Removal of Chromium(III) and Cadmium(II) Heavy Metal Ions from Aqueous Solutions Using Treated Date Seeds: An Eco-Friendly Method

The aim of the research was to prepare low-cost adsorbents, including raw date pits and chemically treated date pits, and to apply these materials to investigate the adsorption behavior of Cr(III) and Cd(II) ions from wastewater. The prepared materials were characterized using SEM, FT-IR and BET surface analysis techniques for investigating the surface morphology, particle size, pore size and surface functionalities of the materials. A series of adsorption processes was conducted in a batch system and optimized by investigating various parameters such as solution pH, contact time, initial metal concentrations and adsorbent dosage. The optimum pH for achieving maximum adsorption capacity was found to be approximately 7.8. The determination of metal ions was conducted using atomic adsorption spectrometry. The experimental results were fitted using isotherm Langmuir and Freundlich equations, and maximum monolayer adsorption capacities for Cr(III) and Cd(II) at 323 K were 1428.5 and 1302.0 mg/g (treated majdool date pits adsorbent) and 1228.5 and 1182.0 mg/g (treated sagai date pits adsorbent), respectively. It was found that the adsorption capacity of H2O2-treated date pits was higher than that of untreated DP. Recovery studies showed maximal metal elution with 0.1 M HCl for all the adsorbents. An 83.3–88.2% and 81.8–86.8% drop in Cr(III) and Cd(II) adsorption, respectively, were found after the five regeneration cycles. The results showed that the Langmuir model gave slightly better results than the Freundlich model for the untreated and treated date pits. Hence, the results demonstrated that the prepared materials could be a low-cost and eco-friendly choice for the remediation of Cr(III) and Cd(II) contaminants from an aqueous solution.

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Removal and Regeneration of Iron (III) from Water Using New Treated Fluorapatite Extracted from Natural Phosphate as Adsorbent

Biointerface Research in Applied Chemistry ◽

10.33263/briac115.1313013140 ◽

2021 ◽

Vol 11 (5) ◽

pp. 13130-13140

Keyword(s):

Adsorption Capacity ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

Solution Ph ◽

Natural Phosphate ◽

Dissolved Iron ◽

Naturally Occurring ◽

Ft Ir ◽

Adsorption Desorption ◽

Ft Ir Spectroscopy

Our study aims to evaluate the efficiency of dissolved iron (III) retention in synthetic solutions by adsorption on treated natural phosphate collected in the Khouribga region. This research focused on the valorization of phosphate, a naturally occurring resource that is abundant in Morocco. The resulting products were analyzed by various methods, including FT-IR spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). In this work, we studied the effect of several parameters such as adsorbent amount, contact time, solution pH, and initial concentration of iron (III) on the adsorption process. The results of the adsorption of iron (III) indicate that the efficiency was achieved after 5 minutes, and the maximum adsorption capacity calculated from the Langmuir model was 26.18 mg g-1. The regeneration and reuse of synthesized adsorbent are effective for five cycles of adsorption-desorption cycles without reducing adsorption capacity.

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Eco-Structured Adsorptive Removal of Tigecycline from Wastewater: Date Pits’ Biochar versus the Magnetic Biochar

Nanomaterials ◽

10.3390/nano11010030 ◽

2020 ◽

Vol 11 (1) ◽

pp. 30

Author(s):

Marwa El-Azazy ◽

Ahmed S. El-Shafie ◽

Saeed Al-Meer ◽

Khalid A. Al-Saad

Keyword(s):

