Chloramphenicol is a broad-spectrum bacterial antibiotic used against conjunctivitis, meningitis, plague, cholera, and typhoid fever. As a consequence, chloramphenicol ends up polluting the aquatic environment, wastewater treatment plants, and hospital wastewaters, thus disrupting ecosystems and inducing microbial resistance. Here, we review the occurrence, toxicity, and removal of chloramphenicol with emphasis on adsorption techniques. We present the adsorption performance of adsorbents such as biochar, activated carbon, porous carbon, metal–organic framework, composites, zeolites, minerals, molecularly imprinted polymers, and multi-walled carbon nanotubes. The effect of dose, pH, temperature, initial concentration, and contact time is discussed. Adsorption is controlled by π–π interactions, donor–acceptor interactions, hydrogen bonding, and electrostatic interactions. We also discuss isotherms, kinetics, thermodynamic data, selection of eluents, desorption efficiency, and regeneration of adsorbents. Porous carbon-based adsorbents exhibit excellent adsorption capacities of 500–1240 mg g −1 . Most adsorbents can be reused over at least four cycles.

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Because many engineered nanoparticles are toxic, there is a need for methods to fabricate safe nanoparticles such as plant-based nanoparticles. Indeed, plant extracts contain flavonoids, amino acids, proteins, polysaccharides, enzymes, polyphenols, steroids, and reducing sugars that facilitate the reduction, formation, and stabilization of nanoparticles. Moreover, synthesizing nanoparticles from plant extracts is fast, safe, and cost-effective because it does not consume much energy, and non-toxic derivatives are generated. These nanoparticles have diverse and unique properties of interest for applications in many fields. Here, we review the synthesis of metal/metal oxide nanoparticles with plant extracts. These nanoparticles display antibacterial, antifungal, anticancer, and antioxidant properties. Plant-based nanoparticles are also useful for medical diagnosis and drug delivery.

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is an MA/Ph.D. student in Anthropology/Civil Engineering, who completed his Master of Science in Biochemistry at Iowa State University and his Bachelor of Science in Chemistry at Hartwick College. His first master's thesis focused on the structural analysis of the schizophrenic gene DISC1 using transmission electron microscopy and hydrogen-deuterium exchange mass spectrometry. For his second master's thesis, he focuses on identifying the individual and institutional factors that contribute to a "culture of disengagement" from the ethical dimension of engineering work among students in the engineering profession. His Ph.D. project is funded by the NSF and is concerned with promoting and improving engineering students' ethical behavior and sensitivity through on-campus student organizations. His academic interests include mental health, international development, human rights, and engineering ethics. Currently, his ambition is to work within an international organization such as UNESCO and to be an advocate for promoting science and technology as critical tools of sustainable development as well as to participate in the dialogue between scientists, policy-makers, and society. Luan enjoys traveling, reading, and watching documentaries.

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