves as a Bio Absorbent for Waste Elimination

1236 Words5 Pages
Introduction The wide use of heavy metals and its compounds by modern industries has resulted in large quantities of this element being discharged into environment. These inorganic micro-pollutants are of considerable concern because they are non-biodegradable, highly toxic and have a probable carcinogenic effect. If directly discharged into the sewage system, their presence decreases the efficiency of the biological treatment [1, 2, 3]. Among the heavy metals, chromium is one of the most important environmental issues. Most of the chromium is discharged into aqueous waste as a Cr(VI) and Cr(III). A wide range of technologies are available for the removal of Cr(IV) and Cr(III) from wastewater. Cr (VI) in liquid waste more danger than Cr (III). Removal of Cr (VI) is more difficult compared to Cr (III). Removal of Cr (VI) from liquid waste has been conducted by various researchers for example adsorption process using chemicals as adsorbent. The use of chemicals as adsorbent is not friendly to the environment. Therefore, it needs to look for another alternative adsorbent environmentally friendly. The use of bio-sorbent to absorb heavy metals such as Cr (VI) is very promising because it is friendly to the environment. A number of research have been used bio-sorbent for treatment of Cr(VI)-containing wastewater. Sudiarta [4] using seaweed to absorb Cr (III), Aprilia Susanti [5] utilizing peanut skins as bio-sorbent to absorb reactive dyes Cibacron Red and Ajeng et al [6] using chitosan from crab shells to absorb copper ions. Sutrasno et al. [7] have conducted research using guava bark to absorb metal ions Cr (VI). The results obtained showed that the efficiency of absorption of Cr (VI) is more than 90% at pH 2. This research uses of ... ... middle of paper ... ...of Pseudo-Second-Order for Cr (VI) Removal on bio-sorbent dose of 1 gram Based on Figures 3 and 4, it can be concluded that the absorption process of Cr(VI) using guava leaves follow the pseudo second order with k value of 14.5825 g/mg.menit and qe value of 0.1291 mg/g and R2 by 0.9967, so obtain the equation: (5) Conclusions From the present study, it can be concluded that the contact time is directly proportional to the sorption efficiency and sorption capacity. The results showed that the sorption capacity and sorption efficiency higher at acidic (pH = 4) and alkaline conditions (pH = 8). The calculation results show that the sorption kinetics of the reaction followed pseudo second order. The sorption efficiency and capacity using guava leaves reached optimum at contact time of 30 minutes under the current experimental condition.

More about Use of Guava Leaves as a Bio Absorbent for Waste Elimination

Open Document