Hexavalent chromium removal by various adsorbents: Powdered activated carbon, chitosan, and single/multi-walled carbon nanotubes

Jung, Chanil; Heo, Jiyong; Han, Jung-Geun; Her, Namguk; Lee, Sung–Jae; Oh, Jeill; Ryu, Jaena; Yoon, Yeomin

doi:10.1016/j.seppur.2012.12.028

Cited by 295 publications

(98 citation statements)

References 62 publications

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“…Therefore, the particle size of commercial activated carbon was another important factor for improving the NH 4 + -N adsorption capacity of sandy soil. This result was in agreement with some studies on commercial activated carbon adsorbing other organic matter such as phenol, chromium, and humic acid [52][53][54]. So the smaller commercial activated carbon was, the better its adsorption capacity was, and the more influential its effects on sandy soil adsorbing NH 4 + -N in biogas slurry was [48,55].…”

Section: Effect Of Commercial Activated Carbon With Different Particlsupporting

confidence: 90%

Effects of Three Biochars as Adsorbents on Soils Adsorbing Ammonium Nitrogen in Biogas Slurry

Wang

et al. 2017

Journal of Chemistry

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The increasing concern of biogas slurry disposal and nitrogen loss in soils has brought back the interest in using biochar as an adsorbent of biogas slurry in soils. Three types of biochars, commercial activated carbon, pyrolysis productions derived from rice husk, and nut shell, were added as adsorbents in two types of soils (sandy and loamy) at solid weight ratio of 5%, 10%, 15%, and 20% to investigate the effects of biochars on soils adsorbing ammonium nitrogen (NH 4 + -N) in biogas slurry using oscillation method. There was no difference of NH 4 + -N adsorbability for sand soil and loamy soil. The NH 4 + -N adsorption capacity of soils increased as the additive biochars increased from 0 to 20%. The smaller particle size of biochars led to the shorter stable adsorption time and the better NH 4 + -N adsorption capacity. Commercial activated carbon showed the best NH 4 + -N adsorption capacity in biogas slurry, followed by the nut shell carbon. The rice husk carbon was the worst. The results in this study provide a feasible and cost-effective assessment method of biochars for increasing the NH 4 + -N adsorption capacity of soils in biogas slurry, as well as good insight into effects of different biochars on improving NH 4 + -N adsorption capacity of soils.

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Section: Effect Of Commercial Activated Carbon With Different Particlsupporting

confidence: 90%

Effects of Three Biochars as Adsorbents on Soils Adsorbing Ammonium Nitrogen in Biogas Slurry

Wang

et al. 2017

Journal of Chemistry

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“…3b) may be related to the P adsorption of MLS materials. In this experiment, chitosan was used as local soil modifier, which has the P absorption ability (Jung et al, 2013;Xian, 2008). In contrast to the low initial TP removal, more than 63% of TN was removed from water column (inserted chart in Fig.…”

Section: Effects Of Nutrient Concentration and Its Ratio On Nutrient mentioning

confidence: 99%

Manipulating nutrient limitation using modified local soils: A case study at Lake Taihu (China)

et al. 2016

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a b s t r a c tThe effect of geo-engineering materials of chitosan modified local soil (MLS) on nutrient limitation was studied in comparable whole ponds in Lake Taihu in October 2013. After 20 kg MLS were sprayed in the whole water pond (400 m 2 ), the chlorophyll-a (Chl-a) concentration was decreased from 42 to 18 mg L À1 within 2 h and remained below 20 mg L À1 in the following 15 months, while the average Chl-a was 36 mg L À1 in the control pond throughout the experiment. In situ nutrient addition bioassay experiments indicated that the nutrient limitation was shifted from nitrogen (N) and phosphorus (P) co-limitation to P limitation after MLS treatment from October 2013 to March 2014 compared to the control pond. In the cyanobacterial bloom season of June 2014, N and P co-limitation remained and N was the primary limiting nutrient and P was a secondary one in the control pond where phytoplankton biomass showed significant increase by N addition and further increase by N þ P additions, while both N and P became the limiting nutrient for phytoplankton growth where only combined N and P additions showed significant Chl-a stimulation in the treatment pond. In the next summer (June 2014), a cyanobacteria-dominated state still remained in the control pond but chlorophytes, bacillariophytes and cyanophytes distributed equally and submerged vegetation was largely restored in the treatment pond. Meanwhile, the upper limiting concentration of DIN was enhanced from 0.8 to 1.5 mg L À1 and SRP from 0.1 to 0.3 mg L À1 compared to the control pond. This study indicates that nutrient limitation can be manipulated by using MLS technology.

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“…The removal of heavy metal from aqueous solution consists of physical, chemical and biological techniques. Suggested conventional methods are electrochemical treatment, chemical precipitation, membrane technologies and adsorption on activated carbon [15][16][17]. Among all the methods, adsorption on activated carbon is considered to be one of the method for removal heavy metals from aqueous solutions have been reported earlier [18].…”

Section: Introductionmentioning

confidence: 99%

Comparative Kinetic Study of Removal of Pb2+ Ions and Cr3+ Ions from Waste Water using Carbon Nanotubes Produced using Microwave Heating

Mubarak

Thobashinni

Abdullah

et al. 2016

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A comparative study of the removal of Pb 2+ ions and Cr 3+ ions was conducted to determine the efficiency of carbon nanotubes (CNTs) produced using microwave heating as an adsorbent in removing heavy metal ions from waste water. Optimization of parameters such as adsorbent dosage, pH value, agitation speed, and agitation time was done using the Design Expert software version 6.0. The statistical analysis revealed that optimized conditions for the highest removal for Pb 2+ are at pH 4.0, CNTs dosage of 0.09 g, agitation time and speed of 50 min and 150 rpm respectively. Meanwhile, the highest removal Cr 3+ ions was observed at pH 8.0, CNTs dosage of 0.09 g, agitation time and speed of 60 min and 150 rpm respectively. For the initial concentration of 2 mg/L, the removal efficiency of Pb 2+ ions and Cr 3+ ions were 99.9% and 95.5% respectively. The maximum adsorption capacities of both Pb 2+ ions and Cr 3+ ions onto the CNT were 15.34 mg/g for Pb 2+ ions and 24.45 mg/g for Cr 3+ ions. Besides that, the Langmuir and Freundlich constants for the removal of Pb 2+ ions were 0.073 and 1.438 L/mg while 0.071 and 1.317 L/mg for Cr 3+ ions. The statistical analysis proved that the removal of Pb 2+ ions and Cr 3+ ions fits the Langmuir and Freundlich isotherm models, and both models obeyed the pseudo-second-order.

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Hexavalent chromium removal by various adsorbents: Powdered activated carbon, chitosan, and single/multi-walled carbon nanotubes

Cited by 295 publications

References 62 publications

Effects of Three Biochars as Adsorbents on Soils Adsorbing Ammonium Nitrogen in Biogas Slurry

Effects of Three Biochars as Adsorbents on Soils Adsorbing Ammonium Nitrogen in Biogas Slurry

Manipulating nutrient limitation using modified local soils: A case study at Lake Taihu (China)

Comparative Kinetic Study of Removal of Pb2+ Ions and Cr3+ Ions from Waste Water using Carbon Nanotubes Produced using Microwave Heating

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