Lead adsorption on loess under high ammonium environment

Abstract Industrialization increases the number of heavy metals released into the environment. Lead (Pb2+), nickel (Ni2+) and chromium (Cr6+) are among these toxic metals and cause irreversible effects on ecosystems and human health due to their bio-accumulative potential. The decontamination through adsorption processes using lignocellulosic wastes from agricultural and/or forestry processes is a viable solution. Hence, this work aimed at studying the effect of pH on the biosorption of the metal ions using four different by-product materials: walnut shell, chestnut shell, pinewood and burnt pinewood. These experiments were conducted with solutions of the three heavy metals in which the adsorbents were immersed to measure the rate of adsorption. A range of pH values from 3.0 to 7.5 was used in the experiments, and the concentrations were determined by atomic absorption. The results showed different behaviour of the biosorbent materials when applied to the different metals. The lead adsorption had an ideal pH in the range of 5.5–7.5 when the walnut shell was used as an adsorbent, corresponding to values of adsorption greater than 90%, but for the other materials, maximum adsorption occurred for a pH of 7.5. For the adsorption of chromium, the pH was very heterogeneous with all adsorbents, with optimal values of pH varying from 3.0 (for chestnut shell) to 6.5 (for walnut shell and wood). For nickel, the best pH range was around pH 5, with different values according to the lignocellulosic material used. These results indicate that the tested biosorbents have the potential to decontaminate wastewater in variable extensions and that by controlling the pH of the solution; a more efficient removal of the heavy metals can be achieved.

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Preparation of Biochar and Its Metal Complexes and Study on Their Lead Adsorption Properties

Integrated Ferroelectrics ◽

10.1080/10584587.2020.1728829 ◽

2021 ◽

Vol 213 (1) ◽

pp. 53-66

Author(s):

Qing Zhang ◽

Meina Liang ◽

Xiaozhang Yuan ◽

Shuiping Xu ◽

Lili Huang

Keyword(s):

Metal Complexes ◽

Adsorption Properties ◽

Lead Adsorption

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Nanostructured Didymosphenia geminata-based membrane for efficient lead adsorption from aqueous solution

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2021.105269 ◽

2021 ◽

Vol 9 (4) ◽

pp. 105269

Author(s):

Elias Reinoso-Guerra ◽

Juliet Aristizabal ◽

Bárbara Arce ◽

Elsie Zurob ◽

Geraldine Dennett ◽

...

Keyword(s):

Aqueous Solution ◽

Lead Adsorption ◽

Didymosphenia Geminata

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Measurements of Metal Adsorption in Oxide-Clay Mixtures: “Competitive-Additivity” Among Mixture Components

MRS Proceedings ◽

10.1557/proc-294-791 ◽

1992 ◽

Vol 294 ◽

Cited By ~ 3

Author(s):

V. S. Tripathi ◽

M.D. Siegel ◽

Z. S. Kooner

Keyword(s):

Surface Complexation ◽

Particle Interactions ◽

Complexation Constants ◽

Lead Adsorption ◽

Adsorption Sites ◽

Adsorption Behaviors ◽

Limited Success ◽

Ph Dependent ◽

Waste Repositories ◽

Zinc Adsorption

ABSTRACTAn important question concerning the transport of radionuclides from nuclear waste repositories is whether the adsorption of metals by rocks and soils can be predicted from the properties of the constituent minerals. Attempts by previous researchers to use sorption models based on linear adsorption or weighted "sorptive additivity" have met with limited success. In this study, a “competitive-additivity” model based on surface complexation theory was used to model the pH-dependent adsorption of lead by goethite/Ca-montmorillonite mixtures using complexation constants obtained from single sorbent systems. Measurements of lead adsorption by goethite, Ca-montmorillonite, and goethite-Ca-montmorillonite mixtures (and similar studies of copper and zinc adsorption) demonstrate that the two adsorbents compete for adsorption of metals over wide ranges of pH and concentrations of adsorbents and metals. The adsorption behaviors of the mixtures are determined by the relative concentrations of the adsorbents and their respective affinities for the adsorbate metal. Particle-particle interactions such as heterocoagulation of the oxide and clay do not appear to be significant for the majority of the adsorption sites in this system.

