Sorption of Arsenic (V) by Senegalese laterites for the treatment of arsenic-contaminated mining waters

Sorption of Arsenic (V) by Senegalese laterites for the treatment of arsenic-contaminated mining waters | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Sorption of Arsenic (V) by Senegalese laterites for the treatment of arsenic-contaminated mining waters Tidiane Diop, Anne Gaudin, Thierry Lebeau This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5776559/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Arsenic contamination of water is a global issue with significant health consequences in many countries. Several treatment solutions exist, but they are often costly. In this study, the adsorption of arsenic was tested using two natural laterites from Eastern Senegal (Massawa (MASS) and Sabodala (SAB) locations). Their mineralogy consists of kaolinite (23-40%), quartz (23-39%), hematite (23-16%), and goethite (5-8%). Several conditions of arsenic adsorption by these two laterites were tested using batch experiments, including contact time, pH, and the ratio between the mass of laterite and the volume of arsenic-contaminated solution. Results indicate high removal rates of arsenic over a wide range of pH conditions (2-7, 8) for both laterites. For a laterite mass/water volume ratio of 0.1 g/50 ml, arsenic sorption reaches equilibrium within 60 minutes of contact time for MASS, whereas this time is between 60 and 120 minutes for SAB. A volume of 50 ml of arsenic-contaminated solution containing 5.69 mg/l of arsenic (V) is treated in 60 minutes with 1.5 g of both laterites. This short equilibrium time, compared to many studies reported on laterites worldwide, allows for higher water throughput, making the treatment of arsenic-contaminated water more efficient. The adsorption kinetics are slow and follow the pseudo-second-order model, suggesting the presence of chemisorption (inner-sphere adsorption) for both laterites. These results provide valuable insights into the practical suitability of Senegalese laterites for treating mine waters, particularly in the context of Senegal. Natural laterite Arsenic removal Adsorption Batch experiments mine drainage Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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Several treatment solutions exist, but they are often costly. In this study, the adsorption of arsenic was tested using two natural laterites from Eastern Senegal (Massawa (MASS) and Sabodala (SAB) locations). Their mineralogy consists of kaolinite (23-40%), quartz (23-39%), hematite (23-16%), and goethite (5-8%). Several conditions of arsenic adsorption by these two laterites were tested using batch experiments, including contact time, pH, and the ratio between the mass of laterite and the volume of arsenic-contaminated solution. Results indicate high removal rates of arsenic over a wide range of pH conditions (2-7, 8) for both laterites. For a laterite mass/water volume ratio of 0.1 g/50 ml, arsenic sorption reaches equilibrium within 60 minutes of contact time for MASS, whereas this time is between 60 and 120 minutes for SAB. A volume of 50 ml of arsenic-contaminated solution containing 5.69 mg/l of arsenic (V) is treated in 60 minutes with 1.5 g of both laterites. 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