Fluoride removal by thermally treated egg shells with high adsorption capacity, low cost, and easy acquisition

This research deals with a highly efficient, selective, low-cost, and recyclable adsorbent for the fast removal of lead (Pb)(II) ions from aqueous solutions, and an investigation of the related adsorption mechanisms. Three types of materials were prepared from pea peels waste using simple, energy-efficient and environmentally friendly treatment. Obtained adsorbents were characterized by elemental analysis, infrared spectroscopy, scanning electron microscopy, Boehm titration, and the main parameters were determined. The highest adsorption capacity was observed for the biochar prepared by heating of pea peels at 600°C for 30 minutes. The uptake of Pb(II) ions on pea peels-derived samples was examined as a function of pH, contact time, and initial Pb2+ concentration. Obtained results from adsorption experiments of Pb(II) ions on the biochar surface indicate high adsorption capacity, and the possibility of its preconcentration and selective removal in the presence of zinc(II) and cadmium(II) ions. This confirms a potential application of such materials in water remediation.

Download Full-text

Preparation of Metal Ions Adsorbent with High Adsorption Capacity by Coupling Glycine to Sepharose 4B

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.487.11 ◽

2012 ◽

Vol 487 ◽

pp. 11-14

Author(s):

Zong Hua Qin ◽

Han Ning Cai ◽

Ren Qiang Li

Keyword(s):

Ion Exchange ◽

Metal Ions ◽

Adsorption Capacity ◽

Low Cost ◽

Good Stability ◽

Carboxyl Group ◽

High Adsorption ◽

Coupling Rate ◽

High Adsorption Capacity ◽

Sepharose 4B

After Sepharose 4B polymer beads were activated by using epichlorohydrin, glycine was binded with them to prepare an immobilized carboxyl group ion exchange adsorbent. The coupling rate was that 18.3 mg Gly could be fixed by 1 g of wet Sepharose 4B beads. At pH 9, this adsorbent showed power adsorption to metal ions with Ca2+16.49 mg，Mg2+6.92 mg，Fe2+11.06 mg，Fe3+4.98 mg and Mn2+11.84 mg were respectively adsorbed by 20 g of wet Sepharose 4B beads during saturated adsorption. Moreover, this absorbent possessed the properties with good stability, regeneration easily and low cost.

Download Full-text

Adsorption of fluoride from industrial wastewater using polymer adsorbents: a review

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/945/1/012068 ◽

2021 ◽

Vol 945 (1) ◽

pp. 012068

Author(s):

Chee Yung Pang ◽

Gulnaziya Issabayeva ◽

Chen Hwa Low ◽

Mee Chu Wong

Keyword(s):

Adsorption Capacity ◽

Industrial Wastewater ◽

Membrane Filtration ◽

Chemical Precipitation ◽

Fluoride Removal ◽

High Adsorption ◽

Polymeric Adsorbents ◽

Fluoride Adsorption ◽

High Adsorption Capacity ◽

Removal Technologies

Abstract Fluoride pollution in ground and surface water originates from naturally occurring reactions and industrial activities such as the disposal of industrial wastewater. Amongst different fluoride removal technologies including chemical precipitation, membrane filtration, ion exchange processes, and electrodialysis, adsorption is an attractive method for fluoride removal from wastewater due to its low operational cost, simplicity, and good sustainability. Various adsorbents are used for fluoride removal including, metal oxides and hydroxide, carbonaceous adsorbents, zeolite, polysaccharides, and polyresin adsorbents. This review studies the application of modified polysaccharides and polyresin adsorbents for the removal of fluoride from wastewater. The relationship between the adsorption conditions and the resulting adsorption capacity is thoroughly discussed. Based on the reported studies, modified polysaccharides and polyresins adsorbents can effectively remove fluoride from wastewater achieving high adsorption capacity, the highest being 92.39 mg/g for aluminum impregnated amberlite at pH 3. Furthermore, aluminum impregnated adsorbents reported a higher fluoride adsorption capacity than other modification methods where the three adsorbents with the highest fluoride adsorption capacity are: aluminum impregnated amberlite 92.39 mg/g at pH 3> zirconium immobilized crossed linked chitosan 48.26 mg/g at pH 6 > chitosan/aluminum hydroxide beads 17.68 mg/g at pH 4. In addition, polymeric adsorbents are also highly sustainable as they can be regenerated multiple times to be reused. Therefore, the high adsorption capacity and good regeneration potential allow polymeric adsorbents to serve as promising and sustainable adsorbents to remove fluoride from industrial wastewater.

Download Full-text

High adsorption capacity of thermally treated solid olive wastes to treat olive mill wastewater

Environmental Quality Management ◽

10.1002/tqem.21823 ◽

2021 ◽

Author(s):

Imene Bekri ◽

Zoubida Taleb ◽

Safia Taleb ◽

Salima Tlemsani ◽

Gassan Hodaifa ◽

...