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A comparative study of lead adsorption by activated Khaya Ivoresnsis and Pycanthus Angolensis sawdust

Journal of Water Sanitation and Hygiene for Development ◽

10.2166/washdev.2016.070 ◽

2016 ◽

Vol 6 (4) ◽

pp. 593-601

Author(s):

Chidozie Charles Nnaji ◽

Stephen Chinwike Emefu

Keyword(s):

Experimental Data ◽

Freundlich Isotherm ◽

Intraparticle Diffusion ◽

Bulk Liquid ◽

Timber Species ◽

Particle Sizes ◽

Lead Adsorption ◽

Intraparticle Diffusion Model ◽

First Order Kinetics ◽

Good Agreement

Experiments investigating lead adsorption by activated sawdust of different particle sizes of two timber species were conducted. The experimental data were fitted to isothermal and kinetic models. The optimum particle size was 0.85 mm for Khaya ivorensis and 1.18 mm for Pycanthus angolensis. The adsorption of lead by Khaya ivorensis and Pycanthus angolensis conformed to the Langmuir isotherm (0.83 ≤ R2 ≤ 0.96 and 0.86 ≤ R2 ≤ 0.98, respectively) and Freundlich isotherm (0.69 ≤ R2 ≤ 0.97 and 0.94 ≤ R2 ≤ 1.0, respectively). The adsorption process for the two species of timber was controlled by solute transport in the bulk liquid and intraparticle diffusion which was confirmed by good agreement of experimental data with pseudo-first-order kinetics (0.96 ≤ R2 ≤ 1.0 for Khaya ivorensis and 0.9 ≤ R2 ≤ 1.0 for Pycanthus angolensis) and the intraparticle diffusion model (0.9 ≤ R2 ≤ 0.99 for Khaya ivorensis and 0.84 ≤ R2 ≤ 0.97 for Pycanthus angolensis). A new kinetic model was developed with R2 of 0.93 ≤ R2 ≤ 0.99 for Khaya ivorensis and 0.88 ≤ R2 ≤ 1.0 for Pycanthus angolensis.

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Impact of Buffering Agent on Lead Adsorption of Bentonite: An Appraisal

Journal of Environmental Engineering ◽

10.1061/(asce)ee.1943-7870.0001965 ◽

2022 ◽

Vol 148 (2) ◽

Author(s):

C. B. Gupt ◽

Sreedeep Sekharan ◽

D. N. Arnepalli

Keyword(s):

Lead Adsorption ◽

Buffering Agent

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Lead Adsorption in Lubricant Waste using Zeolite

Jurnal Rekayasa Proses ◽

10.22146/jrekpros.49489 ◽

2020 ◽

Vol 14 (1) ◽

Author(s):

'Aini Rahmadhaniar ◽

Ratri Ariatmi Nugrahani ◽

Nurul Fithriyah ◽

Titik Lestariningsih

Keyword(s):

Contact Time ◽

Adsorption Process ◽

Lead Content ◽

Government Regulations ◽

Lead Adsorption ◽

Zeolite Adsorbent

Lubricant waste is one of the hazardous refuses which are regulated on the limit of lead content according to Government Regulations (Kep-51/MenLH/10/1995). Therefore, it is necessary to research for reducing the lead content. The purpose of this study is to understand the effect of adding adsorbents to decrease lead content in waste of lubricants taken from ships. The waste lubricant was recycled by adsorption using zeolite. Lubricant waste samples of 200 mL each were physically and chemically identified subjected to adsorption process using zeolite adsorbent whose concentrations (%w/w) were varied as follows: 7.5%, 13.25%, 14.25%, 15.75% and 17.5% with stirring speed of 150 rpm and contact time for 60 minutes. The best results were obtained at the adsorbent amount of 26.5 grams (concentration of 13.25%), for which lead content reduction reached 83%. The ANOVA F was obtained to be 13.42, and hence the study concluded that the amount of the adsorbent was related to the decrease in lead content.A B S T R A KPelumas bekas adalah salah satu limbah berbahaya yang dibatasi kadar timbalnya dalam Peraturan Pemerintah, sehingga perlu penelitian untuk menurunkan kadar timbal. Tujuan penelitian ini adalah untuk memahami pengaruh penambahan adsorben untuk menurunkan kadar timbal dalam pelumas bekas yang berasal dari mesin kapal. Pelumas bekas didaur ulang dengan adsorpsi menggunakan zeolit. Setiap sampel berisi 200 mL pelumas bekas yang telah diidentifikasi sifat fisika dan kimia-nya diadsorpsi menggunakan adsorben zeolit. Variasi konsentrasi zeolit (%w/w) yang digunakan yaitu: 7,5%; 13,25%; 14,25%; 15,75% dan 17,5% dengan kecepatan pengadukan 150 rpm dan waktu kontak 60 menit. Hasil terbaik diperoleh pada jumlah adsorben 26,5 g (konsentrasi 13,25%) dengan penurunan kadar timbal mencapai 83%. Faktor F pada hasil ANOVA adalah 13,42. Dengan demikian dapat disimpulkan bahwa terdapat korelasi antara konsentrasi adsorben dan penurunan kadar timbal.

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