Low Cost ◽

Maximum Adsorption Capacity ◽

Equilibrium Studies ◽

Magnetic Biochar ◽

Freundlich Isotherms ◽

Bet Analysis ◽

Pseudo Second Order ◽

Ft Ir ◽

Surface Chemistries ◽

Date Pits

Non-magnetic and magnetic low-cost biochar (BC) from date pits (DP) were applied to remove tigecycline (TIGC) from TIGC-artificially contaminated water samples. Pristine biochar from DP (BCDP) and magnetite-decorated biochar (MBC-DP) were therefore prepared. Morphologies and surface chemistries of BCDP and MBC-DP were explored using FT-IR, Raman, SEM, EDX, TEM, and BET analyses. The obtained IR and Raman spectra confirmed the presence of magnetite on the surface of the MBC-DP. SEM results showed mesoporous surface for both adsorbents. BET analysis indicated higher amount of mesopores in MBC-DP. Box–Behnken (BB) design was utilized to optimize the treatment variables (pH, dose of the adsorbent (AD), concentration of TIGC [TIGC], and the contact time (CT)) and maximize the adsorptive power of both adsorbents. Higher % removal (%R), hitting 99.91%, was observed using MBC-DP compared to BCDP (77.31%). Maximum removal of TIGC (99.91%) was obtained using 120 mg/15 mL of MBC-DP for 10 min at pH 10. Equilibrium studies showed that Langmuir and Freundlich isotherms could best describe the adsorption of TIGC onto BCDP and MBC-DP, respectively, with a maximum adsorption capacity (qmax) of 57.14 mg/g using MBC-DP. Kinetics investigation showed that adsorption of TIGC onto both adsorbents could be best-fitted to a pseudo-second-order (PSO) model.

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A functionalized tannin-chitosan bentonite composite with superior adsorption capacity for Cr(VI)

Journal of Polymer Engineering ◽

10.1515/polyeng-2020-0133 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Zhongmin Li ◽

Peng Zou ◽

Junzhou Yang ◽

Miaoyang Huang ◽

Linye Zhang ◽

...

Keyword(s):

Adsorption Capacity ◽

Raw Materials ◽

Low Cost ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

Initial Ph ◽

System Part ◽

Pseudo Second Order ◽

Ft Ir ◽

Xrd Patterns

AbstractA novel functionalized tannin-chitosan bentonite composite (TCBC) was successfully synthesized. The formation of the composite was confirmed by the X-ray diffraction (XRD) patterns and Fourier transform infrared spectroscopy (FT-IR) analysis. The pHpzc of TCBC was 3.38. The influences such as pH, dosage of TCBC, temperature and initial Cr(VI) concentration on adsorption capacity were investigated. The experimental data indicated that the almost saturated adsorption of the TCBC towards Cr(VI) in 100 min. The maximum adsorption capacity was 262.08 mg/g at 333 K with initial pH = 2.5. The adsorption kinetics of Cr(VI) on TCBC followed the pseudo-second-order kinetics model. The isothermal data were well described by the models of Langmuir, Freundlich and Temkin. The results revealed that the adsorption of Cr(VI) on TCBC existed comprehensive effects and mainly belong to the chemisorption. The TCBC could keep good performances (qe = 192.17 mg/g) in five runs, 1 M NaOH was used as eluent for desorption, which showed a high desorption efficiency. Studies showed TCBC prepared with low cost and green raw materials, and simple green preparation technology had high adsorption capacity, good reusability and acidic tolerance. By exploring the Cr(VI)-Cr(III) hybrid system, part of Cr(VI) was reduced to Cr(III) and adsorbed by TCBC. The optimal adsorption pH of Cr(III) was 5.0.

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Adsorption of Congo red from aqueous solution onto shrimp shell powder

Adsorption Science & Technology ◽

10.1177/0263617418768945 ◽

2018 ◽

Vol 36 (5-6) ◽

pp. 1310-1330 ◽

Cited By ~ 21

Author(s):

Youzhou Zhou ◽

Liuqin Ge ◽

Neng Fan ◽

Meisheng Xia

Keyword(s):

Adsorption Capacity ◽

Congo Red ◽

Low Cost ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Treatment Area ◽

Solution Ph ◽

Shrimp Shell ◽

Simple Processing ◽

Shell Powder

Two novel adsorbents derived from shrimp shell were prepared and their adsorption performances on Congo red were investigated. The results suggested that treated shrimp shell powder exhibited a higher adsorption capacity than raw shrimp shell powder. The factors of initial concentration, solution pH, adsorption time, and temperature were investigated. The maximum adsorption capacity of treated shrimp shell powder calculated according to the Langmuir isotherm model was 288.2 mg/g, which is much higher than that of chitin. The adsorption behavior could be fitted well by the pseudo-second-order kinetic model. Intra-particle diffusion model was also used to study the adsorption process. The thermodynamic parameters indicated the spontaneous and endothermic nature of the adsorption. Shrimp shell powder exhibited enough advantages such as large adsorption capacity, low cost, simple processing methods and high specific gravity compared with chitin or chitosan. This work confirmed that the shrimp shell biosorbent had a potential to be applied in dye wastewater treatment area.

