Decolorization of Remazol Black B Solution by PbO2 Modified Fenton Method in a Scaled Up Reactor

Abstract

Study on decolourization of remazol black B (RBB) solution has been performed in a scale up reactor. As an artificial waste, the dye sample that contains azo groups is difficult to decompose under ordinary environmental conditions so it requires further treatment before discharging to open aquatic system. Many efforts have been reported and further developed toward other azo dyes. One of an outstanding approach is Fenton method. This study modified the method with PbO2 rather than Fe2+. In this modification, the dyestuff was degraded by radical •OH resulting from reaction between H2O2 and Pb2+ ion generated from PbO2. In Preliminary works, decolourization was performed and optimized in lab-scaled. Analysis were conducted and the best condition was applied to decolorize the sample in a scale-up size. Characteristics of the reactor was also determined. Results showed that at optimum condition, 100 mL of 50 ppm remazol black B was decolorized up to 98.82 % within 15 minutes. On scale up to 1 L-sized reactor, within the time highest percentages of remazol black B decolourization was reached 82.02 % by addition of 10 % H2O2 and COD decrease to 98.96 %. In the 1 L reactor, RBB sample with concentration of 50 ppm, PbO2 1 gram and H2O2 10 % obey the proposed decolourization equation of D = -0,0011x2 + 0.5705x – 0.6788 with x = volume peroxide (in mL), D = percent of decolourization.

Synthesis of Lead Oxide Using the Oxidizing Agent (NH4)2S2O8 with Variaous Amounts of NaOH for Decolorization of Remazol Black B Solution

“…The reaction that takes place is a spontaneous reaction based on a positive theoretical cell potential. Based on reactions (6)(7)(8), the reaction between PbO2 and H2O2 can produce Pb 2+ ions on the surface so that Pb 2+ will interact with H2O2 to produce hydroxyl radicals (⦁OH) which can degrade remazol black B compounds and produce new radicals so that the reaction can occur sequentially and rapidly. The PbO2 surface is a place that can facilitate the formation of hydroxyl radicals (⦁OH) because Pb 2+ is available on the surface.…”

“…Based on research conducted by Hasibuan et al [8], using Pb oxide in the reaction using H2O2 can initiate the formation of hydroxyl radicals. The hydroxyl radical (⦁OH) has a high standard reduction potential value of 2.8 V. The formation scheme that occurs is shown in reactions ( 9) to (13).…”

“…•R + H + + e -→ CO2 + H2O + minerals (11) where R is the RBB substance molecule [8] Pb 4+ + 2H2O2 → Pb 2+ +2HO2•+2H + ( 12)…”

“…In conditions that are not ideal, the radicals formed in reactions ( 12) and (13) will react again with hydrogen peroxide, Pb 2+ , and Pb 4+ contained in the Fenton modification method. The reactions that occur are shown in ( 17) to (20) [8].…”

Review Modeling of Solid Waste Transportation Routes Using Geographical Information System (GIS)

“…This algorithm adopts the biological mechanism proposed by Charles Darwin with his famous and controversial evolutionary theory. Some examples of the application of genetic algorithms are in the industrial field for determining machine layout [17]. Furthermore, genetic algorithms can be applied to the field of animal husbandry for determining the composition of animal feed, and in the field of civil engineering can be applied to design pipeline distribution lines.…”