Keyword(s):

Adsorption Capacity ◽

Olive Mill Wastewater ◽

High Adsorption ◽

High Adsorption Capacity ◽

Olive Mill ◽

Thermally Treated

Download Full-text

Application of Thermally Treated Crushed Concrete Granules for the Removal of Phosphate: A Cheap Adsorbent with High Adsorption Capacity

Water Air & Soil Pollution ◽

10.1007/s11270-016-3196-1 ◽

2016 ◽

Vol 228 (1) ◽

Cited By ~ 9

Author(s):

Ku Kang ◽

Chang-Gu Lee ◽

Jae-Woo Choi ◽

Seong-Gu Hong ◽

Seong-Jik Park

Keyword(s):

Adsorption Capacity ◽

High Adsorption ◽

Crushed Concrete ◽

High Adsorption Capacity ◽

Thermally Treated

Download Full-text

Agar-encapsulated adsorbent based on leaf of platanus sp. to adsorb cadmium ion in water

Water Science & Technology ◽

10.2166/wst.2014.190 ◽

2014 ◽

Vol 70 (1) ◽

pp. 89-94 ◽

Cited By ~ 7

Author(s):

Eko Siswoyo ◽

Nozomi Endo ◽

Yoshihiro Mihara ◽

Shunitz Tanaka

Keyword(s):

Citric Acid ◽

Adsorption Capacity ◽

Raw Materials ◽

Low Cost ◽

Adsorption Model ◽

High Adsorption ◽

Cadmium Ion ◽

Solution Ph ◽

Isotherm Adsorption ◽

High Adsorption Capacity

A low cost and environmentally friendly adsorbent was developed based on leaf of platanus sp. to adsorb cadmium ion in water. The adsorbent was modified with citric acid and then also encapsulated in agar for easy separation after the adsorption process. Parameters such as adsorbent dose, stirring time, solution pH and modification of the adsorbent with citric acid were investigated in a batch experiment in order to determine the optimum condition for Cd (II) adsorption. Based on the Langmuir isotherm adsorption model, the adsorption capacity of cadmium ion for raw adsorbent, modified adsorbent with citric acid and encapsulated adsorbent were 3.69, 15.31 and 6.89 mg/g, respectively. The high adsorption capacity after treatment with citric acid may be due to the increase in carboxylic content of the adsorbent surface and also the increase of surface area and pore volume of the adsorbent. With this high adsorption capacity for cadmium ion and an abundance of raw materials, this bio-adsorbent could be considered as a low cost adsorbent in the near future.

Download Full-text

Synthesis and Performance Evaluation of Chitosan/zinc Oxide Nanocomposite as a Highly Efficient Adsorbent in the Removal of Reactive Red 198 From Water

10.21203/rs.3.rs-915379/v1 ◽

2021 ◽

Author(s):

Najmeh Amirmahani ◽

Hakimeh Mahdizadeh ◽

Neda Seyedi ◽

Alireza Nasiri ◽

Ghazal Yazdanpanah

Keyword(s):

Zinc Oxide ◽

Adsorption Capacity ◽

High Efficiency ◽

Low Cost ◽

Industrial Effluents ◽

Textile Wastewater ◽

Secondary Compounds ◽

High Adsorption ◽

Reactive Red 198 ◽

High Adsorption Capacity

Abstract Disposal of textile industrial effluents causes many environmental problems. The presence of chemical dyes in textile wastewater lead to the primary environmental pollution as well as the production of hazardous secondary compounds that are toxic and carcinogenic. In this study, Chitosan and Chitosan-zinc oxide (ZnO) nanocomposite were prepared and selected as a low-cost adsorbent with high adsorption capacity for removing reactive red 198 (RR 198) dye from contaminated. After preparation, it was characterized using Fourier-transform infrared spectroscopy [FT-IR], X-ray diffraction spectrophotometer [XRD], and scanning electron microscopy [SEM]. The effect of pH, temperature, time, adsorbent amount, and initial dye concentration were investigated in the removal efficiency of reactive red 198 (RR 198) dyes. The results showed that the maximum adsorption capacity (qm) obtained from the Langmuir equation was 172.41 mg/g in adsorbent dose of 0.1 g/L, pH: 4, temperature of 25°C, adsorption time of 40 min. The thermodynamic parameters demonstrated the spontaneous and endothermic nature of the adsorption process. Due to the high efficiency of chitosan/ZnO nanocomposite in removal of RR 198 from water and advantages such as high adsorption capacity, simple synthesis, and easy application, it can be used as an effective method in removal of RR 198 from water.

Download Full-text

Mercury Removal from Wastewater by Steamed Hoof Powder

Water Science & Technology ◽

10.2166/wst.1999.0340 ◽

1999 ◽

Vol 40 (7) ◽

pp. 109-116 ◽

Cited By ~ 4

Author(s):

M. H. Ansari ◽

A. M. Deshkar ◽

P. S. Kelkar ◽

D. M. Dharmadhikari ◽

M. Z. Hasan ◽

...

Keyword(s):

Heavy Metals ◽

Adsorption Capacity ◽

Adsorption Process ◽

Adsorption Equilibrium ◽

Light Metal ◽

Mercury Removal ◽

High Adsorption ◽

Surface Sites ◽

Ph Values ◽

High Adsorption Capacity

Steamed Hoof Powder (SHP), size < 53μ, was observed to have high adsorption capacity for Hg(II) with >95% removal from a solution containing 100 mg/L of Hg(II) with only 0.1% (W/V) concentration of SHP. The SHP has good settling properties and gives clear and odour free effluent. Studies indicate that pH values between 2 and 10 have no effect on the adsorption of Hg(II) on SHP. Light metal ions like Na+, K+, Ca2+ and Mg2+ up to concentrations of 500 mg/L and heavy metals like Cu2+, Zn2+, Cd2+, Co2+, Pb2+, Ni2+, Mn2+, Cr3+, Cr6+, Fe2+ and Fe3+ up to concentrations of 100 mg/L do not interfere with the adsorption process. Anions like sulphate, acetate and phosphate up to concentrations of 200 mg/L do not interfere. Chloride interferes in the adsorption process when Hg(II) concentration is above 9.7 mg/L. The adsorption equilibrium was established within two hours. Studies indicate that adsorption occurs on the surface sites of the adsorbent.

Download Full-text