Experimental and statistical investigation of adsorption mechanism of toxic chromium on Al-Fe-Zn oxide nanocomposite and successful application on industrial wastewater

This study used two biosorbents obtained from the aquatic plants Salvinia sp. and Pistia stratiotes to establish a sustainable and alternative treatment for industrial wastewater and other water bodies that contain Pb(II). The biosorbent named Salvinia with NaOH (SOH) was obtained from Salvinia sp., and Salvinia and Pistia mixture with NaOH (SPOH) was obtained from a mixture of the two plants in a 1:1 ratio. The biosorbents were characterized by zeta potential, infrared (IR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive spectroscopy and Boehm titration. The results of Boehm titration and IR analysis indicated the presence of basic functional groups, whereas those of SEM analysis indicated that the biosorbents have a structure conducive to adsorption. Batch adsorption experiments were performed to observe the effects of pH, contact time, initial lead concentration and temperature on the metal removal process. The results revealed that the biosorbents efficiently removed Pb(II) from aqueous solutions, with a maximum observed adsorption capacity (saturation limits, qmax) of 202 mg g−1 and 210.1 mg g−1 for SPOH and SOH, respectively. The Freundlich, Langmuir and Dubinin–Radushkevich models were applied to the data; these biosorbent studies did not satisfactorily adjust to either of the models, but the information obtained helped us understand the adsorption mechanism.

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Adsorption characteristics of bio-adsorbent on chromium(III) in industrial wastewater

Water Science & Technology ◽

10.2166/wst.2015.237 ◽

2015 ◽

Vol 72 (7) ◽

pp. 1051-1061 ◽

Cited By ~ 3

Author(s):

Zhufeng Lu ◽

Hongmei Wang ◽

Jiayou Li ◽

Lixia Yuan ◽

Lianwen Zhu

Keyword(s):

Industrial Wastewater ◽

Adsorption Mechanism ◽

Physical Adsorption ◽

Low Cost ◽

Hydroxyl Groups ◽

Order Model ◽

Surface Hydroxyl ◽

Freundlich Equation ◽

Simple Chemical ◽

Pseudo Second Order

The removal of chromium(III) (Cr(III)) from industrial wastewater by various low-cost methods has been widely investigated. In this paper, a type of bio-adsorbent was prepared using rice straw modified by fermentation and simple chemical treatment. The aim is to detect the adsorption mechanism and characteristics on Cr(III) ions. The analysis shows that the bio-adsorbent possesses four modified characteristics for Cr(III) adsorption. The first one is the acquired physical adsorption involving concave and convex structures. The second one is the effects of the hydrogen bonding surface hydroxyl groups and the metal chromium ion with complexation. The third one is mainly caused by hydrophilic active groups that possess carboxyl and hydroxyl groups during microbial degradation to combine with ions. The final one is the bio-adsorbent had high adsorption for low concentration of Cr(III) ions. The highest removal of around 97.45% was obtained at pH 5.0, bio-adsorption dosage of 0.5 g L−1, and initial Cr(III) concentration of 20 mg L−1. The adsorption process followed the pseudo second-order model (R2 > 0.99), while the isotherms were fitted to the Freundlich equation (68.1926 mg g−1), mainly by chemical adsorption. This study demonstrates the potential of using this biosorbent to remove Cr(III) from both synthetic and industrial wastewater.

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Batch Adsorption, Kinetics, and DFT study of Cd(II) Ion From Aqueous Solution By Low-Cost Starch-Based Activated Carbon

10.20944/preprints202109.0331.v1 ◽

2021 ◽

Author(s):

Saad Melhi alsehri ◽

Bushra Bostan ◽

Saeed Ullah Jan ◽

Adnan Ali Khan ◽

Khan Badsha ◽

...

Keyword(s):

Activated Carbon ◽

Industrial Wastewater ◽

Active Sites ◽

Density Functional ◽

Adsorption Mechanism ◽

Low Cost ◽

Batch Adsorption ◽

Functional Theory ◽

The Density Functional Theory ◽

Ft Ir

Cadmium(II) contamination in the environment is an emerging problem due to its acute toxicity and mobility, so it is very urgent to remove this species from industrial wastewater before it is discharged into the environment. Thus, a starch-based activated carbon (AC) with a specific surface area of 1600 m2g-1 is used as an adsorbent for the capturing of toxic cadmium(II) ions from synthetic solutions. The sorbent is characterized by BET, SEM, TEM, XRD, FT-IR, TGA, and zeta potential. The maximum uptake (284 mg g-1) of Cadmium(II) ion is obtained at pH 6. The thermodynamic parameters like ∆G, ∆H, ΔS are found to be -17.42 kJmol-1, 6.49 kJ mol-1, and 55.66 Jmol-1K-1 respectively, revealing that the adsorption mechanism is endothermic, spontaneous, and feasible. The experimental data follows the D-R and Langmuir models well. The mass transfer is controlled by pseudo 2nd order kinetics. Furthermore, the density functional theory simulations demonstrate that the activated carbon strongly interacted with the Cd(II) ion through its various active sites. The adsorption energy noted for all interactive sites is highly negative (-0.45 eV to -10.03 eV), which shows that the adsorption process is spontaneous and stable which is in agreement with the experimental thermodynamics analysis.

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RESEARCH AND EVALUATE TREATMENT EFFICIENCY ON TAPIOCA PROCESSING INDUSTRIAL WASTEWATER BY AEROBIC BIOFILTER TECHNOLOGY WITH VARIOUS MATERIALS

Science and Technology Development Journal ◽

10.32508/stdj.v13i3.2143 ◽

2010 ◽

Vol 13 (3) ◽

pp. 54-66

Author(s):

Phuong Thi Thanh Nguyen ◽

Phuoc Van Nguyen ◽

Anh Cam Thieu

Keyword(s):

Wastewater Treatment ◽

Industrial Wastewater ◽

Utilization Rate ◽

Organic Loading ◽

Treatment Efficiency ◽

Research Results ◽

Loading Rates

This study was performed to evaluate the efficiency of tapioca processing wastewater treatment using aerobic biofilter with variety of biofilter media: coir, coal, PVC plastic and Bio - Ball BB15 plastic. Research results in the lab demonstrated all four aerobic biofilter models processed can treated completely N and COD which COD reached 90-98% and N reached 61-92%, respectively, at the organic loading rates in range of 0.5, 1, 1.5 and 2 kgCOD/m3.day. The results identified coir filter was the best in four researched materials with removal COD and specific substract utilization rate can reach 98%, and 0.6 kg COD/kgVSS.day. Research results open the new prospects for the application of the cheap materials, available for wastewater treatment.

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