The removal of Cr(IV) in aqueous solution by Guava Leaf (Psidium Guajava) as a bio-sorbent was experimentally investigated. The experiment was carried out in a batch stirred reactor at room temperature. The effects of certain parameters, such as concentration of bio-sorbent and contact time, were investigated. The removal increased with contact time and concentration of bio-sorbent. The results showed that the contact time is directly proportional to the sorption capacity and the sorption efficiency. The sorption efficiency of Cr (VI) was highest at 5 grams bio-sorbent, while the sorption capacity of Cr (VI) was highest in bio-sorbent 1 gram under current experimental condition. The optimum removal of Cr (VI) using guava leaves occurred while stirring 30 minutes.

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Effect of Process Variables on Cr (IV) Removal from Liquid Waste Using Guava Leaf (Psidium guava)

Preliminary research on Cr(IV) removal in a liquid waste using guava leaves (Psidium Guajava) as a bio-sorbent has been done. The experiments were conducted in a stirred batch reactor. The effect of temperature on efficiency and absorption capacity has been studied. Both the efficiency and absorption capacity are directly proportional to the temperature under the current experimental conditions. The results showed that optimum absorption capacity and absorption efficiency of Cr(VI) use of guava leaves obtained at stirring time 30 minutes.

/pdf/the-effect-of-temperature-on-cr-vi-removal-by-using-guava-1rq0rqux6h.pdf

The Effect of Temperature on Cr (VI) Removal by Using Guava Leaves as a Biosorbent

The reduction of toxic metal, especially Cr6+, could be done by ion exchange resin The substitution of Cr6+ ion with other non-toxic ion contained in the resin will reduce the amount of toxic chromium to the permitted level In this study ion exchange was done using Dowex SBR-P (Styrene-DVB) anion resin
 Experiments were done using potassium dichromate (K2Cr2O7) as source of Cr6+ ion This compound was diluted in water inside a beaker glass Then a desired amount of resin were added and stirred at until a desired time reached The result was analyzed by spectrophotometric method using 1-5 diphenylcarbazide (DPC) as an indicator Results shows the highest adsorption was 4064%, reached at stirring speed of 190 rpm, for 60 minutes and resin weight 25 gram with the amount of potassium dichromate 33 gram
Keywords: chromium metal, ion exchange resin

Saputro Anggoro Ady

Papers

Kajian penyerapan logam khrom dari limbah industri elektroplating menggunakan resin dowex sbr-p