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Fabrication of GO/PAN Nanofiber Membrane Grafted With Chitosan As Efficient Adsorbent For Dye Removal

10.21203/rs.3.rs-962554/v1 ◽

2021 ◽

Author(s):

Yanran Lu ◽

Wen Zhang ◽

Mei Wang ◽

Hua Zhang ◽

Jiahui Li ◽

...

Keyword(s):

Adsorption Capacity ◽

Low Cost ◽

Maximum Adsorption Capacity ◽

Nanofiber Membrane ◽

Sunset Yellow ◽

Solution Ph ◽

Environmental Friendliness ◽

Regeneration Rate ◽

Isotherm Study ◽

Pan Nanofiber

Abstract The adsorption is widely used to remove dyes from wastewater because of its low cost, simple preparation, and environmental friendliness. However, the existing adsorbents suffer from difficult recycling, inconvenient use, and low regeneration rate. In this study, polyacrylonitrile (PAN) and graphene oxide (GO) was mixed for electrospinning GO/PAN nanofiber membrane and then chitosan (CS) was grafted to obtain CS-GO/PAN nanofiber membrane. CS-GO/PAN membrane were characterized with FE-SEM, EDX, FT-IR and, WCA. The effects of membrane types, dosage, solution pH on the removal of dye sunset yellow (SY) were systematically investigated. The results showed that more than 80% of SY were removed within 15 min at pH 2 using 100 mg CS-GO/PAN membrane. Adsorption kinetic data were fitted well with the pseudo-second-order model and adsorption equilibrium achieved within 240 min. The isotherm study followed the Langmuir model with the actual maximum adsorption capacity of 211.54 mg/g. After 5 adsorption-desorption cycles, the adsorption efficiency and the desorption efficiency of CS-GO/PAN were over 90% and 93%, respectively. Moreover, the membrane recovered easily from the water while its integrity was still maintained. The CS-GO/PAN membrane demonstrates the virtue of high adsorption capacity, easy operation, and good reusability, which could be considered as a promising material for adsorbing dyes in wastewater.

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BIJI BUAH BISBUL (Diospyros blancoi) SEBAGAI BIOSORBEN Cr(III)

Jurnal Sains Natural ◽

10.31938/jsn.v8i2.157 ◽

2018 ◽

Vol 8 (2) ◽

pp. 70

Author(s):

Nina Ariesta ◽

Risansyah Rifansyah ◽

Dian Arrisujaya ◽

Mamay Maslahat

Keyword(s):

Metal Ions ◽

Low Cost ◽

Apple Fruit ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Adsorption Efficiency ◽

Optimum Conditions ◽

Batch Method ◽

Solution Ph ◽

Biosorption Equilibrium

Velvet Apple Fruit Seeds (Diospyros blancoi) as Biosorbent of Cr(III) Velvet Apple Fruit (Diospyros blancoi) has not been explored more in Indonesia. The purpose of research was to explore the use of Velvet Apple Fruit seeds as adsobent of Cr(III) in waste. Biosorbent of velvet apple fruit seeds in removing Cr (III) metal ions has been investigated using batch method. Several parameters were used to determine absorption optimum conditions such as solution pH, contact time and biosorbent dosage. Langmuir, Freundlich and Temkin isotherm models were used in determining biosorption equilibrium. FTIR and SEM-EDX were used to characterize the velvet apple fruit seeds biosorbent. The equilibrium adsorption isotherms showed the velvet apple fruit seeds biosorbent had a maximum adsorption capacity of 5.592 mg/g. The adsorption efficiency of Cr (III) ion by velvet apple fruit seeds was 81.78%. The results showed that velvet apple fruit seeds potentially as an alternative low-cost biosorbent for removing heavy metal ions in solution.Keywords: biosorption, heavy metals, alternative biosorbent, waste water treatmentABSTRAK Buah bisbul di Indonesia belum tereksplor dengan baik potensinya. Tujuan penelitian adalah untuk megetahui potensi biji buah Bisbul sebagai adsorben logam Cr(III) pada limbah. Biosorben biji buah bisbul (Diospyros blancoi) dalam menyerap ion logam Cr(III) telah diteliti dengan menggunakan metode batch. Beberapa parameter digunakan untuk menentukan kondisi optimum penyerapan seperti pH larutan, waktu kontak dan dosis biosorben. Model isoterm Langmuir, Freundlich dan Temkin dipakai dalam menentukan kesetimbangan biosorpsi. FTIR dan SEM-EDX digunakan dalam mengkarakterisasi biosorben biji buah bisbul. Isoterm adsorpsi kesetimbangan menunjukkan biosorben biji buah bisbul mempunyai kapasitas adsorpsi maksimum 5,592 mg/g. Efisiensi penyerapan ion Cr(III) oleh biji buah bisbul mencapai 81,78%. Hasil penelitian menunjukkan bahwa biji buah bisbul berpotensi sebagai alternatif biosorben murah dalam menghilangkan ion logam berat dalam larutan.Kata kunci: biosorpsi, logam berat, alternatif biosorben, pengolahan air limbah

