Aerobic granular sludge-derived activated carbon: mineral acid modification and superior dye adsorption capacity

RSC Advances ◽  
2015 ◽  
Vol 5 (32) ◽  
pp. 25279-25286 ◽  
Author(s):  
Ge Zhang ◽  
Li Shi ◽  
Yongfang Zhang ◽  
Dong Wei ◽  
Tao Yan ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Sulfuric Acid ◽  
Nitric Acid ◽  
Adsorption Capacity ◽  
Zinc Chloride ◽  
Dye Adsorption ◽  
Granular Sludge ◽  
Mineral Acid ◽  
Aerobic Granular Sludge ◽  
Acid Modification

A novel aerobic granular sludge-derived activated carbon (AC) was prepared by a zinc chloride activation method and further modified by mineral acid (nitric acid (NA) and sulfuric acid (SA)).

Characteristics of Activated Carbon Modified with Nitric Acid and its Performance in Catalytic Ozonation of Acid Red 3R

2013 ◽  
Vol 726-731 ◽  
pp. 1687-1690
Author(s):  
Jing Zhang ◽  
Jian Song Liu ◽  
Chun Liu ◽  
Jing Liang Yang ◽  
Lei Zhang
Keyword(s):  
Activated Carbon ◽  
Nitric Acid ◽  
Adsorption Capacity ◽  
Functional Groups ◽  
Chemical Properties ◽  
Catalytic Ozonation ◽  
Alkaline Condition ◽  
Ozone Decomposition ◽  
Acid Modification ◽  
Modified Activated Carbon

The structure and surface chemical properties of activated carbon after nitric acid modification and their influences on adsorption and catalytic ozonation of acid red 3R were investigated. The results showed that both specific surface area and micropore volume of activated carbon decreased, but mesopore volume increased after nitric acid modification. The adsorption capacity and catalytic ozonation performance of modified activated carbon were influenced due to the increased surface acidic functional groups. The adsorption capacity of modified activated carbon was enhanced under acidic condition due to dispersion interaction between increased surface acidic functional groups and acid red 3R. The increase in surface acidic functional groups of activated carbon was also considered to be responsible for improvement of the catalytic ozonation of acid red 3R under alkaline condition, because of their participation in the ozone decomposition and OH generation.

Anaerobic granular sludge-derived activated carbon: preparation, characterization and superior dye adsorption capacity

2015 ◽  
Vol 57 (38) ◽  
pp. 18016-18027 ◽  
Author(s):  
Ge Zhang ◽  
Tao Yan ◽  
Dong Wei ◽  
Liangguo Yan ◽  
Xiaodong Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Dye Adsorption ◽  
Granular Sludge ◽  
Anaerobic Granular Sludge

Effect of Modification with Nitric Acid and Hydrogen Peroxide on Chromium (VI) Adsorption by Activated Carbon Fiber

2012 ◽  
Vol 518-523 ◽  
pp. 2099-2103
Author(s):  
Guang Zhou Qu ◽  
Hai Bing Ji ◽  
Ran Xiao ◽  
Dong Li Liang
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Carbon ◽  
Nitric Acid ◽  
Carbon Fiber ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Ph Value ◽  
Activated Carbon Fiber ◽  
Order Kinetic ◽  
Adsorption Amount

The activated carbon fiber (ACF) was treated by different concentration nitric acid (HNO3) and hydrogen peroxide (H2O2) oxidization to enhance its adsorption capacity to hexavalent chromium (Cr6+) ion. The adsorption amount and adsorption kinetics of Cr6+ion on ACFs, and the surface chemical groups were investigated. The results showed that the modified ACFs with 1% HNO3and 10% H2O2had a better adsorption capacity, respectively. The adsorption amount of ACFs was affected strongly solution pH value, and decreased significantly with increasing of the pH value. The adsorption kinetics indicated that the adsorption rates of Cr6+ ion on different modified ACFs were well fitted with the pseudo-second-order kinetic model. After 1% HNO3and 10% H2O2modification, respectively, the total acidic oxygen-containing groups on ACFs surface had an increase obviously, which might be enhance the adsorption amount of Cr6+ion on ACFs.

Coupling ultrafiltration and adsorption onto activated carbon cloth: application to the treatment of highly coloured wastewaters

2000 ◽  
Vol 42 (5-6) ◽  
pp. 355-362 ◽  
Author(s):  
H. Pignon ◽  
C. Brasquet ◽  
P. Le Cloirec
Keyword(s):  
Molecular Weight ◽  
Activated Carbon ◽  
Adsorption Capacity ◽  
Membrane Filtration ◽  
Flow Reactor ◽  
Great Influence ◽  
Dye Adsorption ◽  
Operating Conditions ◽  
Carbon Cloth ◽  
Kinetics And Isotherms

