Corncob‐to‐xylose residue (CCXR) derived porous biochar as an excellent adsorbent to remove organic dyes from wastewater

Abstract

Biochar was prepared from corncob-to-xylose residue (CCXR) by KOH activation and anaerobic pyrolysis method. The effect of activation temperature on the microstructure of the biochar was studied. Results showed that the biochar prepared at 850°C (850NBC) possessed high specific surface area and exhibited excellent adsorption property. The maximum adsorption capacity of 2249 mg g −1 was obtained when 850NBC was used for treating methylene blue (MB) solution. Adsorption isotherm fittings revealed that Langmuir and Freundlich models were applicable to 850NBC adsorption process, and the adsorption process was limited by adsorption site and the biochar surface functional groups. Furthermore, 850NBC showed good adsorption property when it was used to treat the other organic dyes of Congo red (751 mg g −1 ), Orange II (735 mg g −1 ), Indigo carmine (662 mg g −1 ) and Methyl Orange (465 mg g −1 ). Biochar 850NBC also possessed an acceptable recyclability which maintained 68.7% absorption capacity after 6 cycles when it was used to treat MB solution. These results proposed that 850NBC is expected to be a promising potential adsorbent for treating organic dyes waste water.

Vermicompost for Indigo Blue and Congo Red Removal

“…The comparison between the MAC values obtained in this work with the values shown in Table2reveals that the adsorption of CR and IB by natural adsorbents is many varied[4] [6] [17] [24] [25] [29]-[35]. For CR, values vary between 0.52 mg•g −1[25] and 751 mg•g −1[29]. While for IB all values, except one[4], have MAC around 50 mg•g −1[17] [24][30].…”

“…Adsorption isotherm linearization for IB in the presence of vermicompost. Sodium carboxymethyl cellulose and chitosan Indigo Blue 50.00 [17] Zizyphusjoazeiro peel Indigo Blue 50.00 [24] Wood sawdust powder Congo Red 0.52 [25] Corncob-to-xylose residue (CCXR) Congo Red 751.00 [29] Natural clay Indigo Blue 57.00 [30] Activated carbon Indigo Blue 53.00 [30] Algerian kaolin Congo Red 6.53 [31] Natural zeolites modified with N,N-dimethyl dehydroabietylamine oxide Congo Red 69.94 [32] Coconut residual fiber Congo Red 128.94 [33] Red mud Congo Red 4.05 [34] Polysaccharide of Carica papaya seeds Congo Red 319.08 [35] The dimensionless constant (R L ) is another thermodynamic parameter to favoring the adsorption process. In this case, 0 < R L ≤ 1 indicates favorable adsorptions, while R L > 1 can be attributed to unfavorable adsorptions (Esmaeili and Beni 2015).…”

Biochar enhanced the nitrogen removal performance of heterotrophic nitrification-aerobic denitrification strain pseudomonas fluorescent sp. Z03 for insufficient carbon source wastewater under low temperature

“…S2), which may be due to the fact that BC400 contains more oxygenated acidic functional groups (Y. Yu et al, 2019). The pH pzc of both BC400 and BC700 were lower than 4.5, indicating that the biochar was negatively charged in the experimental pH range (5.5-9.5) and could produce electrostatic adsorption of cations.…”

“…(Liu and Wang, 2019; C. Q. Yu et al, 2019), Nitrogen pollution in water bodies also increases the risk of methemoglobinemia (Huang et al, 2012), bladder cancer and lung cancer in humans (C. . The studies (C. Q.…”

“…The studies (C. Q. Yu et al, 2019;Zhang et al, 2015) points out that if the total nitrogen concentration in the e uent of domestic wastewater treatment plants in China is reduced from 15mg/L to 5mg/L, the nitrogen discharge from water bodies can be reduced by 5%-10%.…”