Preparation of activated carbon from corn cob and its adsorption behavior on Cr(VI) removal

Abstract

Operation experiments were conducted to optimize the preparation of activated carbons from corn cob. The Cr(VI) adsorption capacity of the produced activated carbons was also evaluated. The impact of the adsorbent dosage, contact time, initial solution pH and temperature was studied. The results showed that the produced corn cob activated carbon had a good Cr(VI) adsorptive capacity; the theoretical maximum adsorption was 34.48 mg g(-1) at 298 K. The Brunauer-Emmett-Teller and iodine adsorption value of the produced activated carbon could be 924.9 m(2) g(-1) and 1,188 mg g(-1), respectively. Under the initial Cr(VI) concentration of 10 mg L(-1) and the original solution pH of 5.8, an adsorption equilibrium was reached after 4 h, and Cr(VI) removal rate was from 78.9 to 100% with an adsorbent's dosage increased from 0.5 to 0.7 g L(-1). The kinetics and equilibrium data agreed well with the pseudo-second-order kinetics model and the Langmuir isotherm model. The equilibrium adsorption capacity improved with the increment of the temperature.

The application of homemade Neosinocalamus affinis AC in electrokinetic removal technology on heavy metal removal from the MSWI fly ash

“…This maybe that in the initial phase, with the extension of the soaking time, phosphoric acid and raw materials were combined gradually, the decomposion and escape of organic matter in the bamboo formed a certain pore, which increased the total specific surface area and promoted the adsorption capacity of resulting AC, so in this phase, there is a gradually decreasing trend of the residual HMs. But with the continued increasing of immersion time, the binding ability between the activator and raw materials was stronger, which prevent the decomposition of organic matter in the raw materials3233, the decrease of the total specific surface and total pore volume weakened the adsorption capacity of the resulting AC.…”

Corncob as an effective, eco-friendly, and economic biosorbent for removing the azo dye Direct Yellow 27 from aqueous solutions

“…During the processing of corn, a large volume of corncobs is generated as agricultural waste [ 19 , 20 ]. The amount of corncobs generated worldwide is approximately 144 million tons per year [ 21 ], and most of it is discarded or burnt, causing serious environmental pollution and no benefit [ 22 , 23 ]. Considering this, corncobs may be used as a value-added biosorbent for the removal of toxic organic and inorganic pollutants from wastewaters [ 22 , 24 ].…”

Unleashing the Biological Potential of Fomes fomentarius via Dry and Wet Milling

“…As dry milling produces a fine powder which can be stored for months and also easily transported, practical applications of these materials are not farfetched, for instance as wound dressings, antioxidant food supplements, agricultural fertilizers and plant protectants, cosmetics, sunscreens, and possibly even as materials, for instance as redox filters in the treatment of oxidizing waste (Figure 9). In some of these applications, the ability of the fruiting body of the dried tinder conk to adsorb and also absorb liquids may be beneficial, similar to uses of dried corncobs as effective eco-friendly absorbants derived from agricultural waste [41][42][43]. These aspects of size reduction, increased surface areas and reactivities and also the biological activities and possible applications associated with the suspensions of Fomes fomentarius clearly require further and more in-depth investigations.…”