Adsorption Properties of Methyl Orange in Water by Sheep Manure Biochar

Abstract

Sheep manure was used to prepare biochar under pyrolysis temperature of 600ºC. The structural features of biochar were characterized by elemental analysis, BET analysis and scanning electron microscopy. The effects of pH, biochar dosage, adsorption time, temperature on adsorption of methyl orange (MO) in water by sheep manure biochar, as well as its adsorption mechanism, were investigated via batch experiments. The results showed that the sheep manure biochar had large specific surface area, abundant hole structure and high aromaticity and polarity. When temperature was 25ºC, MO concentration was 20 mg/L, initial pH was 4.0, and biochar dosage was 0.6 g/L, the adsorption achieved balance at about 250min, and the MO removal rate reached to 92.55%. Pseudo second-order kinetic model and Langmuir model could more accurately describe the adsorption behavior of MO onto sheep manure biochar, and the theoretical maximum adsorption capacity was 42.513 to 45.563 mg/g. Besides, the process is a favorable adsorption. Thermodynamic studies showed that the adsorption was a spontaneous, endothermic and entropy-increasing process. Sheep manure biochar could be used as a good adsorption material for MO in water, which achieved the goal of controlling waste by waste.

Nano-Silica Modified with Diamine for Capturing Azo Dye from Aqueous Solutions

“…A similar effect of pH on the adsorption of MO on the surface of protonated chitosan was reported by Huang et al (2013) [ 17 ]. Lu et al (2018) reported a decrease in the adsorption capacity of MO on the surface of biochar at a pH higher than 7 due to the deprotonation of the surface and, thus, repulsive force with the anionic dye [ 22 ]. Da’na et al (2022) applied the amine-modified silica with a pH ZPC around 7 to adsorb Zn 2+ by controlling the solution pH at 7.5, which makes the adsorbent surface negatively charged, and they reported 100% removal of this cation [ 32 ].…”

“…Thus far, many adsorbents have been reported for the removal of methyl orange such as chitosan derivatives [ 1 , 17 , 18 ], agriculture waste [ 2 , 19 , 20 , 21 ], biochar [ 3 , 22 ], clay [ 23 ], activated carbon, mesoporous silica, alumina [ 24 ], carbon nanotubes [ 25 ], nanocomposites [ 10 , 12 ], polymers, and many others [ 4 ]. Despite all the progress in this area of research, many challenges still face the application of adsorption at commercial levels due to one or more of the following adsorbent drawbacks: a low adsorption capacity, slow rate of adsorption, biodegradation of the adsorbent, low stability, high cost, complex synthesis procedure, and low selectivity and sensitivity at low concentration levels.…”

Enhanced Adsorption of Methyl Orange from Aqueous Phase Using Chitosan–Palmer Amaranth Biochar Composite Microspheres

“…This interest stems from its large specific surface area, multiple functional groups and good environmental friendliness [15]. At present, biochar sourced from chicken manure [16], rice husk [17], sheep manure [18], mandarin peel [19], pine cone [20], date palm petioles [21], sawdust, bamboo and palm [22] have been investigated for MO adsorption. However, the majority of these biochar adsorbents exhibit limited MO adsorption capacities (lower than 100 mg/g) [16][17][18][19][20]22].…”

“…At present, biochar sourced from chicken manure [16], rice husk [17], sheep manure [18], mandarin peel [19], pine cone [20], date palm petioles [21], sawdust, bamboo and palm [22] have been investigated for MO adsorption. However, the majority of these biochar adsorbents exhibit limited MO adsorption capacities (lower than 100 mg/g) [16][17][18][19][20]22]. Hence, there exists a necessity to develop biochar-derived adsorbents with enhanced MO adsorption capabilities to ensure effective dye removal.…”