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Removal of Arsenic from Wastewater by Using Pretreating Orange Peel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.773.889 ◽

2013 ◽

Vol 773 ◽

pp. 889-892 ◽

Cited By ~ 1

Author(s):

Yuan Peng ◽

Hong Yan Xiao ◽

Xian Zhong Cheng ◽

Hong Mei Chen

Keyword(s):

Aqueous Solutions ◽

Adsorption Capacity ◽

Contact Time ◽

Low Cost ◽

Orange Peel ◽

Local Fields ◽

Maximum Adsorption Capacity ◽

Solution Ph ◽

Adsorption Removal ◽

Removal Of Arsenic

The use of low-cost and eco-friendly adsorbents has been investigated as an ideal alternative to the currentexpensive methods of removing arsenic from wastewater. Orange peel was collected from the local fields of orangetrees and converted into a low-cost adsorbent. The effects of solution pH, contact time, and concentration of orange peel have beenstudied. The maximum adsorption capacity calculated from the Langmuirisotherm model was 43.69 mg g-1,Based on the adsorption capacity, the pretreating orange peel was shown to be promising materials for adsorption removal ofarsenics from aqueous solutions.

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Preparation and Characterization of Polyamidoxime Chelating Resin from Rubberwood Fibre-G-Polyacrylonitrile

Adsorption Science & Technology ◽

10.1260/0263-6174.27.7.661 ◽

2009 ◽

Vol 27 (7) ◽

pp. 661-670 ◽

Cited By ~ 7

Author(s):

Faraj A. Abuilaiwi ◽

Muataz Ali Atieh ◽

Mansor B. Ahmad ◽

Nor Azowa Ibrahim ◽

Mohamad Zaki Ab. Rahman ◽

...

Keyword(s):

Ion Exchange ◽

Metal Ions ◽

Adsorption Capacity ◽

Exchange Resin ◽

Cation Exchange Resin ◽

Ion Exchange Resin ◽

Chelating Resin ◽

Solution Ph ◽

Ft Ir

Grafted rubberwood fibre was converted to polyamidoxime ion-exchange resin in order to remove heavy metal ions from aqueous solution. The cation-exchange resin existed predominantly in the syn-hydroxyamino form. The water uptake by the resin was ca. 31 g/g dry resin while its hydrogen ion capacity was 3.6 mmol/g. The adsorption capacity of the resin towards different metal ions from wastewater was determined at different pH values within the range 1–6. The prepared chelating ion-exchanger exhibited the highest adsorption capacity towards Cu2+ ions (3.83 mmol/g), followed by Cd2+, Fe3+, Pb2+, Ni2+ and Co3+ ions, respectively. The results showed that the adsorption capacity depended on the solution pH. Polyamidoxime ion-exchange resin was also used to separate Co3+ and Ni2+ ions from Cu2+ ions using a column technique. On passing Cu2+/Ni2+ and Cu2+/Co3+ ion mixtures through the resin at pH 3, Cu2+ ions were adsorbed by the resin but no sorption of Ni2+ or Co3+ ions was detected. Approximately 98% of the Cu2+ ions could be desorbed from the resin. FT-IR spectroscopy was used to confirm the conversion of polyacrylonitrile-g-rubberwood fibre to polyamidoxime.

