{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T16:42:04Z","timestamp":1777653724046,"version":"3.51.4"},"reference-count":56,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2022,10,3]],"date-time":"2022-10-03T00:00:00Z","timestamp":1664755200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"RD Units CIQUP","award":["UIDB\/000081\/2020"],"award-info":[{"award-number":["UIDB\/000081\/2020"]}]},{"name":"RD Units CIQUP","award":["LA\/P\/0056\/2020"],"award-info":[{"award-number":["LA\/P\/0056\/2020"]}]},{"name":"Associated Laboratory IMS","award":["UIDB\/000081\/2020"],"award-info":[{"award-number":["UIDB\/000081\/2020"]}]},{"name":"Associated Laboratory IMS","award":["LA\/P\/0056\/2020"],"award-info":[{"award-number":["LA\/P\/0056\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Separations"],"abstract":"<jats:p>In the present work, the adsorption behavior of Eriochrome Black T (EBT) on waste hemp activated carbon (WHAC) was examined. The surface of the WHAC was modified by H3PO4 acid treatment. The surface and structural characterization of the adsorbents was carried out using Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) analysis. The effect of influential adsorption parameters (pH, contact time, dosage, and initial concentration) on the adsorption of EBT onto WHAC was examined in batch experiments; some adsorption parameters such as pH, concentration and dose were improved by new mathematical models. The adsorption behavior of EBT on the surfaces of WHAC was evaluated by applying different isotherm models (Langmuir, Freundlich, Temkin and Dubinin\u2013Radushkevich) to equilibrium data. The adsorption kinetics was studied by using pseudo-first-order, pseudo-second-order, Elovich and intraparticle models on the model. Adsorption followed the pseudo-second-order rate kinetics. The maximum removal of EBT was found to be 44\u201362.08% by WHAC at pH = 7, adsorbent dose of 10\u201370 mg, contact time of 3 h and initial dye concentration of 10 mg.L\u22121. The maximum adsorption capacities were 14.025 mg.g\u22121 obtained by calculating according to the Langmuir model, while the maximum removal efficiency was obtained at 70 mg equal to 62.08% for the WHAC. The adsorption process is physical in the monolayer and multilayer.<\/jats:p>","DOI":"10.3390\/separations9100283","type":"journal-article","created":{"date-parts":[[2022,10,10]],"date-time":"2022-10-10T05:12:21Z","timestamp":1665378741000},"page":"283","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Efficient Removal of Eriochrome Black T Dye Using Activated Carbon of Waste Hemp (Cannabis sativa L.) Grown in Northern Morocco Enhanced by New Mathematical Models"],"prefix":"10.3390","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8112-1474","authenticated-orcid":false,"given":"Fouad","family":"El Mansouri","sequence":"first","affiliation":[{"name":"Research Team: Materials, Environment and Sustainable Development (MEDD), Faculty of Sciences and Techniques of Tangier, BP 416, Tangier 90000, Morocco"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0577-0069","authenticated-orcid":false,"given":"Guillermo","family":"Pelaz","sequence":"additional","affiliation":[{"name":"Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute, University of Le\u00f3n, 24071 Le\u00f3n, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5915-1370","authenticated-orcid":false,"given":"Antonio","family":"Mor\u00e1n","sequence":"additional","affiliation":[{"name":"Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute, University of Le\u00f3n, 24071 Le\u00f3n, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8478-3441","authenticated-orcid":false,"given":"Joaquim C. G. Esteves","family":"Da Silva","sequence":"additional","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o Em Qu\u00edmica (CIQUP), Instituto De Ci\u00eancias Moleculares (IMS), Departamento De Geoci\u00eancias, Ambiente e Ordenamento Do Territ\u00f3rio, Faculdade De Ci\u00eancias, Universidade Do Porto, Rua Do Campo Alegre S\/N, 4169-007 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1296-7633","authenticated-orcid":false,"given":"Francesco","family":"Cacciola","sequence":"additional","affiliation":[{"name":"Department of Biomedical, Dental, Morphological and Functional Imaging Sciences, University of Messina, 98125 Messina, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0360-8161","authenticated-orcid":false,"given":"Hammadi","family":"El Farissi","sequence":"additional","affiliation":[{"name":"Laboratory of Environment and Applied Chemistry of the Natural Resources and Processes, Department of Chemistry, Faculty of Sciences, Mohamed First University, BP 524, Oujda 60000, Morocco"}]},{"given":"Hatim","family":"Tayeq","sequence":"additional","affiliation":[{"name":"MAE2D Laboratory, Polydisciplinary Faculty of Larache, Abdelmalek Essaadi University, Tetouan 93020, Morocco"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4098-4350","authenticated-orcid":false,"given":"Mohammed Hassani","family":"Zerrouk","sequence":"additional","affiliation":[{"name":"Environmental Technologies, Biotechnology and Valorisation of Bio-Resources Team, TEBVB, FSTH, Abdelmalek Essaadi University, Tetouan 93020, Morocco"}]},{"given":"Jamal","family":"Brigui","sequence":"additional","affiliation":[{"name":"Research Team: Materials, Environment and Sustainable Development (MEDD), Faculty of Sciences and Techniques of Tangier, BP 416, Tangier 90000, Morocco"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Farinon, B., Molinari, R., Costantini, L., and Merendino, N. 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