IntroductionNowadays, industrial activity in the world has developed very rapidly. In addition to generating positive impacts, the growth of the industry also generates a new problem for the environment and therefore we must look for effective and efficient ways to manage negative impacts such as waste. An example of pollution due to industrial waste is pollution caused by waste containing dissolved heavy metals. Waste with high heavy metal content could be dangerous pollutants. One of the harmful heavy metals is chromium. Chromium in waste generally has a valency of three (Cr3+) and a valency of six (Cr6+). Heavy metals such as chromium scrap from the metal plating (electroplating) industry, paint/pigment industry and leather tanning industries. Cr(VI) wastes are of concern due to their carcinogenic properties. It is interesting to note that only Cr(VI) is carcinogenic, while Cr(III) is not (Mariana et al, 2006). The toxicity level of Cr(III) is only about 1/100 times that of Cr(VI). Some methods of handling Cr(VI) waste have been carried out by chemical reduction and ion exchange (Slamet et al. 2003). Generally, the methods used for handling Cr(VI) waste require high cost and time-consuming process. There are other alternatives to remove chromium from industrial waste by an adsorption method using biomaterials. This method is a very promising method for treating industrial waste, mainly because it is inexpensive and has a high absorption capacity. Some examples of research that has been carried out using biomaterials as a bio-sorbent to absorb Cr(III) using algae (Sudiarta, 2009), the use of peanut shells as a bio-sorbent for the reactive dye of Cibacron red (Aprilia S, 2009), absorption of copper ions using chitosa...... middle of paper ...... mg/L. Figure 3 shows the relationship between temperature and Cr(VI) absorption capacity. At temperatures of 35 ºC and 50 ºC, contact time of 120 minutes and concentration of 50 mg/L, the absorption capacity was obtained up to 1.5256 and 1.6752 mg/g, respectively. Based on this data, it can be seen that the higher the applied temperature, the higher the absorption capacity. This is probably because the empty pores present in the adsorbent will enlarge. Therefore, if it is used to absorb the adsorbate at the same temperature, the absorption capacity becomes larger. Conclusions The optimal absorption process of Cr6+ metal with an adsorbent dose of 1 g and a contact time of 60 minutes was obtained at a concentration of 50 mg/L and a temperature of 50º C. The best absorption process Absorption of Cr(VI) metal ions using guava leaves was obtained with a contact time of 30 minutes..