The aim of this work is to evaluate the efficiency of Activated Carbon Cloths (ACCs) as a refining treatment of membrane filtration in the case of effluent streams containing both dyes and suspended solids (SS) or colloids responsible for turbidity. It is divided into two parts. First, dye adsorption experiments are carried out. Kinetics and isotherms enable us to show the feasibility of the adsorption and to study the influence of different operating conditions. The results demonstrate that adsorption is enhanced under acidic conditions, the adsorption capacity being increased by 40% in some cases. Moreover, microscopic characteristics of ACCs have a great influence on the adsorption process: there is a relationship between the adsorbent porosity and the adsorbate molecular weight, the mesoporous adsorbent being more efficious to remove the larger molecular weight dyes. In the case of low molecular weight compounds, the adsorbent with the higher specific surface area provides the greater adsorption capacity. Molecular connectivity indexes were used to confirm the correlation of the molecular structure of the adsorbates with their adsorbability. The second part consists of an estimation of the efficiency of the coupling of ultrafiltration and adsorption onto ACC. Tests performed on a laboratory-scale coupling show that a molecular weight cut-off of 3,000 D gives rise to a 98% removal of turbidity whereas dyes are not much retained. Furthermore, ultrafiltration is useful in improving the adsorption capacities of ACC in a continuous flow reactor (up to 50%).

scholarly journals New Activated Carbon from Mine Coal for Adsorption of Dye in Simulated Water or Multiple Heavy Metals in Real Wastewater

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2498 ◽  
Author(s):  
Marwa Elkady ◽  
Hassan Shokry ◽  
Hesham Hamad
Keyword(s):  
Activated Carbon ◽  
Nitric Acid ◽  
Metal Ions ◽  
Low Cost ◽  
Dye Adsorption ◽  
Chemical Properties ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Physico Chemical ◽  
Multiple Heavy Metals

Nano-activated carbon (NAC) prepared from El-Maghara mine coal were modified with nitric acid solution. Their physico-chemical properties were investigated in terms of methylene blue (MB) adsorption, FTIR, and metal adsorption. Upon oxidation of the ACS with nitric acid, surface oxide groups were observed in the FTIR spectra by absorption peaks at 1750–1250 cm−1. The optimum processes parameters include HNO3/AC ratio (wt./wt.) of 20, oxidation time of 2 h, and the concentration of HNO3 of 10% reaching the maximum adsorption capacity of MB dye. Also, the prepared NAC was characterized by SEM, EDX, TEM, Raman Spectroscopy, and BET analyses. The batch adsorption of MB dye from solution was used for monitoring the behavior of the most proper produced NAC. Equilibrium isotherms of MB dye adsorption on NAC materials were acquired and the results discussed in relation to their surface chemistry. Langmuir model recorded the best interpretation of the dye adsorption data. Also, NAC was evaluated for simultaneous adsorption of six different metal ions (Fe2+, Ni2+, Mn2+, Pb2+, Cu2+, and Zn2+) that represented contaminates in petrochemical industrial wastewater. The results indicated that the extracted NAC from El-Maghara mine coal is considered as an efficient low-cost adsorbent material for remediation in both basic dyes and metal ions from the polluted solutions.

Commercial Activated Carbon Modified with Sulfuric Acid: A Potential Permeable Reactive Barrier Material for In Situ Remediation of Cr(VI) from Groundwater

2011 ◽  
Vol 343-344 ◽  
pp. 172-176
Author(s):  
Jun Ping Liu ◽  
Huan Zhen Zhang ◽  
Xiao Meng Liu
Keyword(s):  
Activated Carbon ◽  
Sulfuric Acid ◽  
Adsorption Capacity ◽  
Permeable Reactive Barrier ◽  
Contaminated Groundwater ◽  
Batch Studies ◽  
Reactive Barrier ◽  
Chemically Modified ◽  
Synthetic Groundwater

In this study, removal of Cr(Ⅵ) from synthetic groundwater by adsorption onto commercial activated carbon (CAC) made up of coconut shell is investigated in batch studies. Surface modification of CAC with sulfuric acid is also conducted to evaluate its removal performance. It is evident that CAC chemically modified with sulfuric acid (sulfuric-treated CAC) demonstrates higher Cr(Ⅵ) removal efficiency than non-treated CAC in dealing with contaminated groundwater with the pH is about 7.0, suggesting that sulfuric-treated CAC is suitable for the in-situ remediation of Cr(Ⅵ) contaminated groundwater. Adsorption of Cr(Ⅵ) is strongly affected by pH, the granular sulfuric-treated CAC exhibits the highest Cr(Ⅵ) adsorption capacity at pH 1.5 and the maximum Cr(Ⅵ) adsorption capacity of which estimated with the Langmuir model was 8.24mg/g.

Biosorbent from Petai (Parkia speciosa) Residue for Removing Lead Ion in Aqueous Solution: FTIR Analysis and Adsorption Characteristics Study

2019 ◽  
Vol 818 ◽  
pp. 77-81
Author(s):  
Ajeng Yulianti Dwi Lestari ◽  
Achmad Chafidz
Keyword(s):  
Aqueous Solution ◽  
Sulfuric Acid ◽  
Sodium Hydroxide ◽  
Adsorption Capacity ◽  
Adsorption Isotherms ◽  
Adsorption Process ◽  
Lead Ion ◽  
Batch Adsorption ◽  
Ftir Analysis ◽  
Acid Modification

Removing lead ion in aqueous solution using petai (Parkia speciosa) residue was done well. Petai residue is modified with sodium hydroxide and sulfuric acid before batch adsorption process occured. The results showed that the highest adsorption capacity was found in acid modification that was 2.62 mg/g.Temkin and Dubininmodels fit the adsorption isotherms of all adsorbents.

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