Decolourization of Reactive Red 120 Using Agro Waste-Derived Biochar

Abstract

Adsorption behavior of Reactive Red 120 from aqueous solutions onto rice husk-derived biochar was examined in batch mode of operation. To obtain the optimized conditions, various adsorption variables including temperature, initial dye concentration, biochar dosage, pH, and contact time were studied for effective remediation of the dye. The results showed that biochar uptake capacity varied linearly with biochar dosage and pH, but varied nonlinearly with temperature. The optimum value of pH, temperature, and a dosage of biochar was obtained as 2.0, 35°C, and 1 g/L, respectively, for reactive red 120 adsorption. TG analysis, FTIR, and SEM were used to investigate biochar characterization, and the results revealed that dye sorption onto biochar caused biochar variation. The possibility of reusing the biochar was examined from desorption studies, and they are conducted by studying different elutants and by altering the ratio of solid to liquid. From the results of experiments, the rice husk-derived biochar was reported to remediate reactive red 120 with the maximum removal efficiency of 75%.

Green and Facile Synthesis of Porous SiO2@C Adsorbents from Rice Husk: Preparation, Characterization, and Their Application in Removal of Reactive Red 120 in Aqueous Solution

“…Similarly, the peak at 1636.05 cm –1 for the C=C asymmetric stretch decreased softly to 1566.94 cm –1 when RR120 was absorbed on the RH8-3 surface. However, there were new peaks at 1384.62 cm –1 , corresponding to the SO 3 stretch groups, 68 , 69 which were absent in the spectra of the native RH8-3. Moreover, the peaks observed at 1080 and 1083 cm –1 attributed to the Si–O–Si stretch and 658.91 and 663.68 cm –1 attributed to Si–H can be seen in both RH8-3 and RH8-3 after RR120 adsorption.…”

Agrowaste-generated biochar for the sustainable remediation of refractory pollutants

“… Krishnasamy et al (2022) developed agricultural waste-derived biochar from rice husks (the raw material) for the remediation of Reactive Red 120 (RR120) from an aqueous solution. The raw material was washed and dried for 24 h and was then pulverized into a fine powder containing 75-mm particles.…”