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Competitive Biosorption of Pb(II) and Cu(II) by Functionalised Micropogonias undulates Scales

Recent Innovations in Chemical Engineering (Formerly Recent Patents on Chemical Engineering) ◽

10.2174/2405520413999200623174612 ◽

2020 ◽

Vol 13 ◽

Author(s):

Joshua O. Ighalo ◽

Ibrahim O. Tijani ◽

Oluwaseun J. Ajala ◽

Fisayo O. Ayandele ◽

Omodele A. Eletta ◽

...

Keyword(s):

Adsorption Capacity ◽

Low Cost ◽

Fish Scales ◽

Wet Impregnation ◽

Monolayer Adsorption ◽

Competitive Biosorption ◽

Langmuir Isotherm Model ◽

Pseudo Second Order ◽

Ft Ir ◽

Best Fit

Background: Modified bio-based adsorbents from plant sources can be used for pollution remediation by adsorption due to their low cost and availability in large quantities. Objective: In this study, the competitive biosorption of Pb(II) and Cu(II) by Micropogonias undulates functionalised fish scales (FFS) was conducted. The functionalisation was done by wet impregnation with Fe2+. Method: The biosorbent was characterised by Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy with Energy-Dispersive X-ray Spectroscopy (SEM-EDS) and Branueur–Emmett–Teller (BET) analyses. Results: The major constituents in the FFS were calcium and phosphorus from the collagen and apatite on the scales. Optimum removal efficiency for both metals was >99% at 10 g/l dosage. It was observed that the Langmuir isotherm model and the pseudo second order kinetics model were the best fit for the experimental data. The monolayer adsorption capacity of FFS for Pb(II) and Cu(II) was observed to be 96.15 mg/g and 100 mg/g respectively. Conclusion: The study revealed that the competitive biosorption of heavy metals can be achieved (at a good adsorption capacity) using functionalised Micropogonias undulates fish scales.

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Adsorptive and Coagulative Removal of Trace Metals from Water Using Surface Modified Sawdust-Based Cellulose Nanocrystals

J ◽

10.3390/j4020016 ◽

2021 ◽

Vol 4 (2) ◽

pp. 193-205

Author(s):

Opeyemi A. Oyewo ◽

Sam Ramaila ◽

Lydia Mavuru ◽

Taile Leswifi ◽

Maurice S. Onyango

Keyword(s):

Trace Metals ◽

Adsorption Capacity ◽

Cellulose Nanocrystals ◽

Inductively Coupled Plasma ◽

Electrostatic Interactions ◽

Natural Waters ◽

Maximum Adsorption Capacity ◽

Solution Ph ◽

Major Drawback ◽

Surface Modified

The presence of toxic metals in surface and natural waters, even at trace levels, poses a great danger to humans and the ecosystem. Although the combination of adsorption and coagulation techniques has the potential to eradicate this problem, the use of inappropriate media remains a major drawback. This study reports on the application of NaNO2/NaHCO3 modified sawdust-based cellulose nanocrystals (MCNC) as both coagulant and adsorbent for the removal of Cu, Fe and Pb from aqueous solution. The surface modified coagulants, prepared by electrostatic interactions, were characterized using Fourier transform infrared, X-ray diffraction (XRD), and scanning electron microscopy/energy-dispersive spectrometry (SEM/EDS). The amount of coagulated/adsorbed trace metals was then analysed using inductively coupled plasma atomic emission spectroscopy (ICP-AES). SEM analysis revealed the patchy and distributed floccules on Fe-flocs, which was an indication of multiple mechanisms responsible for Fe removal onto MCNC. A shift in the peak position attributed to C2H192N64O16 from 2θ = 30 to 24.5° occurred in the XRD pattern of both Pb- and Cu-flocs. Different process variables, including initial metal ions concentration (10–200 mg/L), solution pH (2–10), and temperature (25–45 °C) were studied in order to investigate how they affect the reaction process. Both Cu and Pb adsorption followed the Langmuir isotherm with a maximum adsorption capacity of 111.1 and 2.82 mg/g, respectively, whereas the adsorption of Fe was suggestive of a multilayer adsorption process; however, Fe Langmuir maximum adsorption capacity was found to be 81.96 mg/g. The sequence of trace metals removal followed the order: Cu > Fe > Pb. The utilization of this product in different water matrices is an effective way to establish their robustness.

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