Adsorption of arsenic(V) by activated carbon prepared from oat hulls

Chuang, Chih-Yu; Fan, Maohong; Xu, Manman; Brown, Robert C.; Sung, Shihwu; Saha, Basudeb; Huang, Chin‐Pao

doi:10.1016/j.chemosphere.2005.03.012

Cited by 176 publications

(78 citation statements)

References 16 publications

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“…A maximum adsorption capacity of 3.1 mg/g was reported for activated carbon prepared from oat hulls which has a specific area of 522 m 2 /g at initial arsenic concentrations of 25 to 200 g/L [110]. Similarly, a low adsorption capacity for adsorbents with a high surface area was observed by Roy et al [111] on thioglycolated sugarcane carbon (TSCC) as an adsorbent for arsenic removal.…”

Section: Adsorption Isotherm Studies On As(iii) and As(v)mentioning

confidence: 96%

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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This paper presents a comparative review of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) for a better understanding of the conditions and factors during their adsorption with focus on (i) the isotherm adsorption models, (ii) effects of pH, (iii) effects of ionic strength, and (iv) effects of coexisting substances such as anions, cations, and natural organics matter. It provides an indepth analysis of various methods of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) removal by adsorption and the anions' characteristics during the adsorption process. The surface area of the adsorbents does not contribute to the adsorption capacity of these anions but rather a combination of other physical and chemical properties. The adsorption capacity for the anions depends on the combination of all the factors: pH, ionic strength, coexisting substances, pore volume and particles size, surface modification, pretreatment of the adsorbents, and so forth. Extreme higher adsorption capacity can be obtained by the modification of the adsorbents. In general, pH has a greater influence on adsorption capacity at large, since it affects the ionic strength, coexisting anions such as bicarbonate, sulfate, and silica, the surface charges of the adsorbents, and the ionic species which can be present in the solution.

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Section: Adsorption Isotherm Studies On As(iii) and As(v)mentioning

confidence: 96%

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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“…The low O 2 sorption capacity has been confirmed in this work for AC1 and has been determined to be as low as that of nitrogen, that is, ∼1 wt % at 25°C and 1 bar, which suggests that the CO 2 / oxygen selectivity should be similar to the CO 2 /nitrogen selectivity. Unless removed upstream of the Carbon Filter, which may be the case for existing power plants, SO x , NO x , and mercury were reported to have a high affinity for the activated carbon [48][49][50][51][52][53][54][55] and, hence, are expected to be sorbed with CO 2 , as explained in another section of this work. The sorption temperature of ∼25°C is assumed not to change much during the sorption cycle, because the CO 2 heat of sorption is on the low side.…”

Section: Carbon Filter Design Assumptions and Approximationsmentioning

confidence: 99%

“…Ideally, such a sorbent should be relatively insensitive to moisture, but selective to other flue-gas pollutants, such as NO x , SO x , mercury, and arsenic, which would allow for a multifunctional sorbent. Some but not all carbon-rich (carbonaceous) materials, such as activated carbon, charcoal, other coal pyrolysis-derived materials, or even virgin coal, can satisfy these requirements [48][49][50][51][52][53][54][55] and, hence, become the focus of this work.…”

Section: Carbonaceous Sorbents: Co 2 -Selective But Moisture Insensitmentioning

confidence: 99%

Flue-Gas Carbon Capture on Carbonaceous Sorbents: Toward a Low-Cost Multifunctional Carbon Filter for “Green” Energy Producers

Radosz

Krutkramelis

et al. 2008

Ind. Eng. Chem. Res.

205

137

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A low-pressure Carbon Filter Process (patent pending) is proposed to capture carbon dioxide (CO 2 ) from flue gas. This filter is filled with a low-cost carbonaceous sorbent, such as activated carbon or charcoal, which has a high affinity (and, hence, high capacity) to CO 2 but not to nitrogen (N 2 ). This, in turn, leads to a high CO 2 /N 2 selectivity, especially at low pressures. The Carbon Filter Process proposed in this work can recover at least 90% of flue-gas CO 2 of 90%+ purity at a fraction of the cost normally associated with the conventional amine absorption process. The Carbon Filter Process requires neither expensive materials nor flue-gas compression or refrigeration, and it is easy to heat integrate with an existing or grassroots power plant without affecting the cost of the produced electricity too much. An abundant supply of low-cost CO 2 from electricity producers is good news for enhanced oil recovery (EOR) and enhanced coal-bed methane recovery (ECBMR) operators, because it will lead to higher oil and gas recovery rates in an environmentally sensitive manner. A CO 2 -rich mixture that contains some nitrogen is much less expensive to separate from flue-gas than pure CO 2 ; therefore, mixed CO 2 /N 2 -EOR and CO 2 /N 2 -ECBMR methods are proposed to maximize the overall carbon capture and utilization efficiency.

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“…Adsorption was considered to be an efficient way to remove arsenic from natural waters and wastewaters [6]. Activated carbon [8], oxides [9,10], biosorbents [11] and other lowcost adsorbents [12][13][14] were used for arsenic removal. However, the adsorption method requires a regeneration process after the adsorbents being exhausted, which may decrease the capacity of adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of arsenic removal by direct contact membrane distillation

Wang

Hou

et al. 2009

Journal of Hazardous Materials

128

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a b s t r a c t Arsenite (As(III)) and arsenate (As(V)) removal by direct contact membrane distillation (DCMD) were investigated with self-made polyvinylidene fluoride (PVDF) membranes in the present work. Permeability and ion rejection efficiency of the membrane were tested before the arsenic removal experiments. A maximum permeate flux 20.90 kg/m 2 h was obtained, and due to the hydrophobic property, the PVDF membrane had high rejection of inorganic anions and cations which was independent of the solution pH and the temperature. The experimental results indicated that DCMD process had higher removal efficiency of arsenic than pressure-driven membrane processes, especially for high-concentration arsenic and arsenite removal. The experimental results indicated that the permeate As(III) and As(V) were under the maximum contaminant limit (10 g/L) until the feed As(III) and As(V) achieved 40 and 2000 mg/L, respectively. The 250 h simultaneous DCMD performance of 0.5 mg/L As(III) and As(V) solution was carried out, respectively. The permeate arsenic was not detected during the process which showed the PVDF membrane had stable arsenic removal efficiency. Membrane morphology changed slightly after the experiments, however, the permeability and the ion rejection of the membrane did not change.

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Adsorption of arsenic(V) by activated carbon prepared from oat hulls

Cited by 176 publications

References 16 publications

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

Flue-Gas Carbon Capture on Carbonaceous Sorbents: Toward a Low-Cost Multifunctional Carbon Filter for “Green” Energy Producers

Experimental study of arsenic removal by direct contact membrane distillation

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