| assign_ftir_peaks | Assign FTIR peak wavenumbers to functional groups |
| baseline_correct | Baseline-correct an FTIR spectrum |
| bet_surface_area | BET surface area from multi-point gas adsorption data |
| correlation_matrix | Pairwise correlation matrix with p-values |
| find_ftir_peaks | Automatically pick peaks from a full FTIR spectrum |
| fit_confint | Confidence intervals for a fitted isotherm, kinetics, or van't Hoff model |
| fit_dr | Fit the Dubinin-Radushkevich (D-R) adsorption isotherm |
| fit_elovich | Fit the Elovich kinetics model |
| fit_freundlich | Fit the Freundlich adsorption isotherm |
| fit_intraparticle | Fit the intraparticle diffusion (Weber-Morris) kinetics model |
| fit_isotherm_batch | Fit an adsorption isotherm separately for each group in a data frame |
| fit_kinetics_batch | Fit adsorption kinetics separately for each group in a data frame |
| fit_langmuir | Fit the Langmuir adsorption isotherm |
| fit_pfo | Fit pseudo-first-order adsorption kinetics |
| fit_pso | Fits 'qt = (k2 * qe^2 * t) / (1 + k2 * qe * t)' by nonlinear least squares. |
| fit_sips | Fit the Sips (Langmuir-Freundlich) adsorption isotherm |
| fit_temkin | Fit the Temkin adsorption isotherm |
| fit_vant_hoff | Van't Hoff thermodynamic analysis of adsorption |
| ftir_band_reference | Reference table of common FTIR functional-group band assignments |
| functional_group_density | Functional group density from a full FTIR spectrum |
| parse_sbc_id | Parse structured biochar sample identifiers |
| pct_mass_change | Percentage mass loss between two mass measurements |
| plot_ftir_spectrum | Plot an FTIR spectrum |
| plot_isotherm | Plot an adsorption isotherm fit |
| plot_kinetics | Plot a kinetics fit |
| proximate_analysis | Proximate analysis summary (moisture, volatile matter, ash, fixed carbon) |
| qe_batch | Batch adsorption capacity (qe) |
| read_ftir_txt | Read a two-column FTIR spectrum export |
| read_xrd_txt | Read a two-column XRD pattern export |
| removal_efficiency | Percentage removal efficiency |
| save_tiff | Save a base-graphics plot as a 600 dpi TIFF |
| sbc_example | Synthetic example biochar dataset |
| ultimate_ratios | Atomic ratios from ultimate (CHNS) elemental analysis |
| xrd_crystallinity_index | Peak-area crystallinity index from an XRD pattern |
| xrd_deconvolve | Simplified multi-Gaussian XRD peak deconvolution |