A preocupação das populações de vários países e da comunidade científica global tem sido crescente nos últimos anos com relação às mudanças climáticas. O Aquecimento Global atinge níveis alarmantes e gera apreensão na comunidade internacional que teme danos irreversíveis ao planeta. A intensificação do Efeito Estufa em virtude da emissão excessiva de gases como o dióxido de carbono tem agravado esse cenário. Frente a esse problema, muitos pesquisadores têm dedicado seus esforços para criar tecnologias que visam neutralizar ou compensar os danos gerados pelos gases poluentes. Entre as alternativas disponíveis, o biossequestro de carbono ganhou espaço nos últimos anos, seu objetivo é utilizar organismos vivos para aprisionar o carbono atmosférico de forma a minimizar os impactos do aumento da temperatura do planeta. Esse artigo apresenta uma revisão da utilização de Escherichia coli, Microalgas e Árvores Geneticamente Modificadas, como biossequestradores potenciais de carbono atmosférico.

Chloroquine (CQN) is a persistent emerging contaminant whose environmental footprint expanded significantly following its large-scale and off-label use during the SARS-CoV-2 pandemic. Conventional water treatment systems do not effectively remove CQN, and its accumulation in aquatic environments poses risks to ecological balance and public health. This study reports, for the first time, the use of Sapucaia (Lecythis pisonis Cambess) shell powder (SPC), an underexplored agro-industrial residue native to the Amazon region and Atlantic Forest, as a biosorbent for CQN removal from aqueous solutions. Physicochemical characterisation revealed a predominantly amorphous material with a strongly negative surface and abundant carboxylic, phenolic, and hydroxyl groups, providing favourable sites for interactions with CQN. Adsorption kinetics were best described by the pseudo-second-order model (R² = 0.966), while the Weber–Morris model indicated a three-stage mass-transfer process. Isotherm analysis showed comparable fits for the Langmuir and Freundlich models, with a maximum experimental adsorption capacity of 97.26 mg g⁻¹ and a Langmuir-fitted q_max of 293.69 mg g⁻¹, both at 298 K. Post-adsorption zeta potential measurements showed a marked neutralisation of the surface charge, supporting the contribution of electrostatic attraction to CQN uptake. After four adsorption–desorption cycles at 26.05 mg L⁻¹ using water as the sole desorbent, SPC retained approximately 65% of its initial adsorption capacity, although lower retention was observed at higher adsorbate loadings. Overall, these findings highlight SPC as a low-cost and environmentally friendly biosorbent with promising potential for sustainable water treatment.

The growing presence of pharmaceutical contaminants in aquatic environments has raised global concerns, highlighting the need for sustainable and cost-effective remediation strategies. This study investigates the use of Sapucaia shell powder (SPC) as a bioadsorbent for chloroquine (CQN) removal from aqueous solutions. Physicochemical characterization revealed a surface enriched with carboxylic and phenolic groups, a predominantly amorphous structure, and a negative surface charge over a wide pH range, favoring interactions with CQN molecules. Adsorption kinetics followed a pseudo-second-order model, indicating chemisorption as the predominant mechanism, while the Weber–Morris model suggested a three-stage process involving surface adsorption, intraparticle diffusion, and equilibrium. Isotherm analysis showed excellent fits to both Langmuir and Freundlich models (R² > 0.96), with a maximum adsorption capacity of 250.09 mg g⁻¹ at 298 K, characterizing an endothermic process enhanced at higher temperatures. Reusability tests demonstrated material stability, retaining approximately 65% of its initial capacity after four adsorption–desorption cycles using only water. The results confirm that SPC is an efficient, low-cost, and environmentally friendly adsorbent for pharmaceutical removal, with potential for practical applications and scalability in wastewater treatment.